ANSYS CFX Tutorials

610 Pages·2009·4.14 MB·English

ANSYS CFX Tutorials
Draft Draft
ANSYS CFX Tutorials
2
Draft Draft
Table of Contents
1. Introduction to the CFX Tutorials...................................................................................................... 23
Preparing a Working Directory............................................................................................. 23
Setting the Working Directory and Starting ANSYS CFX.......................................................... 23
Playing a Tutorial Session File.............................................................................................. 24
Changing the Display Colors................................................................................................ 24
Editor Buttons................................................................................................................... 24
Using Help ....................................................................................................................... 25
2. Simulating Flow in a Static Mixer Using CFX in Standalone Mode.......................................................... 27
Tutorial Features................................................................................................................ 27
Overview of the Problem to Solve......................................................................................... 28
Before You Begin............................................................................................................... 28
Starting CFX-Pre ............................................................................................................... 28
Defining a Case in CFX-Pre................................................................................................. 29
Synopsis of Quick Setup Mode............................................................................................. 30
Workflow Overview ........................................................................................................... 30
Creating a New Case .......................................................................................................... 30
Setting the Physics Definition............................................................................................... 30
Importing a Mesh............................................................................................................... 31
Using the Viewer ............................................................................................................... 31
Defining Model Data.......................................................................................................... 32
Defining Boundaries........................................................................................................... 32
Setting Boundary Data........................................................................................................ 33
Setting Flow Specification................................................................................................... 33
Setting Temperature Specification......................................................................................... 33
Reviewing the Boundary Condition Definitions....................................................................... 33
Creating the Second Inlet Boundary Definition........................................................................ 33
Creating the Outlet Boundary Definition................................................................................ 34
Moving to General Mode..................................................................................................... 34
Setting Solver Control......................................................................................................... 34
Writing the CFX-Solver Input (.def) File................................................................................ 35
Playing the Session File and Starting CFX-Solver Manager........................................................ 35
Obtaining a Solution Using CFX-Solver Manager.................................................................... 35
Start the Run..................................................................................................................... 36
Move from CFX-Solver to CFD-Post..................................................................................... 37
Viewing the Results in CFD-Post.......................................................................................... 37
Workflow Overview ........................................................................................................... 38
Setting the Edge Angle for a Wireframe Object........................................................................ 38
Creating a Point for the Origin of the Streamline...................................................................... 39
Creating a Streamline Originating from a Point........................................................................ 40
Rearranging the Point ......................................................................................................... 41
Configuring a Default Legend.............................................................................................. 42
Creating a Slice Plane......................................................................................................... 43
Defining Slice Plane Geometry............................................................................................. 43
Configuring Slice Plane Views.............................................................................................. 44
Rendering Slice Planes........................................................................................................ 44
Coloring the Slice Plane...................................................................................................... 45
Moving the Slice Plane ....................................................................................................... 46
Adding Contours ............................................................................................................... 46
Working with Animations.................................................................................................... 47
Showing the Animation Dialog Box....................................................................................... 48
Creating the First Keyframe................................................................................................. 48
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Creating the Second Keyframe ............................................................................................. 49
Viewing the Animation ....................................................................................................... 51
Modifying the Animation .................................................................................................... 52
Saving a Movie.................................................................................................................. 53
Quitting CFD-Post ............................................................................................................. 53
3. Simulating Flow in a Static Mixer Using Workbench............................................................................. 55
Tutorial Features................................................................................................................ 55
Overview of the Problem to Solve......................................................................................... 56
Before You Begin............................................................................................................... 56
Starting ANSYS Workbench ................................................................................................ 56
Starting CFX-Pre from ANSYS Workbench............................................................................ 57
Creating the Simulation Definition........................................................................................ 58
Setting the Physics Definition............................................................................................... 58
Defining Boundaries........................................................................................................... 58
Setting Boundary Data........................................................................................................ 58
Creating the Second Inlet Boundary Definition........................................................................ 59
Creating the Outlet Boundary Definition................................................................................ 59
Moving to General Mode..................................................................................................... 59
Using the Viewer ............................................................................................................... 60
Setting Solver Control......................................................................................................... 60
Refresh the Project............................................................................................................. 61
Obtaining a Solution........................................................................................................... 61
Display the Results in CFD-Post........................................................................................... 63
Viewing the Results in CFD-Post.......................................................................................... 63
Workflow Overview ........................................................................................................... 64
Setting the Edge Angle for a Wireframe Object........................................................................ 65
Creating a Point for the Origin of the Streamline...................................................................... 66
Creating a Streamline Originating from a Point........................................................................ 67
Rearranging the Point ......................................................................................................... 68
Configuring a Default Legend.............................................................................................. 69
Creating a Slice Plane......................................................................................................... 70
Defining Slice Plane Geometry............................................................................................. 70
Configuring Slice Plane Views.............................................................................................. 71
Rendering Slice Planes........................................................................................................ 72
Coloring the Slice Plane...................................................................................................... 73
Moving the Slice Plane ....................................................................................................... 73
Adding Contours ............................................................................................................... 73
Working with Animations.................................................................................................... 75
Showing the Animation Dialog Box....................................................................................... 76
Creating the First Keyframe................................................................................................. 76
Creating the Second Keyframe ............................................................................................. 77
Viewing the Animation ....................................................................................................... 79
Modifying the Animation .................................................................................................... 80
Saving a Movie.................................................................................................................. 81
Closing the Applications...................................................................................................... 81
4. Flow in a Static Mixer (Refined Mesh)............................................................................................... 83
Tutorial Features................................................................................................................ 83
Overview of the Problem to Solve......................................................................................... 84
Before You Begin............................................................................................................... 84
Starting CFX-Pre ............................................................................................................... 84
Defining a Simulation using General Mode in CFX-Pre............................................................. 84
Workflow Overview ........................................................................................................... 84
Creating a New Case .......................................................................................................... 85
Importing a Mesh............................................................................................................... 85
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Importing CCL.................................................................................................................. 86
Viewing Domain Settings.................................................................................................... 86
Viewing the Boundary Condition Setting................................................................................ 87
Defining Solver Parameters.................................................................................................. 87
Writing the CFX-Solver Input (.def) File................................................................................ 88
Playing the Session File and Starting CFX-Solver Manager........................................................ 88
Obtaining a Solution with CFX-Solver................................................................................... 89
Workflow Overview ........................................................................................................... 89
Starting the Run with an Initial Values File.............................................................................. 90
Confirming Results ............................................................................................................ 90
Moving from CFX-Solver to CFD-Post.................................................................................. 90
Viewing the Results in CFD-Post.......................................................................................... 91
Creating a Slice Plane......................................................................................................... 91
Coloring the Slice Plane...................................................................................................... 92
Loading Results from Tutorial 1 for Comparison...................................................................... 92
Creating a Second Slice Plane.............................................................................................. 93
Comparing Slice Planes using Multiple Views......................................................................... 93
Viewing the Surface Mesh on the Outlet................................................................................. 94
Looking at the Inflated Elements in Three Dimensions.............................................................. 95
Viewing the Surface Mesh on the Mixer Body......................................................................... 96
Viewing the Layers of Inflated Elements on a Plane.................................................................. 96
Viewing the Mesh Statistics................................................................................................. 96
Viewing the Mesh Elements with Largest Face Angle................................................................ 97
Viewing the Mesh Elements with Largest Face Angle Using a Point............................................. 97
Quitting CFD-Post ............................................................................................................. 98
5. Flow in a Process Injection Mixing Pipe.............................................................................................. 99
Tutorial Features................................................................................................................ 99
Overview of the Problem to Solve....................................................................................... 100
Before You Begin............................................................................................................. 101
Starting CFX-Pre ............................................................................................................. 101
Defining a Simulation using General Mode in CFX-Pre........................................................... 101
Workflow Overview.......................................................................................................... 101
Creating a New Case......................................................................................................... 102
Importing a Mesh............................................................................................................. 102
Setting Temperature-Dependent Material Properties................................................................ 103
Plotting an Expression....................................................................................................... 104
Evaluating an Expression................................................................................................... 104
Modify Material Properties ................................................................................................ 104
Creating the Domain......................................................................................................... 105
Creating the Side Inlet Boundary......................................................................................... 105
Creating the Main Inlet Boundary........................................................................................ 106
Creating the Main Outlet Boundary..................................................................................... 107
Setting Initial Values......................................................................................................... 107
Setting Solver Control....................................................................................................... 107
Writing the CFX-Solver Input (.def) File.............................................................................. 108
Obtaining a Solution Using CFX-Solver Manager.................................................................. 108
Moving from CFX-Solver Manager to CFD-Post.................................................................... 109
Viewing the Results in CFD-Post........................................................................................ 109
Workflow Overview.......................................................................................................... 109
Modifying the Outline of the Geometry................................................................................ 109
Creating and Modifying Streamlines Originating from the Main Inlet......................................... 109
Modifying Streamline Color Ranges.................................................................................... 110
Coloring Streamlines with a Constant Color.......................................................................... 110
Creating Streamlines Originating from the Side Inlet............................................................... 111
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Examining Turbulence Kinetic Energy ................................................................................. 111
Exiting CFD-Post............................................................................................................. 112
6. Flow from a Circular Vent............................................................................................................... 113
Tutorial Features .............................................................................................................. 113
Overview of the Problem to Solve....................................................................................... 114
Before You Begin............................................................................................................. 114
Starting CFX-Pre ............................................................................................................. 115
Defining a Multiple-Analysis Simulation in CFX-Pre.............................................................. 115
Importing the Mesh .......................................................................................................... 115
Creating an Additional Variable........................................................................................... 116
Renaming the Analysis...................................................................................................... 116
Creating the Domain......................................................................................................... 116
Creating the Boundaries .................................................................................................... 117
Setting Initial Values......................................................................................................... 119
Setting Solver Control....................................................................................................... 119
Creating a Transient Flow Analysis...................................................................................... 120
Modifying the Analysis Type.............................................................................................. 120
Modifying the Boundary Conditions.................................................................................... 120
Initialization Values .......................................................................................................... 122
Modifying the Solver Control............................................................................................. 122
Output Control................................................................................................................. 123
Configuring Simulation Control.......................................................................................... 124
Writing the CFX-Solver Input File....................................................................................... 125
Obtaining Solutions to the Steady-State and Transient Configurations........................................ 125
Viewing the Results in CFD-Post........................................................................................ 126
Displaying Smoke Density Using an Isosurface...................................................................... 126
Viewing the Results at Different Time Steps.......................................................................... 127
Generating Titled Image Files............................................................................................. 127
Generating a Movie .......................................................................................................... 128
7. Flow Around a Blunt Body............................................................................................................. 131
Tutorial Features .............................................................................................................. 131
Overview of the Problem to Solve....................................................................................... 132
Before You Begin............................................................................................................. 132
Starting CFX-Pre ............................................................................................................. 133
Defining a Case in CFX-Pre............................................................................................... 133
Importing the Mesh .......................................................................................................... 133
Creating the Domain......................................................................................................... 133
Creating Composite Regions .............................................................................................. 134
Creating the Boundaries .................................................................................................... 135
Setting Initial Values......................................................................................................... 137
Setting Solver Control....................................................................................................... 137
Writing the CFX-Solver Input (.def) File.............................................................................. 137
Obtaining a Solution Using CFX-Solver Manager.................................................................. 138
Obtaining a Solution in Serial............................................................................................. 138
Obtaining a Solution in Parallel........................................................................................... 138
Viewing the Results in CFD-Post........................................................................................ 142
Using Symmetry Plane to Display the Full Geometry.............................................................. 142
Creating Velocity Vectors................................................................................................... 143
Displaying Pressure Distribution on Body and Symmetry Plane................................................ 145
Creating Surface Streamlines to Display the Path of Air along the Surface of the Body.................. 145
Moving Objects ............................................................................................................... 146
Creating a Surface Plot of y+.............................................................................................. 146
Demonstrating Power Syntax.............................................................................................. 147
Viewing the Mesh Partitions (Parallel Only).......................................................................... 148
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8. Buoyant Flow in a Partitioned Cavity................................................................................................ 149
Tutorial Features .............................................................................................................. 149
Overview of the Problem to Solve....................................................................................... 150
Before You Begin............................................................................................................. 150
Starting CFX-Pre ............................................................................................................. 151
Defining a Case in CFX-Pre............................................................................................... 151
Importing the Mesh .......................................................................................................... 151
Analysis Type.................................................................................................................. 152
Creating the Domain......................................................................................................... 153
Creating the Boundaries .................................................................................................... 154
Setting Initial Values......................................................................................................... 155
Setting Output Control ...................................................................................................... 155
Setting Solver Control....................................................................................................... 156
Writing the CFX-Solver Input (.def) File.............................................................................. 156
Obtaining a Solution using CFX-Solver Manager................................................................... 157
Viewing the Results in CFD-Post........................................................................................ 157
Simple Report ................................................................................................................. 157
Plots for Customized Reports ............................................................................................. 157
Customized Report........................................................................................................... 160
Animations ..................................................................................................................... 160
Completion ..................................................................................................................... 160
9. Free Surface Flow Over a Bump...................................................................................................... 161
Tutorial Features .............................................................................................................. 161
Overview of the Problem to Solve....................................................................................... 162
Approach to the Problem................................................................................................... 162
Before You Begin............................................................................................................. 162
Starting CFX-Pre ............................................................................................................. 162
Defining a Simulation in CFX-Pre....................................................................................... 163
Importing the Mesh .......................................................................................................... 163
Creating Expressions for Initial and Boundary Conditions........................................................ 164
Creating the Domain......................................................................................................... 165
Creating the Boundaries .................................................................................................... 166
Setting Initial Values......................................................................................................... 168
Setting Mesh Adaption Parameters ...................................................................................... 169
Setting the Solver Controls................................................................................................. 170
Writing the CFX-Solver Input (.def) File.............................................................................. 170
Obtaining a Solution using CFX-Solver Manager................................................................... 171
Viewing the Results in CFD-Post........................................................................................ 172
Creating Velocity Vector Plots............................................................................................. 172
Viewing Mesh Refinement................................................................................................. 173
Creating an Isosurface to Show the Free Surface.................................................................... 176
Creating a Polyline that Follows the Free Surface................................................................... 176
Creating a Chart to Show the Height of the Surface................................................................. 176
Further Postprocessing ...................................................................................................... 177
Using a Supercritical Outlet Condition................................................................................. 177
10. Supersonic Flow Over a Wing........................................................................................................ 179
Tutorial Features .............................................................................................................. 179
Overview of the Problem to Solve....................................................................................... 180
Approach to the Problem................................................................................................... 180
Before You Begin............................................................................................................. 180
Starting CFX-Pre ............................................................................................................. 180
Defining a Case in CFX-Pre............................................................................................... 181
Importing the Mesh .......................................................................................................... 181
Creating the Domain......................................................................................................... 181
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Creating the Boundaries .................................................................................................... 182
Creating Domain Interfaces................................................................................................ 184
Setting Initial Values......................................................................................................... 184
Setting the Solver Controls................................................................................................. 185
Writing the CFX-Solver Input (.def) File.............................................................................. 185
Obtaining a Solution Using CFX-Solver Manager.................................................................. 186
Viewing the Results in CFD-Post........................................................................................ 186
Displaying Mach Information............................................................................................. 186
Displaying Pressure Information ......................................................................................... 186
Displaying Temperature Information.................................................................................... 187
Displaying Pressure With User Vectors................................................................................. 187
11. Flow Through a Butterfly Valve..................................................................................................... 189
Tutorial Features .............................................................................................................. 189
Overview of the Problem to Solve....................................................................................... 190
Approach to the Problem................................................................................................... 191
Before You Begin............................................................................................................. 191
Starting CFX-Pre ............................................................................................................. 191
Defining a Simulation in CFX-Pre....................................................................................... 191
Creating a New Case......................................................................................................... 191
Importing the Mesh .......................................................................................................... 192
Defining the Properties of the Sand...................................................................................... 192
Creating the Domain......................................................................................................... 193
Creating the Inlet Velocity Profile........................................................................................ 195
Creating the Boundary Conditions....................................................................................... 196
Setting Initial Values......................................................................................................... 200
Setting the Solver Controls................................................................................................. 200
Writing the CFX-Solver Input (.def) File.............................................................................. 201
Obtaining a Solution Using CFX-Solver Manager.................................................................. 201
Viewing the Results in CFD-Post........................................................................................ 201
Erosion Due to Sand Particles............................................................................................. 202
Displaying Erosion on the Pipe Wall.................................................................................... 202
Setting the Particle Tracks.................................................................................................. 203
Creating the Particle Track Symbols..................................................................................... 203
Creating a Particle Track Animation..................................................................................... 203
Determining Minimum, Maximum, and Average Pressure Values.............................................. 204
12. Flow in a Catalytic Converter........................................................................................................ 207
Tutorial Features .............................................................................................................. 207
Overview of the Problem to Solve....................................................................................... 208
Approach to the Problem................................................................................................... 209
Before You Begin............................................................................................................. 209
Starting CFX-Pre ............................................................................................................. 209
Defining a Case in CFX-Pre............................................................................................... 209
Importing the Meshes........................................................................................................ 209
Creating the Fluid Domain................................................................................................. 212
Creating the Porous Domain............................................................................................... 212
Creating the Boundaries .................................................................................................... 213
Creating the Domain Interfaces........................................................................................... 214
Setting Initial Values......................................................................................................... 215
Setting Solver Control....................................................................................................... 215
Setting a Discretization Option ........................................................................................... 216
Writing the CFX-Solver Input (.def) File.............................................................................. 216
Obtaining a Solution using CFX-Solver Manager................................................................... 217
Viewing the Results in CFD-Post........................................................................................ 217
Viewing the Mesh on a GGI Interface................................................................................... 217
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Creating User Locations .................................................................................................... 218
Creating Plots.................................................................................................................. 219
Exporting Polyline Data .................................................................................................... 221
13. Non-Newtonian Fluid Flow in an Annulus........................................................................................ 223
Tutorial Features .............................................................................................................. 223
Background Theory .......................................................................................................... 224
Overview of the Problem to Solve....................................................................................... 225
Before You Begin............................................................................................................. 225
Starting CFX-Pre ............................................................................................................. 226
Defining a Case in CFX-Pre............................................................................................... 226
Importing the Mesh .......................................................................................................... 226
Creating the Fluid............................................................................................................. 226
Creating the Domain......................................................................................................... 228
Creating the Boundaries .................................................................................................... 228
Setting Initial Values......................................................................................................... 229
Setting Solver Control....................................................................................................... 230
Writing the CFX-Solver Input (.def) File.............................................................................. 230
Obtaining a Solution using CFX-Solver Manager................................................................... 231
Viewing the Results in CFD-Post........................................................................................ 231
14. Flow in an Axial Rotor/Stator........................................................................................................ 235
Tutorial Features .............................................................................................................. 235
Overview of the Problem to Solve....................................................................................... 236
Before You Begin............................................................................................................. 238
Starting CFX-Pre ............................................................................................................. 238
Defining a Frozen Rotor Case in CFX-Pre............................................................................. 239
Basic Settings.................................................................................................................. 239
Component Definition....................................................................................................... 239
Physics Definition ............................................................................................................ 240
Interface Definition .......................................................................................................... 241
Boundary Definition ......................................................................................................... 241
Final Operations............................................................................................................... 241
Writing the CFX-Solver Input (.def) File.............................................................................. 241
Obtaining a Solution to the Frozen Rotor Model..................................................................... 242
Obtaining a Solution in Serial............................................................................................. 242
Obtaining a Solution With Local Parallel.............................................................................. 242
Obtaining a Solution with Distributed Parallel........................................................................ 242
Viewing the Frozen Rotor Results in CFD-Post...................................................................... 243
Initializing Turbo-Post....................................................................................................... 243
Viewing Three Domain Passages......................................................................................... 243
Blade Loading Turbo Chart................................................................................................ 244
Setting up a Transient Rotor-Stator Calculation...................................................................... 244
Playing a Session File....................................................................................................... 244
Opening the Existing Case................................................................................................. 245
Modifying the Physics Definition........................................................................................ 245
Setting Output Control ...................................................................................................... 246
Modifying Execution Control ............................................................................................. 246
Writing the CFX-Solver Input (.def) File.............................................................................. 247
Obtaining a Solution to the Transient Rotor-Stator Model......................................................... 247
Serial Solution................................................................................................................. 247
Parallel Solution............................................................................................................... 247
Monitoring the Run .......................................................................................................... 248
Viewing the Transient Rotor-Stator Results in CFD-Post.......................................................... 248
Initializing Turbo-Post....................................................................................................... 248
Displaying a Surface of Constant Span................................................................................. 248
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Using Multiple Turbo Viewports.......................................................................................... 248
Creating a Turbo Surface at Mid-Span.................................................................................. 248
Setting up Instancing Transformations.................................................................................. 249
Animating the movement of the Rotor relative to the Stator...................................................... 249
Further Postprocessing ...................................................................................................... 250
15. Reacting Flow in a Mixing Tube..................................................................................................... 251
Tutorial Features .............................................................................................................. 251
Overview of the Problem to Solve....................................................................................... 252
Modeling Approach .......................................................................................................... 254
Before You Begin............................................................................................................. 254
Starting CFX-Pre ............................................................................................................. 254
Defining a Case in CFX-Pre............................................................................................... 255
Importing the Mesh .......................................................................................................... 255
Creating a Multicomponent Fluid........................................................................................ 255
Creating an Additional Variable to Model pH......................................................................... 259
Formulating the Reaction and pH as Expressions.................................................................... 259
Creating the Domain......................................................................................................... 264
Creating a Subdomain to Model the Chemical Reactions.......................................................... 266
Creating the Boundary Conditions....................................................................................... 267
Setting Initial Values......................................................................................................... 270
Setting Solver Control....................................................................................................... 270
Writing the CFX-Solver Input (.def) File.............................................................................. 271
Obtaining a Solution using CFX-Solver Manager................................................................... 271
Viewing the Results in CFD-Post........................................................................................ 271
16. Conjugate Heat Transfer in a Heating Coil....................................................................................... 273
Tutorial Features .............................................................................................................. 273
Overview of the Problem to Solve....................................................................................... 274
Before You Begin............................................................................................................. 275
Starting CFX-Pre ............................................................................................................. 275
Defining a Case in CFX-Pre............................................................................................... 275
Importing the Mesh .......................................................................................................... 275
Editing the Material Properties............................................................................................ 276
Defining the Calcium Carbonate Deposit Material.................................................................. 276
Creating the Domains........................................................................................................ 277
Creating the Boundaries .................................................................................................... 278
Creating the Domain Interface............................................................................................ 279
Setting Solver Control....................................................................................................... 280
Writing the CFX-Solver Input (.def) File.............................................................................. 280
Obtaining a Solution using CFX-Solver Manager................................................................... 281
Viewing the Results in CFD-Post........................................................................................ 281
Heating Coil Temperature Range......................................................................................... 281
Creating a Cylindrical Locator............................................................................................ 282
Specular Lighting............................................................................................................. 284
Moving the Light Source................................................................................................... 284
Exporting the Results to ANSYS......................................................................................... 284
Exporting Data from CFX-Solver Manager........................................................................... 284
17. Multiphase Flow in a Mixing Vessel................................................................................................ 287
Tutorial Features .............................................................................................................. 287
Overview of the Problem to Solve....................................................................................... 288
Before You Begin............................................................................................................. 289
Starting CFX-Pre ............................................................................................................. 289
Defining a Case in CFX-Pre............................................................................................... 290
Importing the Meshes........................................................................................................ 290
Creating the Domains........................................................................................................ 292
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