ANSYS TurboGrid Tutorials - Portal de Documentacion de software

124 Pages·2013·2.56 MB·English

ANSYS TurboGrid Tutorials
ANSYS, Inc. Release 15.0
Southpointe November 2013
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Table of Contents
1. Introduction to the ANSYS TurboGrid Tutorials...................................................................................... 1
1.1. Preparing a Working Directory.......................................................................................................... 1
1.2. Setting the Working Directory and Starting ANSYS TurboGrid............................................................ 1
1.3. Changing the Display Colors............................................................................................................. 2
1.4. Editor Buttons .................................................................................................................................. 2
1.5. Using Help........................................................................................................................................ 2
2. Rotor 37................................................................................................................................................... 3
2.1. Overview of the Mesh Creation Process............................................................................................. 4
2.2. Before You Begin.............................................................................................................................. 5
2.3. Starting ANSYS TurboGrid................................................................................................................. 5
2.4. Defining the Geometry..................................................................................................................... 5
2.5. Defining the Topology...................................................................................................................... 7
2.6. Reviewing the Mesh Data Settings.................................................................................................... 8
2.7. Reviewing the Mesh Quality on the Hub and Shroud Tip Layers......................................................... 8
2.8. Generating the Mesh........................................................................................................................ 9
2.9. Looking at Mesh Data Values............................................................................................................. 9
2.10. Analyzing the Mesh Quality............................................................................................................. 9
2.11.Visualizing the Hub-to-Shroud Element Distribution...................................................................... 10
2.12. Observing the Shroud Tip Mesh.................................................................................................... 12
2.13. Examining the Mesh Qualitatively................................................................................................. 12
2.14. Creating a Legend......................................................................................................................... 13
2.15. Saving the Mesh........................................................................................................................... 14
2.16. Saving the State (Optional)............................................................................................................ 14
3. Steam Stator.......................................................................................................................................... 15
3.1. Before You Begin............................................................................................................................. 16
3.2. Starting ANSYS TurboGrid............................................................................................................... 16
3.3. Defining the Geometry................................................................................................................... 16
3.3.1. Loading the Curves................................................................................................................ 17
3.3.2. Setting the Curve Type........................................................................................................... 18
3.4. Defining the Topology.................................................................................................................... 19
3.5. Reviewing the Mesh Data Settings.................................................................................................. 19
3.6. Reviewing the Mesh Quality on the Hub and Shroud Layers............................................................. 20
3.7. Generating the Mesh...................................................................................................................... 20
3.8. Analyzing the Mesh........................................................................................................................ 20
3.8.1. Examining the Mesh Qualitatively........................................................................................... 21
3.8.1.1. Editing a Turbo Surface.................................................................................................. 21
3.8.1.2. Creating a Legend......................................................................................................... 22
3.9. Saving the Mesh............................................................................................................................. 22
3.10. Saving the State (Optional)............................................................................................................ 22
4. Radial Compressor................................................................................................................................ 23
4.1. Before You Begin............................................................................................................................. 24
4.2. Starting ANSYS TurboGrid............................................................................................................... 24
4.3. Defining the Geometry................................................................................................................... 25
4.3.1. Defining the Machine Data..................................................................................................... 25
4.3.2. Defining the Hub................................................................................................................... 25
4.3.3. Defining the Shroud............................................................................................................... 26
4.3.4. Defining the Blade................................................................................................................. 26
4.3.5. Defining the Splitter Blade...................................................................................................... 28
4.4. Defining the Topology.................................................................................................................... 28
4.5. Reviewing the Mesh Data Settings.................................................................................................. 28
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4.6. Generating the Mesh...................................................................................................................... 30
4.7. Analyzing the Mesh........................................................................................................................ 30
4.8. Saving the Mesh............................................................................................................................. 31
4.9. Saving the State (Optional)............................................................................................................. 31
5. Axial Fan Using ATM Optimized Topology............................................................................................ 33
5.1. Before You Begin............................................................................................................................. 34
5.2. Starting ANSYS TurboGrid............................................................................................................... 34
5.3. Defining the Geometry................................................................................................................... 34
5.4. Defining the Topology.................................................................................................................... 36
5.5. Increasing the Mesh Density........................................................................................................... 37
5.6. Generating the Mesh...................................................................................................................... 38
5.7. Using the Locking Feature............................................................................................................... 39
5.8.The Y+ Functionality....................................................................................................................... 39
5.9. Using Local Mesh Refinement......................................................................................................... 40
5.10. Analyzing the Mesh...................................................................................................................... 41
5.11. Adding Inlet and Outlet Domains.................................................................................................. 42
5.12. Analyzing the New Mesh............................................................................................................... 42
5.13. Saving the Mesh........................................................................................................................... 42
5.14. Saving the State (Optional)............................................................................................................ 42
6. Axial Fan Using Traditional Topology................................................................................................... 43
6.1. Before You Begin............................................................................................................................. 44
6.2. Starting ANSYS TurboGrid............................................................................................................... 44
6.3. Defining the Geometry................................................................................................................... 44
6.4. Defining the Topology.................................................................................................................... 47
6.5. Reviewing the Mesh Data Settings.................................................................................................. 48
6.6. Reviewing the Mesh Quality on the Hub and Shroud Tip Layers....................................................... 48
6.6.1. Modifying the Shroud Tip Layer.............................................................................................. 48
6.7. Adding Intermediate Layers............................................................................................................ 49
6.8. Generating the Mesh...................................................................................................................... 50
6.9. Analyzing the Mesh........................................................................................................................ 50
6.10. Adding Inlet and Outlet Domains.................................................................................................. 51
6.11. Regenerating the Mesh................................................................................................................. 51
6.12. Analyzing the New Mesh............................................................................................................... 51
6.13. Saving the Mesh........................................................................................................................... 52
6.14. Saving the State (Optional)............................................................................................................ 52
7. Splitter Blades....................................................................................................................................... 53
7.1. Before You Begin............................................................................................................................. 54
7.2. Starting ANSYS TurboGrid............................................................................................................... 54
7.3. Defining the Geometry................................................................................................................... 55
7.4. Defining the Topology.................................................................................................................... 55
7.5. Reviewing the Topology Settings.................................................................................................... 55
7.6. Reviewing the Mesh Data Settings.................................................................................................. 56
7.7. Reviewing the Mesh Quality on the Hub and Shroud Layers............................................................. 56
7.7.1. Modifying the Hub Layer........................................................................................................ 56
7.8. Generating the Mesh...................................................................................................................... 57
7.9. Analyzing the Mesh........................................................................................................................ 57
7.10. Saving the Mesh........................................................................................................................... 58
7.11. Saving the State (Optional)............................................................................................................ 58
8.Tandem Vane......................................................................................................................................... 59
8.1. Before You Begin............................................................................................................................. 60
8.2. Starting ANSYS TurboGrid............................................................................................................... 60
8.3. Defining the Geometry................................................................................................................... 61
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Tutorials
8.4. Defining the Topology.................................................................................................................... 61
8.5. Reviewing the Topology Settings.................................................................................................... 62
8.6. Reviewing the Mesh Data Settings.................................................................................................. 62
8.7. Reviewing the Mesh Quality on the Hub and Shroud Layers............................................................. 62
8.7.1. Modifying the Hub Layer........................................................................................................ 62
8.7.2. Modifying the Shroud Tip Layer.............................................................................................. 65
8.8. Increasing the Mesh Density........................................................................................................... 66
8.9. Further Modifying the Hub Layer..................................................................................................... 66
8.10. Generating the Mesh.................................................................................................................... 69
8.11. Saving the Mesh........................................................................................................................... 69
8.12. Saving the State (Optional)............................................................................................................ 70
9. Batch Mode Studies.............................................................................................................................. 71
9.1. Before You Begin............................................................................................................................. 71
9.2. Part 1: Parametric Study.................................................................................................................. 71
9.2.1. Starting ANSYS TurboGrid...................................................................................................... 72
9.2.2. Defining the Geometry........................................................................................................... 72
9.2.3. Creating the Topology and Modifying the Mesh...................................................................... 72
9.2.4. Creating the Session File......................................................................................................... 73
9.2.5. Running the Session File......................................................................................................... 74
9.3. Part 2: Grid Refinement................................................................................................................... 75
9.3.1. Starting ANSYS TurboGrid...................................................................................................... 75
9.3.2. Defining the Geometry and Topology..................................................................................... 75
9.3.3. Creating the Session File......................................................................................................... 76
9.3.4. Running the Session File......................................................................................................... 77
10. Deformed Turbine............................................................................................................................... 79
10.1. Before You Begin........................................................................................................................... 80
10.2. Starting ANSYS TurboGrid............................................................................................................. 80
10.3. Mesh for the Deformed Blade Group............................................................................................. 81
10.3.1. Defining the Geometry for the Deformed Blade Group.......................................................... 81
10.3.1.1. Loading an Undeformed Blade..................................................................................... 81
10.3.1.2. Moving the Periodic Surfaces....................................................................................... 81
10.3.1.3. Inserting Two More Blades........................................................................................... 81
10.3.1.4. Adding a Shroud Tip.................................................................................................... 83
10.3.1.5. Adjusting the Inlet and Outlet Points............................................................................ 83
10.3.1.6. Saving the Periodic/Interface Surfaces.......................................................................... 86
10.3.1.7. Saving the Inlet and Outlet Locations........................................................................... 87
10.3.2. Defining the Topology for the Deformed Blade Group........................................................... 87
10.3.3. Reviewing the Mesh Data Settings for the Deformed Blade Group......................................... 88
10.3.4. Reviewing the Mesh Quality on the Hub and Shroud Tip Layers of the Deformed Blade
Group............................................................................................................................................. 89
10.3.4.1. Modifying the Hub Layer............................................................................................. 89
10.3.4.2. Modifying the Shroud Tip Layer................................................................................... 90
10.3.5. Increasing the Mesh Density for the Deformed Blade Group.................................................. 93
10.3.6. Revisiting the Mesh Quality on the Hub and Shroud Tip Layers of the Deformed Blade
Group............................................................................................................................................. 95
10.3.7. Generating the Mesh for the Deformed Blade Group............................................................. 95
10.3.8. Analyzing the Mesh for the Deformed Blade Group............................................................... 95
10.3.9. Saving the Mesh for the Deformed Blade Group.................................................................... 96
10.3.10. Saving the State for the Deformed Blade Group (Optional).................................................. 96
10.4. Mesh for an Undeformed Blade..................................................................................................... 96
10.4.1. Starting a New Case............................................................................................................. 96
10.4.2. Defining the Geometry for the Undeformed Blade................................................................ 97
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10.4.2.1. Adding a Shroud Tip.................................................................................................... 98
10.4.3. Defining the Topology for the Undeformed Blade................................................................. 98
10.4.4. Reviewing the Mesh Data Settings for the Undeformed Blade............................................... 99
10.4.5. Reviewing the Mesh Quality on the Hub and Shroud Tip Layers of the Undeformed Blade...... 99
10.4.5.1. Modifying the Hub Layer............................................................................................ 100
10.4.6. Increasing the Mesh Density for the Undeformed Blade...................................................... 101
10.4.7. Revisiting the Mesh Quality on the Hub and Shroud Tip Layers of the Undeformed Blade..... 102
10.4.8. Generating the Mesh for the Undeformed Blade................................................................. 102
10.4.9. Analyzing the Mesh for the Undeformed Blade................................................................... 102
10.4.10. Saving the Mesh for the Undeformed Blade...................................................................... 102
10.4.11. Saving the State for the Undeformed Blade (Optional)....................................................... 103
10.5. Summary.................................................................................................................................... 103
10.6. Further Exercise.......................................................................................................................... 103
11. Francis Turbine.................................................................................................................................. 105
11.1. Before You Begin......................................................................................................................... 106
11.2. Starting ANSYS TurboGrid........................................................................................................... 106
11.3. Defining the Geometry............................................................................................................... 106
11.3.1. Adjusting the Outlet Points................................................................................................. 107
11.4. Defining the Topology................................................................................................................. 108
11.5. Reviewing the Mesh Quality on the Hub and Shroud Layers......................................................... 109
11.5.1. Modifying the Hub Layer.................................................................................................... 109
11.5.2. Modifying the Shroud Layer................................................................................................ 113
11.6. Specifying Mesh Data Settings.................................................................................................... 115
11.7. Generating the Mesh................................................................................................................... 116
11.8. Analyzing the Mesh..................................................................................................................... 116
11.9. Saving the Mesh......................................................................................................................... 116
11.10. Saving the State (Optional)........................................................................................................ 116
Index........................................................................................................................................................ 117
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Chapter 1: Introduction to the ANSYS TurboGrid Tutorials
The ANSYS TurboGrid tutorials are designed to introduce general mesh-generation techniques used in
ANSYS TurboGrid.
Note
These tutorials assume that you are using ANSYS TurboGrid in stand-alone mode. If you
would like to attempt running one of these tutorials in ANSYS Workbench, you should first
be familiar with ANSYS Workbench and review the documentation in ANSYS TurboGrid in
ANSYS Workbench in the TurboGrid Introduction.
You should review the following topics before attempting to start a tutorial for the first time:
1.1. Preparing a Working Directory
1.2. Setting the Working Directory and Starting ANSYS TurboGrid
1.3. Changing the Display Colors
1.4. Editor Buttons
1.5. Using Help
1.1. Preparing a Working Directory
ANSYS TurboGrid uses a working directory as the default location for loading and saving files for a
particular session or project. Before you run a tutorial, you must create a working directory and copy
in the files that are listed near the top of the tutorial.This practice will prevent you from making acci-
dental changes to any of the files that came with your installation.The files are available from your
ANSYS TurboGrid installation and from the ANSYS Customer Portal.
The tutorial input files are available in your ANSYS TurboGrid installation in <CFXROOT>/examples,
where <CFXROOT> is the installation directory for ANSYS TurboGrid.
To access tutorials and their input files on the ANSYS Customer Portal, go to http://support.ansys.com/
training.
1.2. Setting the Working Directory and Starting ANSYS TurboGrid
Before you start ANSYS TurboGrid, set the working directory.
1. Start the ANSYS TurboGrid Launcher.
For details, see Starting the ANSYS TurboGrid Launcher in the TurboGrid Introduction.
2. Select a working directory.
3. Click the TurboGrid 15.0 button.
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Introduction to the ANSYS TurboGrid Tutorials
1.3. Changing the Display Colors
If viewing objects in ANSYS TurboGrid becomes difficult due to contrast with the background, the colors
can be altered for improved viewing.You can access the color options by going through the following
steps:
1. Select Edit > Options.
The Options dialog box appears.
2. Adjust the color settings under TurboGrid > Viewer.
3. Click OK.
1.4. Editor Buttons
The ANSYS TurboGrid interface uses editors to enter the data required to create a mesh.The editors
have standard buttons, which are described next:
• Apply applies the information contained within all the tabs of an editor.
• OK is the same as Apply, except that the editor automatically closes.
• Cancel and Close both close the editor without applying or saving any changes.
• Reset returns the settings for the object to those stored in the database for all the tabs.The settings are
stored in the database each time the Apply button is clicked.
• Defaults restores the system default settings for all the tabs of the edited object.
1.5. Using Help
To open the ANSYS Help Viewer, select Help > Contents.
Context-sensitive help is provided for many of the object editors and other parts of the interface.To
invoke the context-sensitive help for a particular editor or other feature, ensure that the window is
active, place the mouse pointer over the feature, and press F1. Not every area of the interface supports
context-sensitive help.
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Chapter 2: Rotor 37
This tutorial includes:
2.1. Overview of the Mesh Creation Process
2.2. Before You Begin
2.3. Starting ANSYS TurboGrid
2.4. Defining the Geometry
2.5. Defining the Topology
2.6. Reviewing the Mesh Data Settings
2.7. Reviewing the Mesh Quality on the Hub and Shroud Tip Layers
2.8. Generating the Mesh
2.9. Looking at Mesh Data Values
2.10. Analyzing the Mesh Quality
2.11.Visualizing the Hub-to-Shroud Element Distribution
2.12. Observing the Shroud Tip Mesh
2.13. Examining the Mesh Qualitatively
2.14. Creating a Legend
2.15. Saving the Mesh
2.16. Saving the State (Optional)
This tutorial demonstrates the basic workflow for generating a CFD mesh using ANSYS TurboGrid. As
you work through this tutorial, you will create a mesh for a blade passage of an axial compressor blade
row. A typical blade passage is shown by the black outline in the figure below.
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Rotor 37
The blade row contains 36 blades that revolve about the negative Z-axis. A clearance gap exists between
the blades and the shroud, with a width of 2.5% of the total span.Within the blade passage, the max-
imum diameter of the shroud is approximately 51 cm.
You will save the mesh in a format that can be used by ANSYS CFX in a CFD simulation.
2.1. Overview of the Mesh Creation Process
Before ANSYS TurboGrid can create a mesh, you must provide it with several pieces of information.
Such information includes the location of the geometry files (hub, shroud, and blades), the mesh topology
type, and the distribution of mesh nodes. All of the data that you provide is stored in a set of data objects
known as CCL objects. After you have specified the CCL objects appropriately, you can issue a command
for ANSYS TurboGrid to generate a mesh.
The ANSYS TurboGrid user interface organizes the CCL objects in a tree view known as the object selector.
You can use the object selector to select and edit the CCL objects; the objects are listed from top to
bottom in the standard order for creating a mesh.The user interface also has a toolbar for selecting
and editing the CCL objects; the icons are arranged from left to right in the standard order for creating
a mesh.
Regardless of whether you use the object selector or the toolbar, you should generally follow this se-
quence when creating a mesh:
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