Validation and Verification of ANSYS Internal Combustion Engine Software

66 Pages·2012·6.69 MB·English

Validation and Verification of ANSYS Internal
Combustion Engine Software
Martin Kuntz, ANSYS, Inc.
Contents
• Definitions
• Internal Combustion
Engines
• Demonstration example
• Validation & verification
– Spray box
– Combustion
– Port flow applications
– IC engine applications

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Contents
• Definitions
• Internal Combustion
Engines
• Demonstration example
• Validation & verification
– Spray box
– Combustion
– Port flow applications
– IC engine applications

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Definitions
• Verification
– Verify, that model is implemented correctly
– Characteristics
• Simplified geometry
• Focused on single physical model
• Compare to analytical or other CFD
• Validation
– Demonstrate simulation accuracy
– Characteristics
• Realistic geometry
• A combination of physical models
• Compare to experimental data
• Demonstration
– Illustrate application of software to generic case
– Characteristics
• Realistic geometry
• A combination of physical models
• No comparison to data
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Contents
• Definitions
• Internal Combustion
Engines
• Demonstration example
• Validation & verification
– Spray box
– Combustion
– Port flow applications
– IC engine applications

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IC Engine Simulations Types
• Component simulations
– Intake port, intake manifold,
water jackets, fuel injectors
– Spray bomb
• IC engine simulations
– Cold flow
• Charge motion
– Combustion
• Thermal management
• Emissions

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ICE Simulation Workflow
• Internal combustion engine simulation components
– Preprocessing
• Geometry decomposition
• Initial meshing
• Simulation parameter definition
– Moving deforming meshes
• Smoothing, remeshing, layering
– Particle tracking
• Injection, tracking, evaporation, wall-interaction
– Combustion
• Ignition, flame front propagation
– Post-processing
• Automatic processing of monitor and solution data

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Contents
• Definitions
• Internal Combustion
Engines
• Demonstration example
• Validation & verification
– Spray box
– Combustion
– Port flow applications
– IC engine applications

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Demonstration : Direct Injection Gasoline Engine
• Complete cycle setup
– Initial conditions and boundary
conditions provided by 1D
simulation
– Material Iso-octane
– Spray injection
• 6-hole injector
• Double injection
• Transient mass flow
• Prescribed diameter distribution
– Liquid evaporation model
– Spark ignition
– G equation combustion
• Testcase provided by BMW

Courtesy: BMW
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Demonstration : Direct Injection Gasoline Engine
• Initialization
– Burned conditions at EVO
• Boundary condition
– Specified temperature
• Mesh size: cell count
– 800.000 (TDC) to 1.600.000 (BDC)
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