Validation and Verification of ANSYS Internal Combustion Engine Software PDF
Preview Validation and Verification of ANSYS Internal Combustion Engine Software
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 Wednesday, October 10, 2012 2012 Automotive Simulation World Congress 2 Contents • Definitions • Internal Combustion Engines • Demonstration example • Validation & verification – Spray box – Combustion – Port flow applications – IC engine applications Wednesday, October 10, 2012 2012 Automotive Simulation World Congress 3 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 Wednesday, October 10, 2012 2012 Automotive Simulation World Congress 4 Contents • Definitions • Internal Combustion Engines • Demonstration example • Validation & verification – Spray box – Combustion – Port flow applications – IC engine applications Wednesday, October 10, 2012 2012 Automotive Simulation World Congress 5 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 Wednesday, October 10, 2012 2012 Automotive Simulation World Congress 6 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 Wednesday, October 10, 2012 2012 Automotive Simulation World Congress 7 Contents • Definitions • Internal Combustion Engines • Demonstration example • Validation & verification – Spray box – Combustion – Port flow applications – IC engine applications Wednesday, October 10, 2012 2012 Automotive Simulation World Congress 8 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 Wednesda y, October 10, 2012 2012 Automotive Simulation World Congress 9 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) Wednesday, October 10, 2012 2012 Automotive Simulation World Congress 10
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