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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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Oct 10, 2012 Internal Combustion. Engines. • Demonstration example. • Validation & verification Internal combustion engine simulation components Transient mass flow. • Prescribed . Flat head, flat piston, SI ICE. • Fuel: C3 . transfer of cylinder head. Transient Heat Flux n-heptane
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Validation and Verification of ANSYS Internal Combustion Engine PDF

66 Pages·2012·6.69 MB·English
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Oct 10, 2012 Internal Combustion. Engines. • Demonstration example. • Validation & verification Internal combustion engine simulation components Transient mass flow. • Prescribed . Flat head, flat piston, SI ICE. • Fuel: C3 . transfer of cylinder head. Transient Heat Flux n-heptane

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