Transcript
ANSYS R13 External Aerodynamics and One-Way One-Wa y FSI Modeling Modeling Hawk Missile Example Simulation April 6, 2011
Presented by: Michael Showalter 1
Presentation Overview •
Analysis Tools
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Hawk Missile Geometry
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Computational Meshes (Fluid & Solids)
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Model Definition
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CFD Fluids Results
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One-Way Pressure Coupling to ANSYS Mechanical
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External Data Set Capability (new R13)
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Questions and Discussion 2
ANSYS Suite of Analysis Tools •
ANSYS Workbench: –
DesignModeler (geometry creation)
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ANSYS Meshing (mesh generation)
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FLUENT (CFD - fluids solver)
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ANSYS (thermal & structural analyses)
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Missile Geometry Virtual Wind Tunnel
Farfield Flow Outlet Hawk Missile Body Farfield Flow Inlet
Angle of Attack 20o
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Missile Geometry (zoom)
Farfield Flow Inlet
Half Symmetry
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FLUENT Computational Mesh Volume Mesh, CutCells (2.6M Total Elements)
Flow Outlet
Flow Inlet
Mesh Refinement Around the Missile Body
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FLUENT Computational Mesh Fluid Region CutCells with B.L. Mesh
Boundary Layer 7
Computational Model Definition •
Steady state flow conditions (i.e. not changing with time)
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Three-dimensional model
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Linear elastic structural analysis
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Turbulent flow (SST k/omega model)
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Fluid: air, ideal gas
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Air inflow/outflow conditions: –
Velocity = Mach 2.5, sea level, AoA 20 o
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Temperature = 70 °F 8
ANSYS Workbench One-Way FSI (Coupled) CFD, Pressure & Structural Simulation 9
Velocity Vectors Mach 2.5, AoA 20 o
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Pressure Contours (Pa) Mach 2.5, AoA 20 o
Air Flow
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Transparent Volume of Velocity
Mach 2.5, AoA 20 o
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Streamlines colored by Pressure (Pa) Mach 2.5, AoA 20 o
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Mapping Project Page The following project schematic illustrates one-way load mapping from FLUENT to Mechanical.
Hawk Missile M=0.9
Hawk Missile M=2.5
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External Data Method New at R13 is the ability to import loads from ANSYS tools, third party software, or even user defined loading. The loading needs to be in a delimited format, i.e. Excel .csv file. The data is entered using an External Data component system from the project schematic and then linked to the appropriate analysis. In the below example, pressures loads were extracted from FLLUENT and mapped to the Mechanical model. The next slide illustrates the external data setup.
Hawk Missile M=0.9
Hawk Missile M=2.5
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External Data Importing Overview
*.csv File Name
Use to browse to *.csv file location Entered a Description (optional) Enter line number where data starts
Format type: delimited
Specified data type and units for four columns imported
Added a data indentifier for Clipped Pressure (optional)
Preview of portion of data to make sure import correct
Delimiter type: Comma
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External Data Method Pressure Mapping Mach 2.5, AoA 20 o
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Fixed Support at Nosetip, Inertial Relief
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Contours of Total Deformation
Mach 2.5, AoA 20 o
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Contours of Equivalent Stress
Mach 2.5, AoA 20 o
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