ANSYS R13 Missile FSI Example
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Transcript of ANSYS R13 Missile FSI Example
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ANSYS R13
External Aerodynamics and
One-Way FSI Modeling
Hawk Missile Example Simulation
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Presented by: Michael Showalter April 6, 2011
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Presentation Overview • Analysis Tools
• Hawk Missile Geometry
• Computational Meshes (Fluid & Solids)
• Model Definition
• CFD Fluids Results
• One-Way Pressure Coupling to ANSYS Mechanical
• External Data Set Capability (new R13)
• Questions and Discussion
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ANSYS Suite of Analysis Tools
• ANSYS Workbench: – DesignModeler (geometry creation)
– ANSYS Meshing (mesh generation)
– FLUENT (CFD - fluids solver)
– ANSYS (thermal & structural analyses)
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Missile Geometry
Hawk Missile Body
Virtual Wind Tunnel
Farfield Flow Inlet
Farfield Flow Outlet
Angle of Attack 20o
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Missile Geometry (zoom)
Half Symmetry
Farfield Flow Inlet
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FLUENT Computational Mesh
Mesh Refinement Around the Missile Body
Volume Mesh, CutCells (2.6M Total Elements)
Flow Inlet
Flow Outlet
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FLUENT Computational Mesh
Fluid Region CutCells with
B.L. Mesh
Boundary Layer
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Computational Model Definition
• Steady state flow conditions (i.e. not changing with time)
• Three-dimensional model
• Linear elastic structural analysis
• Turbulent flow (SST k/omega model)
• Fluid: air, ideal gas
• Air inflow/outflow conditions:
– Velocity = Mach 2.5, sea level, AoA 20o
– Temperature = 70 °F
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ANSYS Workbench
One-Way FSI (Coupled) CFD, Pressure & Structural
Simulation
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Velocity Vectors
Mach 2.5, AoA 20o
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Pressure Contours (Pa)
Air Flow
Mach 2.5, AoA 20o
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Transparent Volume of Velocity
Mach 2.5, AoA 20o
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Streamlines colored by Pressure (Pa)
Mach 2.5, AoA 20o
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Mapping Project Page The following project schematic illustrates one-way load mapping from FLUENT to Mechanical.
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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.
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Hawk Missile M=0.9 Hawk Missile M=2.5
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Enter line number where data starts
Format type: delimited
Delimiter type: Comma
*.csv File Name Use to browse to *.csv file location
Entered a Description (optional)
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
External Data Importing Overview
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External Data Method Pressure Mapping
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Mach 2.5, AoA 20o
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Fixed Support at Nosetip, Inertial Relief
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Contours of Total Deformation
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Mach 2.5, AoA 20o
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Contours of Equivalent Stress
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Mach 2.5, AoA 20o