ANSYS R13External Aerodynamics and One-Way FSI Modeling Hawk Missile Example Simulation April 6, 2011 Presented by: Michael Showalter 1 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 2 ANSYS Suite of Analysis Tools • ANSYS Workbench: – DesignModeler (geometry creation) – ANSYS Meshing (mesh generation) – FLUENT (CFD .fluids solver) – ANSYS (thermal & structural analyses) 3 . Missile Geometry Virtual Wind Tunnel Farfield Flow Outlet Hawk Missile Body Farfield Flow Inlet Angle of Attack 20o 4 . Missile Geometry (zoom) Farfield Flow Inlet Half Symmetry 5 . CutCells (2.FLUENT Computational Mesh Volume Mesh.6M Total Elements) Flow Outlet Flow Inlet Mesh Refinement Around the Missile Body 6 . Mesh Boundary Layer 7 .L.FLUENT Computational Mesh Fluid Region CutCells with B. Computational Model Definition • Steady state flow conditions (i.e.5. AoA 20o – Temperature = 70 °F 8 . 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. sea level. Pressure & Structural Simulation 9 .ANSYS Workbench One-Way FSI (Coupled) CFD. Velocity Vectors Mach 2.5. AoA 20o 10 . Pressure Contours (Pa) Mach 2.5. AoA 20o Air Flow 11 . Transparent Volume of Velocity Mach 2.5. AoA 20o 12 . AoA 20o 13 .5.Streamlines colored by Pressure (Pa) Mach 2. Mapping Project Page The following project schematic illustrates one-way load mapping from FLUENT to Mechanical.9 Hawk Missile M=2.5 14 . Hawk Missile M=0. 9 Hawk Missile M=2.e. Hawk Missile M=0. The loading needs to be in a delimited format. In the below example. Excel . i.csv file. pressures loads were extracted from FLLUENT and mapped to the Mechanical model. The next slide illustrates the external data setup. The data is entered using an External Data component system from the project schematic and then linked to the appropriate analysis.External Data Method New at R13 is the ability to import loads from ANSYS tools.5 15 . or even user defined loading. third party software. csv File Name Use to browse to *.External Data Importing Overview *.csv file location Entered a Description (optional) Enter line number where data starts Format type: delimited Delimiter type: Comma 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 16 . AoA 20o 17 .External Data Method Pressure Mapping Mach 2.5. Inertial Relief 18 .Fixed Support at Nosetip. 5.Contours of Total Deformation Mach 2. AoA 20o 19 . 5.Contours of Equivalent Stress Mach 2. AoA 20o 20 .