STARCCM实例操作教程(凤洞仿真).pptx

WORKSHOP: The STAR-CCM+ workflow,43,Introduces the main processes in STAR-CCM+,Car in a wind tunnel,Objective: Follow through all the stages in the STAR-CCM+ workflow. Gain confidence in using the STAR-CCM+ interface. This exercise uses a simple geometry of a car in a wind tunnel. Later exercises will build on the basics learnt here.,44,Workflow for a simple car,Features covered: Import .x_t geometry of surface. No surface repair required. Split surfaces to define required boundaries. Define mesh settings. Specify thickness of prism layer. Define physics settings. Incompressible, turbulent, steady. Check solver settings. Use defaults. Run simulation. Post processing is covered in next exercise!,45,Start a STAR-CCM+ simulation,Launch STAR-CCM+. Start a new simulation by going to File New Simulation… Keep the default settings in the dialogue box and click on OK.,46,,,Import geometry,File Import Import Surface Mesh and choose the surface named Workflow / wind_tunnel.x_t. Select to Create New Part, leave remaining options at their default values and click OK in the Import Surface Options dialog.,47,,,Import Geometry,The import shows one geometry part, containing one surface. In the scene/plot panel select Geometry Scene 1 Displayers Geometry 1. In the Properties panel, turn on the Mesh display option. Geometry and scalar displayers also change by using the scene toolbar’s activate mesh button. Save the file as wind_tunnel.sim.,48,,,Check Surface,Check the surface for errors. Go to the simulation tree. Right-click on Geometry Parts wind_tunnel Repair Surface. Click OK in the opening window.,49,,,,Check Surface,In the edit panel click on Manage Thresholds. In the new panel check that all thresholds are active, then click Apply and OK.,50,,,,,Check Surface,There are no grave errors in the geometry, close the panel after checking them. The Close Proximity Faces are resolved after splitting and interface creation. Poor Quality Faces are gone after remeshing.,51,Scaling and Splitting,We need to scale the import by a factor of 10 to change the length to meters. Select Geometry Parts wind_tunnel node. Right click and select Transform Scale from context menu. In the dialog box enter a Scale Factor of 10. Click Apply and Close. Click on the Reset View icon. Split the imported surfaces to assign to individual boundaries. Select the Geometry Parts wind_tunnel Surfaces Faces node. Right click and select Split by Patch. from the context menu.,52,,,,,Specify geometry setup,Split and rename the Part Surfaces. Click the front face of the airflow in the wind tunnel, rename it to Inlet and click Create. Do the same for the other faces: The symmetry face Symmetry The side face Wall The back face Outlet The bottom face Floor The top face Top Click Close.,53,,,Specify geometry setup,Split the car into separate surfaces too. Right click on Faces and select Split Non-Contiguous from context menu. Click on the names of the three newly created surfaces to highlight their geometry in the scene. Select the two wheels using CTRL, then right click and select Combine to gather them under the same boundary. Rename the wheels as Wheels and the car as Body.,54,,,Transfer of geometry elements,STAR-CCM+ separates geometry parts from simulation relevant regions. Simulation relevant parts need to be transferred into the regions folder. Select wind_tunnel Assign Parts to Regions… Modes: One region per part. One boundary per part surface. Click Create Regions and Close.,55,,,,Define boundary conditions,The boundary type affects the meshing. Go to Regions. Select each boundary and set its Type in the Properties window following the table below.,56,,,,Select mesh models,Select the meshing models, STAR-CCM+ loads additional functionality only if required. Go to Parts wind_tunnel. Right click and select Create Mesh Operation Automated Mesh. Check that wind_tunnel is selected for Parts and select the models: Surface Remesher. Trimmed Cell Mesher. Prism Layer Mesher. Click OK. A new entry appears under Operations. The yellow exclamation mark indicates that this operation has not been executed yet.,57,,Default mesh settings,Make the default mesh settings. Go to Operations Automated Mesh. Under Default Controls set: Base Size: 0.25 m. Prism Layer Total Thickness Relative Size: 10%.,58,Generate mesh,Start the meshing pipeline. Go to Operations Automated Mesh. Right click and select Execute. Or press the Generate Volume Mesh button in the toolbar. STAR-CCM+ automatically generates a surface mesh, then a volume mesh with prism layers on the walls. The exclamation mark disappears and a new node is added to Continua: Parts Meshes.,59,,,,Generate mesh,In a new scene the mesh is visualized. Create a new mesh scene. Right click on the Scenes New Scene Mesh. Or use the Create/Open Scenes button in the vis toolbar: Make the scene transparent.,60,,Visualize Mesh,Change the view. Press T on your keyboard. This is a shortcut for Top view in z-direction. Make view paral。