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Hello, there were a few questions coming up, concerning the workflow for virtual wind tunnel analysis. You can have a look at the tutorials in the help of VWT (File --> Help --> Tutorials) to get a first idea of how to set up a model from the beginning. Additionally, you will find a video on http://training.altairuniversity.com/analysis/cfd/virtual-wind-tunnel/ To answer the questions in detail: 1) What CAD formats can be read into VWT The VWT does not read CAD data directly. You have to provide an Finite Element Surface Mesh in Nastran (Fluent) format instead. This mesh can be done in HyperMesh (Engineering Solutions --> CFD user profile). HyperMesh can read solidworks, Catia, ProE, Siemens NX, STEP, Iges and other CAD formats. Go to File --> import --> geometry and choose the filter type in this menu 2) How should you save the Mesh File in HyperMesh? After meshing, you need to check if your surface mesh is enclosed and of good quality. Go to the Checks Toolbar --> Edges and see for free edges and T-Connections. The status bar should say "no edges / T-Connections were found, selected elements enclose a volume". Next go to the element check (F10) and look for elements with poor quality (tria angle < 5°, Skew > 80), duplicates and connectivity. Clean up the failed elements. After the element check is complete, export under file --> export --> solver deck and choose Nastran (Fluent) format as solver type 3) Meshing Tutorials: The tutorials on meshing can be found in the Altair HyperMesh Help, e.g. CFD-1400: Wind Tunnel Mesh Note, that for VWT, only the 2D surface mesh is needed. Best Regards Jan