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Found 5 results

  1. Hello, In mesh control option, I am unable to get mesh by defining feature based control, I am getting error saying internal meshing error. Can somebody help me in resolving this problem, and explain me how feature based mesh control works? and how to define them? Regards Govardhan
  2. Hi there! Would someone please explain me one thing? I have a complex solid model. I split it on parts. Each of parts have own plane of symmetry. So I split each one to mesh just half (quarter). Then after surface mesh of half (quarter) I reflect 2d mesh to opposite part and associate nodes to it. After I try to mesh faces of the connected parts. But time to time mesher not "feels" associated nodes. Often it not "feels" associated nodes for edges with T-connections (works for only 2 surfaces of 3). It makes me crazy... Thnx in advance for answer.
  3. Hi, I have been trying to eliminate the element concentrations caused by HM 3D tetra remesh for a couple of months now and yet there is no robust solution available. I wonder if it is possible to extract a surface mesh from the 3D mesh components - for instance the front surface in attached pic and then remesh the surface mesh in a 2D manner. Later, after the new surface mesh is created, apply the 3D remesh feature to the entire mesh component basing on the new surface mesh. Would it be feasible in HM? How can I possibly extract the surface mesh and remesh it with certain "feature angle" parameter to filter out the wanted small segments? and can I use 3D tetra remesh with pre-defined 2D surface mesh? Answer to any of these questions would be most welcome. Many thanks, Wensong
  4. Hi, I sometimes encounters mesh voids in my simulations (see figure attached), and was wondering if there are features to semi-manually or automatically fill the voids or gaps with elements? Thanks in advance. Wensong
  5. 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
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