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Found 58 results

  1. can anyone tell me what is the procedure to make or produce a flow domain around a solid body that i have imported from a CAD platform into hypermesh.
  2. Hi, I am using hypermesh to generate CFD tetramesh and boundary layer to model a flow into pipes. I am first working on a simple pipe with an inlet and an outlet. I am using the cfd tetra mesh panel to generate the boundary layer and the tetramesh core. The boundary layer obtained is good for the first couple layers but the elements start to skew at some point which result in a very bad boundary layer mesh. This is extremely disappointing since this is one of the simplest case I can think of. I am planning to use the cfd mesher for a much complex piping case and this kind of mesh is not acceptable. Please help me with this issue. I used hypermesh 12.0.117. I attached a screenshot of the parameters used for the boundary layer. I also tried several other combination of the parameters. I also tried selecting float or fixed boundary layer without success. I also attached screenshots of the resulting elements to illustrate the problem. I also attach a .txt file containing the model of the pipe. (just change de extension to .fem and import it in hypermesh, I had to change extension otherwise the upload was not authorized). The pipe and inlet/outlet components are used as 2d input mesh for the boundary layer mesh generation. Thanks in advance for your help, I really need to make this work! cfd_tetramesh_BL_bug_example.txt
  3. Dear All: I am trying to perform a CFD analysis for a building in wind with opening FSI. But I am afraid I didn’t see the building response (I thought the building should sway after I setting up the options related to FSI). Please see the following description. Thank you very much for your help. I defined four nodes at the top of the building for getting time-history responses. And the velocity of the lower-left point in x-direction and y-direction (two horizontal directions), they are 0 all the time. By opening the FSI, I did the following, would you please help me check if I missed something in the definition? 1. Go to the Eigenmode Manager, import the modal analysis results from OptiStruct. The animation is shown in the following screenshot 2. Change the wall boundary condition to “flexible body” and select “building” as the “Flexible body”
  4. Hi guys, I have been performing an analysis in Acusolve and wanted to see an animation of the points but I cant click on the option Transient Data as the tutorial suggests. When I click build on the seeding panel, the points only appear one time in all the time steps and I cant visualize them moving. The global problem solution was defines as transient using SST and fixed mesh. Also I need to get the drag. How should I get the values to calculate drag or Lift after performing any Steady State or Transient analysis? Thanks in advance
  5. Hi all, I am trying to create a simple CFD tetramesh in a pipe. When I try and run the Acusolve solution, I get the error "No Valid 3D element found in the neighbourhood of a trai element". The resulting error shows "Exterior Trias" and "External Quads" and show voids in the boundary layer mesh at random mesh locations. Can anyone help me with this issue? The Pipe inflows and outflows are set as W/O BL float and the Wall is set as With BL Fixed. Cheers, James
  6. Hi, I'm trying to brick mesh a straight pipe for OpenFOAM CFD, meaning I need a boundary layer, shell elements on the outer surfaces and a core - all hex elements. My meshing attempts up to now were only partially successful. I created a boundary layer by splitting the solid in an inner and outer pipe, then subtract one from the other, deleting the solid so I've got the inner and outer surfaces, created a surface mesh, then brick elements by using Element offset for the boundary layer. Unfortunately, the shell elements are lost in the process and I don't quite know how to create shells from the existing solids. Project nodes does not seem to be the right tool. If someone could post a general workflow for this type of brick meshing I'd be very grateful. I've only used CFD tetramesh up to now, but OpenFOAM does seem to prefer brick elements. Unfortunately, I can't use hex core with a tetra oder penta boundary layer and transition, OpenFOAM can't handle different element types at once. Edit: Sorry, this should have been posted in the Hypermesh subforum!
  7. Click here to view the HyperWorks CFD AcuSolve 2017 webinar recording
  8. DRP

    problem

    What is assertion in function ? I have attached an image. What does that mean ?
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