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    • Rahul Ponginan

      Please click here for a short but important announcement   03/26/17

      Dear Users Our Commercial and Academic users around the world can use these same forums here as before i.e. the Altair Support Forum , Commercial users from India with solver queries can go to the Solver Forum for India Commercial Users , Academic Users from India and AOC India Participants are requested to go to the Forum for India Academic Users and AOC India Participants , We will be tending to all queries in all the forums promptly as before, thank you for your understanding. 

Onkar

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  1. Hello, It is not necessary to switch the display off while working on purge command. Will you please redirect us to the video where you've seen that...!
  2. Hello, PFA video as an answer. ABC is just given as a illustration. As soon as you tap on the new material, you can edit the properties. material_model.mp4
  3. Hello, Air, Aluminium and Water are available as a by default option.
  4. Nice Question...! For simple problems, you can keep the value of relaxation factor at its default one. As relaxation factor works on suppressing the solution (from previous iteration), surely it is going to take a lot of time. Taking the project span into consideration, you have to use it when it is really needed.
  5. Generally, value between 0.2 - 0.4 provides good balance between achieving small progression of solution and extra compute time needed to achieve the convergence.
  6. Relaxation factor is primarily a number which is used to converge the solution.
  7. Absolutely...! The mesh on the surface "one" is prescribed by relative mesh size. Relative mesh size of 0.125 is used in here. Assuming the largest length in the model to be one meter, this is multiplied by 0.125 (the no. mentioned earlier) to generate a surface mesh where the largest element is 0.125 (1*0.125 = 0.125). The resulting mesh may look like this-
  8. Interesting question...! When you’re fully aware of the size of model, just go for absolute. Absolute mesh size has a unit length which can be modified also. But in actual practice, you may have to do couple of iterations for meshing to the benchmark level (set by organization). In relative meshing which is found out by a factor (a number ranging from 0 to 1) multiplied with the largest edge length of the bounding box for each geometric face in the surface group, different mesh size maybe used for faces of the model.
  9. If you use curvature-based refinement on surfaces that have sharp curves, you must specify a reasonable minimum curvature size either globally. Otherwise, extensive amounts of mesh refinement will take place in that area. In general, it is the parameter which defines mesh refinement in sharply arched areas.
  10. Hi, These are the parameters used to resolve curvatures in the geometry. In the data tree manager, when you turn this option ON, you'll see two options which are mentioned below. A] Curvature Angle- Its a ratio of curvature height to chord. B] Curvature mesh size factor- Its a ratio of min. mesh size to mesh size.
  11. Hello, Please find attached video where you can get how to give velocity inflow in AcuSolve. While selecting an option from drop down menu, co-ordinate system (Cartesian, cylindrical and spherical) specifies vector components to be given as an input. This will be very much useful for 3D cases. velocity_inflow.mp4
  12. In slip boundary condition, viscous forces aren't considered. i.e. 1st layer of the fluid won't stick to the surface. And in wall boundary condition, all the viscous effects are considered.
  13. Krunal, Both the terms actually describes fraction of initial design space in topology optimization. Both are global responses with the range 0.0 to 1.0. Mass fraction includes non-design space in fraction calculation whereas volume fraction only considers design space. Please have a look into the image for reference. (Image Courtesy: http://www.altairhyperworks.in/product/OptiStruct) Courtesy: Typical optimization process on VW compressor bracket
  14. Looks like something is wrong with the model set-up. Please check for surface manager i.e. organizing the surface.