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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. 

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Found 5 results

  1. Hello everybody, I want to perform an explicit analysis in radioss. I have read that we follow a time step of 1E-06 sec for steel with minimum element size of 5 mm. In my case the element size goes up to 1 mm. I have gone through the book "Crash Analysis with Radioss", according to which we have to look for two formulae to calculate the time step- one is elemental time step and the other is nodal time step. With an approximate sound speed of 5000 m/s through steel, I calculated the time step of 2E-07 sec [i.e., 1 mm / 5000 m per sec]. But I am not able to figure out how to calculate the nodal time step? Would somebody help me out with this? My question is - how much smaller time step would I require to take (for steel) in this case? [Please suggest me an optimum- rough estimate for the element size of 1 mm for steel by taking into consideration the nodal time step also].
  2. Deciding Element Size

    Recently I meshed a model, almost Rectangular block with size 850 X 200 X 200 with an element size of 10 and carried of analysis. After extracting stress values I again meshed the model with element size of 8. I observed that by changing the element size values(decreasing) my stress results were changing drastically and kept increasing. I was not able to conclude to a point and unable to decide the correctness of my analysis. How shall I decide element size?
  3. Quality Check

    How can we do quality check for large number of 3D elements? The quality check tool is under 2D panel and is for 2D elements. But for assembly with large number of 3D elements what is to be done?
  4. ELEMENT SIZE CRITERIA & QUALITY

    How do we decide the element size to be used for meshing? I have a cylindrical geometry of about 30 meters in diameter & 9 meters in height. After meshing, on what basis do we decide the threshold element size for quality checking in quality index?
  5. Hi !! how to find minimum , average , Max. element size of component when customer didn't give the details about.
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