3 Replies Latest reply on Apr 24, 2008 3:41 PM by Ben Floan

    Which solver should i use

    Ranga Narasimhan
    Ranga Narasimhan May 14, 2007 3:53 AM
      hi,

      i really have no idea which solver should i use. some say its better to use direct sparse on large displacement problems.

      can anybody tell me all the features as well as DO's and DONT's with those.

      thanks
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        • Which solver should i use
          1-6IQYAK May 14, 2007 8:06 AM (in response to Ranga Narasimhan)
          dear ranga,
          for Static Problems:
          we can use Direct Sparse solver, and the FFE solver.
          1. we can Use the FFE solver for large and very large problems (problems with over 300,000 DOF).
          2.Use the Direct Sparse solver for small and medium problems (problems with 100,000 to 300,000 DOF).
          3. Use the Direct Sparse solver for assembly problems with contact, especially
          when you turn on the friction effects.
          4. Use the Direct Sparse solver when solving assemblies of parts with widely
          different material properties.
            • Which solver should i use
              Ben Floan
              Ben Floan Apr 24, 2008 3:41 PM (in response to 1-6IQYAK)
              Jeya,

              Any documenatation that you would recommend which details information about specific solvers. I was having the same question until I came accross your post. It would be helpful to know specific advantages of different solvers.

              Regards,
            • Which solver should i use
              Peter Gillespie
              Peter Gillespie May 14, 2007 12:52 PM (in response to Ranga Narasimhan)
              One thing I would recommend is to run a study with each solver and see which one is faster. Of course, as Jeya mentioned, it will depend on some factors, but for our studies (100,000-200,000 DOFs typically), the direct sparse is much faster because it takes advantage of the Core2Duo processor. I'm not sure in the latest versions if the other solvers support multi-core processing, but it's nice to have the Direct sparse solver.

              I would also recommend doing a search for COSMOS companion and watching Vince's presentation about the subject. It has helped me understand a lot better.