4 Replies Latest reply on Apr 10, 2013 2:03 AM by Park Sang-Hyun

    Is it a bug in the SolidWorks program?

    Park Sang-Hyun

      I am sorry.
      My English is poor.
      I have received the help of translation Google.

       

      Two models, the conditions are the same for all. (Dimensions, mesh ...)

       

      but, I changed only impeller.

       

      However, a problem occurs in the pressure.

       

      Power problems, customs, until the pressure for efficiency.

       

      The same phenomenon occurs even when viewed from the beginning.

      All of the same phenomenon occurs SW2012 Sp5.0 & SW2013 Sp2.0.

       

      What is the problem?

       

      Is it a bug in the SolidWorks program?

       

      1.jpg

       

      2.jpg

       

      ---------- Add -------------

      Not in the direction of the wind through the Local Mesh Part?

      1.jpg

       

        • Re: Is it a bug in the SolidWorks program?
          Jared Conway

          You are on the current version of the software, have you reported it to your reseller?

           

          Firs thought is to check your inputs and your outputs. If you use parameters rather than goals, do you get the same values? What happens when you compare cut plots of velocity?

           

          If you remove the changes , do you get the same output as before?

           

          These are the types of things we would try on tech support.

           

          If you can post the files, we'll have a better chance of solving the problem.

            • Re: Is it a bug in the SolidWorks program?
              Park Sang-Hyun

              Sir.

               

              Theoretical calculations must leave the same results.
              However, in the case of the simulation, the value of the result is different.

               

              Why not?

              1 Inlet Lid-> Total pressure [Pa] Outlet Lid -> Mass Flow [kg / s]
                    Result = total Pressure & Static Pressure = geometric Zoom

              2.Inlet Lid-> Mass Flow [kg / s] Outlet Lid -> Total pressure [Pa]
                     Result = total Pressure & Static Pressure = Normal

               

               

                • Re: Is it a bug in the SolidWorks program?
                  Jared Conway

                  Please post your references/theoretical calculations if that is what you are comparing to. Please highlight how your simualtion setup matches them along with your assumptions for both.

                   

                  That being said, in your first post you said everything stayed the same except for be impeller. In your latest, you say that you changed the boundary conditions. If you changed conditions, I would check they are the same at the end of the solution using goals or parameters. Your choices don't look equivalent to me.

                   

                  Also, if you haven't done so, I would recommend looking at the rotation suggestions in the swx kb and solving engineering problems docs. Mass flow out is Generally not recommended.