Fluids

Fluids

overset mesh physical boundaries overlap

    • hitamin
      Subscriber

       


      Hello,


      I have a question regarding using overset interfaces along with overlapping (coinciding) walls in 3D.


      I’m trying to simulate the flow field around a rocket by importing three meshes (background mesh, payload fairing mesh, and the body mesh) into Fluent 19.2.


       


      When I create the overset interface between the fluid domain and overset components (fairing + body), I end up with thousands of orphan cells (fig. 1).


       


      I tried to import the oversets components separately (figs. 2 & 3) and it looks to work out without a single orphan cell.


       


      Also, “Display-cells” command remains invalid even after I mark the orphan cells in a register. This prevents me to visualize the orphan cells location.


      If I run the calculations anyway, Aerodynamic forces will remain zero for the whole calculations.


       


      Is there any missing treatment for the walls’ connection?


      Any help would be greatly appreciated!


      Best regards,


      Amin


       


    • DJERRAD
      Subscriber

      I have no idea with this problem, maybe other members will help you.

    • hitamin
      Subscriber

      I appreciate it, thank you DJERRAD

    • hitamin
      Subscriber

      still no suggestion !!!

    • mese
      Subscriber
      I wonder if you have got your answer by now, but I give you my thoughts.nFirst of all, from your figures, figure 1 is not the result of appending figures 2 and 3 at the positions shown on figures 2 and 3. The Fairing overset has had a motion to th left and the body overset to the right, ya? nAnyway, the background mesh does not have any overlapping wall with any wall of your components individually. This is why when only one component is appended, you don't have any orphan cell. However, the fact that you see orphan cells suggests that the two component meshes produce narrow spaces between their wall when they are appended to the background. If there are not sufficient cells between walls, orphan cells are generated. n n
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