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Fault tolerant meshing – polyhedra elements

    • simone01
      Subscriber

      Hello,


      I am using fluent meshing to make the mesh, I found myself very well using Watertight geoometry for the previous geometries, unfortunately I can't use it for the current geometry (I have to simulate the rotation of the impellers in a mixing tank, I'm using the MRF approach so I don't have a clean geometry) I am therefore using the Fault tolerant meshing.


      Using watertight geometry on the surfaces of my geometry the polyhedra elements are applied by default, with Fault tolerant meshing the tetrahedra elements instead. Is it possible to mesh the surface with polyhedra elements with Fault Tolerant Meshing?


      Thank you


      best regards

    • Rob
      Ansys Employee

      Fluent Meshing always uses tri mesh when doing the initial surface meshing. When you mesh the volume it remeshes using poly cells. If you have tri cells at the end of the fault tolerant workflow you may have missed a setting. 


      No reason why you can't use watertight with impellers with mrf zones. You just need to be careful with the zone definitions. If you want sliding mesh, you could build two models. Look up "append mesh" in Fluent. 

    • simone01
      Subscriber
      Thanks for the reply.
      Then I'll try again using watertight. The problem is that in update boundaries I detected the rotating zone of the impeller and the void of the impeller, but it did not detect all the volume outside the rotating zone. So would you suggest me to do two separate models (for the rotating zone and for the rest of the tank volume) and import them into fluent meshing for the MRF approach? Thank you
      Best regards
    • Rob
      Ansys Employee

      It should pick up both fluid and the single void zones. If that doesn't work you can try two meshes but not they'll not be conformal in Fluent (read up on mesh interface zones). 

    • clmr90
      Subscriber

      The same happened to me although with a case of wheel rotation (the zone inside was detected but not the rest of the control volume).  Sadly no solution yet, Hopefully you will find a solution too.

    • Rob
      Ansys Employee

      Have you labelled the surface between the two volumes? Did you label the volumes in SpaceClaim? 

    • clmr90
      Subscriber

      Hi rwoolhou.


      I did, I´ll show you the picture. Also I renamed the volumes in Spaceclaim.


    • Rob
      Ansys Employee

      Did you use ShareTopology? 

    • clmr90
      Subscriber

      Indeed, but the strangely the zones (the faces of both interfaces) appeared merged  as you can see in the picture below:


    • johan_betancour
      Subscriber
      Hello, did you get a solution to this problem?nI need to simulate the rotation of a turbine and I'm trying to use advantages of the watertight workflow, but fluent's manual says I can't make a non conformal mesh with that workflow. Could I get a non conformal mesh with the Fault tolerant workflow?nThanks for your help.n
    • Rob
      Ansys Employee
      No, but if you check the other thread there are options. https://forum.ansys.com/discussion/comment/92617#Comment_92617n
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