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Home Forums ANSYS Fluent Beginners to Advanced level Fluent Meshing: Describe Geometry

  • Fluent Meshing: Describe Geometry

    Posted by SIVARAMAN on March 9, 2024 at 4:37 pm

    Hi,
    In describe geometry section,
    Change all fluid-fluid boundary types from ‘wall’ to ‘internal’.
    When do we need to select ‘yes’ option. I assumed, all internal flow conditions, it should be enabled. It seems I am wrong.
    Could you please explain for better understanding.

    Thank you,
    Sivaraman Kandasamy.

    SIVARAMAN replied 1 month ago 2 Members · 6 Replies
  • 6 Replies
  • MIDHUN

    Member
    March 12, 2024 at 9:58 am

    Hi,

    We use boundaries from wall to internal if there a fluid to fluid interface and you need interpolation or else will go with convert to walls .

    Regards

    Flowthermolab SupportTeam

    • SIVARAMAN

      Member
      March 12, 2024 at 1:12 pm

      Hi,
      In globe valve case, we chose ‘No’ when describing the geometry. Here also we have fluid-fluid interface, then why did not we choose ‘Yes’.
      Previously, for mixer geometry, we enabled ‘Yes”. Globe valve also have a similar kind of profile and operation, but we chose ‘no’.

      Could you please explain.

      Thank you,
      Sivaraman Kandasamy.

      • MIDHUN

        Member
        March 12, 2024 at 1:36 pm

        Hi

        In the external aerodynamics problem we had for the aeroplane (where we gave share topology in spaeclaim) so we need to give yes for converting walls to internal . But in globe valve we have only fluid solid interface and no fluid fluid interface .So we give No (that is no need to convert internals to wall).

        Iam not clear with fluid fluid interface in globe valve can you please share a screen of that.

        FlowthermolabSupportTeam

        • SIVARAMAN

          Member
          March 12, 2024 at 1:46 pm

          Hi,
          I have attached the globe valve cross section and mesh images for your reference.
          I assumed, since flow is happening inside the wall, we had to chose wall to internal.

          Thank you,
          Sivaraman Kandasamy.

          • This reply was modified 1 month ago by  sivaramandk.
  • MIDHUN

    Member
    March 12, 2024 at 2:00 pm

    Hi

    Here you can see here there is only a single passage and we are not having any fluid to fluid interface .

    Whereas if you check the mixer you have multiple inlets and its getting the main domain and in between also you have a annular space through which fluid is flowing so in that even though its single fluid domain we need to use walls to internal option. Similarly in the external flow case there is multiple fluid domains and a common face is shared so in that case of we need to use convert walls to internal .But for the valve its a single passage .

    Regarding the mixer case hope we had also talked this aspects in the weekend sessions .Hope the concept is clear for choosing walls to internal we need to check like are there any branches or fluid fluid interface is there in that case we need to go with this option it does not matter if its internal or external flow its mainly to ensure no blockage of flow should occur when there is a fluid fluid interface is there.

    Regards

    FlowthermolabSupportTeam

    • SIVARAMAN

      Member
      March 12, 2024 at 2:20 pm

      Hi,
      Now it is clear. Thank you.😇

      Regards,
      Sivaraman Kandasamy.

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