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  3. For flows with volumetric forces (like gravity with temperature dependent density) velocity shows unphysical behavior at walls – vectors are pointing outwards through the wall, why?

For flows with volumetric forces (like gravity with temperature dependent density) velocity shows unphysical behavior at walls – vectors are pointing outwards through the wall, why?

Tagged: 16.1, fluent, fluid-dynamics, General, General - FLUENT, heattransfer
    • March 17, 2023 at 1:10 pm
      SolutionSolution
      Participant

      The standard scheme for spatial discretization is “second order” or “standard” (in older versions). These scheme is not appropriate for flows with e. g. natural convection (buoyancy driven flow). It can lead to vectors pointing through the upper walls instead of a flow parallel to the wall (see attached picture 2039992_Second_Order_Vectors.jpg in the upper left and right corner). Use PRESTO or Body Force Weighted instead (see 2039992_PRESTO_Vectors.jpg and 2039992_BFW_Vectors.jpg). WB project is also attached.

      Attachments:
      1. 2039992.zip
      2. 2039992_BFW_Vectors.jpg
      3. 2039992_PRESTO_Vectors.jpg
      4. 2039992_Second_Order_Vectors.jpg

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