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  3. When a fine near-wall mesh is created to achieve y+=1 for use with SST or k-w, what to do when rough walls are applied?

When a fine near-wall mesh is created to achieve y+=1 for use with SST or k-w, what to do when rough walls are applied?

Tagged: 18, cfx, fluid-dynamics, General - CFX, near-wall mesh, rough walls, sand grain, y+
    • June 5, 2023 at 7:05 am
      FAQFAQ
      Participant

      If you try to move nodes closer to wall to reduce y+ then you may not get exact y+ value needed. This is because, internally, the solver is using 0.5*sand grain height to determine the minimum y+. In such cases typically generate a mesh to achieve y+=1 for a smooth wall case, then apply wall roughness and don’t modify the mesh. Keywords: rough walls, sand grain

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