Fluids

Fluids

Turbulence model

    • Arunkumarmoovandan37
      Subscriber
      Which turbulence model is effective to calculate aerodynamic forces over a model?

      How to choose y+ values to get accurate results.

      Do I need to select y+ from post processing range of values.for example, in post processing y+ ranges from 0 to 4107. What should I need to use?
    • DrAmine
      Ansys Employee
      stick to default sst model. Yplus almost one and minimum of 15 to 20 cells across boundary layer.
    • Arunkumarmoovandan37
      Subscriber
      Does it mean than y+ should be 1 or else 15 to 20.??
    • DrAmine
      Ansys Employee

      no: y+ around 1 AND 15 to 20 cells in the boundary layers (minimum)

    • Arunkumarmoovandan37
      Subscriber
      While calculating the Reynolds number and first cell thickness do I need to consider the enclosure length or the model length.?
    • DrAmine
      Ansys Employee
      A length characteristic of your case. I never calculate it. I start from a good mesh then start a run to get the values and based on that I start refining. There are flat plate calculators to get yplus just use them and use both lengths for estimation
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