Fluids

Fluids

How to convert the boundary condition of mass flow inlet of 3d model to that of 2D model

    • hmily
      Subscriber

      With ideal air as the medium, when the flow inlet conditions of the three-dimensional model are directly assigned to the two-dimensional model, the simulated gas velocity is much smaller than that of the three-dimensional calculation. Excuse me, how to give a correct boundary condition of mass flow entrance in a two-dimensional model.Thank you!

    • Rob
      Ansys Employee
      That depends. In 2d we assume the domain is 1m thick so you can scale the mass flow to ensure you add enough mass, but the velocity may not agree with the 3d case. Or you can calculate the velocity in 3d and use that boundary condition, but the mass flow may not agree with the 3d case.
      With 2d you're making an assumption about the domain, and therefore flow. If the mass (or velocity) doesn't tie up is the 2d assumption really valid?
    • hmily
      Subscriber

    • hmily
      Subscriber
      Your answer is very helpful. Thank you very much´╝ü
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