Fluids

Fluids

How to switch off a velocity inlet

    • Vinwang
      Subscriber

      Hi all, I'm running a simple 3d transient case with a velocity inlet from the bottom. I would like to stop the inlet after 0.2 s and then run the simulation for about 10 s. I made 2 attempts:

      change the inlet velocity magnitude to 0 after 0.2 s

      change the bc type of the inlet to wall after 0.2 s

      After both actions, the solver has difficulties in convergence in temperature. Please can anyone help with the problem, thanks in advance.


      Vin

    • aitor.amatriain
      Subscriber
      Your profile is a Heaviside step function. In order to help convergence, you could approximate it as a sigmoid with a custom level of smoothing. Of course, this has to be done with expressions or UDFs.
    • Vinwang
      Subscriber

      Hi Aitor, thanks a lot for your reply. Gonna try to set the magnitude as a sigmoid expression.
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