Top-free surface boundary condition

- November 8, 2019 at 7:31 pm
  
  cs437
  Subscriber
  
  Hi,
  
  I read papers about free surface; however, I found two types of boundary conditions should be set are pressure-outlet boundary condition and wall with zero shear stress. I tried both cases in the simulation. As far as I have done, the torque values are similar; however, the reducing of the iterations are different. Could anyone tell me which is more appropriate boundary condition if the problem is about free surface on the top of a geometry?
  
  Best regards,
- November 9, 2019 at 6:23 pm
  
  DrAmine
  Ansys Employee
  
  Free slip wall is a simplification of applied direct at free surface. Ideally one would have a buffer above the free surface and pressure boundary at the top. If one enlarges domain
- November 9, 2019 at 6:23 pm
  
  DrAmine
  Ansys Employee
  
  Then one can apply a symmetry or free slip wall.
- November 10, 2019 at 3:29 am
  
  cs437
  Subscriber
  
  Hi,
  
  Sorry, could you clarify "one" and its explanation?
  
  Thank you.
- November 10, 2019 at 10:05 am
  
  DrAmine
  Ansys Employee
  
  It you put enough place above the free surface one can think abiut using symmetry bc.

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