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-   -   Velocity Boundary Condition (urgent!) (https://www.cfd-online.com/Forums/openfoam-solving/97943-velocity-boundary-condition-urgent.html)

saba_saeb February 28, 2012 18:09
Velocity Boundary Condition (urgent!)
 
Hi Guys,

I have just started using OpenFoam to simulate a simple 2D channel flow and I faced problem in setting the appropriate boundary conditions. I am just aware of the pressure in inlet and outlet without having any idea about velocity values in these two points. I used "pressureDirectedInletOutletVelocity" and "pressureInletOutletVelocity", but these didn't work and I got strange results. Can anyone help me please with velocity boundary conditions in this case?

Tnx.

kmooney February 28, 2012 21:32
If you have a fixed deltaP boundary condition then a Von Neuman (zeroGradient) BC on velocity should be appropriate for channel flow.

saba_saeb February 28, 2012 21:38
Hi Kyle,

Tnx for your response. In the case that I am dealing with, there is a pressure gradient over time at inlet. Does zeroGradient work also under this condition?

kmooney February 28, 2012 21:40
From what I gather it should work. Give it a try!


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