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Velocity Boundary Condition (urgent!)

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Old   February 28, 2012, 18:09
Default Velocity Boundary Condition (urgent!)
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Saba Saeb
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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.
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Old   February 28, 2012, 21:32
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Kyle Mooney
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If you have a fixed deltaP boundary condition then a Von Neuman (zeroGradient) BC on velocity should be appropriate for channel flow.
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Old   February 28, 2012, 21:38
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Saba Saeb
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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?
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Old   February 28, 2012, 21:40
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From what I gather it should work. Give it a try!
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