Neumann Pressure Boundary Condition with UDF
Dear all, I wonder if someone is able to give me an UDF coding example to force a Neumann b.c. to the pressure field on a pressure outlet, I mean:
dp/dn = 0 where n is the normal of a "pressure outlet" b.c. Thanks for your attention. Balder |
Hello,
I am stuck with the same problem except the fact that I want to implement du/dx=0 for a laminar pipe flow at the outlet(fully developed condition). Have you got any work around for your problem so far? |
Even I've the same problem, haven't got much help, how about you guys. The average static pressure=0 is the nearest matching BC. But I am not sure whether it serves any purpose.
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Why do'nt you use an outflow bc (if u dont have backflow)? this bc sets both dp/dn=0 and dv/dn=0 automatically. if you have backflow through your boundary, then these Boundary Conditions make the problem ill-posed.
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Maintaining static pressure=0 will get you the neumann boundary condition.
I confirmed it with the Ansys CFX tech people. thank you all..! |
I have the same problem with Temperature at the inlet for compressible flow.
adiabatic: dT/dx=0 |
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IDo you meant CFX or FLUENT?:rolleyes: |
I have written the UDF for convective B.C using DEFINE_PROFILE.....Can any1 tell me how to apply it at the outlet?
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