Which boundaries should I use
Which boundaries should I use to model velocity distribution in a pipe?
I believe I need 'fixedValue' for pand U in the inlet, and 'calculated' at the outlet, but thats not working. Is there any further documentation for the 'calculated' boundary?
Not a particularly good locati
Not a particularly good location for this thread, but never mind :-)
The "calculated" boundary condition is just a place-holder for the situations where the code does not know what to do - for example when you are calculating a gradient of the field and you're not sure what the boundary conditions for that field should be. Also, you cannot specify both p and U at the same location for incompressible flows.
In your case, the appropriate set of b.c.-s are fixedValue U and zeroGradient p at the inlet and zeroGradient U and fixedValue p at the outlet.
Have a look at the tutorials, for example tutorials/simpleFoam/pitzDaily
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