|January 25, 2012, 10:08||
Adjusting velocity using cyclic bc's
Gregory N de Boer
Join Date: Dec 2011
Posts: 12Rep Power: 7
I have a question about the implementation of cyclic bc's using OpenFOAM.
I have a very simple case which is that of a non-conformal pipe geometry where flow is driven by a moving wall. The inlet of the pipe is smaller than at outlet but there is the same number of nodes on both faces.
I have been able to apply the fan bc such that there is a pressure change across my domain whilst the other field variables are modeled as true periodic (where the outlet and inlet are equal in size). But I wish to scale the velocity at outlet according to the distance between corresponding nodes on the inlet. That is:
p = p1 (calculated from the cyclic condition)
U = U1 (calculated from the cyclic condition)
p = p1+dp (dp is specified)
U = U1*(y2/y1) (y2/y1 is the scale factor)
I have been unable to find any derived class of the cyclic bc which seems capable of modeling this condition. Can anyone suggest how I may be able to implement such a condition? I have already looked into groovyBC but because it is a patch type rather than cyclic the solver does not maintain periodicity as required.
Another solution to my problem would be to transform unit vectors in the governing equations. But I doubt this can be done easily?
Any help with any of this would be much appreciated.
|cyclic, openfoam 2.0.x|
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