|January 25, 2012, 10:08||
Adjusting velocity using cyclic bc's
Gregory N de Boer
Join Date: Dec 2011
Posts: 12Rep Power: 5
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|
|Thread||Thread Starter||Forum||Replies||Last Post|
|Cyclic bc. and overlapGgi||Pekka||OpenFOAM||12||February 15, 2012 08:10|
|Cyclic BCs using createPatch in OF 1.6.x||SunnyPP||OpenFOAM||2||August 6, 2010 10:21|
|how to compute relative velocity from absolute?||spk||Main CFD Forum||3||July 9, 2010 08:42|
|Velocity in Porous medium : HELP! HELP! HELP!||Kali Sanjay||Phoenics||0||November 6, 2006 07:10|
|Transient Velocity BCs||Chris Morgan||Main CFD Forum||1||May 13, 1999 15:19|