How to specify a timevarying nonuniform gradient of p at a patch

thomas · October 4, 2007, 10:08

Hello everyone,

I want to apply calculated values onto the gradient of p at a boundary patch. There are new values in every time step and they are non-uniform.

Apllying some values to p is quite simple, but how to specify values for the gradient at the boundary of a field?

Does anyone have a suggestion? Any help appreciated!

Many Thanks
Thomas

gschaider · October 4, 2007, 16:00

Hi Thomas!

If you need it at every time-step, you propably will have to program a boundary condition.

Have a look at $FOAM_SRC/finiteVolume/fields/fvPatchFields/derived/fixedFluxPressure (that boundary condition sets a pressure gradient, so it might give you an idea how to do it)

Bernhard

thomas · October 5, 2007, 02:02

Thanks very much Bernhard!

I will try it.

Thomas

October 4, 2007, 10:08	Hello everyone, I want to a	#1
thomas New Member Thomas Gallinger Join Date: Mar 2009 Posts: 28 Rep Power: 17	Hello everyone, I want to apply calculated values onto the gradient of p at a boundary patch. There are new values in every time step and they are non-uniform. Apllying some values to p is quite simple, but how to specify values for the gradient at the boundary of a field? Does anyone have a suggestion? Any help appreciated! Many Thanks Thomas

October 4, 2007, 16:00	Hi Thomas! If you need it a	#2
gschaider Assistant Moderator Bernhard Gschaider Join Date: Mar 2009 Posts: 4,225 Rep Power: 51	Hi Thomas! If you need it at every time-step, you propably will have to program a boundary condition. Have a look at $FOAM_SRC/finiteVolume/fields/fvPatchFields/derived/fixedFluxPressure (that boundary condition sets a pressure gradient, so it might give you an idea how to do it) Bernhard __________________ Note: I don't use "Friend"-feature on this forum out of principle. Ah. And by the way: I'm not on Facebook either. So don't be offended if I don't accept your invitation/friend request

October 5, 2007, 02:02	Thanks very much Bernhard!	#3
thomas New Member Thomas Gallinger Join Date: Mar 2009 Posts: 28 Rep Power: 17	Thanks very much Bernhard! I will try it. Thomas

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