OpenFOAM discrete BC

doubtsincfd · May 10, 2011, 17:09

Is it possible to give boundary values at discrete points on boundary patch?

Bernhard · May 11, 2011, 02:36

The whole problem is already discretized, can you be more specific?

groovyBC and swak4Foam are probably libraries that you can use for your specific needs.

doubtsincfd · May 11, 2011, 02:55

Lets say at inlet I want to specify 100 values of U at 100 grid points. The U values may or may not be analytical.

A specific case can be parabolic velocity at inlet. But in my case, I don't know any such analytic function. All I have is u,v,w values for x,y,z coordinates of cell centers in the patch.

How can I implement such a BC?

Meanwhile I will have a look at groovyBC and swak4Foam also.

Thank you for the help!

Bernhard · May 11, 2011, 03:12

groovyBC is just a predecessor of swak4Foam, you can use it if you have nice analytic expression for the BC in known variables.

If you have raw data, you can give that as a boundary condition in the form of a list. I don't know the exact syntax, but it is pretty straightforward.

May 10, 2011, 17:09	OpenFOAM discrete BC	#1
doubtsincfd Senior Member Join Date: Nov 2009 Location: Michigan Posts: 135 Rep Power: 16	Is it possible to give boundary values at discrete points on boundary patch?

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May 11, 2011, 02:36		#2
Bernhard Senior Member Bernhard Join Date: Sep 2009 Location: Delft Posts: 790 Rep Power: 21	The whole problem is already discretized, can you be more specific? groovyBC and swak4Foam are probably libraries that you can use for your specific needs.

May 11, 2011, 02:55		#3
doubtsincfd Senior Member Join Date: Nov 2009 Location: Michigan Posts: 135 Rep Power: 16	Lets say at inlet I want to specify 100 values of U at 100 grid points. The U values may or may not be analytical. A specific case can be parabolic velocity at inlet. But in my case, I don't know any such analytic function. All I have is u,v,w values for x,y,z coordinates of cell centers in the patch. How can I implement such a BC? Meanwhile I will have a look at groovyBC and swak4Foam also. Thank you for the help!

May 11, 2011, 03:12		#4
Bernhard Senior Member Bernhard Join Date: Sep 2009 Location: Delft Posts: 790 Rep Power: 21	groovyBC is just a predecessor of swak4Foam, you can use it if you have nice analytic expression for the BC in known variables. If you have raw data, you can give that as a boundary condition in the form of a list. I don't know the exact syntax, but it is pretty straightforward.