Implementation of nonreflecting boundary conditions

nordborg · March 12, 2008, 06:45

Hello!

Does anyone have a reference to the implementation of the non-reflecting boundary conditions in OpenFOAM? I did not managed to find it in the manuals.

Best regards,
Henrik

schmidt_d · March 12, 2008, 11:04

Henrik,
I don't know of much documentation on this subject for OF. I can tell you a little bit.

OF 1.3 had pressureTransmissive BC's that were a simple method for letting both the value and gradient of pressure at a BC vary around a specified far-field value. pressureTransmissive used a "lever-law", if memory serves.

In OF 1.4, pressureTransmissive was dropped in favor of waveTransmissive. The waveTransmissive BC is templated and can thus be used with basically any type of field. There is a wiki page about using waveTransmissive, but no derivation of the equations.

For a truly non-reflecting BC, like Poinsot and Lele or Thompson, I don't know of any existing implementation. It could be done, however...

David

March 12, 2008, 06:45	Hello! Does anyone have a r	#1
nordborg New Member Henrik Nordborg Join Date: Mar 2009 Posts: 3 Rep Power: 18	Hello! Does anyone have a reference to the implementation of the non-reflecting boundary conditions in OpenFOAM? I did not managed to find it in the manuals. Best regards, Henrik

March 12, 2008, 11:04	Henrik, I don't know of much	#2
schmidt_d Member David P. Schmidt Join Date: Mar 2009 Posts: 72 Rep Power: 18	Henrik, I don't know of much documentation on this subject for OF. I can tell you a little bit. OF 1.3 had pressureTransmissive BC's that were a simple method for letting both the value and gradient of pressure at a BC vary around a specified far-field value. pressureTransmissive used a "lever-law", if memory serves. In OF 1.4, pressureTransmissive was dropped in favor of waveTransmissive. The waveTransmissive BC is templated and can thus be used with basically any type of field. There is a wiki page about using waveTransmissive, but no derivation of the equations. For a truly non-reflecting BC, like Poinsot and Lele or Thompson, I don't know of any existing implementation. It could be done, however... David

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