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Implementation of nonreflecting boundary conditions

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Old   March 12, 2008, 06:45
Default Hello! Does anyone have a r
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Henrik Nordborg
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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
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Old   March 12, 2008, 11:04
Default Henrik, I don't know of much
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David P. Schmidt
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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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