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Problem with acoustic wave calculation

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Old   June 5, 2014, 10:28
Default Problem with acoustic wave calculation
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Claas Knoop
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Hi everybody,

I have trouble calculating an acoustic standing wave using the compressible rhoPisoFoam solver (OF1.7). I use a 3 dimensional domain with a periodic velocity inlet at one side and a reflecting wall boundary at the opposite side. For the remaining sides I use a waveTransmissive boundary for the pressure (please see the attached boundaries-gif for details).

The simulation converges nicely and the resulting pressure and velocity distributions show qualitatively the right behaviour. However, the total pressure in the domain increases with increasing calculation time (see attached results file). So, something is obviously wrong with the boundary configuration I use. I played around with different configurations, without finding a satisfying one.

Has anyone of you an idea how to correctly set the boundaries? Any help is much appreciated!

cheers claas
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File Type: gif boundaries.gif (21.8 KB, 57 views)
File Type: gif results.gif (39.9 KB, 46 views)
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Old   June 11, 2014, 04:07
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Claas Knoop
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Nobody ... ?
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Old   January 28, 2015, 13:56
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Jim
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Hi,

Looking at your atmospheric and inlet BC's, have you tried the following:

atmospheric BC - change U and T to waveTransmissive

inlet BC - change p and T to waveTransmissive
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acoustics, incompressible flow, rhopisofoam

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