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Pressure waves bouncing in domain, proper BC's

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Old   June 13, 2017, 05:12
Default Pressure waves bouncing in domain, proper BC's
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Hey,

I am simulating a 3-D backward facing step problem cold flow using compressible XiFoam solver. I have a long inlet so in order to develop turbulence easily I perturbate my initial flow with perturbU utility and then use mapped inlet for k and U variables at the inlet. However, after 1 pass I start getting pressure waves bouncing around in the domain, which later evolves into checkerboard pressure field.

I am using wavetransmissive boundary condition for pressure at the outlet and zerogradient elsewhere. Do you have any idea how to prevent this waves from occurring?
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File Type: png finalU.png (129.7 KB, 23 views)
File Type: png finalp.png (91.7 KB, 26 views)
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