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periodic boundary and compressible flow

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Old   June 4, 2008, 07:47
Default periodic boundary and compressible flow
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Can I use periodic boundary for compressible flows. When I choose translational periodicity which is appropriate model for my plane channel case problem i get a following message in CFX-Pre.

"A mass and momentum model can be set for periodic domain interfaces only if all fluids have constant density". How can I use periodic BC for compressible flow then? Thank you
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