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Relative pressure in compressible flow

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Old   June 19, 2015, 00:08
Unhappy Relative pressure in compressible flow
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Let say the domain reference pressure is 1 atm (atmospheric pressure). May I know the input value of relative pressure if I change the flow from subsonic to supersonic (k-epsilon model)? Is it equals to 0 Pa or pressure of that particular equipment during release?
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Old   June 19, 2015, 06:36
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It depends on the flow configuration, so your question is unanswerable. It sounds like you need to do some reading about compressible flow as your question is probably a standard compressible flow equation.

Also the reference pressure is used to reduce numerical round off errors in the simulation. It tells you nothing about the flow conditions.
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