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Old   August 22, 2005, 05:26
Default Reimann Invariants
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Can reimann invariants be used for supersonic inlets and outlet. I am news to using it, any guidance would be help. The paper I have refered says it is suitable for subsonic cases, please guide.


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Old   August 22, 2005, 06:58
Default Re: Reimann Invariants
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Yes as long as isentropic assumption is valid Riemann invariants can be used. However if any of the outlet or the inlet have shocks cutting across, this condition doesnot hold good( e.g. under expanded super sonic jets) and then you have to revert to supersonic inlet and outlet boundary conditions based on direction of information propagation.

Hope this help you.

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Old   August 23, 2005, 13:31
Default Re: Reimann Invariants
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Determine the velocity on your boundary. Then check is it inlet or outlet boundary and subsonic or supersonic is it. Now you know how many riemann invariants you need on this boundary. Apply suitable conditions.

Good luck,

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