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supersonic pressure?

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Old   December 19, 2001, 04:38
Default supersonic pressure?
  #1
Giacomo
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Hallo,

I'm trying to analyse a simply convergent nozzle. I do not know if the flow becomes supersonic (probably no, ptot-in is 1.5*ptot-out).

I would like to know what is supersonic pressure in pressure inlet boundary condition and how I can estimate it.

Thank you very much

Giacomo

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Old   December 20, 2001, 17:20
Default Re: supersonic pressure?
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petra
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In my opinion, supersonic initial gauge preesure is used for initilazation under solve initialize. And in case of a closed supersonic area in the flowfield, where the information from the outlet can not go back to the inlet, it is used as staic pressure at the inlet.
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Old   December 20, 2001, 19:05
Default Re: supersonic pressure?
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jim clancy
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For convergent nozzle the flow will not be supersonic, by using the compressible flow tables of 1D flow you might estimate the Mach number according to the contraction ratio..good luck.
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