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Modeling Laval nozzle, subsonic flow to supersonic

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Old   June 18, 2007, 00:23
Default Modeling Laval nozzle, subsonic flow to supersonic
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Bloshchitsyn Vladimir
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Hello! I try simulate Laval nozzle... I use Air at 25C(Isotermal)... pressure difference - 1 amt... and CFX return very big velosity, more than 1000 m/s! How fix this problem?

Some questions: 1) What's BC i should use? Supersonic or subsonic flow 2) What's thermal condition? (Isotermal, Thermal Energy, Total energy)

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Old   June 18, 2007, 02:38
Default Re: Modeling Laval nozzle, subsonic flow to supers
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Dr. Flow Squad
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Total Energy and Ideal gas air. The density varies a lot.
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Old   June 18, 2007, 05:18
Default Re: Modeling Laval nozzle, subsonic flow to supers
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Gert-Jan
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There is a quite good tutorial for a laval nozzle with supersonic outlet........

Gert-Jan
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