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-   -   Modeling Laval nozzle, subsonic flow to supersonic (http://www.cfd-online.com/Forums/cfx/24136-modeling-laval-nozzle-subsonic-flow-supersonic.html)

Bloshchitsyn Vladimir June 18, 2007 00:23

Modeling Laval nozzle, subsonic flow to supersonic
 
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)


Dr. Flow Squad June 18, 2007 02:38

Re: Modeling Laval nozzle, subsonic flow to supers
 
Total Energy and Ideal gas air. The density varies a lot.

Gert-Jan June 18, 2007 05:18

Re: Modeling Laval nozzle, subsonic flow to supers
 
There is a quite good tutorial for a laval nozzle with supersonic outlet........

Gert-Jan


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