Modeling Laval nozzle, subsonic flow to supersonic

June 18, 2007, 01:23

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)

June 18, 2007, 03:38

Total Energy and Ideal gas air. The density varies a lot.

June 18, 2007, 06:18

There is a quite good tutorial for a laval nozzle with supersonic outlet........

Gert-Jan

June 18, 2007, 01:23	Modeling Laval nozzle, subsonic flow to supersonic	#1
Bloshchitsyn Vladimir Guest Posts: n/a	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)

June 18, 2007, 03:38	Re: Modeling Laval nozzle, subsonic flow to supers	#2
Dr. Flow Squad Guest Posts: n/a	Total Energy and Ideal gas air. The density varies a lot.

June 18, 2007, 06:18	Re: Modeling Laval nozzle, subsonic flow to supers	#3
Gert-Jan Guest Posts: n/a	There is a quite good tutorial for a laval nozzle with supersonic outlet........ Gert-Jan

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