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flow properties

Posted Jun 25, 2012, 9:31 a.m. EDT Fluid & Heat, Materials, Modeling Tools & Definitions, Parameters, Variables, & Functions Version 4.2a 0 Replies

Tilmann John
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Hi,

I simulate the flow of ideal gas through a channel with changing crss section using the High Mach Number Flow Model.
In the Inlet settings I have to specify the total temperautre, the total pressure and the Mach number.
In the Initial Values settings I have to specify again the temperature, the pressure and the velocity field.
So I wonder why I have to specify the Mach Number AND the velodity field. The Mach number should be Ma= u/a (a=sonic speed). So why does Comsol need both? How does it calculate the velocity field at the end? I can't find the formulas in the guide.
0 Replies Last Post Jun 25, 2012, 9:31 a.m. EDT
COMSOL Moderator

Hello Tilmann John

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