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-   -   convert compressible flow into incompressible flow (http://www.cfd-online.com/Forums/main/6420-convert-compressible-flow-into-incompressible-flow.html)

Hun Jung August 6, 2003 12:21

convert compressible flow into incompressible flow
 
Hi! everyone...

I have 3d compressible flow cfd code.I would like to convert compressible into incompressible flow with my code. I have been fixed density. but, It's different result with experimental one. I wonder what i am consider condition?

reader August 6, 2003 22:45

Re: convert compressible flow into incompressible
 
Explain please in more details how you find pressure (before and now)?

Hun Jung August 7, 2003 02:58

Re: convert compressible flow into incompressible
 
Thank for your response!!!

I'm using finite volume method of simple algorithm. My codes gives velocity inlet profile.

The pressure is conducted by the initial guess value of the inlet velocity as general simple method.

During the converting compressible flow into incompressible one, I'm not adjusting pressure term.

I have a question. When the inlet velocity profile is given, the remark mentioned above,does it directly has the inside and outlet velocity? otherwise, after iteration, does it has the outlet velocity by means of pressure?

Tom August 7, 2003 03:03

Re: convert compressible flow into incompressible
 
Hi,

If you are using a compressible code and you want to simulate an incompressible flow you have to decrease the Mach number, Mach=0.2 works probably. You can not take the density as a constant in a compressible code.

Tom

Puma August 11, 2003 10:10

Re: convert compressible flow into incompressible
 
use artificial compressible method(ACM) to do these job


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