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allways problems with ideal gas

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Old   March 31, 2006, 06:14
Default allways problems with ideal gas
Ralf Schmidt
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I am simulating turbulent gas flow at high temp (400 - 1000 K) and high pressure (10 - 20 bar). When I turn on ideal gas law, I have allway problems with the floating point error.

The same sim. with incomp. ideal gas is working very well.

What are the best settings for ideal gas?? what solver is the best (i am using seg.)? What is the best vel-pressure couling sheme? are there other factors (urf,...)???

Any help is highly appreciated!!

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Old   March 31, 2006, 10:35
Default Re: allways problems with ideal gas
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Never use ideal-gas law unless u really need it. If u really need it decrease the density urf (0,2-0,5) the pressure URF (0.05-0.2) and the momentum URF (0.4-0.6). For the p-v coupling start with the SIMPLE.

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