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Old   November 23, 2004, 15:17
Default Problem using ideal gas
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mark
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I am running a heat transfer problem and trying to implement the ideal gas equation to model my density. I am using rke two layer model for turbulence. When I use constant density or even incompressible ideal gas, the solution converges nicely in less than 2000 iterations. However, as soon as the ideal gas is chosen, the solution limits the pressure (regardless of what range of pressure values I use). Has anyone else experienced a similar problem?

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Old   November 24, 2004, 04:32
Default Re: Problem using ideal gas
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ROOZBEH
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Hi; For compressible calculations, it is better to choose "Coupled" solver not "Segregated". Then you should start calculations with a very low courant number in solution panel (for example .001). After several iterations, you can increase courant number to 0.5 or ..., slowly(.001 then .005 then .01 and ...). Hope this help you. ROOZBEH
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Old   November 24, 2004, 07:07
Default Re: Problem using ideal gas
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nabeel mohsin
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hi have you selected energy equation to solve nabeel
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Old   November 29, 2004, 17:40
Default Re: Problem using ideal gas
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yes, I am using the energy equation
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