# Problem using ideal gas

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 November 23, 2004, 15:17 Problem using ideal gas #1 mark Guest   Posts: n/a 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?

 November 24, 2004, 04:32 Re: Problem using ideal gas #2 ROOZBEH Guest   Posts: n/a 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

 November 24, 2004, 07:07 Re: Problem using ideal gas #3 nabeel mohsin Guest   Posts: n/a hi have you selected energy equation to solve nabeel

 November 29, 2004, 17:40 Re: Problem using ideal gas #4 mark Guest   Posts: n/a yes, I am using the energy equation

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