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Old   May 13, 2005, 07:59
Default pressure correction
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Hi everybody. I have a quastion about my code.I simulate compressible unsteady turbulent flow and I want to ask you exactly how I implement the pressure correction (SIMPLE-like algorithm for compressible flow).What is the difference with the pressure correction in incompressible flow? Thank you!
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Old   May 13, 2005, 08:37
Default Re: pressure correction
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You will need to incorporate the variation of density with pressure in the continuity equation, i.e. the pressure correction you solve for will be a function of the velocity perturbations and density fluctuation. This is usually done by appealing to the thermodynamic relation rho = rho(p,h) and assuming the enthalpy is fixed during the outer iterations so that one can approximate drho/dt ~ (drho/dp)*dp/dt. In addition, the enthalpy equation is solved along with the momentum equations to give approximations to (u,v,h). Then the pressure correction equation is solved and the quantities are updated as appropriate. More on this can be found in Peric and Ferziger, pp. 278-287.
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Old   May 21, 2005, 12:47
Default Re: pressure correction
Larry Clark
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In my program I found that upwinding the pressure and density using the Mach number helped greatly with the stability of the method. It added to the calculations but it is worth it. Otherwise I did just what the previous comment suggested.
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