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-   -   buoyantBoussinesqPisoFoam and buoyantBoussinesqPimpleFoam (http://www.cfd-online.com/Forums/openfoam/80839-buoyantboussinesqpisofoam-buoyantboussinesqpimplefoam.html)

poplar October 8, 2010 06:34

buoyantBoussinesqPisoFoam and buoyantBoussinesqPimpleFoam
 
Hi,everyone.

In 1.6.x, buoyantBoussinesqPisoFoam can perform unsteady RANS as well LES. In 1.7.x, though buoyantBoussinesqPimpleFoam cannot perform LES, I modified it to do LES with the same manner of buoyantBoussinesqPisoFoam, so now the modified buoyantBoussinesqPimpleFoam can perform LES also.

The problem is, using the same time step for my LES, buoyantBoussinesqPisoFoam can give a well-looking result, but buoyantBoussinesqPimpleFoam carry out strange results after several seconds. I know buoyantBoussinesqPisoFoam using p but buoyantBoussinesqPimpleFoam using p_rgh=p-rho*g*h. Why don't they give the same rusult? Should I modify it to use p_rgh=p-rho_0*g*h? It seems a constant rho_0 is often used rather than rho?


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