# Enclose equation in simplefoamget another result

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 March 9, 2009, 06:08 Hi OpenFoam experts, is it #1 Member   Join Date: Mar 2009 Posts: 35 Rep Power: 10 Hi OpenFoam experts, is it a difference for openFoam or get another results, if for example I write in simpleFoam-case solver ... tmp UEqn ( fvm::div(phi, U) + turbulence->divR(U) + fvc::grad(p) ); UEqn().relax(); solve(UEqn() == 0);// change ... instead of ... tmp UEqn ( fvm::div(phi, U) + turbulence->divR(U) ); UEqn().relax(); solve(UEqn() == -fvc::grad(p)); ... I suppose i get another result, if i view the flows in paraFoam. Regards, Khaled

 March 9, 2009, 06:15 Actually what you have done he #2 Senior Member   Gavin Tabor Join Date: Mar 2009 Posts: 181 Rep Power: 10 Actually what you have done here is to change the SIMPLE algorithm very fundamentally. SIMPLE (and PISO) split the discretisation of the momentum equation into pressure and everything else; what you have done is to lump them all in together. Gavin

 March 9, 2009, 06:26 Hi Gavin, that is it is a d #3 Member   Join Date: Mar 2009 Posts: 35 Rep Power: 10 Hi Gavin, that is it is a disadvantage with regards to the convergence? Regards, Khaled

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