# whats the mathematical equivalence of this formula?

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 June 26, 2013, 12:04 whats the mathematical equivalence of this formula? #1 Senior Member     Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,209 Rep Power: 19 whats the mathematical equivalence of this formula? which equation is used in rhoCentralFoam? Code: ```// --- Solve momentum solve(fvm::ddt(rhoU) + fvc::div(phiUp)); U.dimensionedInternalField() = rhoU.dimensionedInternalField() /rho.dimensionedInternalField(); U.correctBoundaryConditions(); rhoU.boundaryField() = rho.boundaryField()*U.boundaryField(); volScalarField rhoBydt(rho/runTime.deltaT()); if (!inviscid) { solve ( fvm::ddt(rho, U) - fvc::ddt(rho, U) - fvm::laplacian(muEff, U) - fvc::div(tauMC) ); rhoU = rho*U; }``` __________________ Injustice Anywhere is a Threat for Justice Everywhere.Martin Luther King. To Be or Not To Be,Thats the Question! The Only Stupid Question Is the One that Goes Unasked.

 June 30, 2013, 07:50 #2 Super Moderator   Bruno Santos Join Date: Mar 2009 Location: Lisbon, Portugal Posts: 9,892 Blog Entries: 39 Rep Power: 108 Hi Ehsan, I don't know the answer, but I've picked on the following breadcrumbs on this topic: Check the PDF files on the last link. Best regards, Bruno immortality likes this. __________________ OpenFOAM: FAQ | Getting started Forum: How to get help, to post code/output and forum guide What am I doing/planning: blog/wiki Read this before sending me PM

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