# 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: 2,186 Rep Power: 16 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.