gammaEqn.H in the interPhaseChangeFoam solver
In gammaEqn.H in the interPhaseChangeFoam we can see this line:
MULES::implicitSolve(oneField(), gamma, phi, phiGamma, Sp, Su, 1, 0); I know that: gamma: is the actual value of gamma to be solved phi: is the normal convective flux phiGamma: U*gamma + gamma*(1gamma)*U 1, 0 : max and min gamma values But I don't unserstand what Sp and Su are. I think that Sp is a source term to solve the equation: d(gamma)/dt + div(phigamma) = Sp Am I all right? What is Su term? 
Quote:
Hi, I think, your expression about the gamma equation is right. In fact, to this equation, Source term = vDotvAlphal * gamma + (1  gamma) * vDotcAlphal = (vDotvAlphal  vDotcAlphal) * gamma + vDotcAlphal. So, Sp = (vDotvAlphal  vDotcAlphal) * gamma , and it will be solved implicitly. Su = vDotcAlphal, and it is an explicit term in this equation. But, why Su also includes the term divU*gamma in gammaEqu.H ? If the MULES::implicitSolver was chose, this term should be deleted, right? Because in MULESTemplates.C, phiPsi = phiGamma = phi*gamma + gamma*(1gamma)*phi, the term div(phi*gamma) [=divU*gamma ??] has been actually included as follows:  fvScalarMatrix psiConvectionDiffusion ( fvm::ddt(rho, psi) + fv::gaussConvectionScheme<scalar>(mesh, phi, UDs).fvmDiv(phi, psi)  fvm::Sp(Sp, psi)  Su ); surfaceScalarField phiBD = psiConvectionDiffusion.flux(); surfaceScalarField& phiCorr = phiPsi; phiCorr = phiBD; ....... ....... solve ( psiConvectionDiffusion + fvc::div(lambda*phiCorr), MULEScontrols.lookup("solver") );  Am I right? Thanks. 

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