[farzadmech]

Hello all
I am working on interFoam and I have forcing to momentum equation and this force must be proportional to the pahse1 and phase2 where phase1 must be forced(1*force) and phase2 must not be forced(0*force). Now, should I easily multiply alpha1 to my force? or what should I do?

alpha1*force

Basically, what is the results of volScalarField*volVectorField?

MRF.correctBoundaryVelocity(U);

    fvVectorMatrix UEqn
    (
        fvm::ddt(rho, U) + fvm::div(rhoPhi, U)
      + MRF.DDt(rho, U)
      + turbulence->divDevRhoReff(rho, U)
     ==
        fvOptions(rho, U) + alpha1*force
    );

    UEqn.relax();

    fvOptions.constrain(UEqn);

Thanks,
Farzad