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foam-extend4.1-coherent-io/applications/solvers/multiphase/twoLiquidMixingFoam/gammaEqn.H

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{
fvScalarMatrix gammaEqn
(
fvm::ddt(gamma)
+ fvm::div(phi, gamma)
- fvm::laplacian(Dab, gamma)
);
gammaEqn.solve();
rhoPhi = gammaEqn.flux()*(rho1 - rho2) + phi*rho2;
rho = gamma*rho1 + (scalar(1) - gamma)*rho2;
Info<< "Phase 1 volume fraction = "
<< gamma.weightedAverage(mesh.V()).value()
<< " Min(gamma) = " << min(gamma).value()
<< " Max(gamma) = " << max(gamma).value()
<< endl;
}