CFD Online Discussion Forums - Deprecation of argument input in OF 5+ onwards for MULES::explicitSolve

Hi, for OF 4++ and below, the MULES::explicitSolve could be written as such:

Code:

MULES::explicitSolve(alpha1, phi, phiAlpha, 1, 0);

But in OF 5++, it seems that such a method of declaring it is deprecated and the current approach of doing so as shown in VoF/alphaEqn.H is as follows:

Code:

MULES::explicitSolve

            (

                geometricOneField(),

                alpha1,

                phiCN,

                alphaPhi10,

                Sp,

                (Su + divU*min(alpha1(), scalar(1)))(),

                oneField(),

                zeroField()

            );

        }

It seems that all the additional arguments are either zeros or ones declared in a new way, I would appreciate any insight on this difference and what do the new arguments specifically mean.