[wxxq]

n openfoam, the surface interpolation format is essentially a central difference method for determining face value，like this code
sfi[fi] = Sfi[fi] & (lambda[fi]*(vfi[P[fi]] - vfi[N[fi]]) + vfi[N[fi]] ；
Now I want to modify this formula like this ：
φ¯j = λjφP + (1 − λj)φP j + ∇φ · dj j， djj， how can i call gradscheme to caculate the φ in the code . Thanks.