3 (
phi1 -
phi1.oldTime())/runTime.deltaT()
8 (
phi2 -
phi2.oldTime())/runTime.deltaT()
surfaceScalarField ddtPhi2((phi2-phi2.oldTime())/runTime.deltaT())
surfaceScalarField & phi2
surfaceScalarField & phi1
surfaceScalarField ddtPhi1((phi1-phi1.oldTime())/runTime.deltaT())
GeometricField< scalar, fvsPatchField, surfaceMesh > surfaceScalarField