fluidSolidInteraction updateresidual() 是什么

OpenFOAM
11 
vectorField solidZone2PointsDisplAtSolid =
        stress().faceZone2PointDisplacementIncrement(solidZoneIndex());

    solidZone2PointsDispl() =
//         solidToFluid().pointInterpolate
        ggiInterpolator2().slaveToMasterPointInterpolate
        (
            solidZone2PointsDisplAtSolid
        );

    residual2Prev() = residual2();

    residual2() = solidZone2PointsDispl() - fluid2ZonePointsDispl();

//     const scalarField& minLe = minEdgeLength();

//     scalar residualNorm = gMax(mag(residual())/(minLe + SMALL));

    scalar residual2Norm = ::sqrt(sum(magSqr(residual2())));

这些solidzone2我是想让它代表固体耦合边界二，但是这里一改，上面的成员函数、私有成员函数的相应的地方也要该，我怕一不小心改错了则麼办