function [D_scheme, penalties_scheme, D] = constructSchemeDiffOp(scheme, g, schemeOrder, schemeParams, opSet, BCs)
    %% DiffOps for solution vector
    [D, penalties_scheme] = rv.diffops.constructFluxDiffOpWithClosures(scheme, g, schemeOrder, schemeParams, opSet, BCs);
    D2 = rv.diffops.constructSymmetricD2(g, schemeOrder, opSet);
    D_scheme = @(v,Viscosity)(D(v) + D2(Viscosity)*v);
end