Function tr

src/OpenFOAM/primitives/SymmTensor2D/SymmTensor2DI.H:229–232

//- Return the trace of a symmetric tensor
template<class Cmpt>
inline Cmpt tr(const SymmTensor2D<Cmpt>& st)
{
    return st.xx() + st.yy();
}


//- Return the spherical part of a symmetric tensor