Function invariantI

src/OpenFOAM/primitives/Tensor2D/Tensor2DI.H:354–357

//- Return the 1st invariant of a tensor
template<class Cmpt>
inline Cmpt invariantI(const Tensor2D<Cmpt>& t)
{
    return tr(t);
}


//- Return the 2nd invariant of a tensor