vorticity.H

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#ifndef VORTICITY_H
#define VORTICITY_H
 
#include "src/fvm/fvm_utils.H"
 
namespace kynema_sgf::fvm {

template <typename FTypeIn, typename FTypeOut>
struct Vorticity
{
    Vorticity(FTypeOut& vortphi, const FTypeIn& phi)
        : m_vort(vortphi), m_phi(phi)
    {
        AMREX_ALWAYS_ASSERT_WITH_MESSAGE(
            AMREX_SPACEDIM == m_phi.num_comp(),
            "AMREX_SPACEDIM = " + std::to_string(AMREX_SPACEDIM) +
                ", m_phi.num_comp() = " + std::to_string(m_phi.num_comp()));
        AMREX_ALWAYS_ASSERT_WITH_MESSAGE(
            m_phi.num_grow() > amrex::IntVect(0),
            "m_phi.num_grow() = (" + std::to_string(m_phi.num_grow()[0]) +
                ", " + std::to_string(m_phi.num_grow()[1]) + ", " +
                std::to_string(m_phi.num_grow()[2]) + ")");
    }
 
    template <typename Stencil>
    void apply(const int lev) const
    {
        const auto& geom = m_phi.repo().mesh().Geom(lev);
        const auto& idx = geom.InvCellSizeArray();
        const auto dlo = geom.Domain().smallEnd();
        const auto dhi = geom.Domain().bigEnd();
 
        auto& out_mf = m_vort(lev);
        auto const& in_arrs = m_phi(lev).const_arrays();
        auto const& out_arrs = out_mf.arrays();
 
        amrex::ParallelFor(
            out_mf, amrex::IntVect(0),
            [=] AMREX_GPU_DEVICE(int nbx, int i, int j, int k) {
                if (!Stencil::applies_to(i, j, k, dlo, dhi)) {
                    return;
                }
                auto const& phi = in_arrs[nbx];
                auto const& vort = out_arrs[nbx];
                const amrex::Real vx = ((Stencil::c00 * phi(i + 1, j, k, 1)) +
                                        (Stencil::c01 * phi(i, j, k, 1)) +
                                        (Stencil::c02 * phi(i - 1, j, k, 1))) *
                                       idx[0];
                const amrex::Real wx = ((Stencil::c00 * phi(i + 1, j, k, 2)) +
                                        (Stencil::c01 * phi(i, j, k, 2)) +
                                        (Stencil::c02 * phi(i - 1, j, k, 2))) *
                                       idx[0];
                const amrex::Real uy = ((Stencil::c10 * phi(i, j + 1, k, 0)) +
                                        (Stencil::c11 * phi(i, j, k, 0)) +
                                        (Stencil::c12 * phi(i, j - 1, k, 0))) *
                                       idx[1];
                const amrex::Real wy = ((Stencil::c10 * phi(i, j + 1, k, 2)) +
                                        (Stencil::c11 * phi(i, j, k, 2)) +
                                        (Stencil::c12 * phi(i, j - 1, k, 2))) *
                                       idx[1];
                const amrex::Real uz = ((Stencil::c20 * phi(i, j, k + 1, 0)) +
                                        (Stencil::c21 * phi(i, j, k, 0)) +
                                        (Stencil::c22 * phi(i, j, k - 1, 0))) *
                                       idx[2];
                const amrex::Real vz = ((Stencil::c20 * phi(i, j, k + 1, 1)) +
                                        (Stencil::c21 * phi(i, j, k, 1)) +
                                        (Stencil::c22 * phi(i, j, k - 1, 1))) *
                                       idx[2];
                vort(i, j, k, 0) = wy - vz;
                vort(i, j, k, 1) = uz - wx;
                vort(i, j, k, 2) = vx - uy;
            });
    }
 
    FTypeOut& m_vort;
    const FTypeIn& m_phi;
};

template <typename FTypeIn, typename FTypeOut>
void vorticity(FTypeOut& vortphi, const FTypeIn& phi)
{
    BL_PROFILE("kynema-sgf::fvm::vorticity");
    Vorticity<FTypeIn, FTypeOut> vort(vortphi, phi);
    impl::apply(vort, phi);
}

template <typename FType>
std::unique_ptr<ScratchField> vorticity(const FType& phi)
{
    const std::string gname = phi.name() + "_vorticity";
    auto vortphi = phi.repo().create_scratch_field(gname, AMREX_SPACEDIM);
    vorticity(*vortphi, phi);
    return vortphi;
}
 
} // namespace kynema_sgf::fvm
 
#endif /* VORTICITY_H */