vorticity.H

Go to the documentation of this file.

#ifndef VORTICITY_H
#define VORTICITY_H
 
#include "amr-wind/fvm/fvm_utils.H"
 
namespace amr_wind::fvm {

template <typename FTypeIn, typename FTypeOut>
struct Vorticity
{
    Vorticity(FTypeOut& vortphi, const FTypeIn& phi)
        : m_vort(vortphi), m_phi(phi)
    {
        AMREX_ALWAYS_ASSERT(AMREX_SPACEDIM == m_phi.num_comp());
        AMREX_ALWAYS_ASSERT(m_phi.num_grow() > amrex::IntVect(0));
    }
 
    template <typename Stencil>
    void apply(const int lev, const amrex::MFIter& mfi) const
    {
        const auto& geom = m_phi.repo().mesh().Geom(lev);
        const auto& idx = geom.InvCellSizeArray();
        const auto& vort = m_vort(lev).array(mfi);
        const auto& phi = m_phi(lev).const_array(mfi);
 
        const auto& bx_in = mfi.tilebox();
        const auto& bx = Stencil::box(bx_in, geom);
        if (bx.isEmpty()) {
            return;
        }
 
        amrex::ParallelFor(bx, [=] AMREX_GPU_DEVICE(int i, int j, int k) {
            amrex::Real cp1, c, cm1, uy, uz, vx, vz, wx, wy;
            cp1 = Stencil::c00;
            c = Stencil::c01;
            cm1 = Stencil::c02;
 
            vx = (cp1 * phi(i + 1, j, k, 1) + c * phi(i, j, k, 1) +
                  cm1 * phi(i - 1, j, k, 1)) *
                 idx[0];
            wx = (cp1 * phi(i + 1, j, k, 2) + c * phi(i, j, k, 2) +
                  cm1 * phi(i - 1, j, k, 2)) *
                 idx[0];
 
            cp1 = Stencil::c10;
            c = Stencil::c11;
            cm1 = Stencil::c12;
 
            uy = (cp1 * phi(i, j + 1, k, 0) + c * phi(i, j, k, 0) +
                  cm1 * phi(i, j - 1, k, 0)) *
                 idx[1];
            wy = (cp1 * phi(i, j + 1, k, 2) + c * phi(i, j, k, 2) +
                  cm1 * phi(i, j - 1, k, 2)) *
                 idx[1];
 
            cp1 = Stencil::c20;
            c = Stencil::c21;
            cm1 = Stencil::c22;
 
            uz = (cp1 * phi(i, j, k + 1, 0) + c * phi(i, j, k, 0) +
                  cm1 * phi(i, j, k - 1, 0)) *
                 idx[2];
            vz = (cp1 * phi(i, j, k + 1, 1) + c * phi(i, j, k, 1) +
                  cm1 * 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("amr-wind::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 amr_wind::fvm
 
#endif /* VORTICITY_H */