REMORA_coriolis.cpp

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#include <REMORA.H>
 
using namespace amrex;
 
/**
 * @param[in   ] xbx      nodal box in x-direction
 * @param[in   ] ybx      nodal box in y-direction
 * @param[in   ] uold     u-direction velocity
 * @param[in   ] vold     v-direction velocity
 * @param[inout] ru       u-direction velocity RHS
 * @param[inout] rv       v-direction velocity RHS
 * @param[in   ] Hz       vertical cell height
 * @param[in   ] fomn     scaled coriolis factor
 * @param[in   ] nrhs     which velocity component to use
 * @param[in   ] nr       which RHS component to update
 */
 
void
REMORA::coriolis (const Box& xbx, const Box& ybx,
                 const Array4<Real const>& uold,
                 const Array4<Real const>& vold,
                 const Array4<Real      >& ru,
                 const Array4<Real      >& rv,
                 const Array4<Real const>& Hz,
                 const Array4<Real const>& fomn,
                 int nrhs, int nr)
{
    //
    //-----------------------------------------------------------------------
    //  Add in Coriolis terms.
    //-----------------------------------------------------------------------
    //
 
    ParallelFor(xbx,
    [=] AMREX_GPU_DEVICE (int i, int j, int k)
    {
        Real UFx_i   = 0.5_rt * Hz(i  ,j,k) * fomn(i  ,j,0) * (vold(i  ,j,k,nrhs)+vold(i  ,j+1,k,nrhs));
        Real UFx_im1 = 0.5_rt * Hz(i-1,j,k) * fomn(i-1,j,0) * (vold(i-1,j,k,nrhs)+vold(i-1,j+1,k,nrhs));
        ru(i,j,k,nr) += 0.5_rt*(UFx_i + UFx_im1);
    });
 
    ParallelFor(ybx,
    [=] AMREX_GPU_DEVICE (int i, int j, int k)
    {
        Real VFe_j   = 0.5_rt * Hz(i,j  ,k) * fomn(i,j  ,0) * (uold(i,j  ,k,nrhs)+uold(i+1,j  ,k,nrhs));
        Real VFe_jm1 = 0.5_rt * Hz(i,j-1,k) * fomn(i,j-1,0) * (uold(i,j-1,k,nrhs)+uold(i+1,j-1,k,nrhs));
        rv(i,j,k,nr) -= 0.5_rt*(VFe_j + VFe_jm1);
    });
}