ERF_GetRhoAlphaForFaces.H

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/**
 * Average rhoAlpha from cell centers to lower and upper z-edges of staggered faces.
 *
 * @param[in] i face i-index
 * @param[in] j face j-index
 * @param[in] k face k-index
 * @param[in] ioff x-direction staggering offset
 * @param[in] joff y-direction staggering offset
 * @param[out] rhoAlpha_lo rhoAlpha averaged to the lower z-edge
 * @param[out] rhoAlpha_hi rhoAlpha averaged to the upper z-edge
 * @param[in] cell_data conserved cell-centered state
 * @param[in] mu_turb turbulent viscosity
 * @param[in] mu_eff effective molecular viscosity. NOTE: unlike the mu_eff in
 *            ERF_MakeTauTerms.cpp and ComputeStress*, this does not include the
 *            factor of 2, because the u/v correction strains carry a factor of 1/2.
 * @param[in] l_consA flag for conservative constant-alpha diffusion
 * @param[in] l_turb flag for turbulent diffusion
 * @param[in] eddy_comp eddy-viscosity component to average (EddyDiff::Mom_v, or
 *            EddyDiff::Mom_h for the terrain-metric coefficient)
 */
AMREX_GPU_HOST_DEVICE
AMREX_FORCE_INLINE
void getRhoAlphaForFaces (int i, int j, int k, int ioff, int joff,
                  amrex::Real& rhoAlpha_lo, amrex::Real& rhoAlpha_hi,
                  const amrex::Array4<const amrex::Real>& cell_data,
                  const amrex::Array4<const amrex::Real>& mu_turb,
                  const amrex::Real mu_eff,
                  bool l_consA, bool l_turb,
                  const int eddy_comp = EddyDiff::Mom_v)
{
    if (l_consA && l_turb) {
        rhoAlpha_lo = fourth * ( cell_data(i,j,k  ,Rho_comp       ) + cell_data(i-ioff,j-joff,k  ,Rho_comp       )
                               + cell_data(i,j,k-1,Rho_comp       ) + cell_data(i-ioff,j-joff,k-1,Rho_comp       ) ) * mu_eff
                    + fourth * (   mu_turb(i,j,k  ,eddy_comp) +   mu_turb(i-ioff,j-joff,k  ,eddy_comp)
                               +   mu_turb(i,j,k-1,eddy_comp) +   mu_turb(i-ioff,j-joff,k-1,eddy_comp) );
        rhoAlpha_hi = fourth * ( cell_data(i,j,k  ,Rho_comp       ) + cell_data(i-ioff,j-joff,k  ,Rho_comp       )
                               + cell_data(i,j,k+1,Rho_comp       ) + cell_data(i-ioff,j-joff,k+1,Rho_comp       ) ) * mu_eff
                    + fourth * (   mu_turb(i,j,k  ,eddy_comp) +   mu_turb(i-ioff,j-joff,k  ,eddy_comp)
                               +   mu_turb(i,j,k+1,eddy_comp) +   mu_turb(i-ioff,j-joff,k+1,eddy_comp) );
    }
    else if (l_turb) // with MolecDiffType::Constant or None
    {
        rhoAlpha_lo = mu_eff
                    + fourth * (   mu_turb(i,j,k  ,eddy_comp) +   mu_turb(i-ioff,j-joff,k  ,eddy_comp)
                               +   mu_turb(i,j,k-1,eddy_comp) +   mu_turb(i-ioff,j-joff,k-1,eddy_comp) );
        rhoAlpha_hi = mu_eff
                    + fourth * (   mu_turb(i,j,k  ,eddy_comp) +   mu_turb(i-ioff,j-joff,k  ,eddy_comp)
                               +   mu_turb(i,j,k+1,eddy_comp) +   mu_turb(i-ioff,j-joff,k+1,eddy_comp) );
    }
    else if (l_consA) // without an LES/PBL model
    {
        rhoAlpha_lo = fourth * ( cell_data(i,j,k  ,Rho_comp       ) + cell_data(i-ioff,j-joff,k  ,Rho_comp       )
                               + cell_data(i,j,k-1,Rho_comp       ) + cell_data(i-ioff,j-joff,k-1,Rho_comp       ) ) * mu_eff;
        rhoAlpha_hi = fourth * ( cell_data(i,j,k  ,Rho_comp       ) + cell_data(i-ioff,j-joff,k  ,Rho_comp       )
                               + cell_data(i,j,k+1,Rho_comp       ) + cell_data(i-ioff,j-joff,k+1,Rho_comp       ) ) * mu_eff;
    }
    else // with MolecDiffType::Constant or None - without an LES/PBL model
    {
        rhoAlpha_lo = mu_eff;
        rhoAlpha_hi = mu_eff;
    }
}