surface_temp_eb Struct Reference

EB surface-layer model with prescribed surface temperature and constant roughness. More...

#include <ERF_EBMOSTStress.H>

Collaboration diagram for surface_temp_eb:

Public Member Functions
	surface_temp_eb (amrex::Real Tflux, amrex::Real Qvflux, bool cons_qflux)
	Construct a prescribed-temperature EB flux functor. More...
AMREX_GPU_DEVICE AMREX_FORCE_INLINE void	iterate_flux (const int &i, const int &j, const int &k, const int &max_iters, const amrex::Array4< const amrex::Real > &zref_arr, const amrex::Array4< const amrex::Real > &z0_arr, const amrex::Array4< const amrex::Real > &umm_arr, const amrex::Array4< const amrex::Real > &tm_arr, const amrex::Array4< const amrex::Real > &tvm_arr, const amrex::Array4< const amrex::Real > &qvm_arr, const amrex::Array4< amrex::Real > &u_star_arr, const amrex::Array4< amrex::Real > &w_star_arr, const amrex::Array4< amrex::Real > &t_star_arr, const amrex::Array4< amrex::Real > &q_star_arr, const amrex::Array4< amrex::Real > &t_surf_arr, const amrex::Array4< amrex::Real > &q_surf_arr, const amrex::Array4< amrex::Real > &olen_arr, const amrex::Array4< amrex::Real > &pblh_arr, const amrex::Array4< amrex::Real > &, const amrex::Array4< amrex::Real > &, const amrex::Array4< amrex::Real > &) const
	Iterate MOST stability functions and update surface flux scales. More...

Private Attributes
most_data	mdata
bool	spec_qflux
similarity_funs	sfuns
const amrex::Real	tol = amrex::Real(1.0e-3)
const amrex::Real	alpha = myhalf
const amrex::Real	WSMIN = amrex::Real(0.1)

Detailed Description

EB surface-layer model with prescribed surface temperature and constant roughness.

Constructor & Destructor Documentation

surface_temp_eb()

surface_temp_eb::surface_temp_eb ( amrex::Real  Tflux, amrex::Real  Qvflux, bool  cons_qflux  )

inline

Construct a prescribed-temperature EB flux functor.

Parameters

Tflux	Prescribed surface temperature flux.
Qvflux	Prescribed surface moisture flux.
cons_qflux	Whether the moisture flux is prescribed directly.

    {
        mdata.surf_temp_flux  = Tflux;
        mdata.surf_moist_flux = Qvflux;
        spec_qflux = cons_qflux;
    }

Member Function Documentation

iterate_flux()

AMREX_GPU_DEVICE AMREX_FORCE_INLINE void surface_temp_eb::iterate_flux ( const int &  i, const int &  j, const int &  k, const int &  max_iters, const amrex::Array4< const amrex::Real > &  zref_arr, const amrex::Array4< const amrex::Real > &  z0_arr, const amrex::Array4< const amrex::Real > &  umm_arr, const amrex::Array4< const amrex::Real > &  tm_arr, const amrex::Array4< const amrex::Real > &  tvm_arr, const amrex::Array4< const amrex::Real > &  qvm_arr, const amrex::Array4< amrex::Real > &  u_star_arr, const amrex::Array4< amrex::Real > &  w_star_arr, const amrex::Array4< amrex::Real > &  t_star_arr, const amrex::Array4< amrex::Real > &  q_star_arr, const amrex::Array4< amrex::Real > &  t_surf_arr, const amrex::Array4< amrex::Real > &  q_surf_arr, const amrex::Array4< amrex::Real > &  olen_arr, const amrex::Array4< amrex::Real > &  pblh_arr, const amrex::Array4< amrex::Real > &  , const amrex::Array4< amrex::Real > &  , const amrex::Array4< amrex::Real > &    ) const

inline

Iterate MOST stability functions and update surface flux scales.

    {
        amrex::Real Rib      = zero;
        amrex::Real zeta     = zero;
        amrex::Real zeta_old = zero;
        amrex::Real psi_m    = zero;
        amrex::Real psi_h    = zero;
        amrex::Real CmPsim   = zero;
        amrex::Real CmPsih   = zero;
        amrex::Real zref     = zref_arr(i,j,0);
        amrex::Real z0       = z0_arr(i,j,k);
        amrex::Real umm      = std::max(umm_arr(i,j,0), WSMIN);
        amrex::Real C        = std::log(zref / z0);
 
        // First iteration we assume neutral (L -> inf)
        if (u_star_arr(i,j,k) == bogus_large_value) {
            olen_arr(i,j,k) = amrex::Real(1000);
        }
        zeta  = zref / olen_arr(i,j,k);
 
        // Water vapor in atmos and surface
        amrex::Real qv_s, qv_a;
        if (q_surf_arr(i,j,k) > zero) {
            qv_s = q_surf_arr(i,j,k);
        } else {
            // First iteration and no qv_surf was specified
            // Use mean since there will be no flux
            qv_s = qvm_arr(i,j,0);
        }
        qv_a = qvm_arr(i,j,0);
 
        // update w* and Umagmean from Beljaars (1995)
        if (w_star_arr) {
            // NOTE: Thv flux is lagged, similar to WRF
            psi_m = sfuns.calc_psi_m2(zeta);
            psi_h = sfuns.calc_psi_h2(zeta);
            amrex::Real ustar = mdata.kappa * umm / most_bracket(C, psi_m);
            amrex::Real tstar = mdata.kappa * (tm_arr(i,j,0) - t_surf_arr(i,j,k)) / most_bracket(C, psi_h);
            amrex::Real qflux = (spec_qflux) ? mdata.surf_moist_flux :
                                 -ustar * mdata.kappa * (qv_a - qv_s) / most_bracket(C, psi_h);
            amrex::Real tflux = -ustar*tstar*(one + epsv*qvm_arr(i,j,0)) + epsv*tm_arr(i,j,0)*qflux;
            w_star_arr(i,j,k) = calc_wstar(tflux, pblh_arr(i,j,k), tvm_arr(i,j,0));
            amrex::Real wstar = mdata.Bjr_beta * w_star_arr(i,j,k);
            umm = std::sqrt(umm_arr(i,j,0)*umm_arr(i,j,0) + wstar*wstar);
            umm = std::max(umm, WSMIN);
        }
 
        // Bulk Richardson number w/ moisture
        amrex::Real thv_s = t_surf_arr(i,j,k) * (one + epsv*qv_s);
        amrex::Real thv_a =     tm_arr(i,j,0) * (one + epsv*qv_a);
        Rib = ( (mdata.gravity * zref) / tm_arr(i,j,0) ) *
              ( (thv_a - thv_s) / (umm * umm) );
        Rib = std::min(std::max(Rib,-amrex::Real(4.0)),amrex::Real(4.0));
 
        // Fixed point iteration on zeta
        const amrex::Real zeta_start = zeta;
        int iter = 0;
        do {
            // Transfer curr to old
            zeta_old = zeta;
 
            // Stability functions
            psi_m = sfuns.calc_psi_m2(zeta_old);
            psi_h = sfuns.calc_psi_h2(zeta_old);
 
            // Limiting
            CmPsim = most_bracket(C, psi_m);
            CmPsih = most_bracket(C, psi_h);
 
            // Update with under relaxation
            zeta = (one - alpha) * zeta_old + alpha * Rib * CmPsim * CmPsim / CmPsih;
 
            ++iter;
        } while ( (std::abs(zeta - zeta_old) > tol) && (iter <= max_iters) );
        if (iter > max_iters ||
            !most_rib_zeta_is_root(sfuns, C, Rib, zeta, amrex::Real(10.0) * tol)) {
            // The relaxed iteration stalls, or stops where no root is near, where its residual
            // nearly touches zero (z0 comparable to zref); solve the same equation by bracketing
            zeta   = most_rib_zeta_bracketed(sfuns, C, Rib, zeta_start, tol);
            CmPsim = most_bracket(C, sfuns.calc_psi_m2(zeta));
            CmPsih = most_bracket(C, sfuns.calc_psi_h2(zeta));
        }
 
        // Populate the stored MOST arrays
        olen_arr(i,j,k)   = zref / zeta;
        u_star_arr(i,j,k) = mdata.kappa * umm / CmPsim;
        t_star_arr(i,j,k) = mdata.kappa * (tm_arr(i,j,0) - t_surf_arr(i,j,k)) / CmPsih;
        if (spec_qflux) {
            q_surf_arr(i,j,k) = mdata.surf_moist_flux * CmPsih /
                                (u_star_arr(i,j,k) * mdata.kappa) + qvm_arr(i,j,0);
            q_star_arr(i,j,k) = -mdata.surf_moist_flux / u_star_arr(i,j,k);
        } else {
            q_star_arr(i,j,k) = mdata.kappa * (qvm_arr(i,j,0) - q_surf_arr(i,j,k)) / CmPsih;
        }
    }

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Member Data Documentation

alpha

const amrex::Real surface_temp_eb::alpha = myhalf

private

Referenced by iterate_flux().

mdata

most_data surface_temp_eb::mdata

private

Referenced by iterate_flux(), and surface_temp_eb().

sfuns

similarity_funs surface_temp_eb::sfuns

private

Referenced by iterate_flux().

spec_qflux

bool surface_temp_eb::spec_qflux

private

Referenced by iterate_flux(), and surface_temp_eb().

tol

const amrex::Real surface_temp_eb::tol = amrex::Real(1.0e-3)

private

Referenced by iterate_flux().

WSMIN

const amrex::Real surface_temp_eb::WSMIN = amrex::Real(0.1)

private

Referenced by iterate_flux().

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The documentation for this struct was generated from the following file:

• Source/EB/ERF_EBMOSTStress.H