ERF
Energy Research and Forecasting: An Atmospheric Modeling Code
surface_temp Struct Reference

#include <ERF_MOSTStress.H>

Collaboration diagram for surface_temp:

Public Member Functions

 surface_temp (amrex::Real zref, amrex::Real Tflux, amrex::Real Qvflux, bool cons_qflux)
 
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 > &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
 

Private Attributes

most_data mdata
 
bool spec_qflux
 
similarity_funs sfuns
 
const amrex::Real tol = 1.0e-3
 
const amrex::Real alpha = 0.5
 
const amrex::Real WSMIN = 0.1
 

Detailed Description

Surface temperature with constant roughness

Constructor & Destructor Documentation

◆ surface_temp()

surface_temp::surface_temp ( amrex::Real  zref,
amrex::Real  Tflux,
amrex::Real  Qvflux,
bool  cons_qflux 
)
inline
1068  {
1069  mdata.zref = zref;
1070  mdata.surf_temp_flux = Tflux;
1071  mdata.surf_moist_flux = Qvflux;
1072  spec_qflux = cons_qflux;
1073  }
amrex::Real surf_moist_flux
Moisture flux.
Definition: ERF_MOSTStress.H:20
amrex::Real zref
Reference height (m)
Definition: ERF_MOSTStress.H:15
amrex::Real surf_temp_flux
Heat flux.
Definition: ERF_MOSTStress.H:19
bool spec_qflux
Definition: ERF_MOSTStress.H:1185
most_data mdata
Definition: ERF_MOSTStress.H:1184

Member Function Documentation

◆ iterate_flux()

AMREX_GPU_DEVICE AMREX_FORCE_INLINE void surface_temp::iterate_flux ( const int &  i,
const int &  j,
const int &  k,
const int &  max_iters,
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
1098  {
1099  amrex::Real Rib = 0.0;
1100  amrex::Real zeta = 0.0;
1101  amrex::Real zeta_old = 0.0;
1102  amrex::Real psi_m = 0.0;
1103  amrex::Real psi_h = 0.0;
1104  amrex::Real num = 0.0;
1105  amrex::Real den = 0.0;
1106  amrex::Real z0 = z0_arr(i,j,k);
1107  amrex::Real umm = std::max(umm_arr(i,j,k), WSMIN);
1108  amrex::Real C = std::log(mdata.zref / z0);
1109 
1110  // First iteration we assume neutral (L -> inf)
1111  if (u_star_arr(i,j,k) == 1.E34) { olen_arr(i,j,k) = 1.0e3; }
1112  zeta = mdata.zref / olen_arr(i,j,k);
1113 
1114  // Water vapor in atmos and surface
1115  amrex::Real qv_s, qv_a;
1116  if (q_surf_arr(i,j,k) > 0.) {
1117  qv_s = q_surf_arr(i,j,k);
1118  } else {
1119  // First iteration and no qv_surf was specified
1120  // Use mean since there will be no flux
1121  qv_s = qvm_arr(i,j,k);
1122  }
1123  qv_a = qvm_arr(i,j,k);
1124 
1125  // update w* and Umagmean from Beljaars (1995)
1126  if (w_star_arr) {
1127  // NOTE: Thv flux is lagged, similar to WRF
1128  psi_m = sfuns.calc_psi_m2(zeta);
1129  psi_h = sfuns.calc_psi_h2(zeta);
1130  amrex::Real ustar = mdata.kappa * umm / (C - psi_m);
1131  amrex::Real tstar = mdata.kappa * (tm_arr(i,j,k) - t_surf_arr(i,j,k)) / (C - psi_h);
1133  -ustar * mdata.kappa * (qv_a - qv_s) / (C - psi_h);
1134  amrex::Real tflux = -ustar*tstar*(1 + 0.61*qvm_arr(i,j,k)) + 0.61*tm_arr(i,j,k)*qflux;
1135  w_star_arr(i,j,k) = calc_wstar(tflux, pblh_arr(i,j,k), tvm_arr(i,j,k));
1136  amrex::Real wstar = mdata.Bjr_beta * w_star_arr(i,j,k);
1137  umm = std::sqrt(umm_arr(i,j,k)*umm_arr(i,j,k) + wstar*wstar);
1138  umm = std::max(umm, WSMIN);
1139  }
1140 
1141  // Bulk Richardson number w/ moisture
1142  amrex::Real thv_s = t_surf_arr(i,j,k) * (1.0 + 0.61*qv_s);
1143  amrex::Real thv_a = tm_arr(i,j,k) * (1.0 + 0.61*qv_a);
1144  Rib = ( (mdata.gravity * mdata.zref) / tm_arr(i,j,k) ) *
1145  ( (thv_a - thv_s) / (umm * umm) );
1146  Rib = std::min(std::max(Rib,-4.0),4.0);
1147 
1148  // Fixed point iteration on zeta
1149  int iter = 0;
1150  do {
1151  // Transfer curr to old
1152  zeta_old = zeta;
1153 
1154  // Stability functions
1155  psi_m = sfuns.calc_psi_m2(zeta_old);
1156  psi_h = sfuns.calc_psi_h2(zeta_old);
1157 
1158  // Limiting
1159  num = std::max(C - psi_m, 1.0);
1160  den = std::max(C - psi_h, 1.0);
1161 
1162  // Update with under relaxation
1163  zeta = (1.0 - alpha) * zeta_old + alpha * Rib * num * num / den;
1164 
1165  ++iter;
1166  } while ( (std::abs(zeta - zeta_old) > tol) && (iter <= max_iters) );
1167  AMREX_ALWAYS_ASSERT_WITH_MESSAGE(iter < max_iters,
1168  "Maximum number of MOST iterations reached.");
1169 
1170  // Populate the stored MOST arrays
1171  olen_arr(i,j,k) = mdata.zref / zeta;
1172  u_star_arr(i,j,k) = mdata.kappa * umm / (C - psi_m);
1173  t_star_arr(i,j,k) = mdata.kappa * (tm_arr(i,j,k) - t_surf_arr(i,j,k)) / (C - psi_h);
1174  if (spec_qflux) {
1175  q_surf_arr(i,j,k) = mdata.surf_moist_flux * (C - psi_h) /
1176  (u_star_arr(i,j,k) * mdata.kappa) + qvm_arr(i,j,k);
1177  q_star_arr(i,j,k) = -mdata.surf_moist_flux / u_star_arr(i,j,k);
1178  } else {
1179  q_star_arr(i,j,k) = mdata.kappa * (qvm_arr(i,j,k) - q_surf_arr(i,j,k)) / (C - psi_h);
1180  }
1181  }
@ num
Definition: ERF_DataStruct.H:22
amrex::Real Real
Definition: ERF_ShocInterface.H:16
AMREX_GPU_DEVICE AMREX_FORCE_INLINE amrex::Real calc_wstar(const amrex::Real &ust, const amrex::Real &tst, const amrex::Real &qst, const amrex::Real &pblh, const amrex::Real &th, const amrex::Real &thv, const amrex::Real &qv=0.0)
Definition: ERF_Wstar.H:13
amrex::Real kappa
von Karman constant
Definition: ERF_MOSTStress.H:17
amrex::Real gravity
Acceleration due to gravity (m/s^2)
Definition: ERF_MOSTStress.H:18
const amrex::Real Bjr_beta
Definition: ERF_MOSTStress.H:29
AMREX_GPU_HOST_DEVICE AMREX_FORCE_INLINE amrex::Real calc_psi_h2(amrex::Real zeta) const
Definition: ERF_MOSTStress.H:64
AMREX_GPU_HOST_DEVICE AMREX_FORCE_INLINE amrex::Real calc_psi_m2(amrex::Real zeta) const
Definition: ERF_MOSTStress.H:44
similarity_funs sfuns
Definition: ERF_MOSTStress.H:1186
const amrex::Real tol
Definition: ERF_MOSTStress.H:1187
const amrex::Real alpha
Definition: ERF_MOSTStress.H:1188
const amrex::Real WSMIN
Definition: ERF_MOSTStress.H:1189
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Member Data Documentation

◆ alpha

const amrex::Real surface_temp::alpha = 0.5
private

Referenced by iterate_flux().

◆ mdata

most_data surface_temp::mdata
private

Referenced by iterate_flux(), and surface_temp().

◆ sfuns

similarity_funs surface_temp::sfuns
private

Referenced by iterate_flux().

◆ spec_qflux

bool surface_temp::spec_qflux
private

Referenced by iterate_flux(), and surface_temp().

◆ tol

const amrex::Real surface_temp::tol = 1.0e-3
private

Referenced by iterate_flux().

◆ WSMIN

const amrex::Real surface_temp::WSMIN = 0.1
private

Referenced by iterate_flux().


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