ERF
Energy Research and Forecasting: An Atmospheric Modeling Code
Public Member Functions | Private Attributes | List of all members
surface_temp_donelan Struct Reference

#include <ERF_MOSTStress.H>

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Public Member Functions

 surface_temp_donelan (amrex::Real Tflux, amrex::Real Qvflux, bool use_visc, 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 > &zref_arr, const amrex::Array4< 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 = amrex::Real(1.0e-3)
 
const amrex::Real tol_z = amrex::Real(1.0e-10)
 
const amrex::Real alpha = myhalf
 
const amrex::Real WSMIN = most_min_wind_speed
 

Detailed Description

Surface temperature with donelan roughness

Constructor & Destructor Documentation

◆ surface_temp_donelan()

surface_temp_donelan::surface_temp_donelan ( amrex::Real  Tflux,
amrex::Real  Qvflux,
bool  use_visc,
bool  cons_qflux 
)
inline

Construct specified-temperature, Donelan-roughness MOST data.

Parameters
[in]Tfluxprescribed heat flux
[in]Qvfluxprescribed moisture flux
[in]cons_qfluxwhether the moisture flux is specified
1746  {
1747  mdata.surf_temp_flux = Tflux;
1748  mdata.surf_moist_flux = Qvflux;
1749  mdata.visc = use_visc;
1750  spec_qflux = cons_qflux;
1751  }
most_data::surf_moist_flux
amrex::Real surf_moist_flux
Moisture flux.
Definition: ERF_MOSTUtils.H:16
most_data::visc
bool visc
Use viscous Charnock formulation.
Definition: ERF_MOSTUtils.H:23
most_data::surf_temp_flux
amrex::Real surf_temp_flux
Heat flux TODO: decide whether this is <θ'w'> or <θv'w'> under moist conditions.
Definition: ERF_MOSTUtils.H:15
surface_temp_donelan::mdata
most_data mdata
Definition: ERF_MOSTStress.H:1897
surface_temp_donelan::spec_qflux
bool spec_qflux
Definition: ERF_MOSTStress.H:1898

Member Function Documentation

◆ iterate_flux()

AMREX_GPU_DEVICE AMREX_FORCE_INLINE void surface_temp_donelan::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< 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 state for one surface point.

Calling sequence
i, j, k, max_iters, zref_arr, z0_arr, umm_arr, tm_arr, tvm_arr, qvm_arr, u_star_arr, w_star_arr, t_star_arr, q_star_arr, t_surf_arr, q_surf_arr, olen_arr, pblh_arr, Hwave_arr, Lwave_arr, eta_arr.
1786  {
1787  amrex::Real Rib = zero;
1788  amrex::Real zeta = zero;
1789  amrex::Real zeta_old = zero;
1790  amrex::Real psi_m = zero;
1791  amrex::Real psi_h = zero;
1792  amrex::Real CmPsim = zero;
1793  amrex::Real CmPsih = zero;
1794  amrex::Real z0 = z0_arr(i,j,k);
1795  amrex::Real z0_old = z0;
1796  amrex::Real ustar = zero;
1797  amrex::Real zref = zref_arr(i,j,k);
1798  amrex::Real umm = std::max(umm_arr(i,j,k), WSMIN);
1799  amrex::Real C = std::log(zref / z0);
1800 
1801  // First iteration we assume neutral (L -> inf)
1802  if (u_star_arr(i,j,k) == bogus_large_value) {
1803  olen_arr(i,j,k) = amrex::Real(1.0e3);
1804  }
1805  zeta = zref / olen_arr(i,j,k);
1806 
1807  // Water vapor in atmos and surface
1808  amrex::Real qv_s, qv_a;
1809  if (q_surf_arr(i,j,k) > zero) {
1810  qv_s = q_surf_arr(i,j,k);
1811  } else {
1812  // First iteration and no qv_surf was specified
1813  // Use mean since there will be no flux
1814  qv_s = qvm_arr(i,j,k);
1815  }
1816  qv_a = qvm_arr(i,j,k);
1817 
1818  // update w* and Umagmean from Beljaars (1995)
1819  if (w_star_arr) {
1820  // NOTE: Thv flux is lagged, similar to WRF
1821  psi_m = sfuns.calc_psi_m2(zeta);
1822  psi_h = sfuns.calc_psi_h2(zeta);
1823  ustar = mdata.kappa * umm / (C - psi_m);
1824  amrex::Real tstar = mdata.kappa * (tm_arr(i,j,k) - t_surf_arr(i,j,k)) / (C - psi_h);
1825  amrex::Real qflux = (spec_qflux) ? mdata.surf_moist_flux :
1826  -ustar * mdata.kappa * (qv_a - qv_s) / (C - psi_h);
1827  amrex::Real tflux = -ustar*tstar*(one + epsv*qvm_arr(i,j,k)) + epsv*tm_arr(i,j,k)*qflux;
1828  w_star_arr(i,j,k) = calc_wstar(tflux, pblh_arr(i,j,k), tvm_arr(i,j,k));
1829  amrex::Real wstar = mdata.Bjr_beta * w_star_arr(i,j,k);
1830  umm = std::sqrt(umm_arr(i,j,k)*umm_arr(i,j,k) + wstar*wstar);
1831  umm = std::max(umm, WSMIN);
1832  }
1833 
1834  // Bulk Richardson number w/ moisture
1835  amrex::Real thv_s = t_surf_arr(i,j,k) * (one + epsv*qv_s);
1836  amrex::Real thv_a = tm_arr(i,j,k) * (one + epsv*qv_a);
1837  Rib = ( (mdata.gravity * zref) / tm_arr(i,j,k) ) *
1838  ( (thv_a - thv_s) / (umm * umm) );
1839  Rib = std::min(std::max(Rib,-amrex::Real(4.0)),amrex::Real(4.0));
1840 
1841  // Fixed point iteration on zeta
1842  int iter = 0;
1843  do {
1844  // Transfer curr to old
1845  zeta_old = zeta;
1846 
1847  // Stability functions
1848  psi_m = sfuns.calc_psi_m2(zeta_old);
1849  psi_h = sfuns.calc_psi_h2(zeta_old);
1850 
1851  // Fixed point iteration on roughness
1852  int iter_z = 0;
1853  do {
1854  // Transfer curr to old
1855  z0_old = z0;
1856 
1857  // Update
1858  C = std::log(zref / z0_old);
1859  CmPsim = std::max(C - psi_m, amrex::Real(1.0));
1860  ustar = mdata.kappa * umm / CmPsim;
1861  // NOTE: air_viscosity should take T and not Th!
1862  z0 = Donelan_roughness(ustar, air_viscosity(tm_arr(i,j,k)), mdata.visc);
1863 
1864  ++iter_z;
1865  } while ( (std::abs(z0 - z0_old) > tol_z) && (iter_z <= max_iters) );
1866  AMREX_ALWAYS_ASSERT_WITH_MESSAGE(iter_z < max_iters,
1867  "Maximum number of MOST roughness iterations reached.");
1868  C = std::log(zref / z0);
1869 
1870  // Limiting
1871  CmPsim = std::max(C - psi_m, amrex::Real(1.0));
1872  CmPsih = std::max(C - psi_h, amrex::Real(1.0));
1873 
1874  // Update with under relaxation
1875  zeta = (amrex::Real(1.0) - alpha) * zeta_old + alpha * Rib * CmPsim * CmPsim / CmPsih;
1876 
1877  ++iter;
1878  } while ( (std::abs(zeta - zeta_old) > tol) && (iter <= max_iters) );
1879  AMREX_ALWAYS_ASSERT_WITH_MESSAGE(iter < max_iters,
1880  "Maximum number of MOST iterations reached.");
1881 
1882  // Populate the stored MOST arrays
1883  z0_arr(i,j,k) = z0;
1884  olen_arr(i,j,k) = zref / zeta;
1885  u_star_arr(i,j,k) = mdata.kappa * umm / CmPsim;
1886  t_star_arr(i,j,k) = mdata.kappa * (tm_arr(i,j,k) - t_surf_arr(i,j,k)) / CmPsih;
1887  if (spec_qflux) {
1888  q_surf_arr(i,j,k) = mdata.surf_moist_flux * CmPsih /
1889  (u_star_arr(i,j,k) * mdata.kappa) + qvm_arr(i,j,k);
1890  q_star_arr(i,j,k) = -mdata.surf_moist_flux / u_star_arr(i,j,k);
1891  } else {
1892  q_star_arr(i,j,k) = mdata.kappa * (qvm_arr(i,j,k) - q_surf_arr(i,j,k)) / CmPsih;
1893  }
1894  }
epsv
constexpr amrex::Real epsv
Definition: ERF_Constants.H:52
bogus_large_value
constexpr amrex::Real bogus_large_value
Definition: ERF_Constants.H:19
z0
Real z0
Definition: ERF_InitCustomPertVels_ScalarAdvDiff.H:8
AMREX_ALWAYS_ASSERT_WITH_MESSAGE
AMREX_ALWAYS_ASSERT_WITH_MESSAGE(m_cloud_chamber_config.active, "Cloud Chamber: initializer reached without a parsed configuration")
air_viscosity
AMREX_GPU_DEVICE AMREX_FORCE_INLINE amrex::Real air_viscosity(amrex::Real T_degK)
Definition: ERF_MOSTUtils.H:198
Donelan_roughness
AMREX_GPU_DEVICE AMREX_FORCE_INLINE amrex::Real Donelan_roughness(amrex::Real ustar, amrex::Real nu, bool visc)
Definition: ERF_MOSTUtils.H:293
one
constexpr amrex::Real one
Definition: ERF_NumericalConstants.H:37
zero
constexpr amrex::Real zero
Definition: ERF_NumericalConstants.H:36
Real
amrex::Real Real
Definition: ERF_ShocInterface.H:19
calc_wstar
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=amrex::Real(0))
Definition: ERF_Wstar.H:13
LsmVar_SLM::ustar
@ ustar
Definition: ERF_SLM.H:28
LsmVar_SLM::tstar
@ tstar
Definition: ERF_SLM.H:29
most_data::kappa
amrex::Real kappa
von Karman constant
Definition: ERF_MOSTUtils.H:13
most_data::gravity
amrex::Real gravity
Acceleration due to gravity (m/s^2)
Definition: ERF_MOSTUtils.H:14
most_data::Bjr_beta
const amrex::Real Bjr_beta
Definition: ERF_MOSTUtils.H:29
similarity_funs::calc_psi_h2
AMREX_GPU_HOST_DEVICE AMREX_FORCE_INLINE amrex::Real calc_psi_h2(amrex::Real zeta) const
Definition: ERF_MOSTUtils.H:74
similarity_funs::calc_psi_m2
AMREX_GPU_HOST_DEVICE AMREX_FORCE_INLINE amrex::Real calc_psi_m2(amrex::Real zeta) const
Definition: ERF_MOSTUtils.H:49
surface_temp_donelan::sfuns
similarity_funs sfuns
Definition: ERF_MOSTStress.H:1899
surface_temp_donelan::tol_z
const amrex::Real tol_z
Definition: ERF_MOSTStress.H:1904
surface_temp_donelan::tol
const amrex::Real tol
Definition: ERF_MOSTStress.H:1900
surface_temp_donelan::WSMIN
const amrex::Real WSMIN
Definition: ERF_MOSTStress.H:1907
surface_temp_donelan::alpha
const amrex::Real alpha
Definition: ERF_MOSTStress.H:1906
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Member Data Documentation

◆ alpha

const amrex::Real surface_temp_donelan::alpha = myhalf
private

Referenced by iterate_flux().

◆ mdata

most_data surface_temp_donelan::mdata
private

Referenced by iterate_flux(), and surface_temp_donelan().

◆ sfuns

similarity_funs surface_temp_donelan::sfuns
private

Referenced by iterate_flux().

◆ spec_qflux

bool surface_temp_donelan::spec_qflux
private

Referenced by iterate_flux(), and surface_temp_donelan().

◆ tol

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

Referenced by iterate_flux().

◆ tol_z

const amrex::Real surface_temp_donelan::tol_z = amrex::Real(1.0e-10)
private

Referenced by iterate_flux().

◆ WSMIN

const amrex::Real surface_temp_donelan::WSMIN = most_min_wind_speed
private

Referenced by iterate_flux().

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