1 | !> @file diffusivities.f90 |
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2 | !------------------------------------------------------------------------------! |
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3 | ! This file is part of PALM. |
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4 | ! |
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5 | ! PALM is free software: you can redistribute it and/or modify it under the |
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6 | ! terms of the GNU General Public License as published by the Free Software |
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7 | ! Foundation, either version 3 of the License, or (at your option) any later |
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8 | ! version. |
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9 | ! |
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10 | ! PALM is distributed in the hope that it will be useful, but WITHOUT ANY |
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11 | ! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR |
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12 | ! A PARTICULAR PURPOSE. See the GNU General Public License for more details. |
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13 | ! |
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14 | ! You should have received a copy of the GNU General Public License along with |
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15 | ! PALM. If not, see <http://www.gnu.org/licenses/>. |
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16 | ! |
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17 | ! Copyright 1997-2016 Leibniz Universitaet Hannover |
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18 | !------------------------------------------------------------------------------! |
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19 | ! |
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20 | ! Current revisions: |
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21 | ! ----------------- |
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22 | ! |
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23 | ! |
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24 | ! Former revisions: |
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25 | ! ----------------- |
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26 | ! $Id: diffusivities.f90 2032 2016-10-21 15:13:51Z suehring $ |
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27 | ! |
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28 | ! 2031 2016-10-21 15:11:58Z knoop |
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29 | ! renamed variable rho to rho_ocean |
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30 | ! |
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31 | ! 2000 2016-08-20 18:09:15Z knoop |
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32 | ! Forced header and separation lines into 80 columns |
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33 | ! |
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34 | ! 1711 2015-11-05 07:38:04Z raasch |
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35 | ! bugfix: loop moved into IF block to avoid usage of l without being defined |
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36 | ! |
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37 | ! 1682 2015-10-07 23:56:08Z knoop |
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38 | ! Code annotations made doxygen readable |
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39 | ! |
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40 | ! 1374 2014-04-25 12:55:07Z raasch |
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41 | ! rif removed from acc-present-list |
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42 | ! |
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43 | ! 1353 2014-04-08 15:21:23Z heinze |
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44 | ! REAL constants provided with KIND-attribute |
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45 | ! |
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46 | ! 1340 2014-03-25 19:45:13Z kanani |
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47 | ! REAL constants defined as wp-kind |
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48 | ! |
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49 | ! 1322 2014-03-20 16:38:49Z raasch |
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50 | ! REAL constants defined as wp-kind |
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51 | ! |
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52 | ! 1320 2014-03-20 08:40:49Z raasch |
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53 | ! ONLY-attribute added to USE-statements, |
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54 | ! kind-parameters added to all INTEGER and REAL declaration statements, |
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55 | ! kinds are defined in new module kinds, |
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56 | ! revision history before 2012 removed, |
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57 | ! comment fields (!:) to be used for variable explanations added to |
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58 | ! all variable declaration statements |
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59 | ! |
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60 | ! 1179 2013-06-14 05:57:58Z raasch |
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61 | ! use_reference renamed use_single_reference_value |
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62 | ! |
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63 | ! 1036 2012-10-22 13:43:42Z raasch |
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64 | ! code put under GPL (PALM 3.9) |
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65 | ! |
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66 | ! 1015 2012-09-27 09:23:24Z raasch |
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67 | ! OpenACC statements added + code changes required for GPU optimization, |
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68 | ! adjustment of mixing length to the Prandtl mixing length at first grid point |
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69 | ! above ground removed |
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70 | ! |
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71 | ! Revision 1.1 1997/09/19 07:41:10 raasch |
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72 | ! Initial revision |
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73 | ! |
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74 | ! |
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75 | ! Description: |
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76 | ! ------------ |
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77 | !> Computation of the turbulent diffusion coefficients for momentum and heat |
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78 | !> according to Prandtl-Kolmogorov |
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79 | !------------------------------------------------------------------------------! |
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80 | SUBROUTINE diffusivities( var, var_reference ) |
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81 | |
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82 | |
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83 | USE arrays_3d, & |
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84 | ONLY: dd2zu, e, kh, km, l_grid, l_wall |
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85 | |
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86 | USE control_parameters, & |
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87 | ONLY: atmos_ocean_sign, e_min, g, outflow_l, outflow_n, outflow_r, & |
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88 | outflow_s, use_single_reference_value, wall_adjustment |
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89 | |
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90 | USE indices, & |
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91 | ONLY: nxl, nxlg, nxr, nxrg, nyn, nyng, nys, nysg, nzb_s_inner, nzb, nzt |
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92 | USE kinds |
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93 | |
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94 | USE pegrid |
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95 | |
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96 | USE statistics, & |
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97 | ONLY : rmask, statistic_regions, sums_l_l |
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98 | |
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99 | IMPLICIT NONE |
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100 | |
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101 | INTEGER(iwp) :: i !< |
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102 | INTEGER(iwp) :: j !< |
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103 | INTEGER(iwp) :: k !< |
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104 | INTEGER(iwp) :: omp_get_thread_num !< |
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105 | INTEGER(iwp) :: sr !< |
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106 | INTEGER(iwp) :: tn !< |
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107 | |
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108 | REAL(wp) :: dvar_dz !< |
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109 | REAL(wp) :: l !< |
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110 | REAL(wp) :: ll !< |
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111 | REAL(wp) :: l_stable !< |
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112 | REAL(wp) :: sqrt_e !< |
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113 | REAL(wp) :: var_reference !< |
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114 | |
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115 | REAL(wp) :: var(nzb:nzt+1,nysg:nyng,nxlg:nxrg) !< |
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116 | |
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117 | |
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118 | ! |
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119 | !-- Default thread number in case of one thread |
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120 | tn = 0 |
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121 | |
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122 | ! |
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123 | !-- Initialization for calculation of the mixing length profile |
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124 | sums_l_l = 0.0_wp |
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125 | |
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126 | ! |
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127 | !-- Compute the turbulent diffusion coefficient for momentum |
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128 | !$OMP PARALLEL PRIVATE (dvar_dz,i,j,k,l,ll,l_stable,sqrt_e,sr,tn) |
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129 | !$ tn = omp_get_thread_num() |
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130 | |
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131 | ! |
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132 | !-- Data declerations for accelerators |
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133 | !$acc data present( dd2zu, e, km, kh, l_grid, l_wall, nzb_s_inner, var ) |
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134 | !$acc kernels |
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135 | |
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136 | ! |
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137 | !-- Introduce an optional minimum tke |
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138 | IF ( e_min > 0.0_wp ) THEN |
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139 | !$OMP DO |
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140 | !$acc loop |
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141 | DO i = nxlg, nxrg |
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142 | DO j = nysg, nyng |
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143 | !$acc loop vector( 32 ) |
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144 | DO k = 1, nzt |
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145 | IF ( k > nzb_s_inner(j,i) ) THEN |
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146 | e(k,j,i) = MAX( e(k,j,i), e_min ) |
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147 | ENDIF |
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148 | ENDDO |
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149 | ENDDO |
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150 | ENDDO |
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151 | ENDIF |
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152 | |
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153 | !$OMP DO |
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154 | !$acc loop |
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155 | DO i = nxlg, nxrg |
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156 | DO j = nysg, nyng |
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157 | !$acc loop vector( 32 ) |
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158 | DO k = 1, nzt |
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159 | |
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160 | IF ( k > nzb_s_inner(j,i) ) THEN |
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161 | |
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162 | sqrt_e = SQRT( e(k,j,i) ) |
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163 | ! |
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164 | !-- Determine the mixing length |
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165 | dvar_dz = atmos_ocean_sign * & ! inverse effect of pt/rho_ocean gradient |
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166 | ( var(k+1,j,i) - var(k-1,j,i) ) * dd2zu(k) |
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167 | IF ( dvar_dz > 0.0_wp ) THEN |
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168 | IF ( use_single_reference_value ) THEN |
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169 | l_stable = 0.76_wp * sqrt_e / & |
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170 | SQRT( g / var_reference * dvar_dz ) + 1E-5_wp |
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171 | ELSE |
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172 | l_stable = 0.76_wp * sqrt_e / & |
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173 | SQRT( g / var(k,j,i) * dvar_dz ) + 1E-5_wp |
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174 | ENDIF |
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175 | ELSE |
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176 | l_stable = l_grid(k) |
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177 | ENDIF |
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178 | ! |
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179 | !-- Adjustment of the mixing length |
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180 | IF ( wall_adjustment ) THEN |
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181 | l = MIN( l_wall(k,j,i), l_grid(k), l_stable ) |
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182 | ll = MIN( l_wall(k,j,i), l_grid(k) ) |
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183 | ELSE |
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184 | l = MIN( l_grid(k), l_stable ) |
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185 | ll = l_grid(k) |
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186 | ENDIF |
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187 | |
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188 | ! |
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189 | !-- Compute diffusion coefficients for momentum and heat |
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190 | km(k,j,i) = 0.1_wp * l * sqrt_e |
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191 | kh(k,j,i) = ( 1.0_wp + 2.0_wp * l / ll ) * km(k,j,i) |
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192 | |
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193 | #if ! defined( __openacc ) |
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194 | ! |
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195 | !++ Statistics still have to be realized for accelerators |
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196 | !-- Summation for averaged profile (cf. flow_statistics) |
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197 | DO sr = 0, statistic_regions |
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198 | sums_l_l(k,sr,tn) = sums_l_l(k,sr,tn) + l * rmask(j,i,sr) |
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199 | ENDDO |
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200 | #endif |
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201 | ENDIF |
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202 | |
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203 | ENDDO |
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204 | ENDDO |
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205 | ENDDO |
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206 | |
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207 | #if ! defined( __openacc ) |
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208 | ! |
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209 | !++ Statistics still have to be realized for accelerators |
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210 | sums_l_l(nzt+1,:,tn) = sums_l_l(nzt,:,tn) ! quasi boundary-condition for |
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211 | ! data output |
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212 | #endif |
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213 | !$OMP END PARALLEL |
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214 | |
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215 | ! |
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216 | !-- Set vertical boundary values (Neumann conditions both at bottom and top). |
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217 | !-- Horizontal boundary conditions at vertical walls are not set because |
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218 | !-- so far vertical walls require usage of a Prandtl-layer where the boundary |
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219 | !-- values of the diffusivities are not needed |
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220 | !$OMP PARALLEL DO |
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221 | !$acc loop |
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222 | DO i = nxlg, nxrg |
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223 | DO j = nysg, nyng |
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224 | km(nzb_s_inner(j,i),j,i) = km(nzb_s_inner(j,i)+1,j,i) |
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225 | km(nzt+1,j,i) = km(nzt,j,i) |
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226 | kh(nzb_s_inner(j,i),j,i) = kh(nzb_s_inner(j,i)+1,j,i) |
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227 | kh(nzt+1,j,i) = kh(nzt,j,i) |
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228 | ENDDO |
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229 | ENDDO |
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230 | |
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231 | ! |
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232 | !-- Set Neumann boundary conditions at the outflow boundaries in case of |
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233 | !-- non-cyclic lateral boundaries |
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234 | IF ( outflow_l ) THEN |
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235 | km(:,:,nxl-1) = km(:,:,nxl) |
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236 | kh(:,:,nxl-1) = kh(:,:,nxl) |
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237 | ENDIF |
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238 | IF ( outflow_r ) THEN |
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239 | km(:,:,nxr+1) = km(:,:,nxr) |
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240 | kh(:,:,nxr+1) = kh(:,:,nxr) |
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241 | ENDIF |
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242 | IF ( outflow_s ) THEN |
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243 | km(:,nys-1,:) = km(:,nys,:) |
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244 | kh(:,nys-1,:) = kh(:,nys,:) |
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245 | ENDIF |
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246 | IF ( outflow_n ) THEN |
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247 | km(:,nyn+1,:) = km(:,nyn,:) |
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248 | kh(:,nyn+1,:) = kh(:,nyn,:) |
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249 | ENDIF |
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250 | |
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251 | !$acc end kernels |
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252 | !$acc end data |
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253 | |
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254 | END SUBROUTINE diffusivities |
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