1 | SUBROUTINE disturb_field( nzb_uv_inner, dist1, field ) |
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2 | |
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3 | !--------------------------------------------------------------------------------! |
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4 | ! This file is part of PALM. |
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5 | ! |
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6 | ! PALM is free software: you can redistribute it and/or modify it under the terms |
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7 | ! of the GNU General Public License as published by the Free Software Foundation, |
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8 | ! either version 3 of the License, or (at your option) any later 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 1997-2012 Leibniz University 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 | ! Former revisions: |
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24 | ! ----------------- |
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25 | ! $Id: disturb_field.f90 1037 2012-10-22 14:10:22Z raasch $ |
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26 | ! |
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27 | ! 1036 2012-10-22 13:43:42Z raasch |
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28 | ! code put under GPL (PALM 3.9) |
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29 | ! |
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30 | ! 667 2010-12-23 12:06:00Z suehring/gryschka |
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31 | ! nxl-1, nxr+1, nys-1, nyn+1 replaced by nxlg, nxrg, nysg, nyng |
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32 | ! Calls of exchange_horiz are modified. |
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33 | ! |
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34 | ! 420 2010-01-13 15:10:53Z franke |
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35 | ! Loop was split to make runs reproducible when using ifort compiler |
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36 | ! |
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37 | ! 75 2007-03-22 09:54:05Z raasch |
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38 | ! xrp, ynp eliminated, 2nd+3rd argument removed from exchange horiz |
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39 | ! |
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40 | ! RCS Log replace by Id keyword, revision history cleaned up |
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41 | ! |
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42 | ! Revision 1.11 2006/08/04 14:31:59 raasch |
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43 | ! izuf renamed iran |
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44 | ! |
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45 | ! Revision 1.1 1998/02/04 15:40:45 raasch |
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46 | ! Initial revision |
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47 | ! |
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48 | ! |
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49 | ! Description: |
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50 | ! ------------ |
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51 | ! Imposing a random perturbation on a 3D-array. |
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52 | ! On parallel computers, the random number generator is as well called for all |
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53 | ! gridpoints of the total domain to ensure, regardless of the number of PEs |
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54 | ! used, that the elements of the array have the same values in the same |
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55 | ! order in every case. The perturbation range is steered by dist_range. |
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56 | !------------------------------------------------------------------------------! |
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57 | |
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58 | USE control_parameters |
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59 | USE cpulog |
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60 | USE grid_variables |
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61 | USE indices |
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62 | USE interfaces |
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63 | USE random_function_mod |
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64 | |
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65 | IMPLICIT NONE |
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66 | |
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67 | INTEGER :: i, j, k |
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68 | INTEGER :: nzb_uv_inner(nysg:nyng,nxlg:nxrg) |
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69 | |
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70 | REAL :: randomnumber, & |
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71 | dist1(nzb:nzt+1,nysg:nyng,nxlg:nxrg), & |
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72 | field(nzb:nzt+1,nysg:nyng,nxlg:nxrg) |
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73 | REAL, DIMENSION(:,:,:), ALLOCATABLE :: dist2 |
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74 | |
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75 | |
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76 | CALL cpu_log( log_point(20), 'disturb_field', 'start' ) |
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77 | |
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78 | ! |
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79 | !-- Create an additional temporary array and initialize the arrays needed |
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80 | !-- to store the disturbance |
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81 | ALLOCATE( dist2(nzb:nzt+1,nysg:nyng,nxlg:nxrg) ) |
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82 | dist1 = 0.0 |
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83 | dist2 = 0.0 |
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84 | |
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85 | ! |
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86 | !-- Create the random perturbation and store it on temporary array |
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87 | IF ( random_generator == 'numerical-recipes' ) THEN |
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88 | DO i = dist_nxl(dist_range), dist_nxr(dist_range) |
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89 | DO j = dist_nys(dist_range), dist_nyn(dist_range) |
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90 | DO k = disturbance_level_ind_b, disturbance_level_ind_t |
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91 | randomnumber = 3.0 * disturbance_amplitude * & |
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92 | ( random_function( iran ) - 0.5 ) |
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93 | IF ( nxl <= i .AND. nxr >= i .AND. nys <= j .AND. & |
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94 | nyn >= j ) & |
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95 | THEN |
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96 | dist1(k,j,i) = randomnumber |
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97 | ENDIF |
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98 | ENDDO |
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99 | ENDDO |
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100 | ENDDO |
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101 | ELSEIF ( random_generator == 'system-specific' ) THEN |
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102 | DO i = dist_nxl(dist_range), dist_nxr(dist_range) |
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103 | DO j = dist_nys(dist_range), dist_nyn(dist_range) |
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104 | DO k = disturbance_level_ind_b, disturbance_level_ind_t |
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105 | #if defined( __nec ) |
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106 | randomnumber = 3.0 * disturbance_amplitude * & |
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107 | ( RANDOM( 0 ) - 0.5 ) |
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108 | #else |
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109 | CALL RANDOM_NUMBER( randomnumber ) |
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110 | randomnumber = 3.0 * disturbance_amplitude * & |
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111 | ( randomnumber - 0.5 ) |
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112 | #endif |
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113 | IF ( nxl <= i .AND. nxr >= i .AND. nys <= j .AND. nyn >= j ) & |
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114 | THEN |
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115 | dist1(k,j,i) = randomnumber |
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116 | ENDIF |
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117 | ENDDO |
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118 | ENDDO |
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119 | ENDDO |
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120 | |
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121 | ENDIF |
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122 | |
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123 | ! |
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124 | !-- Exchange of ghost points for the random perturbation |
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125 | |
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126 | CALL exchange_horiz( dist1, nbgp ) |
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127 | ! |
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128 | !-- Applying the Shuman filter in order to smooth the perturbations. |
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129 | !-- Neighboured grid points in all three directions are used for the |
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130 | !-- filter operation. |
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131 | !-- Loop has been splitted to make runs reproducible on HLRN systems using |
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132 | !-- compiler option -O3 |
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133 | DO i = nxl, nxr |
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134 | DO j = nys, nyn |
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135 | DO k = disturbance_level_ind_b-1, disturbance_level_ind_t+1 |
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136 | dist2(k,j,i) = ( dist1(k,j,i-1) + dist1(k,j,i+1) & |
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137 | + dist1(k,j+1,i) + dist1(k+1,j,i) & |
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138 | ) / 12.0 |
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139 | ENDDO |
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140 | DO k = disturbance_level_ind_b-1, disturbance_level_ind_t+1 |
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141 | dist2(k,j,i) = dist2(k,j,i) + ( dist1(k,j-1,i) + dist1(k-1,j,i) & |
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142 | + 6.0 * dist1(k,j,i) & |
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143 | ) / 12.0 |
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144 | ENDDO |
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145 | ENDDO |
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146 | ENDDO |
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147 | |
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148 | ! |
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149 | !-- Exchange of ghost points for the filtered perturbation. |
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150 | !-- Afterwards, filter operation and exchange of ghost points are repeated. |
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151 | CALL exchange_horiz( dist2, nbgp ) |
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152 | |
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153 | DO i = nxl, nxr |
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154 | DO j = nys, nyn |
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155 | DO k = disturbance_level_ind_b-2, disturbance_level_ind_t+2 |
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156 | dist1(k,j,i) = ( dist2(k,j,i-1) + dist2(k,j,i+1) + dist2(k,j-1,i) & |
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157 | + dist2(k,j+1,i) + dist2(k+1,j,i) + dist2(k-1,j,i) & |
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158 | + 6.0 * dist2(k,j,i) & |
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159 | ) / 12.0 |
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160 | ENDDO |
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161 | ENDDO |
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162 | ENDDO |
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163 | |
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164 | CALL exchange_horiz( dist1, nbgp ) |
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165 | |
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166 | ! |
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167 | !-- Remove perturbations below topography (including one gridpoint above it |
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168 | !-- in order to allow for larger timesteps at the beginning of the simulation |
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169 | !-- (diffusion criterion)) |
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170 | IF ( TRIM( topography ) /= 'flat' ) THEN |
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171 | DO i = nxlg, nxrg |
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172 | DO j = nysg, nyng |
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173 | dist1(nzb:nzb_uv_inner(j,i)+1,j,i) = 0.0 |
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174 | ENDDO |
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175 | ENDDO |
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176 | ENDIF |
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177 | |
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178 | ! |
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179 | !-- Random perturbation is added to the array to be disturbed. |
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180 | DO i = nxlg, nxrg |
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181 | DO j = nysg, nyng |
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182 | DO k = disturbance_level_ind_b-2, disturbance_level_ind_t+2 |
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183 | field(k,j,i) = field(k,j,i) + dist1(k,j,i) |
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184 | ENDDO |
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185 | ENDDO |
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186 | ENDDO |
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187 | |
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188 | ! |
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189 | !-- Deallocate the temporary array |
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190 | DEALLOCATE( dist2 ) |
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191 | |
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192 | ! |
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193 | !-- Set a flag, which indicates that a random perturbation is imposed |
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194 | disturbance_created = .TRUE. |
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195 | |
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196 | |
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197 | CALL cpu_log( log_point(20), 'disturb_field', 'stop' ) |
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198 | |
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199 | |
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200 | END SUBROUTINE disturb_field |
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