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 1997-2014 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: disturb_field.f90 1354 2014-04-08 15:22:57Z boeske $ |
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27 | ! |
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28 | ! 1353 2014-04-08 15:21:23Z heinze |
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29 | ! REAL constants provided with KIND-attribute |
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30 | ! |
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31 | ! 1322 2014-03-20 16:38:49Z raasch |
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32 | ! REAL constants defined as wp-kind |
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33 | ! |
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34 | ! 1320 2014-03-20 08:40:49Z raasch |
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35 | ! ONLY-attribute added to USE-statements, |
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36 | ! kind-parameters added to all INTEGER and REAL declaration statements, |
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37 | ! kinds are defined in new module kinds, |
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38 | ! revision history before 2012 removed, |
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39 | ! comment fields (!:) to be used for variable explanations added to |
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40 | ! all variable declaration statements |
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41 | ! |
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42 | ! 1036 2012-10-22 13:43:42Z raasch |
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43 | ! code put under GPL (PALM 3.9) |
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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 | ONLY: dist_nxl, dist_nxr, dist_nyn, dist_nys, dist_range, & |
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60 | disturbance_amplitude, disturbance_created, & |
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61 | disturbance_level_ind_b, disturbance_level_ind_t, iran, & |
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62 | random_generator, topography |
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63 | |
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64 | USE cpulog, & |
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65 | ONLY: cpu_log, log_point |
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66 | |
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67 | USE indices, & |
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68 | ONLY: nbgp, nxl, nxlg, nxr, nxrg, nyn, nyng, nys, nysg, nzb, nzt |
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69 | |
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70 | USE kinds |
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71 | |
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72 | USE random_function_mod, & |
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73 | ONLY: random_function |
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74 | |
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75 | IMPLICIT NONE |
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76 | |
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77 | INTEGER(iwp) :: i !: |
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78 | INTEGER(iwp) :: j !: |
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79 | INTEGER(iwp) :: k !: |
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80 | |
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81 | INTEGER(iwp) :: nzb_uv_inner(nysg:nyng,nxlg:nxrg) !: |
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82 | |
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83 | REAL(wp) :: randomnumber !: |
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84 | |
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85 | REAL(wp) :: dist1(nzb:nzt+1,nysg:nyng,nxlg:nxrg) !: |
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86 | REAL(wp) :: field(nzb:nzt+1,nysg:nyng,nxlg:nxrg) !: |
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87 | |
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88 | REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: dist2 !: |
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89 | |
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90 | |
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91 | CALL cpu_log( log_point(20), 'disturb_field', 'start' ) |
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92 | |
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93 | ! |
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94 | !-- Create an additional temporary array and initialize the arrays needed |
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95 | !-- to store the disturbance |
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96 | ALLOCATE( dist2(nzb:nzt+1,nysg:nyng,nxlg:nxrg) ) |
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97 | dist1 = 0.0_wp |
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98 | dist2 = 0.0_wp |
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99 | |
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100 | ! |
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101 | !-- Create the random perturbation and store it on temporary array |
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102 | IF ( random_generator == 'numerical-recipes' ) THEN |
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103 | DO i = dist_nxl(dist_range), dist_nxr(dist_range) |
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104 | DO j = dist_nys(dist_range), dist_nyn(dist_range) |
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105 | DO k = disturbance_level_ind_b, disturbance_level_ind_t |
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106 | randomnumber = 3.0_wp * disturbance_amplitude * & |
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107 | ( random_function( iran ) - 0.5_wp ) |
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108 | IF ( nxl <= i .AND. nxr >= i .AND. nys <= j .AND. & |
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109 | nyn >= j ) & |
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110 | THEN |
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111 | dist1(k,j,i) = randomnumber |
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112 | ENDIF |
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113 | ENDDO |
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114 | ENDDO |
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115 | ENDDO |
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116 | ELSEIF ( random_generator == 'system-specific' ) THEN |
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117 | DO i = dist_nxl(dist_range), dist_nxr(dist_range) |
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118 | DO j = dist_nys(dist_range), dist_nyn(dist_range) |
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119 | DO k = disturbance_level_ind_b, disturbance_level_ind_t |
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120 | #if defined( __nec ) |
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121 | randomnumber = 3.0_wp * disturbance_amplitude * & |
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122 | ( RANDOM( 0 ) - 0.5_wp ) |
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123 | #else |
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124 | CALL RANDOM_NUMBER( randomnumber ) |
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125 | randomnumber = 3.0_wp * disturbance_amplitude * & |
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126 | ( randomnumber - 0.5_wp ) |
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127 | #endif |
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128 | IF ( nxl <= i .AND. nxr >= i .AND. nys <= j .AND. nyn >= j ) & |
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129 | THEN |
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130 | dist1(k,j,i) = randomnumber |
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131 | ENDIF |
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132 | ENDDO |
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133 | ENDDO |
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134 | ENDDO |
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135 | |
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136 | ENDIF |
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137 | |
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138 | ! |
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139 | !-- Exchange of ghost points for the random perturbation |
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140 | |
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141 | CALL exchange_horiz( dist1, nbgp ) |
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142 | ! |
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143 | !-- Applying the Shuman filter in order to smooth the perturbations. |
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144 | !-- Neighboured grid points in all three directions are used for the |
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145 | !-- filter operation. |
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146 | !-- Loop has been splitted to make runs reproducible on HLRN systems using |
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147 | !-- compiler option -O3 |
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148 | DO i = nxl, nxr |
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149 | DO j = nys, nyn |
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150 | DO k = disturbance_level_ind_b-1, disturbance_level_ind_t+1 |
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151 | dist2(k,j,i) = ( dist1(k,j,i-1) + dist1(k,j,i+1) & |
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152 | + dist1(k,j+1,i) + dist1(k+1,j,i) & |
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153 | ) / 12.0_wp |
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154 | ENDDO |
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155 | DO k = disturbance_level_ind_b-1, disturbance_level_ind_t+1 |
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156 | dist2(k,j,i) = dist2(k,j,i) + ( dist1(k,j-1,i) + dist1(k-1,j,i) & |
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157 | + 6.0_wp * dist1(k,j,i) & |
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158 | ) / 12.0_wp |
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159 | ENDDO |
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160 | ENDDO |
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161 | ENDDO |
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162 | |
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163 | ! |
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164 | !-- Exchange of ghost points for the filtered perturbation. |
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165 | !-- Afterwards, filter operation and exchange of ghost points are repeated. |
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166 | CALL exchange_horiz( dist2, nbgp ) |
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167 | |
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168 | DO i = nxl, nxr |
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169 | DO j = nys, nyn |
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170 | DO k = disturbance_level_ind_b-2, disturbance_level_ind_t+2 |
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171 | dist1(k,j,i) = ( dist2(k,j,i-1) + dist2(k,j,i+1) + dist2(k,j-1,i) & |
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172 | + dist2(k,j+1,i) + dist2(k+1,j,i) + dist2(k-1,j,i) & |
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173 | + 6.0_wp * dist2(k,j,i) & |
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174 | ) / 12.0_wp |
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175 | ENDDO |
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176 | ENDDO |
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177 | ENDDO |
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178 | |
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179 | CALL exchange_horiz( dist1, nbgp ) |
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180 | |
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181 | ! |
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182 | !-- Remove perturbations below topography (including one gridpoint above it |
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183 | !-- in order to allow for larger timesteps at the beginning of the simulation |
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184 | !-- (diffusion criterion)) |
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185 | IF ( TRIM( topography ) /= 'flat' ) THEN |
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186 | DO i = nxlg, nxrg |
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187 | DO j = nysg, nyng |
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188 | dist1(nzb:nzb_uv_inner(j,i)+1,j,i) = 0.0_wp |
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189 | ENDDO |
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190 | ENDDO |
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191 | ENDIF |
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192 | |
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193 | ! |
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194 | !-- Random perturbation is added to the array to be disturbed. |
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195 | DO i = nxlg, nxrg |
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196 | DO j = nysg, nyng |
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197 | DO k = disturbance_level_ind_b-2, disturbance_level_ind_t+2 |
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198 | field(k,j,i) = field(k,j,i) + dist1(k,j,i) |
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199 | ENDDO |
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200 | ENDDO |
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201 | ENDDO |
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202 | |
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203 | ! |
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204 | !-- Deallocate the temporary array |
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205 | DEALLOCATE( dist2 ) |
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206 | |
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207 | ! |
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208 | !-- Set a flag, which indicates that a random perturbation is imposed |
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209 | disturbance_created = .TRUE. |
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210 | |
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211 | |
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212 | CALL cpu_log( log_point(20), 'disturb_field', 'stop' ) |
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213 | |
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214 | |
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215 | END SUBROUTINE disturb_field |
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