| 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 1426 2014-07-05 11:00:42Z witha $ |
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| 27 | ! |
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| 28 | ! 1425 2014-07-05 10:57:53Z knoop |
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| 29 | ! bugfix: Parallel random number generator loop: print-statement no needed |
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| 30 | ! |
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| 31 | ! 1400 2014-05-09 14:03:54Z knoop |
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| 32 | ! Parallel random number generator added |
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| 33 | ! |
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| 34 | ! 1353 2014-04-08 15:21:23Z heinze |
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| 35 | ! REAL constants provided with KIND-attribute |
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| 36 | ! |
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| 37 | ! 1322 2014-03-20 16:38:49Z raasch |
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| 38 | ! REAL constants defined as wp-kind |
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| 39 | ! |
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| 40 | ! 1320 2014-03-20 08:40:49Z raasch |
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| 41 | ! ONLY-attribute added to USE-statements, |
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| 42 | ! kind-parameters added to all INTEGER and REAL declaration statements, |
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| 43 | ! kinds are defined in new module kinds, |
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| 44 | ! revision history before 2012 removed, |
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| 45 | ! comment fields (!:) to be used for variable explanations added to |
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| 46 | ! all variable declaration statements |
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| 47 | ! |
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| 48 | ! 1036 2012-10-22 13:43:42Z raasch |
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| 49 | ! code put under GPL (PALM 3.9) |
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| 50 | ! |
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| 51 | ! Revision 1.1 1998/02/04 15:40:45 raasch |
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| 52 | ! Initial revision |
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| 53 | ! |
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| 54 | ! |
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| 55 | ! Description: |
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| 56 | ! ------------ |
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| 57 | ! Imposing a random perturbation on a 3D-array. |
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| 58 | ! On parallel computers, the random number generator is as well called for all |
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| 59 | ! gridpoints of the total domain to ensure, regardless of the number of PEs |
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| 60 | ! used, that the elements of the array have the same values in the same |
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| 61 | ! order in every case. The perturbation range is steered by dist_range. |
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| 62 | !------------------------------------------------------------------------------! |
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| 63 | |
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| 64 | USE control_parameters, & |
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| 65 | ONLY: dist_nxl, dist_nxr, dist_nyn, dist_nys, dist_range, & |
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| 66 | disturbance_amplitude, disturbance_created, & |
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| 67 | disturbance_level_ind_b, disturbance_level_ind_t, iran, & |
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| 68 | random_generator, topography |
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| 69 | |
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| 70 | USE cpulog, & |
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| 71 | ONLY: cpu_log, log_point |
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| 72 | |
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| 73 | USE indices, & |
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| 74 | ONLY: nbgp, nxl, nxlg, nxr, nxrg, nyn, nyng, nys, nysg, nzb, nzt |
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| 75 | |
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| 76 | USE kinds |
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| 77 | |
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| 78 | USE random_function_mod, & |
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| 79 | ONLY: random_function |
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| 80 | |
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| 81 | USE random_generator_parallel, & |
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| 82 | ONLY: random_number_parallel, random_seed_parallel, random_dummy, & |
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| 83 | id_random_array, seq_random_array |
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| 84 | |
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| 85 | IMPLICIT NONE |
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| 86 | |
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| 87 | INTEGER(iwp) :: i !: |
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| 88 | INTEGER(iwp) :: j !: |
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| 89 | INTEGER(iwp) :: k !: |
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| 90 | |
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| 91 | INTEGER(iwp) :: nzb_uv_inner(nysg:nyng,nxlg:nxrg) !: |
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| 92 | |
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| 93 | REAL(wp) :: randomnumber !: |
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| 94 | |
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| 95 | REAL(wp) :: dist1(nzb:nzt+1,nysg:nyng,nxlg:nxrg) !: |
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| 96 | REAL(wp) :: field(nzb:nzt+1,nysg:nyng,nxlg:nxrg) !: |
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| 97 | |
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| 98 | REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: dist2 !: |
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| 99 | |
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| 100 | |
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| 101 | CALL cpu_log( log_point(20), 'disturb_field', 'start' ) |
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| 102 | |
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| 103 | ! |
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| 104 | !-- Create an additional temporary array and initialize the arrays needed |
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| 105 | !-- to store the disturbance |
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| 106 | ALLOCATE( dist2(nzb:nzt+1,nysg:nyng,nxlg:nxrg) ) |
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| 107 | dist1 = 0.0_wp |
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| 108 | dist2 = 0.0_wp |
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| 109 | |
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| 110 | ! |
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| 111 | !-- Create the random perturbation and store it on temporary array |
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| 112 | IF ( random_generator == 'numerical-recipes' ) THEN |
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| 113 | DO i = dist_nxl(dist_range), dist_nxr(dist_range) |
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| 114 | DO j = dist_nys(dist_range), dist_nyn(dist_range) |
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| 115 | DO k = disturbance_level_ind_b, disturbance_level_ind_t |
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| 116 | randomnumber = 3.0_wp * disturbance_amplitude * & |
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| 117 | ( random_function( iran ) - 0.5_wp ) |
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| 118 | IF ( nxl <= i .AND. nxr >= i .AND. nys <= j .AND. & |
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| 119 | nyn >= j ) & |
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| 120 | THEN |
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| 121 | dist1(k,j,i) = randomnumber |
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| 122 | ENDIF |
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| 123 | ENDDO |
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| 124 | ENDDO |
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| 125 | ENDDO |
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| 126 | ELSEIF ( random_generator == 'random-parallel' ) THEN |
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| 127 | DO i = dist_nxl(dist_range), dist_nxr(dist_range) |
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| 128 | DO j = dist_nys(dist_range), dist_nyn(dist_range) |
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| 129 | CALL random_seed_parallel( put=seq_random_array(:, j, i) ) |
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| 130 | DO k = disturbance_level_ind_b, disturbance_level_ind_t |
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| 131 | CALL random_number_parallel( random_dummy ) |
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| 132 | randomnumber = 3.0_wp * disturbance_amplitude * & |
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| 133 | ( random_dummy - 0.5_wp ) |
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| 134 | IF ( nxl <= i .AND. nxr >= i .AND. nys <= j .AND. & |
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| 135 | nyn >= j ) & |
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| 136 | THEN |
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| 137 | dist1(k,j,i) = randomnumber |
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| 138 | ENDIF |
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| 139 | ENDDO |
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| 140 | CALL random_seed_parallel( get=seq_random_array(:, j, i) ) |
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| 141 | ENDDO |
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| 142 | ENDDO |
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| 143 | ELSEIF ( random_generator == 'system-specific' ) THEN |
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| 144 | DO i = dist_nxl(dist_range), dist_nxr(dist_range) |
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| 145 | DO j = dist_nys(dist_range), dist_nyn(dist_range) |
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| 146 | DO k = disturbance_level_ind_b, disturbance_level_ind_t |
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| 147 | #if defined( __nec ) |
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| 148 | randomnumber = 3.0_wp * disturbance_amplitude * & |
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| 149 | ( RANDOM( 0 ) - 0.5_wp ) |
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| 150 | #else |
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| 151 | CALL RANDOM_NUMBER( randomnumber ) |
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| 152 | randomnumber = 3.0_wp * disturbance_amplitude * & |
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| 153 | ( randomnumber - 0.5_wp ) |
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| 154 | #endif |
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| 155 | IF ( nxl <= i .AND. nxr >= i .AND. nys <= j .AND. nyn >= j ) & |
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| 156 | THEN |
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| 157 | dist1(k,j,i) = randomnumber |
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| 158 | ENDIF |
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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 | ENDIF |
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| 164 | |
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| 165 | ! |
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| 166 | !-- Exchange of ghost points for the random perturbation |
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| 167 | |
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| 168 | CALL exchange_horiz( dist1, nbgp ) |
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| 169 | ! |
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| 170 | !-- Applying the Shuman filter in order to smooth the perturbations. |
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| 171 | !-- Neighboured grid points in all three directions are used for the |
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| 172 | !-- filter operation. |
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| 173 | !-- Loop has been splitted to make runs reproducible on HLRN systems using |
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| 174 | !-- compiler option -O3 |
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| 175 | DO i = nxl, nxr |
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| 176 | DO j = nys, nyn |
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| 177 | DO k = disturbance_level_ind_b-1, disturbance_level_ind_t+1 |
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| 178 | dist2(k,j,i) = ( dist1(k,j,i-1) + dist1(k,j,i+1) & |
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| 179 | + dist1(k,j+1,i) + dist1(k+1,j,i) & |
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| 180 | ) / 12.0_wp |
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| 181 | ENDDO |
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| 182 | DO k = disturbance_level_ind_b-1, disturbance_level_ind_t+1 |
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| 183 | dist2(k,j,i) = dist2(k,j,i) + ( dist1(k,j-1,i) + dist1(k-1,j,i) & |
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| 184 | + 6.0_wp * dist1(k,j,i) & |
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| 185 | ) / 12.0_wp |
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| 186 | ENDDO |
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| 187 | ENDDO |
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| 188 | ENDDO |
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| 189 | |
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| 190 | ! |
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| 191 | !-- Exchange of ghost points for the filtered perturbation. |
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| 192 | !-- Afterwards, filter operation and exchange of ghost points are repeated. |
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| 193 | CALL exchange_horiz( dist2, nbgp ) |
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| 194 | |
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| 195 | DO i = nxl, nxr |
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| 196 | DO j = nys, nyn |
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| 197 | DO k = disturbance_level_ind_b-2, disturbance_level_ind_t+2 |
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| 198 | dist1(k,j,i) = ( dist2(k,j,i-1) + dist2(k,j,i+1) + dist2(k,j-1,i) & |
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| 199 | + dist2(k,j+1,i) + dist2(k+1,j,i) + dist2(k-1,j,i) & |
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| 200 | + 6.0_wp * dist2(k,j,i) & |
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| 201 | ) / 12.0_wp |
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| 202 | ENDDO |
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| 203 | ENDDO |
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| 204 | ENDDO |
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| 205 | |
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| 206 | CALL exchange_horiz( dist1, nbgp ) |
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| 207 | |
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| 208 | ! |
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| 209 | !-- Remove perturbations below topography (including one gridpoint above it |
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| 210 | !-- in order to allow for larger timesteps at the beginning of the simulation |
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| 211 | !-- (diffusion criterion)) |
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| 212 | IF ( TRIM( topography ) /= 'flat' ) THEN |
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| 213 | DO i = nxlg, nxrg |
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| 214 | DO j = nysg, nyng |
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| 215 | dist1(nzb:nzb_uv_inner(j,i)+1,j,i) = 0.0_wp |
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| 216 | ENDDO |
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| 217 | ENDDO |
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| 218 | ENDIF |
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| 219 | |
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| 220 | ! |
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| 221 | !-- Random perturbation is added to the array to be disturbed. |
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| 222 | DO i = nxlg, nxrg |
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| 223 | DO j = nysg, nyng |
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| 224 | DO k = disturbance_level_ind_b-2, disturbance_level_ind_t+2 |
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| 225 | field(k,j,i) = field(k,j,i) + dist1(k,j,i) |
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| 226 | ENDDO |
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| 227 | ENDDO |
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| 228 | ENDDO |
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| 229 | |
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| 230 | ! |
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| 231 | !-- Deallocate the temporary array |
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| 232 | DEALLOCATE( dist2 ) |
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| 233 | |
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| 234 | ! |
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| 235 | !-- Set a flag, which indicates that a random perturbation is imposed |
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| 236 | disturbance_created = .TRUE. |
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| 237 | |
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| 238 | |
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| 239 | CALL cpu_log( log_point(20), 'disturb_field', 'stop' ) |
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| 240 | |
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| 241 | |
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| 242 | END SUBROUTINE disturb_field |
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