1 | SUBROUTINE poismg( r ) |
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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 | ! Attention: Loop unrolling and cache optimization in SOR-Red/Black method |
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21 | ! still does not give the expected speedup! Further work required. |
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22 | ! |
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23 | ! Current revisions: |
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24 | ! ----------------- |
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25 | ! module interfaces removed |
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26 | ! |
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27 | ! Former revisions: |
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28 | ! ----------------- |
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29 | ! $Id: poismg.f90 1318 2014-03-17 13:35:16Z raasch $ |
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30 | ! |
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31 | ! 1159 2013-05-21 11:58:22Z fricke |
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32 | ! bc_lr/ns_dirneu/neudir removed |
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33 | ! |
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34 | ! 1092 2013-02-02 11:24:22Z raasch |
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35 | ! unused variables removed |
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36 | ! |
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37 | ! 1056 2012-11-16 15:28:04Z raasch |
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38 | ! Bugfix: all ghost points have to be used for allocating p3 |
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39 | ! arrays p2, f2, and f2_l changed from allocatable to automatic |
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40 | ! |
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41 | ! 1036 2012-10-22 13:43:42Z raasch |
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42 | ! code put under GPL (PALM 3.9) |
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43 | ! |
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44 | ! 996 2012-09-07 10:41:47Z raasch |
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45 | ! little reformatting |
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46 | ! |
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47 | ! 978 2012-08-09 08:28:32Z fricke |
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48 | ! bc_lr/ns_dirneu/neudir added |
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49 | ! |
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50 | ! 880 2012-04-13 06:28:59Z raasch |
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51 | ! Bugfix: preprocessor statements for parallel execution added |
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52 | ! |
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53 | ! 778 2011-11-07 14:18:25Z fricke |
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54 | ! Allocation of p3 changes when multigrid is used and the collected field on PE0 |
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55 | ! has more grid points than the subdomain of an PE. |
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56 | ! |
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57 | ! 707 2011-03-29 11:39:40Z raasch |
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58 | ! p_loc is used instead of p in the main routine (poismg). |
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59 | ! On coarse grid levels, gathered data are identically processed on all PEs |
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60 | ! (before, on PE0 only), so that the subsequent scattering of data is not |
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61 | ! neccessary any more. |
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62 | ! bc_lr/ns replaced by bc_lr/ns_cyc/dirrad/raddir |
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63 | ! Bugfix: bottom (nzb) and top (nzt+1) boundary conditions set in routines |
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64 | ! resid and restrict. They were missed before which may have led to |
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65 | ! unpredictable results. |
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66 | ! |
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67 | ! 667 2010-12-23 12:06:00Z suehring/gryschka |
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68 | ! Calls of exchange_horiz are modified. |
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69 | ! |
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70 | ! 622 2010-12-10 08:08:13Z raasch |
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71 | ! optional barriers included in order to speed up collective operations |
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72 | ! |
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73 | ! 257 2009-03-11 15:17:42Z heinze |
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74 | ! Output of messages replaced by message handling routine. |
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75 | ! |
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76 | ! 181 2008-07-30 07:07:47Z raasch |
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77 | ! Bugfix: grid_level+1 has to be used in restrict for flags-array |
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78 | ! |
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79 | ! 114 2007-10-10 00:03:15Z raasch |
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80 | ! Boundary conditions at walls are implicitly set using flag arrays. Only |
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81 | ! Neumann BC is allowed. Upper walls are still not realized. |
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82 | ! Bottom and top BCs for array f_mg in restrict removed because boundary |
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83 | ! values are not needed (right hand side of SOR iteration). |
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84 | ! |
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85 | ! 75 2007-03-22 09:54:05Z raasch |
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86 | ! 2nd+3rd argument removed from exchange horiz |
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87 | ! |
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88 | ! RCS Log replace by Id keyword, revision history cleaned up |
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89 | ! |
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90 | ! Revision 1.6 2005/03/26 20:55:54 raasch |
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91 | ! Implementation of non-cyclic (Neumann) horizontal boundary conditions, |
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92 | ! routine prolong simplified (one call of exchange_horiz spared) |
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93 | ! |
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94 | ! Revision 1.1 2001/07/20 13:10:51 raasch |
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95 | ! Initial revision |
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96 | ! |
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97 | ! |
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98 | ! Description: |
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99 | ! ------------ |
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100 | ! Solves the Poisson equation for the perturbation pressure with a multigrid |
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101 | ! V- or W-Cycle scheme. |
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102 | ! |
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103 | ! This multigrid method was originally developed for PALM by Joerg Uhlenbrock, |
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104 | ! September 2000 - July 2001. |
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105 | !------------------------------------------------------------------------------! |
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106 | |
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107 | USE arrays_3d |
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108 | USE control_parameters |
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109 | USE cpulog |
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110 | USE grid_variables |
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111 | USE indices |
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112 | USE pegrid |
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113 | |
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114 | IMPLICIT NONE |
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115 | |
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116 | REAL :: maxerror, maximum_mgcycles, residual_norm |
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117 | |
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118 | REAL, DIMENSION(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1) :: r |
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119 | |
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120 | REAL, DIMENSION(:,:,:), ALLOCATABLE :: p3 |
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121 | |
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122 | |
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123 | CALL cpu_log( log_point_s(29), 'poismg', 'start' ) |
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124 | ! |
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125 | !-- Initialize arrays and variables used in this subroutine |
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126 | |
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127 | !-- If the number of grid points of the gathered grid, which is collected |
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128 | !-- on PE0, is larger than the number of grid points of an PE, than array |
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129 | !-- p3 will be enlarged. |
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130 | IF ( gathered_size > subdomain_size ) THEN |
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131 | ALLOCATE( p3(nzb:nzt_mg(mg_switch_to_pe0_level)+1,nys_mg( & |
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132 | mg_switch_to_pe0_level)-1:nyn_mg(mg_switch_to_pe0_level)+1,& |
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133 | nxl_mg(mg_switch_to_pe0_level)-1:nxr_mg( & |
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134 | mg_switch_to_pe0_level)+1) ) |
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135 | ELSE |
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136 | ALLOCATE ( p3(nzb:nzt+1,nysg:nyng,nxlg:nxrg) ) |
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137 | ENDIF |
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138 | |
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139 | p3 = 0.0 |
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140 | |
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141 | ! |
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142 | !-- Ghost boundaries have to be added to divergence array. |
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143 | !-- Exchange routine needs to know the grid level! |
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144 | grid_level = maximum_grid_level |
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145 | CALL exchange_horiz( d, 1) |
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146 | d(nzb,:,:) = d(nzb+1,:,:) |
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147 | |
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148 | ! |
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149 | !-- Initiation of the multigrid scheme. Does n cycles until the |
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150 | !-- residual is smaller than the given limit. The accuracy of the solution |
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151 | !-- of the poisson equation will increase with the number of cycles. |
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152 | !-- If the number of cycles is preset by the user, this number will be |
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153 | !-- carried out regardless of the accuracy. |
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154 | grid_level_count = 0 |
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155 | mgcycles = 0 |
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156 | IF ( mg_cycles == -1 ) THEN |
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157 | maximum_mgcycles = 0 |
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158 | residual_norm = 1.0 |
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159 | ELSE |
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160 | maximum_mgcycles = mg_cycles |
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161 | residual_norm = 0.0 |
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162 | ENDIF |
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163 | |
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164 | DO WHILE ( residual_norm > residual_limit .OR. & |
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165 | mgcycles < maximum_mgcycles ) |
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166 | |
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167 | CALL next_mg_level( d, p_loc, p3, r) |
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168 | |
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169 | ! |
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170 | !-- Calculate the residual if the user has not preset the number of |
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171 | !-- cycles to be performed |
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172 | IF ( maximum_mgcycles == 0 ) THEN |
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173 | CALL resid( d, p_loc, r ) |
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174 | maxerror = SUM( r(nzb+1:nzt,nys:nyn,nxl:nxr)**2 ) |
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175 | |
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176 | #if defined( __parallel ) |
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177 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
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178 | CALL MPI_ALLREDUCE( maxerror, residual_norm, 1, MPI_REAL, MPI_SUM, & |
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179 | comm2d, ierr) |
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180 | #else |
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181 | residual_norm = maxerror |
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182 | #endif |
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183 | residual_norm = SQRT( residual_norm ) |
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184 | ENDIF |
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185 | |
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186 | mgcycles = mgcycles + 1 |
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187 | |
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188 | ! |
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189 | !-- If the user has not limited the number of cycles, stop the run in case |
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190 | !-- of insufficient convergence |
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191 | IF ( mgcycles > 1000 .AND. mg_cycles == -1 ) THEN |
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192 | message_string = 'no sufficient convergence within 1000 cycles' |
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193 | CALL message( 'poismg', 'PA0283', 1, 2, 0, 6, 0 ) |
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194 | ENDIF |
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195 | |
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196 | ENDDO |
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197 | |
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198 | DEALLOCATE( p3 ) |
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199 | |
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200 | ! |
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201 | !-- Unset the grid level. Variable is used to determine the MPI datatypes for |
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202 | !-- ghost point exchange |
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203 | grid_level = 0 |
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204 | |
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205 | CALL cpu_log( log_point_s(29), 'poismg', 'stop' ) |
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206 | |
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207 | END SUBROUTINE poismg |
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208 | |
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209 | |
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210 | |
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211 | SUBROUTINE resid( f_mg, p_mg, r ) |
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212 | |
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213 | !------------------------------------------------------------------------------! |
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214 | ! Description: |
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215 | ! ------------ |
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216 | ! Computes the residual of the perturbation pressure. |
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217 | !------------------------------------------------------------------------------! |
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218 | |
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219 | USE arrays_3d |
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220 | USE control_parameters |
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221 | USE grid_variables |
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222 | USE indices |
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223 | USE pegrid |
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224 | |
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225 | IMPLICIT NONE |
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226 | |
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227 | INTEGER :: i, j, k, l |
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228 | |
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229 | REAL, DIMENSION(nzb:nzt_mg(grid_level)+1, & |
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230 | nys_mg(grid_level)-1:nyn_mg(grid_level)+1, & |
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231 | nxl_mg(grid_level)-1:nxr_mg(grid_level)+1) :: f_mg, p_mg, r |
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232 | |
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233 | ! |
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234 | !-- Calculate the residual |
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235 | l = grid_level |
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236 | |
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237 | ! |
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238 | !-- Choose flag array of this level |
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239 | SELECT CASE ( l ) |
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240 | CASE ( 1 ) |
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241 | flags => wall_flags_1 |
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242 | CASE ( 2 ) |
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243 | flags => wall_flags_2 |
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244 | CASE ( 3 ) |
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245 | flags => wall_flags_3 |
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246 | CASE ( 4 ) |
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247 | flags => wall_flags_4 |
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248 | CASE ( 5 ) |
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249 | flags => wall_flags_5 |
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250 | CASE ( 6 ) |
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251 | flags => wall_flags_6 |
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252 | CASE ( 7 ) |
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253 | flags => wall_flags_7 |
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254 | CASE ( 8 ) |
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255 | flags => wall_flags_8 |
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256 | CASE ( 9 ) |
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257 | flags => wall_flags_9 |
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258 | CASE ( 10 ) |
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259 | flags => wall_flags_10 |
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260 | END SELECT |
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261 | |
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262 | !$OMP PARALLEL PRIVATE (i,j,k) |
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263 | !$OMP DO |
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264 | DO i = nxl_mg(l), nxr_mg(l) |
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265 | DO j = nys_mg(l), nyn_mg(l) |
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266 | DO k = nzb+1, nzt_mg(l) |
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267 | r(k,j,i) = f_mg(k,j,i) & |
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268 | - ddx2_mg(l) * & |
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269 | ( p_mg(k,j,i+1) + IBITS( flags(k,j,i), 5, 1 ) * & |
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270 | ( p_mg(k,j,i) - p_mg(k,j,i+1) ) + & |
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271 | p_mg(k,j,i-1) + IBITS( flags(k,j,i), 4, 1 ) * & |
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272 | ( p_mg(k,j,i) - p_mg(k,j,i-1) ) ) & |
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273 | - ddy2_mg(l) * & |
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274 | ( p_mg(k,j+1,i) + IBITS( flags(k,j,i), 3, 1 ) * & |
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275 | ( p_mg(k,j,i) - p_mg(k,j+1,i) ) + & |
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276 | p_mg(k,j-1,i) + IBITS( flags(k,j,i), 2, 1 ) * & |
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277 | ( p_mg(k,j,i) - p_mg(k,j-1,i) ) ) & |
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278 | - f2_mg(k,l) * p_mg(k+1,j,i) & |
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279 | - f3_mg(k,l) * & |
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280 | ( p_mg(k-1,j,i) + IBITS( flags(k,j,i), 0, 1 ) * & |
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281 | ( p_mg(k,j,i) - p_mg(k-1,j,i) ) ) & |
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282 | + f1_mg(k,l) * p_mg(k,j,i) |
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283 | ! |
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284 | !-- Residual within topography should be zero |
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285 | r(k,j,i) = r(k,j,i) * ( 1.0 - IBITS( flags(k,j,i), 6, 1 ) ) |
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286 | ENDDO |
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287 | ENDDO |
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288 | ENDDO |
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289 | !$OMP END PARALLEL |
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290 | |
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291 | ! |
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292 | !-- Horizontal boundary conditions |
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293 | CALL exchange_horiz( r, 1) |
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294 | |
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295 | IF ( .NOT. bc_lr_cyc ) THEN |
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296 | IF ( inflow_l .OR. outflow_l ) r(:,:,nxl_mg(l)-1) = r(:,:,nxl_mg(l)) |
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297 | IF ( inflow_r .OR. outflow_r ) r(:,:,nxr_mg(l)+1) = r(:,:,nxr_mg(l)) |
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298 | ENDIF |
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299 | |
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300 | IF ( .NOT. bc_ns_cyc ) THEN |
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301 | IF ( inflow_n .OR. outflow_n ) r(:,nyn_mg(l)+1,:) = r(:,nyn_mg(l),:) |
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302 | IF ( inflow_s .OR. outflow_s ) r(:,nys_mg(l)-1,:) = r(:,nys_mg(l),:) |
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303 | ENDIF |
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304 | |
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305 | ! |
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306 | !-- Boundary conditions at bottom and top of the domain. |
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307 | !-- These points are not handled by the above loop. Points may be within |
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308 | !-- buildings, but that doesn't matter. |
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309 | IF ( ibc_p_b == 1 ) THEN |
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310 | r(nzb,:,: ) = r(nzb+1,:,:) |
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311 | ELSE |
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312 | r(nzb,:,: ) = 0.0 |
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313 | ENDIF |
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314 | |
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315 | IF ( ibc_p_t == 1 ) THEN |
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316 | r(nzt_mg(l)+1,:,: ) = r(nzt_mg(l),:,:) |
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317 | ELSE |
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318 | r(nzt_mg(l)+1,:,: ) = 0.0 |
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319 | ENDIF |
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320 | |
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321 | |
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322 | END SUBROUTINE resid |
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323 | |
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324 | |
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325 | |
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326 | SUBROUTINE restrict( f_mg, r ) |
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327 | |
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328 | !------------------------------------------------------------------------------! |
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329 | ! Description: |
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330 | ! ------------ |
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331 | ! Interpolates the residual on the next coarser grid with "full weighting" |
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332 | ! scheme |
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333 | !------------------------------------------------------------------------------! |
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334 | |
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335 | USE control_parameters |
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336 | USE grid_variables |
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337 | USE indices |
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338 | USE pegrid |
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339 | |
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340 | IMPLICIT NONE |
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341 | |
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342 | INTEGER :: i, ic, j, jc, k, kc, l |
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343 | |
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344 | REAL :: rkjim, rkjip, rkjmi, rkjmim, rkjmip, rkjpi, rkjpim, rkjpip, & |
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345 | rkmji, rkmjim, rkmjip, rkmjmi, rkmjmim, rkmjmip, rkmjpi, rkmjpim, & |
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346 | rkmjpip |
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347 | |
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348 | REAL, DIMENSION(nzb:nzt_mg(grid_level)+1, & |
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349 | nys_mg(grid_level)-1:nyn_mg(grid_level)+1, & |
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350 | nxl_mg(grid_level)-1:nxr_mg(grid_level)+1) :: f_mg |
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351 | |
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352 | REAL, DIMENSION(nzb:nzt_mg(grid_level+1)+1, & |
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353 | nys_mg(grid_level+1)-1:nyn_mg(grid_level+1)+1, & |
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354 | nxl_mg(grid_level+1)-1:nxr_mg(grid_level+1)+1) :: r |
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355 | |
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356 | ! |
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357 | !-- Interpolate the residual |
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358 | l = grid_level |
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359 | |
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360 | ! |
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361 | !-- Choose flag array of the upper level |
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362 | SELECT CASE ( l+1 ) |
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363 | CASE ( 1 ) |
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364 | flags => wall_flags_1 |
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365 | CASE ( 2 ) |
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366 | flags => wall_flags_2 |
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367 | CASE ( 3 ) |
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368 | flags => wall_flags_3 |
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369 | CASE ( 4 ) |
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370 | flags => wall_flags_4 |
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371 | CASE ( 5 ) |
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372 | flags => wall_flags_5 |
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373 | CASE ( 6 ) |
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374 | flags => wall_flags_6 |
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375 | CASE ( 7 ) |
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376 | flags => wall_flags_7 |
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377 | CASE ( 8 ) |
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378 | flags => wall_flags_8 |
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379 | CASE ( 9 ) |
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380 | flags => wall_flags_9 |
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381 | CASE ( 10 ) |
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382 | flags => wall_flags_10 |
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383 | END SELECT |
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384 | |
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385 | !$OMP PARALLEL PRIVATE (i,j,k,ic,jc,kc) |
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386 | !$OMP DO |
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387 | DO ic = nxl_mg(l), nxr_mg(l) |
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388 | i = 2*ic |
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389 | DO jc = nys_mg(l), nyn_mg(l) |
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390 | j = 2*jc |
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391 | DO kc = nzb+1, nzt_mg(l) |
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392 | k = 2*kc-1 |
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393 | ! |
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394 | !-- Use implicit Neumann BCs if the respective gridpoint is inside |
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395 | !-- the building |
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396 | rkjim = r(k,j,i-1) + IBITS( flags(k,j,i-1), 6, 1 ) * & |
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397 | ( r(k,j,i) - r(k,j,i-1) ) |
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398 | rkjip = r(k,j,i+1) + IBITS( flags(k,j,i+1), 6, 1 ) * & |
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399 | ( r(k,j,i) - r(k,j,i+1) ) |
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400 | rkjpi = r(k,j+1,i) + IBITS( flags(k,j+1,i), 6, 1 ) * & |
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401 | ( r(k,j,i) - r(k,j+1,i) ) |
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402 | rkjmi = r(k,j-1,i) + IBITS( flags(k,j-1,i), 6, 1 ) * & |
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403 | ( r(k,j,i) - r(k,j-1,i) ) |
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404 | rkjmim = r(k,j-1,i-1) + IBITS( flags(k,j-1,i-1), 6, 1 ) * & |
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405 | ( r(k,j,i) - r(k,j-1,i-1) ) |
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406 | rkjpim = r(k,j+1,i-1) + IBITS( flags(k,j+1,i-1), 6, 1 ) * & |
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407 | ( r(k,j,i) - r(k,j+1,i-1) ) |
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408 | rkjmip = r(k,j-1,i+1) + IBITS( flags(k,j-1,i+1), 6, 1 ) * & |
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409 | ( r(k,j,i) - r(k,j-1,i+1) ) |
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410 | rkjpip = r(k,j+1,i+1) + IBITS( flags(k,j+1,i+1), 6, 1 ) * & |
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411 | ( r(k,j,i) - r(k,j+1,i+1) ) |
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412 | rkmji = r(k-1,j,i) + IBITS( flags(k-1,j,i), 6, 1 ) * & |
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413 | ( r(k,j,i) - r(k-1,j,i) ) |
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414 | rkmjim = r(k-1,j,i-1) + IBITS( flags(k-1,j,i-1), 6, 1 ) * & |
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415 | ( r(k,j,i) - r(k-1,j,i-1) ) |
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416 | rkmjip = r(k-1,j,i+1) + IBITS( flags(k-1,j,i+1), 6, 1 ) * & |
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417 | ( r(k,j,i) - r(k-1,j,i+1) ) |
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418 | rkmjpi = r(k-1,j+1,i) + IBITS( flags(k-1,j+1,i), 6, 1 ) * & |
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419 | ( r(k,j,i) - r(k-1,j+1,i) ) |
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420 | rkmjmi = r(k-1,j-1,i) + IBITS( flags(k-1,j-1,i), 6, 1 ) * & |
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421 | ( r(k,j,i) - r(k-1,j-1,i) ) |
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422 | rkmjmim = r(k-1,j-1,i-1) + IBITS( flags(k-1,j-1,i-1), 6, 1 ) * & |
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423 | ( r(k,j,i) - r(k-1,j-1,i-1) ) |
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424 | rkmjpim = r(k-1,j+1,i-1) + IBITS( flags(k-1,j+1,i-1), 6, 1 ) * & |
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425 | ( r(k,j,i) - r(k-1,j+1,i-1) ) |
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426 | rkmjmip = r(k-1,j-1,i+1) + IBITS( flags(k-1,j-1,i+1), 6, 1 ) * & |
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427 | ( r(k,j,i) - r(k-1,j-1,i+1) ) |
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428 | rkmjpip = r(k-1,j+1,i+1) + IBITS( flags(k-1,j+1,i+1), 6, 1 ) * & |
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429 | ( r(k,j,i) - r(k-1,j+1,i+1) ) |
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430 | |
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431 | f_mg(kc,jc,ic) = 1.0 / 64.0 * ( & |
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432 | 8.0 * r(k,j,i) & |
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433 | + 4.0 * ( rkjim + rkjip + & |
---|
434 | rkjpi + rkjmi ) & |
---|
435 | + 2.0 * ( rkjmim + rkjpim + & |
---|
436 | rkjmip + rkjpip ) & |
---|
437 | + 4.0 * rkmji & |
---|
438 | + 2.0 * ( rkmjim + rkmjim + & |
---|
439 | rkmjpi + rkmjmi ) & |
---|
440 | + ( rkmjmim + rkmjpim + & |
---|
441 | rkmjmip + rkmjpip ) & |
---|
442 | + 4.0 * r(k+1,j,i) & |
---|
443 | + 2.0 * ( r(k+1,j,i-1) + r(k+1,j,i+1) + & |
---|
444 | r(k+1,j+1,i) + r(k+1,j-1,i) ) & |
---|
445 | + ( r(k+1,j-1,i-1) + r(k+1,j+1,i-1) + & |
---|
446 | r(k+1,j-1,i+1) + r(k+1,j+1,i+1) ) & |
---|
447 | ) |
---|
448 | |
---|
449 | ! f_mg(kc,jc,ic) = 1.0 / 64.0 * ( & |
---|
450 | ! 8.0 * r(k,j,i) & |
---|
451 | ! + 4.0 * ( r(k,j,i-1) + r(k,j,i+1) + & |
---|
452 | ! r(k,j+1,i) + r(k,j-1,i) ) & |
---|
453 | ! + 2.0 * ( r(k,j-1,i-1) + r(k,j+1,i-1) + & |
---|
454 | ! r(k,j-1,i+1) + r(k,j+1,i+1) ) & |
---|
455 | ! + 4.0 * r(k-1,j,i) & |
---|
456 | ! + 2.0 * ( r(k-1,j,i-1) + r(k-1,j,i+1) + & |
---|
457 | ! r(k-1,j+1,i) + r(k-1,j-1,i) ) & |
---|
458 | ! + ( r(k-1,j-1,i-1) + r(k-1,j+1,i-1) + & |
---|
459 | ! r(k-1,j-1,i+1) + r(k-1,j+1,i+1) ) & |
---|
460 | ! + 4.0 * r(k+1,j,i) & |
---|
461 | ! + 2.0 * ( r(k+1,j,i-1) + r(k+1,j,i+1) + & |
---|
462 | ! r(k+1,j+1,i) + r(k+1,j-1,i) ) & |
---|
463 | ! + ( r(k+1,j-1,i-1) + r(k+1,j+1,i-1) + & |
---|
464 | ! r(k+1,j-1,i+1) + r(k+1,j+1,i+1) ) & |
---|
465 | ! ) |
---|
466 | ENDDO |
---|
467 | ENDDO |
---|
468 | ENDDO |
---|
469 | !$OMP END PARALLEL |
---|
470 | |
---|
471 | ! |
---|
472 | !-- Horizontal boundary conditions |
---|
473 | CALL exchange_horiz( f_mg, 1) |
---|
474 | |
---|
475 | IF ( .NOT. bc_lr_cyc ) THEN |
---|
476 | IF (inflow_l .OR. outflow_l) f_mg(:,:,nxl_mg(l)-1) = f_mg(:,:,nxl_mg(l)) |
---|
477 | IF (inflow_r .OR. outflow_r) f_mg(:,:,nxr_mg(l)+1) = f_mg(:,:,nxr_mg(l)) |
---|
478 | ENDIF |
---|
479 | |
---|
480 | IF ( .NOT. bc_ns_cyc ) THEN |
---|
481 | IF (inflow_n .OR. outflow_n) f_mg(:,nyn_mg(l)+1,:) = f_mg(:,nyn_mg(l),:) |
---|
482 | IF (inflow_s .OR. outflow_s) f_mg(:,nys_mg(l)-1,:) = f_mg(:,nys_mg(l),:) |
---|
483 | ENDIF |
---|
484 | |
---|
485 | ! |
---|
486 | !-- Boundary conditions at bottom and top of the domain. |
---|
487 | !-- These points are not handled by the above loop. Points may be within |
---|
488 | !-- buildings, but that doesn't matter. |
---|
489 | IF ( ibc_p_b == 1 ) THEN |
---|
490 | f_mg(nzb,:,: ) = f_mg(nzb+1,:,:) |
---|
491 | ELSE |
---|
492 | f_mg(nzb,:,: ) = 0.0 |
---|
493 | ENDIF |
---|
494 | |
---|
495 | IF ( ibc_p_t == 1 ) THEN |
---|
496 | f_mg(nzt_mg(l)+1,:,: ) = f_mg(nzt_mg(l),:,:) |
---|
497 | ELSE |
---|
498 | f_mg(nzt_mg(l)+1,:,: ) = 0.0 |
---|
499 | ENDIF |
---|
500 | |
---|
501 | |
---|
502 | END SUBROUTINE restrict |
---|
503 | |
---|
504 | |
---|
505 | |
---|
506 | SUBROUTINE prolong( p, temp ) |
---|
507 | |
---|
508 | !------------------------------------------------------------------------------! |
---|
509 | ! Description: |
---|
510 | ! ------------ |
---|
511 | ! Interpolates the correction of the perturbation pressure |
---|
512 | ! to the next finer grid. |
---|
513 | !------------------------------------------------------------------------------! |
---|
514 | |
---|
515 | USE control_parameters |
---|
516 | USE pegrid |
---|
517 | USE indices |
---|
518 | |
---|
519 | IMPLICIT NONE |
---|
520 | |
---|
521 | INTEGER :: i, j, k, l |
---|
522 | |
---|
523 | REAL, DIMENSION(nzb:nzt_mg(grid_level-1)+1, & |
---|
524 | nys_mg(grid_level-1)-1:nyn_mg(grid_level-1)+1, & |
---|
525 | nxl_mg(grid_level-1)-1:nxr_mg(grid_level-1)+1 ) :: p |
---|
526 | |
---|
527 | REAL, DIMENSION(nzb:nzt_mg(grid_level)+1, & |
---|
528 | nys_mg(grid_level)-1:nyn_mg(grid_level)+1, & |
---|
529 | nxl_mg(grid_level)-1:nxr_mg(grid_level)+1) :: temp |
---|
530 | |
---|
531 | |
---|
532 | ! |
---|
533 | !-- First, store elements of the coarser grid on the next finer grid |
---|
534 | l = grid_level |
---|
535 | |
---|
536 | !$OMP PARALLEL PRIVATE (i,j,k) |
---|
537 | !$OMP DO |
---|
538 | DO i = nxl_mg(l-1), nxr_mg(l-1) |
---|
539 | DO j = nys_mg(l-1), nyn_mg(l-1) |
---|
540 | !CDIR NODEP |
---|
541 | DO k = nzb+1, nzt_mg(l-1) |
---|
542 | ! |
---|
543 | !-- Points of the coarse grid are directly stored on the next finer |
---|
544 | !-- grid |
---|
545 | temp(2*k-1,2*j,2*i) = p(k,j,i) |
---|
546 | ! |
---|
547 | !-- Points between two coarse-grid points |
---|
548 | temp(2*k-1,2*j,2*i+1) = 0.5 * ( p(k,j,i) + p(k,j,i+1) ) |
---|
549 | temp(2*k-1,2*j+1,2*i) = 0.5 * ( p(k,j,i) + p(k,j+1,i) ) |
---|
550 | temp(2*k,2*j,2*i) = 0.5 * ( p(k,j,i) + p(k+1,j,i) ) |
---|
551 | ! |
---|
552 | !-- Points in the center of the planes stretched by four points |
---|
553 | !-- of the coarse grid cube |
---|
554 | temp(2*k-1,2*j+1,2*i+1) = 0.25 * ( p(k,j,i) + p(k,j,i+1) + & |
---|
555 | p(k,j+1,i) + p(k,j+1,i+1) ) |
---|
556 | temp(2*k,2*j,2*i+1) = 0.25 * ( p(k,j,i) + p(k,j,i+1) + & |
---|
557 | p(k+1,j,i) + p(k+1,j,i+1) ) |
---|
558 | temp(2*k,2*j+1,2*i) = 0.25 * ( p(k,j,i) + p(k,j+1,i) + & |
---|
559 | p(k+1,j,i) + p(k+1,j+1,i) ) |
---|
560 | ! |
---|
561 | !-- Points in the middle of coarse grid cube |
---|
562 | temp(2*k,2*j+1,2*i+1) = 0.125 * ( p(k,j,i) + p(k,j,i+1) + & |
---|
563 | p(k,j+1,i) + p(k,j+1,i+1) + & |
---|
564 | p(k+1,j,i) + p(k+1,j,i+1) + & |
---|
565 | p(k+1,j+1,i) + p(k+1,j+1,i+1) ) |
---|
566 | ENDDO |
---|
567 | ENDDO |
---|
568 | ENDDO |
---|
569 | !$OMP END PARALLEL |
---|
570 | |
---|
571 | ! |
---|
572 | !-- Horizontal boundary conditions |
---|
573 | CALL exchange_horiz( temp, 1) |
---|
574 | |
---|
575 | IF ( .NOT. bc_lr_cyc ) THEN |
---|
576 | IF (inflow_l .OR. outflow_l) temp(:,:,nxl_mg(l)-1) = temp(:,:,nxl_mg(l)) |
---|
577 | IF (inflow_r .OR. outflow_r) temp(:,:,nxr_mg(l)+1) = temp(:,:,nxr_mg(l)) |
---|
578 | ENDIF |
---|
579 | |
---|
580 | IF ( .NOT. bc_ns_cyc ) THEN |
---|
581 | IF (inflow_n .OR. outflow_n) temp(:,nyn_mg(l)+1,:) = temp(:,nyn_mg(l),:) |
---|
582 | IF (inflow_s .OR. outflow_s) temp(:,nys_mg(l)-1,:) = temp(:,nys_mg(l),:) |
---|
583 | ENDIF |
---|
584 | |
---|
585 | ! |
---|
586 | !-- Bottom and top boundary conditions |
---|
587 | IF ( ibc_p_b == 1 ) THEN |
---|
588 | temp(nzb,:,: ) = temp(nzb+1,:,:) |
---|
589 | ELSE |
---|
590 | temp(nzb,:,: ) = 0.0 |
---|
591 | ENDIF |
---|
592 | |
---|
593 | IF ( ibc_p_t == 1 ) THEN |
---|
594 | temp(nzt_mg(l)+1,:,: ) = temp(nzt_mg(l),:,:) |
---|
595 | ELSE |
---|
596 | temp(nzt_mg(l)+1,:,: ) = 0.0 |
---|
597 | ENDIF |
---|
598 | |
---|
599 | |
---|
600 | END SUBROUTINE prolong |
---|
601 | |
---|
602 | |
---|
603 | SUBROUTINE redblack( f_mg, p_mg ) |
---|
604 | |
---|
605 | !------------------------------------------------------------------------------! |
---|
606 | ! Description: |
---|
607 | ! ------------ |
---|
608 | ! Relaxation method for the multigrid scheme. A Gauss-Seidel iteration with |
---|
609 | ! 3D-Red-Black decomposition (GS-RB) is used. |
---|
610 | !------------------------------------------------------------------------------! |
---|
611 | |
---|
612 | USE arrays_3d |
---|
613 | USE control_parameters |
---|
614 | USE cpulog |
---|
615 | USE grid_variables |
---|
616 | USE indices |
---|
617 | USE pegrid |
---|
618 | |
---|
619 | IMPLICIT NONE |
---|
620 | |
---|
621 | INTEGER :: colour, i, ic, j, jc, jj, k, l, n |
---|
622 | |
---|
623 | LOGICAL :: unroll |
---|
624 | |
---|
625 | REAL :: wall_left, wall_north, wall_right, wall_south, wall_total, wall_top |
---|
626 | |
---|
627 | REAL, DIMENSION(nzb:nzt_mg(grid_level)+1, & |
---|
628 | nys_mg(grid_level)-1:nyn_mg(grid_level)+1, & |
---|
629 | nxl_mg(grid_level)-1:nxr_mg(grid_level)+1) :: f_mg, p_mg |
---|
630 | |
---|
631 | l = grid_level |
---|
632 | |
---|
633 | ! |
---|
634 | !-- Choose flag array of this level |
---|
635 | SELECT CASE ( l ) |
---|
636 | CASE ( 1 ) |
---|
637 | flags => wall_flags_1 |
---|
638 | CASE ( 2 ) |
---|
639 | flags => wall_flags_2 |
---|
640 | CASE ( 3 ) |
---|
641 | flags => wall_flags_3 |
---|
642 | CASE ( 4 ) |
---|
643 | flags => wall_flags_4 |
---|
644 | CASE ( 5 ) |
---|
645 | flags => wall_flags_5 |
---|
646 | CASE ( 6 ) |
---|
647 | flags => wall_flags_6 |
---|
648 | CASE ( 7 ) |
---|
649 | flags => wall_flags_7 |
---|
650 | CASE ( 8 ) |
---|
651 | flags => wall_flags_8 |
---|
652 | CASE ( 9 ) |
---|
653 | flags => wall_flags_9 |
---|
654 | CASE ( 10 ) |
---|
655 | flags => wall_flags_10 |
---|
656 | END SELECT |
---|
657 | |
---|
658 | unroll = ( MOD( nyn_mg(l)-nys_mg(l)+1, 4 ) == 0 .AND. & |
---|
659 | MOD( nxr_mg(l)-nxl_mg(l)+1, 2 ) == 0 ) |
---|
660 | |
---|
661 | DO n = 1, ngsrb |
---|
662 | |
---|
663 | DO colour = 1, 2 |
---|
664 | |
---|
665 | IF ( .NOT. unroll ) THEN |
---|
666 | |
---|
667 | CALL cpu_log( log_point_s(36), 'redblack_no_unroll', 'start' ) |
---|
668 | |
---|
669 | ! |
---|
670 | !-- Without unrolling of loops, no cache optimization |
---|
671 | DO i = nxl_mg(l), nxr_mg(l), 2 |
---|
672 | DO j = nys_mg(l) + 2 - colour, nyn_mg(l), 2 |
---|
673 | DO k = nzb+1, nzt_mg(l), 2 |
---|
674 | ! p_mg(k,j,i) = 1.0 / f1_mg(k,l) * ( & |
---|
675 | ! ddx2_mg(l) * ( p_mg(k,j,i+1) + p_mg(k,j,i-1) ) & |
---|
676 | ! + ddy2_mg(l) * ( p_mg(k,j+1,i) + p_mg(k,j-1,i) ) & |
---|
677 | ! + f2_mg(k,l) * p_mg(k+1,j,i) & |
---|
678 | ! + f3_mg(k,l) * p_mg(k-1,j,i) - f_mg(k,j,i) & |
---|
679 | ! ) |
---|
680 | |
---|
681 | p_mg(k,j,i) = 1.0 / f1_mg(k,l) * ( & |
---|
682 | ddx2_mg(l) * & |
---|
683 | ( p_mg(k,j,i+1) + IBITS( flags(k,j,i), 5, 1 ) * & |
---|
684 | ( p_mg(k,j,i) - p_mg(k,j,i+1) ) + & |
---|
685 | p_mg(k,j,i-1) + IBITS( flags(k,j,i), 4, 1 ) * & |
---|
686 | ( p_mg(k,j,i) - p_mg(k,j,i-1) ) ) & |
---|
687 | + ddy2_mg(l) * & |
---|
688 | ( p_mg(k,j+1,i) + IBITS( flags(k,j,i), 3, 1 ) * & |
---|
689 | ( p_mg(k,j,i) - p_mg(k,j+1,i) ) + & |
---|
690 | p_mg(k,j-1,i) + IBITS( flags(k,j,i), 2, 1 ) * & |
---|
691 | ( p_mg(k,j,i) - p_mg(k,j-1,i) ) ) & |
---|
692 | + f2_mg(k,l) * p_mg(k+1,j,i) & |
---|
693 | + f3_mg(k,l) * & |
---|
694 | ( p_mg(k-1,j,i) + IBITS( flags(k,j,i), 0, 1 ) * & |
---|
695 | ( p_mg(k,j,i) - p_mg(k-1,j,i) ) ) & |
---|
696 | - f_mg(k,j,i) ) |
---|
697 | ENDDO |
---|
698 | ENDDO |
---|
699 | ENDDO |
---|
700 | |
---|
701 | DO i = nxl_mg(l)+1, nxr_mg(l), 2 |
---|
702 | DO j = nys_mg(l) + (colour-1), nyn_mg(l), 2 |
---|
703 | DO k = nzb+1, nzt_mg(l), 2 |
---|
704 | p_mg(k,j,i) = 1.0 / f1_mg(k,l) * ( & |
---|
705 | ddx2_mg(l) * & |
---|
706 | ( p_mg(k,j,i+1) + IBITS( flags(k,j,i), 5, 1 ) * & |
---|
707 | ( p_mg(k,j,i) - p_mg(k,j,i+1) ) + & |
---|
708 | p_mg(k,j,i-1) + IBITS( flags(k,j,i), 4, 1 ) * & |
---|
709 | ( p_mg(k,j,i) - p_mg(k,j,i-1) ) ) & |
---|
710 | + ddy2_mg(l) * & |
---|
711 | ( p_mg(k,j+1,i) + IBITS( flags(k,j,i), 3, 1 ) * & |
---|
712 | ( p_mg(k,j,i) - p_mg(k,j+1,i) ) + & |
---|
713 | p_mg(k,j-1,i) + IBITS( flags(k,j,i), 2, 1 ) * & |
---|
714 | ( p_mg(k,j,i) - p_mg(k,j-1,i) ) ) & |
---|
715 | + f2_mg(k,l) * p_mg(k+1,j,i) & |
---|
716 | + f3_mg(k,l) * & |
---|
717 | ( p_mg(k-1,j,i) + IBITS( flags(k,j,i), 0, 1 ) * & |
---|
718 | ( p_mg(k,j,i) - p_mg(k-1,j,i) ) ) & |
---|
719 | - f_mg(k,j,i) ) |
---|
720 | ENDDO |
---|
721 | ENDDO |
---|
722 | ENDDO |
---|
723 | |
---|
724 | DO i = nxl_mg(l), nxr_mg(l), 2 |
---|
725 | DO j = nys_mg(l) + (colour-1), nyn_mg(l), 2 |
---|
726 | DO k = nzb+2, nzt_mg(l), 2 |
---|
727 | p_mg(k,j,i) = 1.0 / f1_mg(k,l) * ( & |
---|
728 | ddx2_mg(l) * & |
---|
729 | ( p_mg(k,j,i+1) + IBITS( flags(k,j,i), 5, 1 ) * & |
---|
730 | ( p_mg(k,j,i) - p_mg(k,j,i+1) ) + & |
---|
731 | p_mg(k,j,i-1) + IBITS( flags(k,j,i), 4, 1 ) * & |
---|
732 | ( p_mg(k,j,i) - p_mg(k,j,i-1) ) ) & |
---|
733 | + ddy2_mg(l) * & |
---|
734 | ( p_mg(k,j+1,i) + IBITS( flags(k,j,i), 3, 1 ) * & |
---|
735 | ( p_mg(k,j,i) - p_mg(k,j+1,i) ) + & |
---|
736 | p_mg(k,j-1,i) + IBITS( flags(k,j,i), 2, 1 ) * & |
---|
737 | ( p_mg(k,j,i) - p_mg(k,j-1,i) ) ) & |
---|
738 | + f2_mg(k,l) * p_mg(k+1,j,i) & |
---|
739 | + f3_mg(k,l) * & |
---|
740 | ( p_mg(k-1,j,i) + IBITS( flags(k,j,i), 0, 1 ) * & |
---|
741 | ( p_mg(k,j,i) - p_mg(k-1,j,i) ) ) & |
---|
742 | - f_mg(k,j,i) ) |
---|
743 | ENDDO |
---|
744 | ENDDO |
---|
745 | ENDDO |
---|
746 | |
---|
747 | DO i = nxl_mg(l)+1, nxr_mg(l), 2 |
---|
748 | DO j = nys_mg(l) + 2 - colour, nyn_mg(l), 2 |
---|
749 | DO k = nzb+2, nzt_mg(l), 2 |
---|
750 | p_mg(k,j,i) = 1.0 / f1_mg(k,l) * ( & |
---|
751 | ddx2_mg(l) * & |
---|
752 | ( p_mg(k,j,i+1) + IBITS( flags(k,j,i), 5, 1 ) * & |
---|
753 | ( p_mg(k,j,i) - p_mg(k,j,i+1) ) + & |
---|
754 | p_mg(k,j,i-1) + IBITS( flags(k,j,i), 4, 1 ) * & |
---|
755 | ( p_mg(k,j,i) - p_mg(k,j,i-1) ) ) & |
---|
756 | + ddy2_mg(l) * & |
---|
757 | ( p_mg(k,j+1,i) + IBITS( flags(k,j,i), 3, 1 ) * & |
---|
758 | ( p_mg(k,j,i) - p_mg(k,j+1,i) ) + & |
---|
759 | p_mg(k,j-1,i) + IBITS( flags(k,j,i), 2, 1 ) * & |
---|
760 | ( p_mg(k,j,i) - p_mg(k,j-1,i) ) ) & |
---|
761 | + f2_mg(k,l) * p_mg(k+1,j,i) & |
---|
762 | + f3_mg(k,l) * & |
---|
763 | ( p_mg(k-1,j,i) + IBITS( flags(k,j,i), 0, 1 ) * & |
---|
764 | ( p_mg(k,j,i) - p_mg(k-1,j,i) ) ) & |
---|
765 | - f_mg(k,j,i) ) |
---|
766 | ENDDO |
---|
767 | ENDDO |
---|
768 | ENDDO |
---|
769 | CALL cpu_log( log_point_s(36), 'redblack_no_unroll', 'stop' ) |
---|
770 | |
---|
771 | ELSE |
---|
772 | |
---|
773 | ! |
---|
774 | !-- Loop unrolling along y, only one i loop for better cache use |
---|
775 | CALL cpu_log( log_point_s(38), 'redblack_unroll', 'start' ) |
---|
776 | DO ic = nxl_mg(l), nxr_mg(l), 2 |
---|
777 | DO jc = nys_mg(l), nyn_mg(l), 4 |
---|
778 | i = ic |
---|
779 | jj = jc+2-colour |
---|
780 | DO k = nzb+1, nzt_mg(l), 2 |
---|
781 | j = jj |
---|
782 | p_mg(k,j,i) = 1.0 / f1_mg(k,l) * ( & |
---|
783 | ddx2_mg(l) * & |
---|
784 | ( p_mg(k,j,i+1) + IBITS( flags(k,j,i), 5, 1 ) * & |
---|
785 | ( p_mg(k,j,i) - p_mg(k,j,i+1) ) + & |
---|
786 | p_mg(k,j,i-1) + IBITS( flags(k,j,i), 4, 1 ) * & |
---|
787 | ( p_mg(k,j,i) - p_mg(k,j,i-1) ) ) & |
---|
788 | + ddy2_mg(l) * & |
---|
789 | ( p_mg(k,j+1,i) + IBITS( flags(k,j,i), 3, 1 ) * & |
---|
790 | ( p_mg(k,j,i) - p_mg(k,j+1,i) ) + & |
---|
791 | p_mg(k,j-1,i) + IBITS( flags(k,j,i), 2, 1 ) * & |
---|
792 | ( p_mg(k,j,i) - p_mg(k,j-1,i) ) ) & |
---|
793 | + f2_mg(k,l) * p_mg(k+1,j,i) & |
---|
794 | + f3_mg(k,l) * & |
---|
795 | ( p_mg(k-1,j,i) + IBITS( flags(k,j,i), 0, 1 ) * & |
---|
796 | ( p_mg(k,j,i) - p_mg(k-1,j,i) ) ) & |
---|
797 | - f_mg(k,j,i) ) |
---|
798 | j = jj+2 |
---|
799 | p_mg(k,j,i) = 1.0 / f1_mg(k,l) * ( & |
---|
800 | ddx2_mg(l) * & |
---|
801 | ( p_mg(k,j,i+1) + IBITS( flags(k,j,i), 5, 1 ) * & |
---|
802 | ( p_mg(k,j,i) - p_mg(k,j,i+1) ) + & |
---|
803 | p_mg(k,j,i-1) + IBITS( flags(k,j,i), 4, 1 ) * & |
---|
804 | ( p_mg(k,j,i) - p_mg(k,j,i-1) ) ) & |
---|
805 | + ddy2_mg(l) * & |
---|
806 | ( p_mg(k,j+1,i) + IBITS( flags(k,j,i), 3, 1 ) * & |
---|
807 | ( p_mg(k,j,i) - p_mg(k,j+1,i) ) + & |
---|
808 | p_mg(k,j-1,i) + IBITS( flags(k,j,i), 2, 1 ) * & |
---|
809 | ( p_mg(k,j,i) - p_mg(k,j-1,i) ) ) & |
---|
810 | + f2_mg(k,l) * p_mg(k+1,j,i) & |
---|
811 | + f3_mg(k,l) * & |
---|
812 | ( p_mg(k-1,j,i) + IBITS( flags(k,j,i), 0, 1 ) * & |
---|
813 | ( p_mg(k,j,i) - p_mg(k-1,j,i) ) ) & |
---|
814 | - f_mg(k,j,i) ) |
---|
815 | ENDDO |
---|
816 | |
---|
817 | i = ic+1 |
---|
818 | jj = jc+colour-1 |
---|
819 | DO k = nzb+1, nzt_mg(l), 2 |
---|
820 | j =jj |
---|
821 | p_mg(k,j,i) = 1.0 / f1_mg(k,l) * ( & |
---|
822 | ddx2_mg(l) * & |
---|
823 | ( p_mg(k,j,i+1) + IBITS( flags(k,j,i), 5, 1 ) * & |
---|
824 | ( p_mg(k,j,i) - p_mg(k,j,i+1) ) + & |
---|
825 | p_mg(k,j,i-1) + IBITS( flags(k,j,i), 4, 1 ) * & |
---|
826 | ( p_mg(k,j,i) - p_mg(k,j,i-1) ) ) & |
---|
827 | + ddy2_mg(l) * & |
---|
828 | ( p_mg(k,j+1,i) + IBITS( flags(k,j,i), 3, 1 ) * & |
---|
829 | ( p_mg(k,j,i) - p_mg(k,j+1,i) ) + & |
---|
830 | p_mg(k,j-1,i) + IBITS( flags(k,j,i), 2, 1 ) * & |
---|
831 | ( p_mg(k,j,i) - p_mg(k,j-1,i) ) ) & |
---|
832 | + f2_mg(k,l) * p_mg(k+1,j,i) & |
---|
833 | + f3_mg(k,l) * & |
---|
834 | ( p_mg(k-1,j,i) + IBITS( flags(k,j,i), 0, 1 ) * & |
---|
835 | ( p_mg(k,j,i) - p_mg(k-1,j,i) ) ) & |
---|
836 | - f_mg(k,j,i) ) |
---|
837 | j = jj+2 |
---|
838 | p_mg(k,j,i) = 1.0 / f1_mg(k,l) * ( & |
---|
839 | ddx2_mg(l) * & |
---|
840 | ( p_mg(k,j,i+1) + IBITS( flags(k,j,i), 5, 1 ) * & |
---|
841 | ( p_mg(k,j,i) - p_mg(k,j,i+1) ) + & |
---|
842 | p_mg(k,j,i-1) + IBITS( flags(k,j,i), 4, 1 ) * & |
---|
843 | ( p_mg(k,j,i) - p_mg(k,j,i-1) ) ) & |
---|
844 | + ddy2_mg(l) * & |
---|
845 | ( p_mg(k,j+1,i) + IBITS( flags(k,j,i), 3, 1 ) * & |
---|
846 | ( p_mg(k,j,i) - p_mg(k,j+1,i) ) + & |
---|
847 | p_mg(k,j-1,i) + IBITS( flags(k,j,i), 2, 1 ) * & |
---|
848 | ( p_mg(k,j,i) - p_mg(k,j-1,i) ) ) & |
---|
849 | + f2_mg(k,l) * p_mg(k+1,j,i) & |
---|
850 | + f3_mg(k,l) * & |
---|
851 | ( p_mg(k-1,j,i) + IBITS( flags(k,j,i), 0, 1 ) * & |
---|
852 | ( p_mg(k,j,i) - p_mg(k-1,j,i) ) ) & |
---|
853 | - f_mg(k,j,i) ) |
---|
854 | ENDDO |
---|
855 | |
---|
856 | i = ic |
---|
857 | jj = jc+colour-1 |
---|
858 | DO k = nzb+2, nzt_mg(l), 2 |
---|
859 | j =jj |
---|
860 | p_mg(k,j,i) = 1.0 / f1_mg(k,l) * ( & |
---|
861 | ddx2_mg(l) * & |
---|
862 | ( p_mg(k,j,i+1) + IBITS( flags(k,j,i), 5, 1 ) * & |
---|
863 | ( p_mg(k,j,i) - p_mg(k,j,i+1) ) + & |
---|
864 | p_mg(k,j,i-1) + IBITS( flags(k,j,i), 4, 1 ) * & |
---|
865 | ( p_mg(k,j,i) - p_mg(k,j,i-1) ) ) & |
---|
866 | + ddy2_mg(l) * & |
---|
867 | ( p_mg(k,j+1,i) + IBITS( flags(k,j,i), 3, 1 ) * & |
---|
868 | ( p_mg(k,j,i) - p_mg(k,j+1,i) ) + & |
---|
869 | p_mg(k,j-1,i) + IBITS( flags(k,j,i), 2, 1 ) * & |
---|
870 | ( p_mg(k,j,i) - p_mg(k,j-1,i) ) ) & |
---|
871 | + f2_mg(k,l) * p_mg(k+1,j,i) & |
---|
872 | + f3_mg(k,l) * & |
---|
873 | ( p_mg(k-1,j,i) + IBITS( flags(k,j,i), 0, 1 ) * & |
---|
874 | ( p_mg(k,j,i) - p_mg(k-1,j,i) ) ) & |
---|
875 | - f_mg(k,j,i) ) |
---|
876 | j = jj+2 |
---|
877 | p_mg(k,j,i) = 1.0 / f1_mg(k,l) * ( & |
---|
878 | ddx2_mg(l) * & |
---|
879 | ( p_mg(k,j,i+1) + IBITS( flags(k,j,i), 5, 1 ) * & |
---|
880 | ( p_mg(k,j,i) - p_mg(k,j,i+1) ) + & |
---|
881 | p_mg(k,j,i-1) + IBITS( flags(k,j,i), 4, 1 ) * & |
---|
882 | ( p_mg(k,j,i) - p_mg(k,j,i-1) ) ) & |
---|
883 | + ddy2_mg(l) * & |
---|
884 | ( p_mg(k,j+1,i) + IBITS( flags(k,j,i), 3, 1 ) * & |
---|
885 | ( p_mg(k,j,i) - p_mg(k,j+1,i) ) + & |
---|
886 | p_mg(k,j-1,i) + IBITS( flags(k,j,i), 2, 1 ) * & |
---|
887 | ( p_mg(k,j,i) - p_mg(k,j-1,i) ) ) & |
---|
888 | + f2_mg(k,l) * p_mg(k+1,j,i) & |
---|
889 | + f3_mg(k,l) * & |
---|
890 | ( p_mg(k-1,j,i) + IBITS( flags(k,j,i), 0, 1 ) * & |
---|
891 | ( p_mg(k,j,i) - p_mg(k-1,j,i) ) ) & |
---|
892 | - f_mg(k,j,i) ) |
---|
893 | ENDDO |
---|
894 | |
---|
895 | i = ic+1 |
---|
896 | jj = jc+2-colour |
---|
897 | DO k = nzb+2, nzt_mg(l), 2 |
---|
898 | j =jj |
---|
899 | p_mg(k,j,i) = 1.0 / f1_mg(k,l) * ( & |
---|
900 | ddx2_mg(l) * & |
---|
901 | ( p_mg(k,j,i+1) + IBITS( flags(k,j,i), 5, 1 ) * & |
---|
902 | ( p_mg(k,j,i) - p_mg(k,j,i+1) ) + & |
---|
903 | p_mg(k,j,i-1) + IBITS( flags(k,j,i), 4, 1 ) * & |
---|
904 | ( p_mg(k,j,i) - p_mg(k,j,i-1) ) ) & |
---|
905 | + ddy2_mg(l) * & |
---|
906 | ( p_mg(k,j+1,i) + IBITS( flags(k,j,i), 3, 1 ) * & |
---|
907 | ( p_mg(k,j,i) - p_mg(k,j+1,i) ) + & |
---|
908 | p_mg(k,j-1,i) + IBITS( flags(k,j,i), 2, 1 ) * & |
---|
909 | ( p_mg(k,j,i) - p_mg(k,j-1,i) ) ) & |
---|
910 | + f2_mg(k,l) * p_mg(k+1,j,i) & |
---|
911 | + f3_mg(k,l) * & |
---|
912 | ( p_mg(k-1,j,i) + IBITS( flags(k,j,i), 0, 1 ) * & |
---|
913 | ( p_mg(k,j,i) - p_mg(k-1,j,i) ) ) & |
---|
914 | - f_mg(k,j,i) ) |
---|
915 | j = jj+2 |
---|
916 | p_mg(k,j,i) = 1.0 / f1_mg(k,l) * ( & |
---|
917 | ddx2_mg(l) * & |
---|
918 | ( p_mg(k,j,i+1) + IBITS( flags(k,j,i), 5, 1 ) * & |
---|
919 | ( p_mg(k,j,i) - p_mg(k,j,i+1) ) + & |
---|
920 | p_mg(k,j,i-1) + IBITS( flags(k,j,i), 4, 1 ) * & |
---|
921 | ( p_mg(k,j,i) - p_mg(k,j,i-1) ) ) & |
---|
922 | + ddy2_mg(l) * & |
---|
923 | ( p_mg(k,j+1,i) + IBITS( flags(k,j,i), 3, 1 ) * & |
---|
924 | ( p_mg(k,j,i) - p_mg(k,j+1,i) ) + & |
---|
925 | p_mg(k,j-1,i) + IBITS( flags(k,j,i), 2, 1 ) * & |
---|
926 | ( p_mg(k,j,i) - p_mg(k,j-1,i) ) ) & |
---|
927 | + f2_mg(k,l) * p_mg(k+1,j,i) & |
---|
928 | + f3_mg(k,l) * & |
---|
929 | ( p_mg(k-1,j,i) + IBITS( flags(k,j,i), 0, 1 ) * & |
---|
930 | ( p_mg(k,j,i) - p_mg(k-1,j,i) ) ) & |
---|
931 | - f_mg(k,j,i) ) |
---|
932 | ENDDO |
---|
933 | |
---|
934 | ENDDO |
---|
935 | ENDDO |
---|
936 | CALL cpu_log( log_point_s(38), 'redblack_unroll', 'stop' ) |
---|
937 | |
---|
938 | ENDIF |
---|
939 | |
---|
940 | ! |
---|
941 | !-- Horizontal boundary conditions |
---|
942 | CALL exchange_horiz( p_mg, 1 ) |
---|
943 | |
---|
944 | IF ( .NOT. bc_lr_cyc ) THEN |
---|
945 | IF ( inflow_l .OR. outflow_l ) THEN |
---|
946 | p_mg(:,:,nxl_mg(l)-1) = p_mg(:,:,nxl_mg(l)) |
---|
947 | ENDIF |
---|
948 | IF ( inflow_r .OR. outflow_r ) THEN |
---|
949 | p_mg(:,:,nxr_mg(l)+1) = p_mg(:,:,nxr_mg(l)) |
---|
950 | ENDIF |
---|
951 | ENDIF |
---|
952 | |
---|
953 | IF ( .NOT. bc_ns_cyc ) THEN |
---|
954 | IF ( inflow_n .OR. outflow_n ) THEN |
---|
955 | p_mg(:,nyn_mg(l)+1,:) = p_mg(:,nyn_mg(l),:) |
---|
956 | ENDIF |
---|
957 | IF ( inflow_s .OR. outflow_s ) THEN |
---|
958 | p_mg(:,nys_mg(l)-1,:) = p_mg(:,nys_mg(l),:) |
---|
959 | ENDIF |
---|
960 | ENDIF |
---|
961 | |
---|
962 | ! |
---|
963 | !-- Bottom and top boundary conditions |
---|
964 | IF ( ibc_p_b == 1 ) THEN |
---|
965 | p_mg(nzb,:,: ) = p_mg(nzb+1,:,:) |
---|
966 | ELSE |
---|
967 | p_mg(nzb,:,: ) = 0.0 |
---|
968 | ENDIF |
---|
969 | |
---|
970 | IF ( ibc_p_t == 1 ) THEN |
---|
971 | p_mg(nzt_mg(l)+1,:,: ) = p_mg(nzt_mg(l),:,:) |
---|
972 | ELSE |
---|
973 | p_mg(nzt_mg(l)+1,:,: ) = 0.0 |
---|
974 | ENDIF |
---|
975 | |
---|
976 | ENDDO |
---|
977 | |
---|
978 | ENDDO |
---|
979 | |
---|
980 | ! |
---|
981 | !-- Set pressure within topography and at the topography surfaces |
---|
982 | !$OMP PARALLEL PRIVATE (i,j,k,wall_left,wall_north,wall_right,wall_south,wall_top,wall_total) |
---|
983 | !$OMP DO |
---|
984 | DO i = nxl_mg(l), nxr_mg(l) |
---|
985 | DO j = nys_mg(l), nyn_mg(l) |
---|
986 | DO k = nzb, nzt_mg(l) |
---|
987 | ! |
---|
988 | !-- First, set pressure inside topography to zero |
---|
989 | p_mg(k,j,i) = p_mg(k,j,i) * ( 1.0 - IBITS( flags(k,j,i), 6, 1 ) ) |
---|
990 | ! |
---|
991 | !-- Second, determine if the gridpoint inside topography is adjacent |
---|
992 | !-- to a wall and set its value to a value given by the average of |
---|
993 | !-- those values obtained from Neumann boundary condition |
---|
994 | wall_left = IBITS( flags(k,j,i-1), 5, 1 ) |
---|
995 | wall_right = IBITS( flags(k,j,i+1), 4, 1 ) |
---|
996 | wall_south = IBITS( flags(k,j-1,i), 3, 1 ) |
---|
997 | wall_north = IBITS( flags(k,j+1,i), 2, 1 ) |
---|
998 | wall_top = IBITS( flags(k+1,j,i), 0, 1 ) |
---|
999 | wall_total = wall_left + wall_right + wall_south + wall_north + & |
---|
1000 | wall_top |
---|
1001 | |
---|
1002 | IF ( wall_total > 0.0 ) THEN |
---|
1003 | p_mg(k,j,i) = 1.0 / wall_total * & |
---|
1004 | ( wall_left * p_mg(k,j,i-1) + & |
---|
1005 | wall_right * p_mg(k,j,i+1) + & |
---|
1006 | wall_south * p_mg(k,j-1,i) + & |
---|
1007 | wall_north * p_mg(k,j+1,i) + & |
---|
1008 | wall_top * p_mg(k+1,j,i) ) |
---|
1009 | ENDIF |
---|
1010 | ENDDO |
---|
1011 | ENDDO |
---|
1012 | ENDDO |
---|
1013 | !$OMP END PARALLEL |
---|
1014 | |
---|
1015 | ! |
---|
1016 | !-- One more time horizontal boundary conditions |
---|
1017 | CALL exchange_horiz( p_mg, 1) |
---|
1018 | |
---|
1019 | |
---|
1020 | END SUBROUTINE redblack |
---|
1021 | |
---|
1022 | |
---|
1023 | |
---|
1024 | SUBROUTINE mg_gather( f2, f2_sub ) |
---|
1025 | |
---|
1026 | USE control_parameters |
---|
1027 | USE cpulog |
---|
1028 | USE indices |
---|
1029 | USE pegrid |
---|
1030 | |
---|
1031 | IMPLICIT NONE |
---|
1032 | |
---|
1033 | INTEGER :: i, il, ir, j, jn, js, k, nwords |
---|
1034 | |
---|
1035 | REAL, DIMENSION(nzb:nzt_mg(grid_level)+1, & |
---|
1036 | nys_mg(grid_level)-1:nyn_mg(grid_level)+1, & |
---|
1037 | nxl_mg(grid_level)-1:nxr_mg(grid_level)+1) :: f2, f2_l |
---|
1038 | |
---|
1039 | REAL, DIMENSION(nzb:mg_loc_ind(5,myid)+1, & |
---|
1040 | mg_loc_ind(3,myid)-1:mg_loc_ind(4,myid)+1, & |
---|
1041 | mg_loc_ind(1,myid)-1:mg_loc_ind(2,myid)+1) :: f2_sub |
---|
1042 | |
---|
1043 | |
---|
1044 | #if defined( __parallel ) |
---|
1045 | CALL cpu_log( log_point_s(34), 'mg_gather', 'start' ) |
---|
1046 | |
---|
1047 | f2_l = 0.0 |
---|
1048 | |
---|
1049 | ! |
---|
1050 | !-- Store the local subdomain array on the total array |
---|
1051 | js = mg_loc_ind(3,myid) |
---|
1052 | IF ( south_border_pe ) js = js - 1 |
---|
1053 | jn = mg_loc_ind(4,myid) |
---|
1054 | IF ( north_border_pe ) jn = jn + 1 |
---|
1055 | il = mg_loc_ind(1,myid) |
---|
1056 | IF ( left_border_pe ) il = il - 1 |
---|
1057 | ir = mg_loc_ind(2,myid) |
---|
1058 | IF ( right_border_pe ) ir = ir + 1 |
---|
1059 | DO i = il, ir |
---|
1060 | DO j = js, jn |
---|
1061 | DO k = nzb, nzt_mg(grid_level)+1 |
---|
1062 | f2_l(k,j,i) = f2_sub(k,j,i) |
---|
1063 | ENDDO |
---|
1064 | ENDDO |
---|
1065 | ENDDO |
---|
1066 | |
---|
1067 | ! |
---|
1068 | !-- Find out the number of array elements of the total array |
---|
1069 | nwords = SIZE( f2 ) |
---|
1070 | |
---|
1071 | ! |
---|
1072 | !-- Gather subdomain data from all PEs |
---|
1073 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
---|
1074 | CALL MPI_ALLREDUCE( f2_l(nzb,nys_mg(grid_level)-1,nxl_mg(grid_level)-1), & |
---|
1075 | f2(nzb,nys_mg(grid_level)-1,nxl_mg(grid_level)-1), & |
---|
1076 | nwords, MPI_REAL, MPI_SUM, comm2d, ierr ) |
---|
1077 | |
---|
1078 | CALL cpu_log( log_point_s(34), 'mg_gather', 'stop' ) |
---|
1079 | #endif |
---|
1080 | |
---|
1081 | END SUBROUTINE mg_gather |
---|
1082 | |
---|
1083 | |
---|
1084 | |
---|
1085 | SUBROUTINE mg_scatter( p2, p2_sub ) |
---|
1086 | ! |
---|
1087 | !-- TODO: It may be possible to improve the speed of this routine by using |
---|
1088 | !-- non-blocking communication |
---|
1089 | |
---|
1090 | USE control_parameters |
---|
1091 | USE cpulog |
---|
1092 | USE indices |
---|
1093 | USE pegrid |
---|
1094 | |
---|
1095 | IMPLICIT NONE |
---|
1096 | |
---|
1097 | INTEGER :: nwords |
---|
1098 | |
---|
1099 | REAL, DIMENSION(nzb:nzt_mg(grid_level-1)+1, & |
---|
1100 | nys_mg(grid_level-1)-1:nyn_mg(grid_level-1)+1, & |
---|
1101 | nxl_mg(grid_level-1)-1:nxr_mg(grid_level-1)+1) :: p2 |
---|
1102 | |
---|
1103 | REAL, DIMENSION(nzb:mg_loc_ind(5,myid)+1, & |
---|
1104 | mg_loc_ind(3,myid)-1:mg_loc_ind(4,myid)+1, & |
---|
1105 | mg_loc_ind(1,myid)-1:mg_loc_ind(2,myid)+1) :: p2_sub |
---|
1106 | |
---|
1107 | ! |
---|
1108 | !-- Find out the number of array elements of the subdomain array |
---|
1109 | nwords = SIZE( p2_sub ) |
---|
1110 | |
---|
1111 | #if defined( __parallel ) |
---|
1112 | CALL cpu_log( log_point_s(35), 'mg_scatter', 'start' ) |
---|
1113 | |
---|
1114 | p2_sub = p2(:,mg_loc_ind(3,myid)-1:mg_loc_ind(4,myid)+1, & |
---|
1115 | mg_loc_ind(1,myid)-1:mg_loc_ind(2,myid)+1) |
---|
1116 | |
---|
1117 | CALL cpu_log( log_point_s(35), 'mg_scatter', 'stop' ) |
---|
1118 | #endif |
---|
1119 | |
---|
1120 | END SUBROUTINE mg_scatter |
---|
1121 | |
---|
1122 | |
---|
1123 | |
---|
1124 | RECURSIVE SUBROUTINE next_mg_level( f_mg, p_mg, p3, r ) |
---|
1125 | |
---|
1126 | !------------------------------------------------------------------------------! |
---|
1127 | ! Description: |
---|
1128 | ! ------------ |
---|
1129 | ! This is where the multigrid technique takes place. V- and W- Cycle are |
---|
1130 | ! implemented and steered by the parameter "gamma". Parameter "nue" determines |
---|
1131 | ! the convergence of the multigrid iterative solution. There are nue times |
---|
1132 | ! RB-GS iterations. It should be set to "1" or "2", considering the time effort |
---|
1133 | ! one would like to invest. Last choice shows a very good converging factor, |
---|
1134 | ! but leads to an increase in computing time. |
---|
1135 | !------------------------------------------------------------------------------! |
---|
1136 | |
---|
1137 | USE arrays_3d |
---|
1138 | USE control_parameters |
---|
1139 | USE grid_variables |
---|
1140 | USE indices |
---|
1141 | USE pegrid |
---|
1142 | |
---|
1143 | IMPLICIT NONE |
---|
1144 | |
---|
1145 | INTEGER :: i, j, k, nxl_mg_save, nxr_mg_save, nyn_mg_save, nys_mg_save, & |
---|
1146 | nzt_mg_save |
---|
1147 | |
---|
1148 | REAL, DIMENSION(nzb:nzt_mg(grid_level)+1, & |
---|
1149 | nys_mg(grid_level)-1:nyn_mg(grid_level)+1, & |
---|
1150 | nxl_mg(grid_level)-1:nxr_mg(grid_level)+1) :: f_mg, p_mg, p3, r |
---|
1151 | |
---|
1152 | REAL, DIMENSION(nzb:nzt_mg(grid_level-1)+1, & |
---|
1153 | nys_mg(grid_level-1)-1:nyn_mg(grid_level-1)+1, & |
---|
1154 | nxl_mg(grid_level-1)-1:nxr_mg(grid_level-1)+1) :: f2, p2 |
---|
1155 | |
---|
1156 | REAL, DIMENSION(:,:,:), ALLOCATABLE :: f2_sub, p2_sub |
---|
1157 | |
---|
1158 | ! |
---|
1159 | !-- Restriction to the coarsest grid |
---|
1160 | 10 IF ( grid_level == 1 ) THEN |
---|
1161 | |
---|
1162 | ! |
---|
1163 | !-- Solution on the coarsest grid. Double the number of Gauss-Seidel |
---|
1164 | !-- iterations in order to get a more accurate solution. |
---|
1165 | ngsrb = 2 * ngsrb |
---|
1166 | |
---|
1167 | CALL redblack( f_mg, p_mg ) |
---|
1168 | |
---|
1169 | ngsrb = ngsrb / 2 |
---|
1170 | |
---|
1171 | |
---|
1172 | ELSEIF ( grid_level /= 1 ) THEN |
---|
1173 | |
---|
1174 | grid_level_count(grid_level) = grid_level_count(grid_level) + 1 |
---|
1175 | |
---|
1176 | ! |
---|
1177 | !-- Solution on the actual grid level |
---|
1178 | CALL redblack( f_mg, p_mg ) |
---|
1179 | |
---|
1180 | ! |
---|
1181 | !-- Determination of the actual residual |
---|
1182 | CALL resid( f_mg, p_mg, r ) |
---|
1183 | |
---|
1184 | ! |
---|
1185 | !-- Restriction of the residual (finer grid values!) to the next coarser |
---|
1186 | !-- grid. Therefore, the grid level has to be decremented now. nxl..nzt have |
---|
1187 | !-- to be set to the coarse grid values, because these variables are needed |
---|
1188 | !-- for the exchange of ghost points in routine exchange_horiz |
---|
1189 | grid_level = grid_level - 1 |
---|
1190 | nxl = nxl_mg(grid_level) |
---|
1191 | nys = nys_mg(grid_level) |
---|
1192 | nxr = nxr_mg(grid_level) |
---|
1193 | nyn = nyn_mg(grid_level) |
---|
1194 | nzt = nzt_mg(grid_level) |
---|
1195 | |
---|
1196 | IF ( grid_level == mg_switch_to_pe0_level ) THEN |
---|
1197 | |
---|
1198 | ! |
---|
1199 | !-- From this level on, calculations are done on PE0 only. |
---|
1200 | !-- First, carry out restriction on the subdomain. |
---|
1201 | !-- Therefore, indices of the level have to be changed to subdomain values |
---|
1202 | !-- in between (otherwise, the restrict routine would expect |
---|
1203 | !-- the gathered array) |
---|
1204 | |
---|
1205 | nxl_mg_save = nxl_mg(grid_level) |
---|
1206 | nxr_mg_save = nxr_mg(grid_level) |
---|
1207 | nys_mg_save = nys_mg(grid_level) |
---|
1208 | nyn_mg_save = nyn_mg(grid_level) |
---|
1209 | nzt_mg_save = nzt_mg(grid_level) |
---|
1210 | nxl_mg(grid_level) = mg_loc_ind(1,myid) |
---|
1211 | nxr_mg(grid_level) = mg_loc_ind(2,myid) |
---|
1212 | nys_mg(grid_level) = mg_loc_ind(3,myid) |
---|
1213 | nyn_mg(grid_level) = mg_loc_ind(4,myid) |
---|
1214 | nzt_mg(grid_level) = mg_loc_ind(5,myid) |
---|
1215 | nxl = mg_loc_ind(1,myid) |
---|
1216 | nxr = mg_loc_ind(2,myid) |
---|
1217 | nys = mg_loc_ind(3,myid) |
---|
1218 | nyn = mg_loc_ind(4,myid) |
---|
1219 | nzt = mg_loc_ind(5,myid) |
---|
1220 | |
---|
1221 | ALLOCATE( f2_sub(nzb:nzt_mg(grid_level)+1, & |
---|
1222 | nys_mg(grid_level)-1:nyn_mg(grid_level)+1, & |
---|
1223 | nxl_mg(grid_level)-1:nxr_mg(grid_level)+1) ) |
---|
1224 | |
---|
1225 | CALL restrict( f2_sub, r ) |
---|
1226 | |
---|
1227 | ! |
---|
1228 | !-- Restore the correct indices of this level |
---|
1229 | nxl_mg(grid_level) = nxl_mg_save |
---|
1230 | nxr_mg(grid_level) = nxr_mg_save |
---|
1231 | nys_mg(grid_level) = nys_mg_save |
---|
1232 | nyn_mg(grid_level) = nyn_mg_save |
---|
1233 | nzt_mg(grid_level) = nzt_mg_save |
---|
1234 | nxl = nxl_mg(grid_level) |
---|
1235 | nxr = nxr_mg(grid_level) |
---|
1236 | nys = nys_mg(grid_level) |
---|
1237 | nyn = nyn_mg(grid_level) |
---|
1238 | nzt = nzt_mg(grid_level) |
---|
1239 | ! |
---|
1240 | !-- Gather all arrays from the subdomains on PE0 |
---|
1241 | CALL mg_gather( f2, f2_sub ) |
---|
1242 | |
---|
1243 | ! |
---|
1244 | !-- Set switch for routine exchange_horiz, that no ghostpoint exchange |
---|
1245 | !-- has to be carried out from now on |
---|
1246 | mg_switch_to_pe0 = .TRUE. |
---|
1247 | |
---|
1248 | ! |
---|
1249 | !-- In case of non-cyclic lateral boundary conditions, both in- and |
---|
1250 | !-- outflow conditions have to be used on all PEs after the switch, |
---|
1251 | !-- because then they have the total domain. |
---|
1252 | IF ( bc_lr_dirrad ) THEN |
---|
1253 | inflow_l = .TRUE. |
---|
1254 | inflow_r = .FALSE. |
---|
1255 | outflow_l = .FALSE. |
---|
1256 | outflow_r = .TRUE. |
---|
1257 | ELSEIF ( bc_lr_raddir ) THEN |
---|
1258 | inflow_l = .FALSE. |
---|
1259 | inflow_r = .TRUE. |
---|
1260 | outflow_l = .TRUE. |
---|
1261 | outflow_r = .FALSE. |
---|
1262 | ENDIF |
---|
1263 | |
---|
1264 | IF ( bc_ns_dirrad ) THEN |
---|
1265 | inflow_n = .TRUE. |
---|
1266 | inflow_s = .FALSE. |
---|
1267 | outflow_n = .FALSE. |
---|
1268 | outflow_s = .TRUE. |
---|
1269 | ELSEIF ( bc_ns_raddir ) THEN |
---|
1270 | inflow_n = .FALSE. |
---|
1271 | inflow_s = .TRUE. |
---|
1272 | outflow_n = .TRUE. |
---|
1273 | outflow_s = .FALSE. |
---|
1274 | ENDIF |
---|
1275 | |
---|
1276 | DEALLOCATE( f2_sub ) |
---|
1277 | |
---|
1278 | ELSE |
---|
1279 | |
---|
1280 | CALL restrict( f2, r ) |
---|
1281 | |
---|
1282 | ENDIF |
---|
1283 | |
---|
1284 | p2 = 0.0 |
---|
1285 | |
---|
1286 | ! |
---|
1287 | !-- Repeat the same procedure till the coarsest grid is reached |
---|
1288 | CALL next_mg_level( f2, p2, p3, r ) |
---|
1289 | |
---|
1290 | ENDIF |
---|
1291 | |
---|
1292 | ! |
---|
1293 | !-- Now follows the prolongation |
---|
1294 | IF ( grid_level >= 2 ) THEN |
---|
1295 | |
---|
1296 | ! |
---|
1297 | !-- Prolongation of the new residual. The values are transferred |
---|
1298 | !-- from the coarse to the next finer grid. |
---|
1299 | IF ( grid_level == mg_switch_to_pe0_level+1 ) THEN |
---|
1300 | |
---|
1301 | #if defined( __parallel ) |
---|
1302 | ! |
---|
1303 | !-- At this level, the new residual first has to be scattered from |
---|
1304 | !-- PE0 to the other PEs |
---|
1305 | ALLOCATE( p2_sub(nzb:mg_loc_ind(5,myid)+1, & |
---|
1306 | mg_loc_ind(3,myid)-1:mg_loc_ind(4,myid)+1, & |
---|
1307 | mg_loc_ind(1,myid)-1:mg_loc_ind(2,myid)+1) ) |
---|
1308 | |
---|
1309 | CALL mg_scatter( p2, p2_sub ) |
---|
1310 | |
---|
1311 | ! |
---|
1312 | !-- Therefore, indices of the previous level have to be changed to |
---|
1313 | !-- subdomain values in between (otherwise, the prolong routine would |
---|
1314 | !-- expect the gathered array) |
---|
1315 | nxl_mg_save = nxl_mg(grid_level-1) |
---|
1316 | nxr_mg_save = nxr_mg(grid_level-1) |
---|
1317 | nys_mg_save = nys_mg(grid_level-1) |
---|
1318 | nyn_mg_save = nyn_mg(grid_level-1) |
---|
1319 | nzt_mg_save = nzt_mg(grid_level-1) |
---|
1320 | nxl_mg(grid_level-1) = mg_loc_ind(1,myid) |
---|
1321 | nxr_mg(grid_level-1) = mg_loc_ind(2,myid) |
---|
1322 | nys_mg(grid_level-1) = mg_loc_ind(3,myid) |
---|
1323 | nyn_mg(grid_level-1) = mg_loc_ind(4,myid) |
---|
1324 | nzt_mg(grid_level-1) = mg_loc_ind(5,myid) |
---|
1325 | |
---|
1326 | ! |
---|
1327 | !-- Set switch for routine exchange_horiz, that ghostpoint exchange |
---|
1328 | !-- has to be carried again out from now on |
---|
1329 | mg_switch_to_pe0 = .FALSE. |
---|
1330 | |
---|
1331 | ! |
---|
1332 | !-- For non-cyclic lateral boundary conditions, restore the |
---|
1333 | !-- in-/outflow conditions |
---|
1334 | inflow_l = .FALSE.; inflow_r = .FALSE. |
---|
1335 | inflow_n = .FALSE.; inflow_s = .FALSE. |
---|
1336 | outflow_l = .FALSE.; outflow_r = .FALSE. |
---|
1337 | outflow_n = .FALSE.; outflow_s = .FALSE. |
---|
1338 | |
---|
1339 | IF ( pleft == MPI_PROC_NULL ) THEN |
---|
1340 | IF ( bc_lr_dirrad ) THEN |
---|
1341 | inflow_l = .TRUE. |
---|
1342 | ELSEIF ( bc_lr_raddir ) THEN |
---|
1343 | outflow_l = .TRUE. |
---|
1344 | ENDIF |
---|
1345 | ENDIF |
---|
1346 | |
---|
1347 | IF ( pright == MPI_PROC_NULL ) THEN |
---|
1348 | IF ( bc_lr_dirrad ) THEN |
---|
1349 | outflow_r = .TRUE. |
---|
1350 | ELSEIF ( bc_lr_raddir ) THEN |
---|
1351 | inflow_r = .TRUE. |
---|
1352 | ENDIF |
---|
1353 | ENDIF |
---|
1354 | |
---|
1355 | IF ( psouth == MPI_PROC_NULL ) THEN |
---|
1356 | IF ( bc_ns_dirrad ) THEN |
---|
1357 | outflow_s = .TRUE. |
---|
1358 | ELSEIF ( bc_ns_raddir ) THEN |
---|
1359 | inflow_s = .TRUE. |
---|
1360 | ENDIF |
---|
1361 | ENDIF |
---|
1362 | |
---|
1363 | IF ( pnorth == MPI_PROC_NULL ) THEN |
---|
1364 | IF ( bc_ns_dirrad ) THEN |
---|
1365 | inflow_n = .TRUE. |
---|
1366 | ELSEIF ( bc_ns_raddir ) THEN |
---|
1367 | outflow_n = .TRUE. |
---|
1368 | ENDIF |
---|
1369 | ENDIF |
---|
1370 | |
---|
1371 | CALL prolong( p2_sub, p3 ) |
---|
1372 | |
---|
1373 | ! |
---|
1374 | !-- Restore the correct indices of the previous level |
---|
1375 | nxl_mg(grid_level-1) = nxl_mg_save |
---|
1376 | nxr_mg(grid_level-1) = nxr_mg_save |
---|
1377 | nys_mg(grid_level-1) = nys_mg_save |
---|
1378 | nyn_mg(grid_level-1) = nyn_mg_save |
---|
1379 | nzt_mg(grid_level-1) = nzt_mg_save |
---|
1380 | |
---|
1381 | DEALLOCATE( p2_sub ) |
---|
1382 | #endif |
---|
1383 | |
---|
1384 | ELSE |
---|
1385 | |
---|
1386 | CALL prolong( p2, p3 ) |
---|
1387 | |
---|
1388 | ENDIF |
---|
1389 | |
---|
1390 | ! |
---|
1391 | !-- Computation of the new pressure correction. Therefore, |
---|
1392 | !-- values from prior grids are added up automatically stage by stage. |
---|
1393 | DO i = nxl_mg(grid_level)-1, nxr_mg(grid_level)+1 |
---|
1394 | DO j = nys_mg(grid_level)-1, nyn_mg(grid_level)+1 |
---|
1395 | DO k = nzb, nzt_mg(grid_level)+1 |
---|
1396 | p_mg(k,j,i) = p_mg(k,j,i) + p3(k,j,i) |
---|
1397 | ENDDO |
---|
1398 | ENDDO |
---|
1399 | ENDDO |
---|
1400 | |
---|
1401 | ! |
---|
1402 | !-- Relaxation of the new solution |
---|
1403 | CALL redblack( f_mg, p_mg ) |
---|
1404 | |
---|
1405 | ENDIF |
---|
1406 | |
---|
1407 | |
---|
1408 | ! |
---|
1409 | !-- The following few lines serve the steering of the multigrid scheme |
---|
1410 | IF ( grid_level == maximum_grid_level ) THEN |
---|
1411 | |
---|
1412 | GOTO 20 |
---|
1413 | |
---|
1414 | ELSEIF ( grid_level /= maximum_grid_level .AND. grid_level /= 1 .AND. & |
---|
1415 | grid_level_count(grid_level) /= gamma_mg ) THEN |
---|
1416 | |
---|
1417 | GOTO 10 |
---|
1418 | |
---|
1419 | ENDIF |
---|
1420 | |
---|
1421 | ! |
---|
1422 | !-- Reset counter for the next call of poismg |
---|
1423 | grid_level_count(grid_level) = 0 |
---|
1424 | |
---|
1425 | ! |
---|
1426 | !-- Continue with the next finer level. nxl..nzt have to be |
---|
1427 | !-- set to the finer grid values, because these variables are needed for the |
---|
1428 | !-- exchange of ghost points in routine exchange_horiz |
---|
1429 | grid_level = grid_level + 1 |
---|
1430 | nxl = nxl_mg(grid_level) |
---|
1431 | nxr = nxr_mg(grid_level) |
---|
1432 | nys = nys_mg(grid_level) |
---|
1433 | nyn = nyn_mg(grid_level) |
---|
1434 | nzt = nzt_mg(grid_level) |
---|
1435 | |
---|
1436 | 20 CONTINUE |
---|
1437 | |
---|
1438 | END SUBROUTINE next_mg_level |
---|