1 | !> @file pres.f90 |
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2 | !------------------------------------------------------------------------------! |
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3 | ! This file is part of the PALM model system. |
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4 | ! |
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5 | ! PALM is free software: you can redistribute it and/or modify it under the |
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6 | ! terms of the GNU General Public License as published by the Free Software |
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7 | ! Foundation, either version 3 of the License, or (at your option) any later |
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8 | ! version. |
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9 | ! |
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10 | ! PALM is distributed in the hope that it will be useful, but WITHOUT ANY |
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11 | ! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR |
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12 | ! A PARTICULAR PURPOSE. See the GNU General Public License for more details. |
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13 | ! |
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14 | ! You should have received a copy of the GNU General Public License along with |
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15 | ! PALM. If not, see <http://www.gnu.org/licenses/>. |
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16 | ! |
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17 | ! Copyright 1997-2019 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: pres.f90 3849 2019-04-01 16:35:16Z suehring $ |
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27 | ! OpenACC port for SPEC |
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28 | ! |
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29 | ! 3347 2018-10-15 14:21:08Z suehring |
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30 | ! Bugfixes in offline nesting. |
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31 | ! Add comment. |
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32 | ! |
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33 | ! 3341 2018-10-15 10:31:27Z suehring |
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34 | ! Rename variables for boundary flags and nesting |
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35 | ! |
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36 | ! 3182 2018-07-27 13:36:03Z suehring |
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37 | ! Dollar sign added before Id |
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38 | ! |
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39 | ! 2696 2017-12-14 17:12:51Z kanani |
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40 | ! To avoid jumps while plotting w-profiles w level nzt+1 is set to w level nzt |
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41 | ! after velocity modifications through the pressure solver were carried out |
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42 | ! |
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43 | ! 2696 2017-12-14 17:12:51Z kanani |
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44 | ! Corrected "Former revisions" section |
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45 | ! |
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46 | ! 2696 2017-12-14 17:12:51Z kanani |
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47 | ! Change in file header (GPL part) |
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48 | ! poismg_noopt modularized (MS) |
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49 | ! |
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50 | ! 2298 2017-06-29 09:28:18Z raasch |
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51 | ! comment changed + some formatting |
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52 | ! |
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53 | ! 2233 2017-05-30 18:08:54Z suehring |
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54 | ! |
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55 | ! 2232 2017-05-30 17:47:52Z suehring |
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56 | ! Adjustments to new topography and surface concept |
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57 | ! |
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58 | ! 2118 2017-01-17 16:38:49Z raasch |
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59 | ! OpenACC directives and related code removed |
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60 | ! |
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61 | ! 2073 2016-11-30 14:34:05Z raasch |
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62 | ! openmp bugfix for calculation of new divergence |
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63 | ! |
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64 | ! 2037 2016-10-26 11:15:40Z knoop |
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65 | ! Anelastic approximation implemented |
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66 | ! |
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67 | ! 2000 2016-08-20 18:09:15Z knoop |
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68 | ! Forced header and separation lines into 80 columns |
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69 | ! |
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70 | ! 1932 2016-06-10 12:09:21Z suehring |
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71 | ! Initial version of purely vertical nesting introduced. |
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72 | ! |
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73 | ! 1931 2016-06-10 12:06:59Z suehring |
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74 | ! Rename multigrid into multigrid_noopt and multigrid_fast into multigrid |
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75 | ! |
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76 | ! 1929 2016-06-09 16:25:25Z suehring |
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77 | ! Bugfix: weight_substep for initial call, replace by local variable |
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78 | ! |
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79 | ! 1918 2016-05-27 14:35:57Z raasch |
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80 | ! sum of divergence is also calculated when pres is called before the initial |
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81 | ! first time step, |
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82 | ! stearing is modified by using intermediate_timestep_count = 0 in order to |
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83 | ! determine if pres is called before the first initial timestep, |
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84 | ! bugfix: in case of Neumann conditions for pressure both at bottom and top, |
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85 | ! mean vertical velocity is also removed for the first time step |
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86 | ! bugfix for calculating divergences |
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87 | ! |
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88 | ! 1908 2016-05-25 17:22:32Z suehring |
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89 | ! New divergence for output into RUN_CONTROL file is calculated only at last |
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90 | ! Runge-Kutta step |
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91 | ! |
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92 | ! 1845 2016-04-08 08:29:13Z raasch |
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93 | ! nzb_2d replace by nzb_u|v_inner |
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94 | ! |
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95 | ! 1799 2016-04-05 08:35:55Z gronemeier |
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96 | ! Bugfix: excluded third dimension from horizontal volume flow calculation |
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97 | ! |
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98 | ! 1762 2016-02-25 12:31:13Z hellstea |
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99 | ! Introduction of nested domain feature |
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100 | ! |
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101 | ! 1682 2015-10-07 23:56:08Z knoop |
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102 | ! Code annotations made doxygen readable |
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103 | ! |
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104 | ! 1575 2015-03-27 09:56:27Z raasch |
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105 | ! poismg_fast + respective module added, adjustments for psolver-queries |
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106 | ! |
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107 | ! 1342 2014-03-26 17:04:47Z kanani |
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108 | ! REAL constants defined as wp-kind |
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109 | ! |
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110 | ! 1320 2014-03-20 08:40:49Z raasch |
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111 | ! ONLY-attribute added to USE-statements, |
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112 | ! kind-parameters added to all INTEGER and REAL declaration statements, |
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113 | ! kinds are defined in new module kinds, |
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114 | ! old module precision_kind is removed, |
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115 | ! revision history before 2012 removed, |
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116 | ! comment fields (!:) to be used for variable explanations added to |
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117 | ! all variable declaration statements |
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118 | ! |
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119 | ! 1318 2014-03-17 13:35:16Z raasch |
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120 | ! module interfaces removed |
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121 | ! |
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122 | ! 1306 2014-03-13 14:30:59Z raasch |
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123 | ! second argument removed from routine poisfft |
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124 | ! |
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125 | ! 1257 2013-11-08 15:18:40Z raasch |
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126 | ! openacc loop and loop vector clauses removed, independent clauses added, |
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127 | ! end parallel replaced by end parallel loop |
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128 | ! |
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129 | ! 1221 2013-09-10 08:59:13Z raasch |
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130 | ! openACC porting of reduction operations, loops for calculating d are |
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131 | ! using the rflags_s_inner multiply flag instead of the nzb_s_inner loop index |
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132 | ! |
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133 | ! 1212 2013-08-15 08:46:27Z raasch |
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134 | ! call of poisfft_hybrid removed |
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135 | ! |
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136 | ! 1117 2013-03-27 11:15:36Z suehring |
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137 | ! Bugfix in OpenMP parallelization. |
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138 | ! |
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139 | ! 1113 2013-03-10 02:48:14Z raasch |
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140 | ! GPU-porting of several loops, some loops rearranged |
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141 | ! |
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142 | ! 1111 2013-03-08 23:54:10Z |
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143 | ! openACC statements added, |
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144 | ! ibc_p_b = 2 removed |
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145 | ! |
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146 | ! 1092 2013-02-02 11:24:22Z raasch |
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147 | ! unused variables removed |
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148 | ! |
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149 | ! 1036 2012-10-22 13:43:42Z raasch |
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150 | ! code put under GPL (PALM 3.9) |
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151 | ! |
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152 | ! 1003 2012-09-14 14:35:53Z raasch |
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153 | ! adjustment of array tend for cases with unequal subdomain sizes removed |
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154 | ! |
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155 | ! Revision 1.1 1997/07/24 11:24:44 raasch |
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156 | ! Initial revision |
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157 | ! |
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158 | ! |
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159 | ! Description: |
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160 | ! ------------ |
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161 | !> Compute the divergence of the provisional velocity field. Solve the Poisson |
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162 | !> equation for the perturbation pressure. Compute the final velocities using |
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163 | !> this perturbation pressure. Compute the remaining divergence. |
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164 | !------------------------------------------------------------------------------! |
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165 | SUBROUTINE pres |
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166 | |
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167 | |
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168 | USE arrays_3d, & |
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169 | ONLY: d, ddzu, ddzu_pres, ddzw, dzw, p, p_loc, rho_air, rho_air_zw, & |
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170 | tend, u, v, w |
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171 | |
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172 | USE control_parameters, & |
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173 | ONLY: bc_lr_cyc, bc_ns_cyc, bc_radiation_l, bc_radiation_n, & |
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174 | bc_radiation_r, bc_radiation_s, child_domain, & |
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175 | conserve_volume_flow, coupling_mode, & |
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176 | dt_3d, gathered_size, ibc_p_b, ibc_p_t, & |
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177 | intermediate_timestep_count, intermediate_timestep_count_max, & |
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178 | mg_switch_to_pe0_level, nesting_offline, & |
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179 | psolver, subdomain_size, & |
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180 | topography, volume_flow, volume_flow_area, volume_flow_initial |
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181 | |
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182 | USE cpulog, & |
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183 | ONLY: cpu_log, log_point, log_point_s |
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184 | |
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185 | USE grid_variables, & |
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186 | ONLY: ddx, ddy |
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187 | |
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188 | USE indices, & |
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189 | ONLY: nbgp, ngp_2dh_outer, nx, nxl, nxlg, nxl_mg, nxr, nxrg, nxr_mg, & |
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190 | ny, nys, nysg, nys_mg, nyn, nyng, nyn_mg, nzb, nzt, nzt_mg, & |
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191 | wall_flags_0 |
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192 | |
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193 | USE kinds |
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194 | |
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195 | USE pegrid |
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196 | |
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197 | USE pmc_interface, & |
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198 | ONLY: nesting_mode |
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199 | |
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200 | USE poisfft_mod, & |
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201 | ONLY: poisfft |
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202 | |
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203 | USE poismg_mod |
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204 | |
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205 | USE poismg_noopt_mod |
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206 | |
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207 | USE statistics, & |
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208 | ONLY: statistic_regions, sums_divnew_l, sums_divold_l, weight_pres, & |
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209 | weight_substep |
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210 | |
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211 | USE surface_mod, & |
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212 | ONLY : bc_h |
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213 | |
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214 | IMPLICIT NONE |
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215 | |
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216 | INTEGER(iwp) :: i !< |
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217 | INTEGER(iwp) :: j !< |
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218 | INTEGER(iwp) :: k !< |
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219 | INTEGER(iwp) :: m !< |
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220 | |
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221 | REAL(wp) :: ddt_3d !< |
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222 | REAL(wp) :: d_weight_pres !< |
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223 | REAL(wp) :: localsum !< |
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224 | REAL(wp) :: threadsum !< |
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225 | REAL(wp) :: weight_pres_l !< |
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226 | REAL(wp) :: weight_substep_l !< |
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227 | |
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228 | REAL(wp), DIMENSION(1:3) :: volume_flow_l !< |
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229 | REAL(wp), DIMENSION(1:3) :: volume_flow_offset !< |
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230 | REAL(wp), DIMENSION(1:nzt) :: w_l !< |
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231 | REAL(wp), DIMENSION(1:nzt) :: w_l_l !< |
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232 | |
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233 | LOGICAL :: child_domain_nvn !< |
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234 | |
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235 | |
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236 | CALL cpu_log( log_point(8), 'pres', 'start' ) |
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237 | |
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238 | ! |
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239 | !-- Calculate quantities to be used locally |
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240 | ddt_3d = 1.0_wp / dt_3d |
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241 | IF ( intermediate_timestep_count == 0 ) THEN |
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242 | ! |
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243 | !-- If pres is called before initial time step |
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244 | weight_pres_l = 1.0_wp |
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245 | d_weight_pres = 1.0_wp |
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246 | weight_substep_l = 1.0_wp |
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247 | ELSE |
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248 | weight_pres_l = weight_pres(intermediate_timestep_count) |
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249 | d_weight_pres = 1.0_wp / weight_pres(intermediate_timestep_count) |
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250 | weight_substep_l = weight_substep(intermediate_timestep_count) |
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251 | ENDIF |
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252 | |
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253 | ! |
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254 | !-- Multigrid method expects array d to have one ghost layer. |
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255 | !-- |
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256 | IF ( psolver(1:9) == 'multigrid' ) THEN |
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257 | |
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258 | DEALLOCATE( d ) |
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259 | ALLOCATE( d(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1) ) |
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260 | |
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261 | ! |
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262 | !-- Since p is later used to hold the weighted average of the substeps, it |
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263 | !-- cannot be used in the iterative solver. Therefore, its initial value is |
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264 | !-- stored on p_loc, which is then iteratively advanced in every substep. |
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265 | IF ( intermediate_timestep_count <= 1 ) THEN |
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266 | DO i = nxl-1, nxr+1 |
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267 | DO j = nys-1, nyn+1 |
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268 | DO k = nzb, nzt+1 |
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269 | p_loc(k,j,i) = p(k,j,i) |
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270 | ENDDO |
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271 | ENDDO |
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272 | ENDDO |
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273 | ENDIF |
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274 | |
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275 | ELSEIF ( psolver == 'sor' .AND. intermediate_timestep_count <= 1 ) THEN |
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276 | |
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277 | ! |
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278 | !-- Since p is later used to hold the weighted average of the substeps, it |
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279 | !-- cannot be used in the iterative solver. Therefore, its initial value is |
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280 | !-- stored on p_loc, which is then iteratively advanced in every substep. |
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281 | p_loc = p |
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282 | |
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283 | ENDIF |
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284 | |
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285 | ! |
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286 | !-- Conserve the volume flow at the outflow in case of non-cyclic lateral |
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287 | !-- boundary conditions |
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288 | !-- WARNING: so far, this conservation does not work at the left/south |
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289 | !-- boundary if the topography at the inflow differs from that at the |
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290 | !-- outflow! For this case, volume_flow_area needs adjustment! |
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291 | ! |
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292 | !-- Left/right |
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293 | IF ( conserve_volume_flow .AND. ( bc_radiation_l .OR. & |
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294 | bc_radiation_r ) ) THEN |
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295 | |
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296 | volume_flow(1) = 0.0_wp |
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297 | volume_flow_l(1) = 0.0_wp |
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298 | |
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299 | IF ( bc_radiation_l ) THEN |
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300 | i = 0 |
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301 | ELSEIF ( bc_radiation_r ) THEN |
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302 | i = nx+1 |
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303 | ENDIF |
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304 | |
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305 | DO j = nys, nyn |
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306 | ! |
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307 | !-- Sum up the volume flow through the south/north boundary |
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308 | DO k = nzb+1, nzt |
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309 | volume_flow_l(1) = volume_flow_l(1) + u(k,j,i) * dzw(k) & |
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310 | * MERGE( 1.0_wp, 0.0_wp, & |
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311 | BTEST( wall_flags_0(k,j,i), 1 ) & |
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312 | ) |
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313 | ENDDO |
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314 | ENDDO |
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315 | |
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316 | #if defined( __parallel ) |
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317 | IF ( collective_wait ) CALL MPI_BARRIER( comm1dy, ierr ) |
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318 | CALL MPI_ALLREDUCE( volume_flow_l(1), volume_flow(1), 1, MPI_REAL, & |
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319 | MPI_SUM, comm1dy, ierr ) |
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320 | #else |
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321 | volume_flow = volume_flow_l |
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322 | #endif |
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323 | volume_flow_offset(1) = ( volume_flow_initial(1) - volume_flow(1) ) & |
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324 | / volume_flow_area(1) |
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325 | |
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326 | DO j = nysg, nyng |
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327 | DO k = nzb+1, nzt |
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328 | u(k,j,i) = u(k,j,i) + volume_flow_offset(1) & |
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329 | * MERGE( 1.0_wp, 0.0_wp, & |
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330 | BTEST( wall_flags_0(k,j,i), 1 ) & |
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331 | ) |
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332 | ENDDO |
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333 | ENDDO |
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334 | |
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335 | ENDIF |
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336 | |
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337 | ! |
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338 | !-- South/north |
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339 | IF ( conserve_volume_flow .AND. ( bc_radiation_n .OR. bc_radiation_s ) ) THEN |
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340 | |
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341 | volume_flow(2) = 0.0_wp |
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342 | volume_flow_l(2) = 0.0_wp |
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343 | |
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344 | IF ( bc_radiation_s ) THEN |
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345 | j = 0 |
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346 | ELSEIF ( bc_radiation_n ) THEN |
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347 | j = ny+1 |
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348 | ENDIF |
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349 | |
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350 | DO i = nxl, nxr |
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351 | ! |
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352 | !-- Sum up the volume flow through the south/north boundary |
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353 | DO k = nzb+1, nzt |
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354 | volume_flow_l(2) = volume_flow_l(2) + v(k,j,i) * dzw(k) & |
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355 | * MERGE( 1.0_wp, 0.0_wp, & |
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356 | BTEST( wall_flags_0(k,j,i), 2 ) & |
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357 | ) |
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358 | ENDDO |
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359 | ENDDO |
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360 | |
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361 | #if defined( __parallel ) |
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362 | IF ( collective_wait ) CALL MPI_BARRIER( comm1dx, ierr ) |
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363 | CALL MPI_ALLREDUCE( volume_flow_l(2), volume_flow(2), 1, MPI_REAL, & |
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364 | MPI_SUM, comm1dx, ierr ) |
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365 | #else |
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366 | volume_flow = volume_flow_l |
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367 | #endif |
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368 | volume_flow_offset(2) = ( volume_flow_initial(2) - volume_flow(2) ) & |
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369 | / volume_flow_area(2) |
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370 | |
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371 | DO i = nxlg, nxrg |
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372 | DO k = nzb+1, nzt |
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373 | v(k,j,i) = v(k,j,i) + volume_flow_offset(2) & |
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374 | * MERGE( 1.0_wp, 0.0_wp, & |
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375 | BTEST( wall_flags_0(k,j,i), 2 ) & |
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376 | ) |
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377 | ENDDO |
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378 | ENDDO |
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379 | |
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380 | ENDIF |
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381 | |
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382 | ! |
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383 | !-- Remove mean vertical velocity in case that Neumann conditions are |
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384 | !-- used both at bottom and top boundary, and if not a nested domain in a |
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385 | !-- normal nesting run. In case of vertical nesting, this must be done. |
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386 | !-- Therefore an auxiliary logical variable child_domain_nvn is used here, and |
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387 | !-- nvn stands for non-vertical nesting. |
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388 | !-- This cannot be done before the first initial time step because ngp_2dh_outer |
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389 | !-- is not yet known then. |
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390 | child_domain_nvn = child_domain |
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391 | IF ( child_domain .AND. nesting_mode == 'vertical' ) THEN |
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392 | child_domain_nvn = .FALSE. |
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393 | ENDIF |
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394 | |
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395 | IF ( ibc_p_b == 1 .AND. ibc_p_t == 1 .AND. .NOT. nesting_offline .AND. & |
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396 | .NOT. child_domain_nvn .AND. intermediate_timestep_count /= 0 ) & |
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397 | THEN |
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398 | w_l = 0.0_wp; w_l_l = 0.0_wp |
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399 | DO i = nxl, nxr |
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400 | DO j = nys, nyn |
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401 | DO k = nzb+1, nzt |
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402 | w_l_l(k) = w_l_l(k) + w(k,j,i) & |
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403 | * MERGE( 1.0_wp, 0.0_wp, & |
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404 | BTEST( wall_flags_0(k,j,i), 3 ) & |
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405 | ) |
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406 | ENDDO |
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407 | ENDDO |
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408 | ENDDO |
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409 | #if defined( __parallel ) |
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410 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
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411 | CALL MPI_ALLREDUCE( w_l_l(1), w_l(1), nzt, MPI_REAL, MPI_SUM, & |
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412 | comm2d, ierr ) |
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413 | #else |
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414 | w_l = w_l_l |
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415 | #endif |
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416 | DO k = 1, nzt |
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417 | w_l(k) = w_l(k) / ngp_2dh_outer(k,0) |
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418 | ENDDO |
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419 | DO i = nxlg, nxrg |
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420 | DO j = nysg, nyng |
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421 | DO k = nzb+1, nzt |
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422 | w(k,j,i) = w(k,j,i) - w_l(k) & |
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423 | * MERGE( 1.0_wp, 0.0_wp, & |
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424 | BTEST( wall_flags_0(k,j,i), 3 ) & |
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425 | ) |
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426 | ENDDO |
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427 | ENDDO |
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428 | ENDDO |
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429 | ENDIF |
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430 | |
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431 | ! |
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432 | !-- Compute the divergence of the provisional velocity field. |
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433 | CALL cpu_log( log_point_s(1), 'divergence', 'start' ) |
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434 | |
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435 | IF ( psolver(1:9) == 'multigrid' ) THEN |
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436 | !$OMP PARALLEL DO SCHEDULE( STATIC ) PRIVATE (i,j,k) |
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437 | DO i = nxl-1, nxr+1 |
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438 | DO j = nys-1, nyn+1 |
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439 | DO k = nzb, nzt+1 |
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440 | d(k,j,i) = 0.0_wp |
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441 | ENDDO |
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442 | ENDDO |
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443 | ENDDO |
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444 | ELSE |
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445 | !$OMP PARALLEL DO SCHEDULE( STATIC ) PRIVATE (i,j,k) |
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446 | !$ACC PARALLEL LOOP COLLAPSE(3) PRIVATE(i, j, k) & |
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447 | !$ACC PRESENT(d) |
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448 | DO i = nxl, nxr |
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449 | DO j = nys, nyn |
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450 | DO k = nzb+1, nzt |
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451 | d(k,j,i) = 0.0_wp |
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452 | ENDDO |
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453 | ENDDO |
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454 | ENDDO |
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455 | ENDIF |
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456 | |
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457 | localsum = 0.0_wp |
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458 | threadsum = 0.0_wp |
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459 | |
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460 | #if defined( __ibm ) |
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461 | !$OMP PARALLEL PRIVATE (i,j,k) FIRSTPRIVATE(threadsum) REDUCTION(+:localsum) |
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462 | !$OMP DO SCHEDULE( STATIC ) |
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463 | DO i = nxl, nxr |
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464 | DO j = nys, nyn |
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465 | DO k = nzb+1, nzt |
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466 | d(k,j,i) = ( ( u(k,j,i+1) - u(k,j,i) ) * rho_air(k) * ddx + & |
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467 | ( v(k,j+1,i) - v(k,j,i) ) * rho_air(k) * ddy + & |
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468 | ( w(k,j,i) * rho_air_zw(k) - & |
---|
469 | w(k-1,j,i) * rho_air_zw(k-1) ) * ddzw(k) & |
---|
470 | ) * ddt_3d * d_weight_pres & |
---|
471 | * MERGE( 1.0_wp, 0.0_wp, & |
---|
472 | BTEST( wall_flags_0(k,j,i), 0 ) & |
---|
473 | ) |
---|
474 | ENDDO |
---|
475 | ! |
---|
476 | !-- Compute possible PE-sum of divergences for flow_statistics |
---|
477 | DO k = nzb+1, nzt |
---|
478 | threadsum = threadsum + ABS( d(k,j,i) ) & |
---|
479 | * MERGE( 1.0_wp, 0.0_wp, & |
---|
480 | BTEST( wall_flags_0(k,j,i), 0 ) & |
---|
481 | ) |
---|
482 | ENDDO |
---|
483 | |
---|
484 | ENDDO |
---|
485 | ENDDO |
---|
486 | |
---|
487 | IF ( intermediate_timestep_count == intermediate_timestep_count_max .OR. & |
---|
488 | intermediate_timestep_count == 0 ) THEN |
---|
489 | localsum = localsum + threadsum * dt_3d * weight_pres_l |
---|
490 | ENDIF |
---|
491 | !$OMP END PARALLEL |
---|
492 | #else |
---|
493 | |
---|
494 | !$OMP PARALLEL PRIVATE (i,j,k) |
---|
495 | !$OMP DO SCHEDULE( STATIC ) |
---|
496 | !$ACC PARALLEL LOOP COLLAPSE(3) PRIVATE(i, j, k) & |
---|
497 | !$ACC PRESENT(u, v, w, rho_air, rho_air_zw, ddzw, wall_flags_0) & |
---|
498 | !$ACC PRESENT(d) |
---|
499 | DO i = nxl, nxr |
---|
500 | DO j = nys, nyn |
---|
501 | DO k = 1, nzt |
---|
502 | d(k,j,i) = ( ( u(k,j,i+1) - u(k,j,i) ) * rho_air(k) * ddx + & |
---|
503 | ( v(k,j+1,i) - v(k,j,i) ) * rho_air(k) * ddy + & |
---|
504 | ( w(k,j,i) * rho_air_zw(k) - & |
---|
505 | w(k-1,j,i) * rho_air_zw(k-1) ) * ddzw(k) & |
---|
506 | ) * ddt_3d * d_weight_pres & |
---|
507 | * MERGE( 1.0_wp, 0.0_wp, & |
---|
508 | BTEST( wall_flags_0(k,j,i), 0 ) & |
---|
509 | ) |
---|
510 | ENDDO |
---|
511 | ENDDO |
---|
512 | ENDDO |
---|
513 | !$OMP END PARALLEL |
---|
514 | |
---|
515 | ! |
---|
516 | !-- Compute possible PE-sum of divergences for flow_statistics. Carry out |
---|
517 | !-- computation only at last Runge-Kutta substep. |
---|
518 | IF ( intermediate_timestep_count == intermediate_timestep_count_max .OR. & |
---|
519 | intermediate_timestep_count == 0 ) THEN |
---|
520 | !$OMP PARALLEL PRIVATE (i,j,k) FIRSTPRIVATE(threadsum) REDUCTION(+:localsum) |
---|
521 | !$OMP DO SCHEDULE( STATIC ) |
---|
522 | !$ACC PARALLEL LOOP COLLAPSE(3) PRIVATE(i,j,k) & |
---|
523 | !$ACC REDUCTION(+:threadsum) COPY(threadsum) & |
---|
524 | !$ACC PRESENT(d) |
---|
525 | DO i = nxl, nxr |
---|
526 | DO j = nys, nyn |
---|
527 | DO k = nzb+1, nzt |
---|
528 | threadsum = threadsum + ABS( d(k,j,i) ) |
---|
529 | ENDDO |
---|
530 | ENDDO |
---|
531 | ENDDO |
---|
532 | localsum = localsum + threadsum * dt_3d * weight_pres_l |
---|
533 | !$OMP END PARALLEL |
---|
534 | ENDIF |
---|
535 | #endif |
---|
536 | |
---|
537 | ! |
---|
538 | !-- For completeness, set the divergence sum of all statistic regions to those |
---|
539 | !-- of the total domain |
---|
540 | IF ( intermediate_timestep_count == intermediate_timestep_count_max .OR. & |
---|
541 | intermediate_timestep_count == 0 ) THEN |
---|
542 | sums_divold_l(0:statistic_regions) = localsum |
---|
543 | ENDIF |
---|
544 | |
---|
545 | CALL cpu_log( log_point_s(1), 'divergence', 'stop' ) |
---|
546 | |
---|
547 | ! |
---|
548 | !-- Compute the pressure perturbation solving the Poisson equation |
---|
549 | IF ( psolver == 'poisfft' ) THEN |
---|
550 | |
---|
551 | ! |
---|
552 | !-- Solve Poisson equation via FFT and solution of tridiagonal matrices |
---|
553 | CALL poisfft( d ) |
---|
554 | |
---|
555 | ! |
---|
556 | !-- Store computed perturbation pressure and set boundary condition in |
---|
557 | !-- z-direction |
---|
558 | !$OMP PARALLEL DO PRIVATE (i,j,k) |
---|
559 | !$ACC PARALLEL LOOP COLLAPSE(3) PRIVATE(i, j, k) & |
---|
560 | !$ACC PRESENT(d, tend) |
---|
561 | DO i = nxl, nxr |
---|
562 | DO j = nys, nyn |
---|
563 | DO k = nzb+1, nzt |
---|
564 | tend(k,j,i) = d(k,j,i) |
---|
565 | ENDDO |
---|
566 | ENDDO |
---|
567 | ENDDO |
---|
568 | |
---|
569 | ! |
---|
570 | !-- Bottom boundary: |
---|
571 | !-- This condition is only required for internal output. The pressure |
---|
572 | !-- gradient (dp(nzb+1)-dp(nzb))/dz is not used anywhere else. |
---|
573 | IF ( ibc_p_b == 1 ) THEN |
---|
574 | ! |
---|
575 | !-- Neumann (dp/dz = 0). Using surfae data type, first for non-natural |
---|
576 | !-- surfaces, then for natural and urban surfaces |
---|
577 | !-- Upward facing |
---|
578 | !$OMP PARALLEL DO PRIVATE( i, j, k ) |
---|
579 | !$ACC PARALLEL LOOP PRIVATE(i, j, k) & |
---|
580 | !$ACC PRESENT(bc_h, tend) |
---|
581 | DO m = 1, bc_h(0)%ns |
---|
582 | i = bc_h(0)%i(m) |
---|
583 | j = bc_h(0)%j(m) |
---|
584 | k = bc_h(0)%k(m) |
---|
585 | tend(k-1,j,i) = tend(k,j,i) |
---|
586 | ENDDO |
---|
587 | ! |
---|
588 | !-- Downward facing |
---|
589 | !$OMP PARALLEL DO PRIVATE( i, j, k ) |
---|
590 | !$ACC PARALLEL LOOP PRIVATE(i, j, k) & |
---|
591 | !$ACC PRESENT(bc_h, tend) |
---|
592 | DO m = 1, bc_h(1)%ns |
---|
593 | i = bc_h(1)%i(m) |
---|
594 | j = bc_h(1)%j(m) |
---|
595 | k = bc_h(1)%k(m) |
---|
596 | tend(k+1,j,i) = tend(k,j,i) |
---|
597 | ENDDO |
---|
598 | |
---|
599 | ELSE |
---|
600 | ! |
---|
601 | !-- Dirichlet. Using surface data type, first for non-natural |
---|
602 | !-- surfaces, then for natural and urban surfaces |
---|
603 | !-- Upward facing |
---|
604 | !$OMP PARALLEL DO PRIVATE( i, j, k ) |
---|
605 | DO m = 1, bc_h(0)%ns |
---|
606 | i = bc_h(0)%i(m) |
---|
607 | j = bc_h(0)%j(m) |
---|
608 | k = bc_h(0)%k(m) |
---|
609 | tend(k-1,j,i) = 0.0_wp |
---|
610 | ENDDO |
---|
611 | ! |
---|
612 | !-- Downward facing |
---|
613 | !$OMP PARALLEL DO PRIVATE( i, j, k ) |
---|
614 | DO m = 1, bc_h(1)%ns |
---|
615 | i = bc_h(1)%i(m) |
---|
616 | j = bc_h(1)%j(m) |
---|
617 | k = bc_h(1)%k(m) |
---|
618 | tend(k+1,j,i) = 0.0_wp |
---|
619 | ENDDO |
---|
620 | |
---|
621 | ENDIF |
---|
622 | |
---|
623 | ! |
---|
624 | !-- Top boundary |
---|
625 | IF ( ibc_p_t == 1 ) THEN |
---|
626 | ! |
---|
627 | !-- Neumann |
---|
628 | !$OMP PARALLEL DO PRIVATE (i,j,k) |
---|
629 | DO i = nxlg, nxrg |
---|
630 | DO j = nysg, nyng |
---|
631 | tend(nzt+1,j,i) = tend(nzt,j,i) |
---|
632 | ENDDO |
---|
633 | ENDDO |
---|
634 | |
---|
635 | ELSE |
---|
636 | ! |
---|
637 | !-- Dirichlet |
---|
638 | !$OMP PARALLEL DO PRIVATE (i,j,k) |
---|
639 | !$ACC PARALLEL LOOP COLLAPSE(2) PRIVATE(i, j) & |
---|
640 | !$ACC PRESENT(tend) |
---|
641 | DO i = nxlg, nxrg |
---|
642 | DO j = nysg, nyng |
---|
643 | tend(nzt+1,j,i) = 0.0_wp |
---|
644 | ENDDO |
---|
645 | ENDDO |
---|
646 | |
---|
647 | ENDIF |
---|
648 | |
---|
649 | ! |
---|
650 | !-- Exchange boundaries for p |
---|
651 | CALL exchange_horiz( tend, nbgp ) |
---|
652 | |
---|
653 | ELSEIF ( psolver == 'sor' ) THEN |
---|
654 | |
---|
655 | ! |
---|
656 | !-- Solve Poisson equation for perturbation pressure using SOR-Red/Black |
---|
657 | !-- scheme |
---|
658 | CALL sor( d, ddzu_pres, ddzw, p_loc ) |
---|
659 | tend = p_loc |
---|
660 | |
---|
661 | ELSEIF ( psolver(1:9) == 'multigrid' ) THEN |
---|
662 | |
---|
663 | ! |
---|
664 | !-- Solve Poisson equation for perturbation pressure using Multigrid scheme, |
---|
665 | !-- array tend is used to store the residuals. |
---|
666 | |
---|
667 | !-- If the number of grid points of the gathered grid, which is collected |
---|
668 | !-- on PE0, is larger than the number of grid points of an PE, than array |
---|
669 | !-- tend will be enlarged. |
---|
670 | IF ( gathered_size > subdomain_size ) THEN |
---|
671 | DEALLOCATE( tend ) |
---|
672 | ALLOCATE( tend(nzb:nzt_mg(mg_switch_to_pe0_level)+1,nys_mg( & |
---|
673 | mg_switch_to_pe0_level)-1:nyn_mg(mg_switch_to_pe0_level)+1,& |
---|
674 | nxl_mg(mg_switch_to_pe0_level)-1:nxr_mg( & |
---|
675 | mg_switch_to_pe0_level)+1) ) |
---|
676 | ENDIF |
---|
677 | |
---|
678 | IF ( psolver == 'multigrid' ) THEN |
---|
679 | CALL poismg( tend ) |
---|
680 | ELSE |
---|
681 | CALL poismg_noopt( tend ) |
---|
682 | ENDIF |
---|
683 | |
---|
684 | IF ( gathered_size > subdomain_size ) THEN |
---|
685 | DEALLOCATE( tend ) |
---|
686 | ALLOCATE( tend(nzb:nzt+1,nysg:nyng,nxlg:nxrg) ) |
---|
687 | ENDIF |
---|
688 | |
---|
689 | ! |
---|
690 | !-- Restore perturbation pressure on tend because this array is used |
---|
691 | !-- further below to correct the velocity fields |
---|
692 | DO i = nxl-1, nxr+1 |
---|
693 | DO j = nys-1, nyn+1 |
---|
694 | DO k = nzb, nzt+1 |
---|
695 | tend(k,j,i) = p_loc(k,j,i) |
---|
696 | ENDDO |
---|
697 | ENDDO |
---|
698 | ENDDO |
---|
699 | |
---|
700 | ENDIF |
---|
701 | |
---|
702 | ! |
---|
703 | !-- Store perturbation pressure on array p, used for pressure data output. |
---|
704 | !-- Ghost layers are added in the output routines (except sor-method: see below) |
---|
705 | IF ( intermediate_timestep_count <= 1 ) THEN |
---|
706 | !$OMP PARALLEL PRIVATE (i,j,k) |
---|
707 | !$OMP DO |
---|
708 | !$ACC PARALLEL LOOP COLLAPSE(3) PRIVATE(i, j, k) & |
---|
709 | !$ACC PRESENT(p, tend) |
---|
710 | DO i = nxl-1, nxr+1 |
---|
711 | DO j = nys-1, nyn+1 |
---|
712 | DO k = nzb, nzt+1 |
---|
713 | p(k,j,i) = tend(k,j,i) * & |
---|
714 | weight_substep_l |
---|
715 | ENDDO |
---|
716 | ENDDO |
---|
717 | ENDDO |
---|
718 | !$OMP END PARALLEL |
---|
719 | |
---|
720 | ELSEIF ( intermediate_timestep_count > 1 ) THEN |
---|
721 | !$OMP PARALLEL PRIVATE (i,j,k) |
---|
722 | !$OMP DO |
---|
723 | !$ACC PARALLEL LOOP COLLAPSE(3) PRIVATE(i, j, k) & |
---|
724 | !$ACC PRESENT(p, tend) |
---|
725 | DO i = nxl-1, nxr+1 |
---|
726 | DO j = nys-1, nyn+1 |
---|
727 | DO k = nzb, nzt+1 |
---|
728 | p(k,j,i) = p(k,j,i) + tend(k,j,i) * & |
---|
729 | weight_substep_l |
---|
730 | ENDDO |
---|
731 | ENDDO |
---|
732 | ENDDO |
---|
733 | !$OMP END PARALLEL |
---|
734 | |
---|
735 | ENDIF |
---|
736 | |
---|
737 | ! |
---|
738 | !-- SOR-method needs ghost layers for the next timestep |
---|
739 | IF ( psolver == 'sor' ) CALL exchange_horiz( p, nbgp ) |
---|
740 | |
---|
741 | ! |
---|
742 | !-- Correction of the provisional velocities with the current perturbation |
---|
743 | !-- pressure just computed |
---|
744 | IF ( conserve_volume_flow .AND. ( bc_lr_cyc .OR. bc_ns_cyc ) ) THEN |
---|
745 | volume_flow_l(1) = 0.0_wp |
---|
746 | volume_flow_l(2) = 0.0_wp |
---|
747 | ENDIF |
---|
748 | ! |
---|
749 | !-- Add pressure gradients to the velocity components. Note, the loops are |
---|
750 | !-- running over the entire model domain, even though, in case of non-cyclic |
---|
751 | !-- boundaries u- and v-component are not prognostic at i=0 and j=0, |
---|
752 | !-- respectiveley. However, in case of Dirichlet boundary conditions for the |
---|
753 | !-- velocities, zero-gradient conditions for the pressure are set, so that |
---|
754 | !-- no modification is imposed at the boundaries. |
---|
755 | !$OMP PARALLEL PRIVATE (i,j,k) |
---|
756 | !$OMP DO |
---|
757 | !$ACC PARALLEL LOOP COLLAPSE(2) PRIVATE(i, j, k) & |
---|
758 | !$ACC PRESENT(u, v, w, tend, ddzu, wall_flags_0) |
---|
759 | DO i = nxl, nxr |
---|
760 | DO j = nys, nyn |
---|
761 | |
---|
762 | DO k = nzb+1, nzt |
---|
763 | w(k,j,i) = w(k,j,i) - dt_3d * & |
---|
764 | ( tend(k+1,j,i) - tend(k,j,i) ) * ddzu(k+1) & |
---|
765 | * weight_pres_l & |
---|
766 | * MERGE( 1.0_wp, 0.0_wp, & |
---|
767 | BTEST( wall_flags_0(k,j,i), 3 ) & |
---|
768 | ) |
---|
769 | ENDDO |
---|
770 | |
---|
771 | DO k = nzb+1, nzt |
---|
772 | u(k,j,i) = u(k,j,i) - dt_3d * & |
---|
773 | ( tend(k,j,i) - tend(k,j,i-1) ) * ddx & |
---|
774 | * weight_pres_l & |
---|
775 | * MERGE( 1.0_wp, 0.0_wp, & |
---|
776 | BTEST( wall_flags_0(k,j,i), 1 ) & |
---|
777 | ) |
---|
778 | ENDDO |
---|
779 | |
---|
780 | DO k = nzb+1, nzt |
---|
781 | v(k,j,i) = v(k,j,i) - dt_3d * & |
---|
782 | ( tend(k,j,i) - tend(k,j-1,i) ) * ddy & |
---|
783 | * weight_pres_l & |
---|
784 | * MERGE( 1.0_wp, 0.0_wp, & |
---|
785 | BTEST( wall_flags_0(k,j,i), 2 ) & |
---|
786 | ) |
---|
787 | ENDDO |
---|
788 | |
---|
789 | ENDDO |
---|
790 | ENDDO |
---|
791 | !$OMP END PARALLEL |
---|
792 | |
---|
793 | ! |
---|
794 | !-- The vertical velocity is not set to zero at nzt + 1 for nested domains |
---|
795 | !-- Instead it is set to the values of nzt (see routine vnest_boundary_conds |
---|
796 | !-- or pmci_interp_tril_t) BEFORE calling the pressure solver. To avoid jumps |
---|
797 | !-- while plotting profiles w at the top has to be set to the values in the |
---|
798 | !-- height nzt after above modifications. Hint: w level nzt+1 does not impact |
---|
799 | !-- results. |
---|
800 | IF ( child_domain .OR. coupling_mode == 'vnested_fine' ) THEN |
---|
801 | w(nzt+1,:,:) = w(nzt,:,:) |
---|
802 | ENDIF |
---|
803 | |
---|
804 | ! |
---|
805 | !-- Sum up the volume flow through the right and north boundary |
---|
806 | IF ( conserve_volume_flow .AND. bc_lr_cyc .AND. bc_ns_cyc .AND. & |
---|
807 | nxr == nx ) THEN |
---|
808 | |
---|
809 | !$OMP PARALLEL PRIVATE (j,k) |
---|
810 | !$OMP DO |
---|
811 | DO j = nys, nyn |
---|
812 | !$OMP CRITICAL |
---|
813 | DO k = nzb+1, nzt |
---|
814 | volume_flow_l(1) = volume_flow_l(1) + u(k,j,nxr) * dzw(k) & |
---|
815 | * MERGE( 1.0_wp, 0.0_wp, & |
---|
816 | BTEST( wall_flags_0(k,j,nxr), 1 )& |
---|
817 | ) |
---|
818 | ENDDO |
---|
819 | !$OMP END CRITICAL |
---|
820 | ENDDO |
---|
821 | !$OMP END PARALLEL |
---|
822 | |
---|
823 | ENDIF |
---|
824 | |
---|
825 | IF ( conserve_volume_flow .AND. bc_ns_cyc .AND. bc_lr_cyc .AND. & |
---|
826 | nyn == ny ) THEN |
---|
827 | |
---|
828 | !$OMP PARALLEL PRIVATE (i,k) |
---|
829 | !$OMP DO |
---|
830 | DO i = nxl, nxr |
---|
831 | !$OMP CRITICAL |
---|
832 | DO k = nzb+1, nzt |
---|
833 | volume_flow_l(2) = volume_flow_l(2) + v(k,nyn,i) * dzw(k) & |
---|
834 | * MERGE( 1.0_wp, 0.0_wp, & |
---|
835 | BTEST( wall_flags_0(k,nyn,i), 2 )& |
---|
836 | ) |
---|
837 | ENDDO |
---|
838 | !$OMP END CRITICAL |
---|
839 | ENDDO |
---|
840 | !$OMP END PARALLEL |
---|
841 | |
---|
842 | ENDIF |
---|
843 | |
---|
844 | ! |
---|
845 | !-- Conserve the volume flow |
---|
846 | IF ( conserve_volume_flow .AND. ( bc_lr_cyc .AND. bc_ns_cyc ) ) THEN |
---|
847 | |
---|
848 | #if defined( __parallel ) |
---|
849 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
---|
850 | CALL MPI_ALLREDUCE( volume_flow_l(1), volume_flow(1), 2, MPI_REAL, & |
---|
851 | MPI_SUM, comm2d, ierr ) |
---|
852 | #else |
---|
853 | volume_flow = volume_flow_l |
---|
854 | #endif |
---|
855 | |
---|
856 | volume_flow_offset(1:2) = ( volume_flow_initial(1:2) - volume_flow(1:2) ) / & |
---|
857 | volume_flow_area(1:2) |
---|
858 | |
---|
859 | !$OMP PARALLEL PRIVATE (i,j,k) |
---|
860 | !$OMP DO |
---|
861 | DO i = nxl, nxr |
---|
862 | DO j = nys, nyn |
---|
863 | DO k = nzb+1, nzt |
---|
864 | u(k,j,i) = u(k,j,i) + volume_flow_offset(1) & |
---|
865 | * MERGE( 1.0_wp, 0.0_wp, & |
---|
866 | BTEST( wall_flags_0(k,j,i), 1 ) & |
---|
867 | ) |
---|
868 | ENDDO |
---|
869 | DO k = nzb+1, nzt |
---|
870 | v(k,j,i) = v(k,j,i) + volume_flow_offset(2) & |
---|
871 | * MERGE( 1.0_wp, 0.0_wp, & |
---|
872 | BTEST( wall_flags_0(k,j,i), 2 ) & |
---|
873 | ) |
---|
874 | ENDDO |
---|
875 | ENDDO |
---|
876 | ENDDO |
---|
877 | |
---|
878 | !$OMP END PARALLEL |
---|
879 | |
---|
880 | ENDIF |
---|
881 | |
---|
882 | ! |
---|
883 | !-- Exchange of boundaries for the velocities |
---|
884 | CALL exchange_horiz( u, nbgp ) |
---|
885 | CALL exchange_horiz( v, nbgp ) |
---|
886 | CALL exchange_horiz( w, nbgp ) |
---|
887 | |
---|
888 | ! |
---|
889 | !-- Compute the divergence of the corrected velocity field, |
---|
890 | !-- A possible PE-sum is computed in flow_statistics. Carry out computation |
---|
891 | !-- only at last Runge-Kutta step. |
---|
892 | IF ( intermediate_timestep_count == intermediate_timestep_count_max .OR. & |
---|
893 | intermediate_timestep_count == 0 ) THEN |
---|
894 | CALL cpu_log( log_point_s(1), 'divergence', 'start' ) |
---|
895 | sums_divnew_l = 0.0_wp |
---|
896 | |
---|
897 | ! |
---|
898 | !-- d must be reset to zero because it can contain nonzero values below the |
---|
899 | !-- topography |
---|
900 | IF ( topography /= 'flat' ) d = 0.0_wp |
---|
901 | |
---|
902 | localsum = 0.0_wp |
---|
903 | threadsum = 0.0_wp |
---|
904 | |
---|
905 | !$OMP PARALLEL PRIVATE (i,j,k) FIRSTPRIVATE(threadsum) REDUCTION(+:localsum) |
---|
906 | #if defined( __ibm ) |
---|
907 | !$OMP DO SCHEDULE( STATIC ) |
---|
908 | DO i = nxl, nxr |
---|
909 | DO j = nys, nyn |
---|
910 | DO k = nzb+1, nzt |
---|
911 | d(k,j,i) = ( ( u(k,j,i+1) - u(k,j,i) ) * rho_air(k) * ddx + & |
---|
912 | ( v(k,j+1,i) - v(k,j,i) ) * rho_air(k) * ddy + & |
---|
913 | ( w(k,j,i) * rho_air_zw(k) - & |
---|
914 | w(k-1,j,i) * rho_air_zw(k-1) ) * ddzw(k) & |
---|
915 | ) * MERGE( 1.0_wp, 0.0_wp, & |
---|
916 | BTEST( wall_flags_0(k,j,i), 0 ) & |
---|
917 | ) |
---|
918 | ENDDO |
---|
919 | DO k = nzb+1, nzt |
---|
920 | threadsum = threadsum + ABS( d(k,j,i) ) |
---|
921 | ENDDO |
---|
922 | ENDDO |
---|
923 | ENDDO |
---|
924 | #else |
---|
925 | !$OMP DO SCHEDULE( STATIC ) |
---|
926 | !$ACC PARALLEL LOOP COLLAPSE(3) PRIVATE(i, j, k) & |
---|
927 | !$ACC PRESENT(u, v, w, rho_air, rho_air_zw, ddzw, wall_flags_0) & |
---|
928 | !$ACC PRESENT(d) |
---|
929 | DO i = nxl, nxr |
---|
930 | DO j = nys, nyn |
---|
931 | DO k = nzb+1, nzt |
---|
932 | d(k,j,i) = ( ( u(k,j,i+1) - u(k,j,i) ) * rho_air(k) * ddx + & |
---|
933 | ( v(k,j+1,i) - v(k,j,i) ) * rho_air(k) * ddy + & |
---|
934 | ( w(k,j,i) * rho_air_zw(k) - & |
---|
935 | w(k-1,j,i) * rho_air_zw(k-1) ) * ddzw(k) & |
---|
936 | ) * MERGE( 1.0_wp, 0.0_wp, & |
---|
937 | BTEST( wall_flags_0(k,j,i), 0 ) & |
---|
938 | ) |
---|
939 | ENDDO |
---|
940 | ENDDO |
---|
941 | ENDDO |
---|
942 | ! |
---|
943 | !-- Compute possible PE-sum of divergences for flow_statistics |
---|
944 | !$OMP DO SCHEDULE( STATIC ) |
---|
945 | !$ACC PARALLEL LOOP COLLAPSE(3) PRIVATE(i, j, k) & |
---|
946 | !$ACC REDUCTION(+:threadsum) COPY(threadsum) & |
---|
947 | !$ACC PRESENT(d) |
---|
948 | DO i = nxl, nxr |
---|
949 | DO j = nys, nyn |
---|
950 | DO k = nzb+1, nzt |
---|
951 | threadsum = threadsum + ABS( d(k,j,i) ) |
---|
952 | ENDDO |
---|
953 | ENDDO |
---|
954 | ENDDO |
---|
955 | #endif |
---|
956 | |
---|
957 | localsum = localsum + threadsum |
---|
958 | !$OMP END PARALLEL |
---|
959 | |
---|
960 | ! |
---|
961 | !-- For completeness, set the divergence sum of all statistic regions to those |
---|
962 | !-- of the total domain |
---|
963 | sums_divnew_l(0:statistic_regions) = localsum |
---|
964 | |
---|
965 | CALL cpu_log( log_point_s(1), 'divergence', 'stop' ) |
---|
966 | |
---|
967 | ENDIF |
---|
968 | |
---|
969 | CALL cpu_log( log_point(8), 'pres', 'stop' ) |
---|
970 | |
---|
971 | END SUBROUTINE pres |
---|