1 | !> @file pres.f90 |
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2 | !------------------------------------------------------------------------------! |
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3 | ! This file is part of PALM. |
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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 1997-2016 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 2001 2016-08-20 18:41:22Z suehring $ |
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27 | ! |
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28 | ! 2000 2016-08-20 18:09:15Z knoop |
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29 | ! Forced header and separation lines into 80 columns |
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30 | ! |
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31 | ! 1932 2016-06-10 12:09:21Z suehring |
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32 | ! Initial version of purely vertical nesting introduced. |
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33 | ! |
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34 | ! 1931 2016-06-10 12:06:59Z suehring |
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35 | ! Rename multigrid into multigrid_noopt and multigrid_fast into multigrid |
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36 | ! |
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37 | ! 1929 2016-06-09 16:25:25Z suehring |
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38 | ! Bugfix: weight_substep for initial call, replace by local variable |
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39 | ! |
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40 | ! 1918 2016-05-27 14:35:57Z raasch |
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41 | ! sum of divergence is also calculated when pres is called before the initial |
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42 | ! first time step, |
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43 | ! stearing is modified by using intermediate_timestep_count = 0 in order to |
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44 | ! determine if pres is called before the first initial timestep, |
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45 | ! bugfix: in case of Neumann conditions for pressure both at bottom and top, |
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46 | ! mean vertical velocity is also removed for the first time step |
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47 | ! bugfix for calculating divergences |
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48 | ! |
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49 | ! 1908 2016-05-25 17:22:32Z suehring |
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50 | ! New divergence for output into RUN_CONTROL file is calculated only at last |
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51 | ! Runge-Kutta step |
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52 | ! |
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53 | ! 1845 2016-04-08 08:29:13Z raasch |
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54 | ! nzb_2d replace by nzb_u|v_inner |
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55 | ! |
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56 | ! 1799 2016-04-05 08:35:55Z gronemeier |
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57 | ! Bugfix: excluded third dimension from horizontal volume flow calculation |
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58 | ! |
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59 | ! 1762 2016-02-25 12:31:13Z hellstea |
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60 | ! Introduction of nested domain feature |
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61 | ! |
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62 | ! 1682 2015-10-07 23:56:08Z knoop |
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63 | ! Code annotations made doxygen readable |
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64 | ! |
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65 | ! 1575 2015-03-27 09:56:27Z raasch |
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66 | ! poismg_fast + respective module added, adjustments for psolver-queries |
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67 | ! |
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68 | ! 1342 2014-03-26 17:04:47Z kanani |
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69 | ! REAL constants defined as wp-kind |
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70 | ! |
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71 | ! 1320 2014-03-20 08:40:49Z raasch |
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72 | ! ONLY-attribute added to USE-statements, |
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73 | ! kind-parameters added to all INTEGER and REAL declaration statements, |
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74 | ! kinds are defined in new module kinds, |
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75 | ! old module precision_kind is removed, |
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76 | ! revision history before 2012 removed, |
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77 | ! comment fields (!:) to be used for variable explanations added to |
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78 | ! all variable declaration statements |
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79 | ! |
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80 | ! 1318 2014-03-17 13:35:16Z raasch |
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81 | ! module interfaces removed |
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82 | ! |
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83 | ! 1306 2014-03-13 14:30:59Z raasch |
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84 | ! second argument removed from routine poisfft |
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85 | ! |
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86 | ! 1257 2013-11-08 15:18:40Z raasch |
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87 | ! openacc loop and loop vector clauses removed, independent clauses added, |
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88 | ! end parallel replaced by end parallel loop |
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89 | ! |
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90 | ! 1221 2013-09-10 08:59:13Z raasch |
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91 | ! openACC porting of reduction operations, loops for calculating d are |
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92 | ! using the rflags_s_inner multiply flag instead of the nzb_s_inner loop index |
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93 | ! |
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94 | ! 1212 2013-08-15 08:46:27Z raasch |
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95 | ! call of poisfft_hybrid removed |
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96 | ! |
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97 | ! 1117 2013-03-27 11:15:36Z suehring |
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98 | ! Bugfix in OpenMP parallelization. |
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99 | ! |
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100 | ! 1113 2013-03-10 02:48:14Z raasch |
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101 | ! GPU-porting of several loops, some loops rearranged |
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102 | ! |
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103 | ! 1111 2013-03-08 23:54:10Z |
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104 | ! openACC statements added, |
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105 | ! ibc_p_b = 2 removed |
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106 | ! |
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107 | ! 1092 2013-02-02 11:24:22Z raasch |
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108 | ! unused variables removed |
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109 | ! |
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110 | ! 1036 2012-10-22 13:43:42Z raasch |
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111 | ! code put under GPL (PALM 3.9) |
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112 | ! |
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113 | ! 1003 2012-09-14 14:35:53Z raasch |
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114 | ! adjustment of array tend for cases with unequal subdomain sizes removed |
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115 | ! |
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116 | ! Revision 1.1 1997/07/24 11:24:44 raasch |
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117 | ! Initial revision |
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118 | ! |
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119 | ! |
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120 | ! Description: |
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121 | ! ------------ |
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122 | !> Compute the divergence of the provisional velocity field. Solve the Poisson |
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123 | !> equation for the perturbation pressure. Compute the final velocities using |
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124 | !> this perturbation pressure. Compute the remaining divergence. |
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125 | !------------------------------------------------------------------------------! |
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126 | SUBROUTINE pres |
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127 | |
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128 | |
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129 | USE arrays_3d, & |
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130 | ONLY: d, ddzu, ddzu_pres, ddzw, dzw, p, p_loc, tend, u, v, w |
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131 | |
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132 | USE control_parameters, & |
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133 | ONLY: bc_lr_cyc, bc_ns_cyc, conserve_volume_flow, dt_3d, & |
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134 | gathered_size, ibc_p_b, ibc_p_t, intermediate_timestep_count, & |
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135 | intermediate_timestep_count_max, mg_switch_to_pe0_level, & |
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136 | nest_domain, on_device, outflow_l, outflow_n, outflow_r, & |
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137 | outflow_s, psolver, subdomain_size, topography, volume_flow, & |
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138 | volume_flow_area, volume_flow_initial |
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139 | |
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140 | USE cpulog, & |
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141 | ONLY: cpu_log, log_point, log_point_s |
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142 | |
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143 | USE grid_variables, & |
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144 | ONLY: ddx, ddy |
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145 | |
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146 | USE indices, & |
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147 | ONLY: nbgp, ngp_2dh_outer, nx, nxl, nxlg, nxl_mg, nxr, nxrg, nxr_mg, & |
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148 | ny, nys, nysg, nys_mg, nyn, nyng, nyn_mg, nzb, nzb_s_inner, & |
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149 | nzb_u_inner, nzb_v_inner, nzb_w_inner, nzt, nzt_mg, & |
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150 | rflags_s_inner |
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151 | |
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152 | USE kinds |
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153 | |
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154 | USE pegrid |
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155 | |
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156 | USE pmc_interface, & |
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157 | ONLY: nesting_mode |
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158 | |
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159 | USE poisfft_mod, & |
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160 | ONLY: poisfft |
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161 | |
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162 | USE poismg_mod |
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163 | |
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164 | USE statistics, & |
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165 | ONLY: statistic_regions, sums_divnew_l, sums_divold_l, weight_pres, & |
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166 | weight_substep |
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167 | |
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168 | IMPLICIT NONE |
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169 | |
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170 | INTEGER(iwp) :: i !< |
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171 | INTEGER(iwp) :: j !< |
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172 | INTEGER(iwp) :: k !< |
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173 | |
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174 | REAL(wp) :: ddt_3d !< |
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175 | REAL(wp) :: d_weight_pres !< |
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176 | REAL(wp) :: localsum !< |
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177 | REAL(wp) :: threadsum !< |
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178 | REAL(wp) :: weight_pres_l !< |
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179 | REAL(wp) :: weight_substep_l !< |
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180 | |
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181 | REAL(wp), DIMENSION(1:3) :: volume_flow_l !< |
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182 | REAL(wp), DIMENSION(1:3) :: volume_flow_offset !< |
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183 | REAL(wp), DIMENSION(1:nzt) :: w_l !< |
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184 | REAL(wp), DIMENSION(1:nzt) :: w_l_l !< |
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185 | |
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186 | LOGICAL :: nest_domain_nvn !< |
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187 | |
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188 | |
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189 | CALL cpu_log( log_point(8), 'pres', 'start' ) |
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190 | |
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191 | |
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192 | ! |
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193 | !-- Calculate quantities to be used locally |
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194 | ddt_3d = 1.0_wp / dt_3d |
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195 | IF ( intermediate_timestep_count == 0 ) THEN |
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196 | ! |
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197 | !-- If pres is called before initial time step |
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198 | weight_pres_l = 1.0_wp |
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199 | d_weight_pres = 1.0_wp |
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200 | weight_substep_l = 1.0_wp |
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201 | ELSE |
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202 | weight_pres_l = weight_pres(intermediate_timestep_count) |
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203 | d_weight_pres = 1.0_wp / weight_pres(intermediate_timestep_count) |
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204 | weight_substep_l = weight_substep(intermediate_timestep_count) |
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205 | ENDIF |
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206 | |
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207 | ! |
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208 | !-- Multigrid method expects array d to have one ghost layer. |
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209 | !-- |
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210 | IF ( psolver(1:9) == 'multigrid' ) THEN |
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211 | |
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212 | DEALLOCATE( d ) |
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213 | ALLOCATE( d(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1) ) |
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214 | |
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215 | ! |
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216 | !-- Since p is later used to hold the weighted average of the substeps, it |
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217 | !-- cannot be used in the iterative solver. Therefore, its initial value is |
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218 | !-- stored on p_loc, which is then iteratively advanced in every substep. |
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219 | IF ( intermediate_timestep_count <= 1 ) THEN |
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220 | DO i = nxl-1, nxr+1 |
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221 | DO j = nys-1, nyn+1 |
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222 | DO k = nzb, nzt+1 |
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223 | p_loc(k,j,i) = p(k,j,i) |
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224 | ENDDO |
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225 | ENDDO |
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226 | ENDDO |
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227 | ENDIF |
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228 | |
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229 | ELSEIF ( psolver == 'sor' .AND. intermediate_timestep_count <= 1 ) THEN |
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230 | |
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231 | ! |
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232 | !-- Since p is later used to hold the weighted average of the substeps, it |
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233 | !-- cannot be used in the iterative solver. Therefore, its initial value is |
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234 | !-- stored on p_loc, which is then iteratively advanced in every substep. |
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235 | p_loc = p |
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236 | |
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237 | ENDIF |
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238 | |
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239 | ! |
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240 | !-- Conserve the volume flow at the outflow in case of non-cyclic lateral |
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241 | !-- boundary conditions |
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242 | !-- WARNING: so far, this conservation does not work at the left/south |
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243 | !-- boundary if the topography at the inflow differs from that at the |
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244 | !-- outflow! For this case, volume_flow_area needs adjustment! |
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245 | ! |
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246 | !-- Left/right |
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247 | IF ( conserve_volume_flow .AND. ( outflow_l .OR. outflow_r ) ) THEN |
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248 | |
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249 | volume_flow(1) = 0.0_wp |
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250 | volume_flow_l(1) = 0.0_wp |
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251 | |
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252 | IF ( outflow_l ) THEN |
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253 | i = 0 |
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254 | ELSEIF ( outflow_r ) THEN |
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255 | i = nx+1 |
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256 | ENDIF |
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257 | |
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258 | DO j = nys, nyn |
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259 | ! |
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260 | !-- Sum up the volume flow through the south/north boundary |
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261 | DO k = nzb_u_inner(j,i)+1, nzt |
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262 | volume_flow_l(1) = volume_flow_l(1) + u(k,j,i) * dzw(k) |
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263 | ENDDO |
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264 | ENDDO |
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265 | |
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266 | #if defined( __parallel ) |
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267 | IF ( collective_wait ) CALL MPI_BARRIER( comm1dy, ierr ) |
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268 | CALL MPI_ALLREDUCE( volume_flow_l(1), volume_flow(1), 1, MPI_REAL, & |
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269 | MPI_SUM, comm1dy, ierr ) |
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270 | #else |
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271 | volume_flow = volume_flow_l |
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272 | #endif |
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273 | volume_flow_offset(1) = ( volume_flow_initial(1) - volume_flow(1) ) & |
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274 | / volume_flow_area(1) |
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275 | |
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276 | DO j = nysg, nyng |
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277 | DO k = nzb_u_inner(j,i)+1, nzt |
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278 | u(k,j,i) = u(k,j,i) + volume_flow_offset(1) |
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279 | ENDDO |
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280 | ENDDO |
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281 | |
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282 | ENDIF |
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283 | |
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284 | ! |
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285 | !-- South/north |
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286 | IF ( conserve_volume_flow .AND. ( outflow_n .OR. outflow_s ) ) THEN |
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287 | |
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288 | volume_flow(2) = 0.0_wp |
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289 | volume_flow_l(2) = 0.0_wp |
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290 | |
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291 | IF ( outflow_s ) THEN |
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292 | j = 0 |
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293 | ELSEIF ( outflow_n ) THEN |
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294 | j = ny+1 |
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295 | ENDIF |
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296 | |
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297 | DO i = nxl, nxr |
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298 | ! |
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299 | !-- Sum up the volume flow through the south/north boundary |
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300 | DO k = nzb_v_inner(j,i)+1, nzt |
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301 | volume_flow_l(2) = volume_flow_l(2) + v(k,j,i) * dzw(k) |
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302 | ENDDO |
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303 | ENDDO |
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304 | |
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305 | #if defined( __parallel ) |
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306 | IF ( collective_wait ) CALL MPI_BARRIER( comm1dx, ierr ) |
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307 | CALL MPI_ALLREDUCE( volume_flow_l(2), volume_flow(2), 1, MPI_REAL, & |
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308 | MPI_SUM, comm1dx, ierr ) |
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309 | #else |
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310 | volume_flow = volume_flow_l |
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311 | #endif |
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312 | volume_flow_offset(2) = ( volume_flow_initial(2) - volume_flow(2) ) & |
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313 | / volume_flow_area(2) |
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314 | |
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315 | DO i = nxlg, nxrg |
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316 | DO k = nzb_v_inner(j,i)+1, nzt |
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317 | v(k,j,i) = v(k,j,i) + volume_flow_offset(2) |
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318 | ENDDO |
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319 | ENDDO |
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320 | |
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321 | ENDIF |
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322 | |
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323 | ! |
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324 | !-- Remove mean vertical velocity in case that Neumann conditions are |
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325 | !-- used both at bottom and top boundary, and if not a nested domain in a |
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326 | !-- normal nesting run. In case of vertical nesting, this must be done. |
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327 | !-- Therefore an auxiliary logical variable nest_domain_nvn is used here, and |
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328 | !-- nvn stands for non-vertical nesting. |
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329 | !-- This cannot be done before the first initial time step because ngp_2dh_outer |
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330 | !-- is not yet known then. |
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331 | nest_domain_nvn = nest_domain |
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332 | IF ( nest_domain .AND. nesting_mode == 'vertical' ) THEN |
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333 | nest_domain_nvn = .FALSE. |
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334 | ENDIF |
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335 | |
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336 | IF ( ibc_p_b == 1 .AND. ibc_p_t == 1 .AND. & |
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337 | .NOT. nest_domain_nvn .AND. intermediate_timestep_count /= 0 ) & |
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338 | THEN |
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339 | w_l = 0.0_wp; w_l_l = 0.0_wp |
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340 | DO i = nxl, nxr |
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341 | DO j = nys, nyn |
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342 | DO k = nzb_w_inner(j,i)+1, nzt |
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343 | w_l_l(k) = w_l_l(k) + w(k,j,i) |
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344 | ENDDO |
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345 | ENDDO |
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346 | ENDDO |
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347 | #if defined( __parallel ) |
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348 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
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349 | CALL MPI_ALLREDUCE( w_l_l(1), w_l(1), nzt, MPI_REAL, MPI_SUM, & |
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350 | comm2d, ierr ) |
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351 | #else |
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352 | w_l = w_l_l |
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353 | #endif |
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354 | DO k = 1, nzt |
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355 | w_l(k) = w_l(k) / ngp_2dh_outer(k,0) |
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356 | ENDDO |
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357 | DO i = nxlg, nxrg |
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358 | DO j = nysg, nyng |
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359 | DO k = nzb_w_inner(j,i)+1, nzt |
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360 | w(k,j,i) = w(k,j,i) - w_l(k) |
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361 | ENDDO |
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362 | ENDDO |
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363 | ENDDO |
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364 | ENDIF |
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365 | |
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366 | ! |
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367 | !-- Compute the divergence of the provisional velocity field. |
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368 | CALL cpu_log( log_point_s(1), 'divergence', 'start' ) |
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369 | |
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370 | IF ( psolver(1:9) == 'multigrid' ) THEN |
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371 | !$OMP PARALLEL DO SCHEDULE( STATIC ) |
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372 | DO i = nxl-1, nxr+1 |
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373 | DO j = nys-1, nyn+1 |
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374 | DO k = nzb, nzt+1 |
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375 | d(k,j,i) = 0.0_wp |
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376 | ENDDO |
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377 | ENDDO |
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378 | ENDDO |
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379 | ELSE |
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380 | !$OMP PARALLEL DO SCHEDULE( STATIC ) |
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381 | !$acc kernels present( d ) |
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382 | DO i = nxl, nxr |
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383 | DO j = nys, nyn |
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384 | DO k = nzb+1, nzt |
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385 | d(k,j,i) = 0.0_wp |
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386 | ENDDO |
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387 | ENDDO |
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388 | ENDDO |
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389 | !$acc end kernels |
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390 | ENDIF |
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391 | |
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392 | localsum = 0.0_wp |
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393 | threadsum = 0.0_wp |
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394 | |
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395 | #if defined( __ibm ) |
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396 | !$OMP PARALLEL PRIVATE (i,j,k) FIRSTPRIVATE(threadsum) REDUCTION(+:localsum) |
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397 | !$OMP DO SCHEDULE( STATIC ) |
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398 | DO i = nxl, nxr |
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399 | DO j = nys, nyn |
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400 | DO k = nzb_s_inner(j,i)+1, nzt |
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401 | d(k,j,i) = ( ( u(k,j,i+1) - u(k,j,i) ) * ddx + & |
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402 | ( v(k,j+1,i) - v(k,j,i) ) * ddy + & |
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403 | ( w(k,j,i) - w(k-1,j,i) ) * ddzw(k) ) * ddt_3d & |
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404 | * d_weight_pres |
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405 | ENDDO |
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406 | ! |
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407 | !-- Compute possible PE-sum of divergences for flow_statistics |
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408 | DO k = nzb_s_inner(j,i)+1, nzt |
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409 | threadsum = threadsum + ABS( d(k,j,i) ) |
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410 | ENDDO |
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411 | |
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412 | ENDDO |
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413 | ENDDO |
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414 | |
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415 | IF ( intermediate_timestep_count == intermediate_timestep_count_max .OR. & |
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416 | intermediate_timestep_count == 0 ) THEN |
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417 | localsum = localsum + threadsum * dt_3d * weight_pres_l |
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418 | ENDIF |
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419 | !$OMP END PARALLEL |
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420 | #else |
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421 | |
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422 | !$OMP PARALLEL PRIVATE (i,j,k) |
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423 | !$OMP DO SCHEDULE( STATIC ) |
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424 | !$acc kernels present( d, ddzw, rflags_s_inner, u, v, w ) |
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425 | !$acc loop collapse( 3 ) |
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426 | DO i = nxl, nxr |
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427 | DO j = nys, nyn |
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428 | DO k = 1, nzt |
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429 | d(k,j,i) = ( ( u(k,j,i+1) - u(k,j,i) ) * ddx + & |
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430 | ( v(k,j+1,i) - v(k,j,i) ) * ddy + & |
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431 | ( w(k,j,i) - w(k-1,j,i) ) * ddzw(k) ) * ddt_3d & |
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432 | * d_weight_pres * rflags_s_inner(k,j,i) |
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433 | ENDDO |
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434 | ENDDO |
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435 | ENDDO |
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436 | !$acc end kernels |
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437 | !$OMP END PARALLEL |
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438 | |
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439 | ! |
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440 | !-- Compute possible PE-sum of divergences for flow_statistics. Carry out |
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441 | !-- computation only at last Runge-Kutta substep. |
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442 | IF ( intermediate_timestep_count == intermediate_timestep_count_max .OR. & |
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443 | intermediate_timestep_count == 0 ) THEN |
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444 | !$OMP PARALLEL PRIVATE (i,j,k) FIRSTPRIVATE(threadsum) REDUCTION(+:localsum) |
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445 | !$OMP DO SCHEDULE( STATIC ) |
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446 | !$acc parallel loop collapse(3) present( d ) reduction(+:threadsum) |
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447 | DO i = nxl, nxr |
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448 | DO j = nys, nyn |
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449 | DO k = nzb+1, nzt |
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450 | threadsum = threadsum + ABS( d(k,j,i) ) |
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451 | ENDDO |
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452 | ENDDO |
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453 | ENDDO |
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454 | !$acc end parallel loop |
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455 | localsum = localsum + threadsum * dt_3d * weight_pres_l |
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456 | !$OMP END PARALLEL |
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457 | ENDIF |
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458 | #endif |
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459 | |
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460 | ! |
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461 | !-- For completeness, set the divergence sum of all statistic regions to those |
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462 | !-- of the total domain |
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463 | IF ( intermediate_timestep_count == intermediate_timestep_count_max .OR. & |
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464 | intermediate_timestep_count == 0 ) THEN |
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465 | sums_divold_l(0:statistic_regions) = localsum |
---|
466 | ENDIF |
---|
467 | |
---|
468 | CALL cpu_log( log_point_s(1), 'divergence', 'stop' ) |
---|
469 | |
---|
470 | ! |
---|
471 | !-- Compute the pressure perturbation solving the Poisson equation |
---|
472 | IF ( psolver == 'poisfft' ) THEN |
---|
473 | |
---|
474 | ! |
---|
475 | !-- Solve Poisson equation via FFT and solution of tridiagonal matrices |
---|
476 | CALL poisfft( d ) |
---|
477 | |
---|
478 | ! |
---|
479 | !-- Store computed perturbation pressure and set boundary condition in |
---|
480 | !-- z-direction |
---|
481 | !$OMP PARALLEL DO |
---|
482 | !$acc kernels present( d, tend ) |
---|
483 | DO i = nxl, nxr |
---|
484 | DO j = nys, nyn |
---|
485 | DO k = nzb+1, nzt |
---|
486 | tend(k,j,i) = d(k,j,i) |
---|
487 | ENDDO |
---|
488 | ENDDO |
---|
489 | ENDDO |
---|
490 | !$acc end kernels |
---|
491 | |
---|
492 | ! |
---|
493 | !-- Bottom boundary: |
---|
494 | !-- This condition is only required for internal output. The pressure |
---|
495 | !-- gradient (dp(nzb+1)-dp(nzb))/dz is not used anywhere else. |
---|
496 | IF ( ibc_p_b == 1 ) THEN |
---|
497 | ! |
---|
498 | !-- Neumann (dp/dz = 0) |
---|
499 | !$OMP PARALLEL DO |
---|
500 | !$acc kernels present( nzb_s_inner, tend ) |
---|
501 | DO i = nxlg, nxrg |
---|
502 | DO j = nysg, nyng |
---|
503 | tend(nzb_s_inner(j,i),j,i) = tend(nzb_s_inner(j,i)+1,j,i) |
---|
504 | ENDDO |
---|
505 | ENDDO |
---|
506 | !$acc end kernels |
---|
507 | |
---|
508 | ELSE |
---|
509 | ! |
---|
510 | !-- Dirichlet |
---|
511 | !$OMP PARALLEL DO |
---|
512 | !$acc kernels present( tend ) |
---|
513 | DO i = nxlg, nxrg |
---|
514 | DO j = nysg, nyng |
---|
515 | tend(nzb_s_inner(j,i),j,i) = 0.0_wp |
---|
516 | ENDDO |
---|
517 | ENDDO |
---|
518 | !$acc end kernels |
---|
519 | |
---|
520 | ENDIF |
---|
521 | |
---|
522 | ! |
---|
523 | !-- Top boundary |
---|
524 | IF ( ibc_p_t == 1 ) THEN |
---|
525 | ! |
---|
526 | !-- Neumann |
---|
527 | !$OMP PARALLEL DO |
---|
528 | !$acc kernels present( tend ) |
---|
529 | DO i = nxlg, nxrg |
---|
530 | DO j = nysg, nyng |
---|
531 | tend(nzt+1,j,i) = tend(nzt,j,i) |
---|
532 | ENDDO |
---|
533 | ENDDO |
---|
534 | !$acc end kernels |
---|
535 | |
---|
536 | ELSE |
---|
537 | ! |
---|
538 | !-- Dirichlet |
---|
539 | !$OMP PARALLEL DO |
---|
540 | !$acc kernels present( tend ) |
---|
541 | DO i = nxlg, nxrg |
---|
542 | DO j = nysg, nyng |
---|
543 | tend(nzt+1,j,i) = 0.0_wp |
---|
544 | ENDDO |
---|
545 | ENDDO |
---|
546 | !$acc end kernels |
---|
547 | |
---|
548 | ENDIF |
---|
549 | |
---|
550 | ! |
---|
551 | !-- Exchange boundaries for p |
---|
552 | IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs |
---|
553 | on_device = .TRUE. ! to be removed after complete porting |
---|
554 | ELSE ! of ghost point exchange |
---|
555 | !$acc update host( tend ) |
---|
556 | ENDIF |
---|
557 | CALL exchange_horiz( tend, nbgp ) |
---|
558 | IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs |
---|
559 | on_device = .FALSE. ! to be removed after complete porting |
---|
560 | ELSE ! of ghost point exchange |
---|
561 | !$acc update device( tend ) |
---|
562 | ENDIF |
---|
563 | |
---|
564 | ELSEIF ( psolver == 'sor' ) THEN |
---|
565 | |
---|
566 | ! |
---|
567 | !-- Solve Poisson equation for perturbation pressure using SOR-Red/Black |
---|
568 | !-- scheme |
---|
569 | CALL sor( d, ddzu_pres, ddzw, p_loc ) |
---|
570 | tend = p_loc |
---|
571 | |
---|
572 | ELSEIF ( psolver(1:9) == 'multigrid' ) THEN |
---|
573 | |
---|
574 | ! |
---|
575 | !-- Solve Poisson equation for perturbation pressure using Multigrid scheme, |
---|
576 | !-- array tend is used to store the residuals, logical exchange_mg is used |
---|
577 | !-- to discern data exchange in multigrid ( 1 ghostpoint ) and normal grid |
---|
578 | !-- ( nbgp ghost points ). |
---|
579 | |
---|
580 | !-- If the number of grid points of the gathered grid, which is collected |
---|
581 | !-- on PE0, is larger than the number of grid points of an PE, than array |
---|
582 | !-- tend will be enlarged. |
---|
583 | IF ( gathered_size > subdomain_size ) THEN |
---|
584 | DEALLOCATE( tend ) |
---|
585 | ALLOCATE( tend(nzb:nzt_mg(mg_switch_to_pe0_level)+1,nys_mg( & |
---|
586 | mg_switch_to_pe0_level)-1:nyn_mg(mg_switch_to_pe0_level)+1,& |
---|
587 | nxl_mg(mg_switch_to_pe0_level)-1:nxr_mg( & |
---|
588 | mg_switch_to_pe0_level)+1) ) |
---|
589 | ENDIF |
---|
590 | |
---|
591 | IF ( psolver == 'multigrid' ) THEN |
---|
592 | CALL poismg( tend ) |
---|
593 | ELSE |
---|
594 | CALL poismg_noopt( tend ) |
---|
595 | ENDIF |
---|
596 | |
---|
597 | IF ( gathered_size > subdomain_size ) THEN |
---|
598 | DEALLOCATE( tend ) |
---|
599 | ALLOCATE( tend(nzb:nzt+1,nysg:nyng,nxlg:nxrg) ) |
---|
600 | ENDIF |
---|
601 | |
---|
602 | ! |
---|
603 | !-- Restore perturbation pressure on tend because this array is used |
---|
604 | !-- further below to correct the velocity fields |
---|
605 | DO i = nxl-1, nxr+1 |
---|
606 | DO j = nys-1, nyn+1 |
---|
607 | DO k = nzb, nzt+1 |
---|
608 | tend(k,j,i) = p_loc(k,j,i) |
---|
609 | ENDDO |
---|
610 | ENDDO |
---|
611 | ENDDO |
---|
612 | |
---|
613 | ENDIF |
---|
614 | |
---|
615 | ! |
---|
616 | !-- Store perturbation pressure on array p, used for pressure data output. |
---|
617 | !-- Ghost layers are added in the output routines (except sor-method: see below) |
---|
618 | IF ( intermediate_timestep_count <= 1 ) THEN |
---|
619 | !$OMP PARALLEL PRIVATE (i,j,k) |
---|
620 | !$OMP DO |
---|
621 | !$acc kernels present( p, tend, weight_substep_l ) |
---|
622 | !$acc loop independent |
---|
623 | DO i = nxl-1, nxr+1 |
---|
624 | !$acc loop independent |
---|
625 | DO j = nys-1, nyn+1 |
---|
626 | !$acc loop independent |
---|
627 | DO k = nzb, nzt+1 |
---|
628 | p(k,j,i) = tend(k,j,i) * & |
---|
629 | weight_substep_l |
---|
630 | ENDDO |
---|
631 | ENDDO |
---|
632 | ENDDO |
---|
633 | !$acc end kernels |
---|
634 | !$OMP END PARALLEL |
---|
635 | |
---|
636 | ELSEIF ( intermediate_timestep_count > 1 ) THEN |
---|
637 | !$OMP PARALLEL PRIVATE (i,j,k) |
---|
638 | !$OMP DO |
---|
639 | !$acc kernels present( p, tend, weight_substep_l ) |
---|
640 | !$acc loop independent |
---|
641 | DO i = nxl-1, nxr+1 |
---|
642 | !$acc loop independent |
---|
643 | DO j = nys-1, nyn+1 |
---|
644 | !$acc loop independent |
---|
645 | DO k = nzb, nzt+1 |
---|
646 | p(k,j,i) = p(k,j,i) + tend(k,j,i) * & |
---|
647 | weight_substep_l |
---|
648 | ENDDO |
---|
649 | ENDDO |
---|
650 | ENDDO |
---|
651 | !$acc end kernels |
---|
652 | !$OMP END PARALLEL |
---|
653 | |
---|
654 | ENDIF |
---|
655 | |
---|
656 | ! |
---|
657 | !-- SOR-method needs ghost layers for the next timestep |
---|
658 | IF ( psolver == 'sor' ) CALL exchange_horiz( p, nbgp ) |
---|
659 | |
---|
660 | ! |
---|
661 | !-- Correction of the provisional velocities with the current perturbation |
---|
662 | !-- pressure just computed |
---|
663 | IF ( conserve_volume_flow .AND. ( bc_lr_cyc .OR. bc_ns_cyc ) ) THEN |
---|
664 | volume_flow_l(1) = 0.0_wp |
---|
665 | volume_flow_l(2) = 0.0_wp |
---|
666 | ENDIF |
---|
667 | |
---|
668 | !$OMP PARALLEL PRIVATE (i,j,k) |
---|
669 | !$OMP DO |
---|
670 | !$acc kernels present( ddzu, nzb_u_inner, nzb_v_inner, nzb_w_inner, tend, u, v, w ) |
---|
671 | !$acc loop independent |
---|
672 | DO i = nxl, nxr |
---|
673 | !$acc loop independent |
---|
674 | DO j = nys, nyn |
---|
675 | !$acc loop independent |
---|
676 | DO k = 1, nzt |
---|
677 | IF ( k > nzb_w_inner(j,i) ) THEN |
---|
678 | w(k,j,i) = w(k,j,i) - dt_3d * & |
---|
679 | ( tend(k+1,j,i) - tend(k,j,i) ) * ddzu(k+1) * & |
---|
680 | weight_pres_l |
---|
681 | ENDIF |
---|
682 | ENDDO |
---|
683 | !$acc loop independent |
---|
684 | DO k = 1, nzt |
---|
685 | IF ( k > nzb_u_inner(j,i) ) THEN |
---|
686 | u(k,j,i) = u(k,j,i) - dt_3d * & |
---|
687 | ( tend(k,j,i) - tend(k,j,i-1) ) * ddx * & |
---|
688 | weight_pres_l |
---|
689 | ENDIF |
---|
690 | ENDDO |
---|
691 | !$acc loop independent |
---|
692 | DO k = 1, nzt |
---|
693 | IF ( k > nzb_v_inner(j,i) ) THEN |
---|
694 | v(k,j,i) = v(k,j,i) - dt_3d * & |
---|
695 | ( tend(k,j,i) - tend(k,j-1,i) ) * ddy * & |
---|
696 | weight_pres_l |
---|
697 | ENDIF |
---|
698 | ENDDO |
---|
699 | |
---|
700 | ENDDO |
---|
701 | ENDDO |
---|
702 | !$acc end kernels |
---|
703 | !$OMP END PARALLEL |
---|
704 | |
---|
705 | ! |
---|
706 | !-- Sum up the volume flow through the right and north boundary |
---|
707 | IF ( conserve_volume_flow .AND. bc_lr_cyc .AND. bc_ns_cyc .AND. & |
---|
708 | nxr == nx ) THEN |
---|
709 | |
---|
710 | !$OMP PARALLEL PRIVATE (j,k) |
---|
711 | !$OMP DO |
---|
712 | DO j = nys, nyn |
---|
713 | !$OMP CRITICAL |
---|
714 | DO k = nzb_u_inner(j,nx) + 1, nzt |
---|
715 | volume_flow_l(1) = volume_flow_l(1) + u(k,j,nx) * dzw(k) |
---|
716 | ENDDO |
---|
717 | !$OMP END CRITICAL |
---|
718 | ENDDO |
---|
719 | !$OMP END PARALLEL |
---|
720 | |
---|
721 | ENDIF |
---|
722 | |
---|
723 | IF ( conserve_volume_flow .AND. bc_ns_cyc .AND. bc_lr_cyc .AND. & |
---|
724 | nyn == ny ) THEN |
---|
725 | |
---|
726 | !$OMP PARALLEL PRIVATE (i,k) |
---|
727 | !$OMP DO |
---|
728 | DO i = nxl, nxr |
---|
729 | !$OMP CRITICAL |
---|
730 | DO k = nzb_v_inner(ny,i) + 1, nzt |
---|
731 | volume_flow_l(2) = volume_flow_l(2) + v(k,ny,i) * dzw(k) |
---|
732 | ENDDO |
---|
733 | !$OMP END CRITICAL |
---|
734 | ENDDO |
---|
735 | !$OMP END PARALLEL |
---|
736 | |
---|
737 | ENDIF |
---|
738 | |
---|
739 | ! |
---|
740 | !-- Conserve the volume flow |
---|
741 | IF ( conserve_volume_flow .AND. ( bc_lr_cyc .AND. bc_ns_cyc ) ) THEN |
---|
742 | |
---|
743 | #if defined( __parallel ) |
---|
744 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
---|
745 | CALL MPI_ALLREDUCE( volume_flow_l(1), volume_flow(1), 2, MPI_REAL, & |
---|
746 | MPI_SUM, comm2d, ierr ) |
---|
747 | #else |
---|
748 | volume_flow = volume_flow_l |
---|
749 | #endif |
---|
750 | |
---|
751 | volume_flow_offset(1:2) = ( volume_flow_initial(1:2) - volume_flow(1:2) ) / & |
---|
752 | volume_flow_area(1:2) |
---|
753 | |
---|
754 | !$OMP PARALLEL PRIVATE (i,j,k) |
---|
755 | !$OMP DO |
---|
756 | DO i = nxl, nxr |
---|
757 | DO j = nys, nyn |
---|
758 | DO k = nzb_u_inner(j,i) + 1, nzt |
---|
759 | u(k,j,i) = u(k,j,i) + volume_flow_offset(1) |
---|
760 | ENDDO |
---|
761 | DO k = nzb_v_inner(j,i) + 1, nzt |
---|
762 | v(k,j,i) = v(k,j,i) + volume_flow_offset(2) |
---|
763 | ENDDO |
---|
764 | ENDDO |
---|
765 | ENDDO |
---|
766 | |
---|
767 | !$OMP END PARALLEL |
---|
768 | |
---|
769 | ENDIF |
---|
770 | |
---|
771 | ! |
---|
772 | !-- Exchange of boundaries for the velocities |
---|
773 | IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs |
---|
774 | on_device = .TRUE. ! to be removed after complete porting |
---|
775 | ELSE ! of ghost point exchange |
---|
776 | !$acc update host( u, v, w ) |
---|
777 | ENDIF |
---|
778 | CALL exchange_horiz( u, nbgp ) |
---|
779 | CALL exchange_horiz( v, nbgp ) |
---|
780 | CALL exchange_horiz( w, nbgp ) |
---|
781 | IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs |
---|
782 | on_device = .FALSE. ! to be removed after complete porting |
---|
783 | ELSE ! of ghost point exchange |
---|
784 | !$acc update device( u, v, w ) |
---|
785 | ENDIF |
---|
786 | |
---|
787 | ! |
---|
788 | !-- Compute the divergence of the corrected velocity field, |
---|
789 | !-- A possible PE-sum is computed in flow_statistics. Carry out computation |
---|
790 | !-- only at last Runge-Kutta step. |
---|
791 | IF ( intermediate_timestep_count == intermediate_timestep_count_max .OR. & |
---|
792 | intermediate_timestep_count == 0 ) THEN |
---|
793 | CALL cpu_log( log_point_s(1), 'divergence', 'start' ) |
---|
794 | sums_divnew_l = 0.0_wp |
---|
795 | |
---|
796 | ! |
---|
797 | !-- d must be reset to zero because it can contain nonzero values below the |
---|
798 | !-- topography |
---|
799 | IF ( topography /= 'flat' ) d = 0.0_wp |
---|
800 | |
---|
801 | localsum = 0.0_wp |
---|
802 | threadsum = 0.0_wp |
---|
803 | |
---|
804 | !$OMP PARALLEL PRIVATE (i,j,k) FIRSTPRIVATE(threadsum) REDUCTION(+:localsum) |
---|
805 | !$OMP DO SCHEDULE( STATIC ) |
---|
806 | #if defined( __ibm ) |
---|
807 | DO i = nxl, nxr |
---|
808 | DO j = nys, nyn |
---|
809 | DO k = nzb_s_inner(j,i)+1, nzt |
---|
810 | d(k,j,i) = ( u(k,j,i+1) - u(k,j,i) ) * ddx + & |
---|
811 | ( v(k,j+1,i) - v(k,j,i) ) * ddy + & |
---|
812 | ( w(k,j,i) - w(k-1,j,i) ) * ddzw(k) |
---|
813 | ENDDO |
---|
814 | DO k = nzb+1, nzt |
---|
815 | threadsum = threadsum + ABS( d(k,j,i) ) |
---|
816 | ENDDO |
---|
817 | ENDDO |
---|
818 | ENDDO |
---|
819 | #else |
---|
820 | !$acc kernels present( d, ddzw, rflags_s_inner, u, v, w ) |
---|
821 | !$acc loop collapse( 3 ) |
---|
822 | DO i = nxl, nxr |
---|
823 | DO j = nys, nyn |
---|
824 | DO k = 1, nzt |
---|
825 | d(k,j,i) = ( ( u(k,j,i+1) - u(k,j,i) ) * ddx + & |
---|
826 | ( v(k,j+1,i) - v(k,j,i) ) * ddy + & |
---|
827 | ( w(k,j,i) - w(k-1,j,i) ) * ddzw(k) & |
---|
828 | ) * rflags_s_inner(k,j,i) |
---|
829 | ENDDO |
---|
830 | ENDDO |
---|
831 | ENDDO |
---|
832 | !$acc end kernels |
---|
833 | ! |
---|
834 | !-- Compute possible PE-sum of divergences for flow_statistics |
---|
835 | !$acc parallel loop collapse(3) present( d ) reduction(+:threadsum) |
---|
836 | DO i = nxl, nxr |
---|
837 | DO j = nys, nyn |
---|
838 | DO k = nzb+1, nzt |
---|
839 | threadsum = threadsum + ABS( d(k,j,i) ) |
---|
840 | ENDDO |
---|
841 | ENDDO |
---|
842 | ENDDO |
---|
843 | !$acc end parallel loop |
---|
844 | #endif |
---|
845 | |
---|
846 | localsum = localsum + threadsum |
---|
847 | !$OMP END PARALLEL |
---|
848 | |
---|
849 | ! |
---|
850 | !-- For completeness, set the divergence sum of all statistic regions to those |
---|
851 | !-- of the total domain |
---|
852 | sums_divnew_l(0:statistic_regions) = localsum |
---|
853 | |
---|
854 | CALL cpu_log( log_point_s(1), 'divergence', 'stop' ) |
---|
855 | |
---|
856 | ENDIF |
---|
857 | |
---|
858 | CALL cpu_log( log_point(8), 'pres', 'stop' ) |
---|
859 | |
---|
860 | |
---|
861 | END SUBROUTINE pres |
---|