[1] | 1 | SUBROUTINE pres |
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| 2 | |
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[1036] | 3 | !--------------------------------------------------------------------------------! |
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| 4 | ! This file is part of PALM. |
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| 5 | ! |
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| 6 | ! PALM is free software: you can redistribute it and/or modify it under the terms |
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| 7 | ! of the GNU General Public License as published by the Free Software Foundation, |
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| 8 | ! either version 3 of the License, or (at your option) any later version. |
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| 9 | ! |
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| 10 | ! PALM is distributed in the hope that it will be useful, but WITHOUT ANY |
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| 11 | ! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR |
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| 12 | ! A PARTICULAR PURPOSE. See the GNU General Public License for more details. |
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| 13 | ! |
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| 14 | ! You should have received a copy of the GNU General Public License along with |
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| 15 | ! PALM. If not, see <http://www.gnu.org/licenses/>. |
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| 16 | ! |
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[1310] | 17 | ! Copyright 1997-2014 Leibniz Universitaet Hannover |
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[1036] | 18 | !--------------------------------------------------------------------------------! |
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| 19 | ! |
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[484] | 20 | ! Current revisions: |
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[1212] | 21 | ! ------------------ |
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[1343] | 22 | ! |
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[1576] | 23 | ! |
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[1321] | 24 | ! Former revisions: |
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| 25 | ! ----------------- |
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| 26 | ! $Id: pres.f90 1576 2015-03-27 10:23:30Z heinze $ |
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| 27 | ! |
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[1576] | 28 | ! 1575 2015-03-27 09:56:27Z raasch |
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| 29 | ! poismg_fast + respective module added, adjustments for psolver-queries |
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| 30 | ! |
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[1343] | 31 | ! 1342 2014-03-26 17:04:47Z kanani |
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| 32 | ! REAL constants defined as wp-kind |
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| 33 | ! |
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[1321] | 34 | ! 1320 2014-03-20 08:40:49Z raasch |
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[1320] | 35 | ! ONLY-attribute added to USE-statements, |
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| 36 | ! kind-parameters added to all INTEGER and REAL declaration statements, |
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| 37 | ! kinds are defined in new module kinds, |
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| 38 | ! old module precision_kind is removed, |
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| 39 | ! revision history before 2012 removed, |
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| 40 | ! comment fields (!:) to be used for variable explanations added to |
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| 41 | ! all variable declaration statements |
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[708] | 42 | ! |
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[1319] | 43 | ! 1318 2014-03-17 13:35:16Z raasch |
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| 44 | ! module interfaces removed |
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| 45 | ! |
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[1307] | 46 | ! 1306 2014-03-13 14:30:59Z raasch |
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| 47 | ! second argument removed from routine poisfft |
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| 48 | ! |
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[1258] | 49 | ! 1257 2013-11-08 15:18:40Z raasch |
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| 50 | ! openacc loop and loop vector clauses removed, independent clauses added, |
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| 51 | ! end parallel replaced by end parallel loop |
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| 52 | ! |
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[1222] | 53 | ! 1221 2013-09-10 08:59:13Z raasch |
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| 54 | ! openACC porting of reduction operations, loops for calculating d are |
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| 55 | ! using the rflags_s_inner multiply flag instead of the nzb_s_inner loop index |
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| 56 | ! |
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[1213] | 57 | ! 1212 2013-08-15 08:46:27Z raasch |
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| 58 | ! call of poisfft_hybrid removed |
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| 59 | ! |
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[1118] | 60 | ! 1117 2013-03-27 11:15:36Z suehring |
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| 61 | ! Bugfix in OpenMP parallelization. |
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| 62 | ! |
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[1114] | 63 | ! 1113 2013-03-10 02:48:14Z raasch |
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| 64 | ! GPU-porting of several loops, some loops rearranged |
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| 65 | ! |
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[1112] | 66 | ! 1111 2013-03-08 23:54:10Z |
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| 67 | ! openACC statements added, |
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| 68 | ! ibc_p_b = 2 removed |
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| 69 | ! |
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[1093] | 70 | ! 1092 2013-02-02 11:24:22Z raasch |
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| 71 | ! unused variables removed |
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| 72 | ! |
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[1037] | 73 | ! 1036 2012-10-22 13:43:42Z raasch |
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| 74 | ! code put under GPL (PALM 3.9) |
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| 75 | ! |
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[1004] | 76 | ! 1003 2012-09-14 14:35:53Z raasch |
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| 77 | ! adjustment of array tend for cases with unequal subdomain sizes removed |
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| 78 | ! |
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[1] | 79 | ! Revision 1.1 1997/07/24 11:24:44 raasch |
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| 80 | ! Initial revision |
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| 81 | ! |
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| 82 | ! |
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| 83 | ! Description: |
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| 84 | ! ------------ |
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| 85 | ! Compute the divergence of the provisional velocity field. Solve the Poisson |
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| 86 | ! equation for the perturbation pressure. Compute the final velocities using |
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| 87 | ! this perturbation pressure. Compute the remaining divergence. |
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| 88 | !------------------------------------------------------------------------------! |
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| 89 | |
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[1320] | 90 | USE arrays_3d, & |
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| 91 | ONLY: d, ddzu, ddzu_pres, ddzw, dzw, p, p_loc, tend, u, v, w |
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| 92 | |
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| 93 | USE control_parameters, & |
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| 94 | ONLY: bc_lr_cyc, bc_ns_cyc, conserve_volume_flow, dt_3d, & |
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| 95 | gathered_size, ibc_p_b, ibc_p_t, intermediate_timestep_count, & |
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| 96 | mg_switch_to_pe0_level, on_device, outflow_l, outflow_n, & |
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| 97 | outflow_r, outflow_s, psolver, simulated_time, subdomain_size, & |
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| 98 | topography, volume_flow, volume_flow_area, volume_flow_initial |
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| 99 | |
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| 100 | USE cpulog, & |
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| 101 | ONLY: cpu_log, log_point, log_point_s |
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| 102 | |
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| 103 | USE grid_variables, & |
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| 104 | ONLY: ddx, ddy |
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| 105 | |
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| 106 | USE indices, & |
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| 107 | ONLY: nbgp, ngp_2dh_outer, nx, nxl, nxlg, nxl_mg, nxr, nxrg, nxr_mg, & |
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| 108 | ny, nys, nysg, nys_mg, nyn, nyng, nyn_mg, nzb, nzb_s_inner, & |
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| 109 | nzb_u_inner, nzb_v_inner, nzb_w_inner, nzb_2d, nzt, nzt_mg, & |
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| 110 | rflags_s_inner |
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| 111 | |
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| 112 | USE kinds |
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| 113 | |
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[1] | 114 | USE pegrid |
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| 115 | |
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[1320] | 116 | USE poisfft_mod, & |
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| 117 | ONLY: poisfft |
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| 118 | |
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[1575] | 119 | USE poismg_mod |
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| 120 | |
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[1320] | 121 | USE statistics, & |
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| 122 | ONLY: statistic_regions, sums_divnew_l, sums_divold_l, weight_pres, & |
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| 123 | weight_substep |
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| 124 | |
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[1] | 125 | IMPLICIT NONE |
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| 126 | |
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[1320] | 127 | INTEGER(iwp) :: i !: |
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| 128 | INTEGER(iwp) :: j !: |
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| 129 | INTEGER(iwp) :: k !: |
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[1] | 130 | |
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[1320] | 131 | REAL(wp) :: ddt_3d !: |
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| 132 | REAL(wp) :: localsum !: |
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| 133 | REAL(wp) :: threadsum !: |
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| 134 | REAL(wp) :: d_weight_pres !: |
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[1] | 135 | |
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[1320] | 136 | REAL(wp), DIMENSION(1:2) :: volume_flow_l !: |
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| 137 | REAL(wp), DIMENSION(1:2) :: volume_flow_offset !: |
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| 138 | REAL(wp), DIMENSION(1:nzt) :: w_l !: |
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| 139 | REAL(wp), DIMENSION(1:nzt) :: w_l_l !: |
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[1] | 140 | |
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| 141 | |
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| 142 | CALL cpu_log( log_point(8), 'pres', 'start' ) |
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| 143 | |
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[85] | 144 | |
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[1342] | 145 | ddt_3d = 1.0_wp / dt_3d |
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| 146 | d_weight_pres = 1.0_wp / weight_pres(intermediate_timestep_count) |
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[85] | 147 | |
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[1] | 148 | ! |
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[707] | 149 | !-- Multigrid method expects array d to have one ghost layer. |
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| 150 | !-- |
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[1575] | 151 | IF ( psolver(1:9) == 'multigrid' ) THEN |
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[667] | 152 | |
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[1] | 153 | DEALLOCATE( d ) |
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[667] | 154 | ALLOCATE( d(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1) ) |
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[707] | 155 | |
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| 156 | ! |
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| 157 | !-- Since p is later used to hold the weighted average of the substeps, it |
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| 158 | !-- cannot be used in the iterative solver. Therefore, its initial value is |
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| 159 | !-- stored on p_loc, which is then iteratively advanced in every substep. |
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| 160 | IF ( intermediate_timestep_count == 1 ) THEN |
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| 161 | DO i = nxl-1, nxr+1 |
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| 162 | DO j = nys-1, nyn+1 |
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| 163 | DO k = nzb, nzt+1 |
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| 164 | p_loc(k,j,i) = p(k,j,i) |
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| 165 | ENDDO |
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| 166 | ENDDO |
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| 167 | ENDDO |
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[667] | 168 | ENDIF |
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| 169 | |
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[707] | 170 | ELSEIF ( psolver == 'sor' .AND. intermediate_timestep_count == 1 ) THEN |
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| 171 | |
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| 172 | ! |
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| 173 | !-- Since p is later used to hold the weighted average of the substeps, it |
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| 174 | !-- cannot be used in the iterative solver. Therefore, its initial value is |
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| 175 | !-- stored on p_loc, which is then iteratively advanced in every substep. |
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| 176 | p_loc = p |
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| 177 | |
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[1] | 178 | ENDIF |
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| 179 | |
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| 180 | ! |
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[75] | 181 | !-- Conserve the volume flow at the outflow in case of non-cyclic lateral |
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| 182 | !-- boundary conditions |
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[106] | 183 | !-- WARNING: so far, this conservation does not work at the left/south |
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| 184 | !-- boundary if the topography at the inflow differs from that at the |
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| 185 | !-- outflow! For this case, volume_flow_area needs adjustment! |
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| 186 | ! |
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| 187 | !-- Left/right |
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[709] | 188 | IF ( conserve_volume_flow .AND. ( outflow_l .OR. outflow_r ) ) THEN |
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[680] | 189 | |
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[1342] | 190 | volume_flow(1) = 0.0_wp |
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| 191 | volume_flow_l(1) = 0.0_wp |
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[106] | 192 | |
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| 193 | IF ( outflow_l ) THEN |
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| 194 | i = 0 |
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| 195 | ELSEIF ( outflow_r ) THEN |
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| 196 | i = nx+1 |
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| 197 | ENDIF |
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| 198 | |
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| 199 | DO j = nys, nyn |
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| 200 | ! |
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| 201 | !-- Sum up the volume flow through the south/north boundary |
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[709] | 202 | DO k = nzb_2d(j,i)+1, nzt |
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[667] | 203 | volume_flow_l(1) = volume_flow_l(1) + u(k,j,i) * dzw(k) |
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[106] | 204 | ENDDO |
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| 205 | ENDDO |
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| 206 | |
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| 207 | #if defined( __parallel ) |
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[680] | 208 | IF ( collective_wait ) CALL MPI_BARRIER( comm1dy, ierr ) |
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[106] | 209 | CALL MPI_ALLREDUCE( volume_flow_l(1), volume_flow(1), 1, MPI_REAL, & |
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| 210 | MPI_SUM, comm1dy, ierr ) |
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| 211 | #else |
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| 212 | volume_flow = volume_flow_l |
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| 213 | #endif |
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[709] | 214 | volume_flow_offset(1) = ( volume_flow_initial(1) - volume_flow(1) ) & |
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[106] | 215 | / volume_flow_area(1) |
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| 216 | |
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[667] | 217 | DO j = nysg, nyng |
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[709] | 218 | DO k = nzb_2d(j,i)+1, nzt |
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[106] | 219 | u(k,j,i) = u(k,j,i) + volume_flow_offset(1) |
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| 220 | ENDDO |
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| 221 | ENDDO |
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| 222 | |
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| 223 | ENDIF |
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| 224 | |
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| 225 | ! |
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| 226 | !-- South/north |
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[709] | 227 | IF ( conserve_volume_flow .AND. ( outflow_n .OR. outflow_s ) ) THEN |
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[106] | 228 | |
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[1342] | 229 | volume_flow(2) = 0.0_wp |
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| 230 | volume_flow_l(2) = 0.0_wp |
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[75] | 231 | |
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[106] | 232 | IF ( outflow_s ) THEN |
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| 233 | j = 0 |
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| 234 | ELSEIF ( outflow_n ) THEN |
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[75] | 235 | j = ny+1 |
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[106] | 236 | ENDIF |
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| 237 | |
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| 238 | DO i = nxl, nxr |
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[75] | 239 | ! |
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[106] | 240 | !-- Sum up the volume flow through the south/north boundary |
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[709] | 241 | DO k = nzb_2d(j,i)+1, nzt |
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[667] | 242 | volume_flow_l(2) = volume_flow_l(2) + v(k,j,i) * dzw(k) |
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[75] | 243 | ENDDO |
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[106] | 244 | ENDDO |
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| 245 | |
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[75] | 246 | #if defined( __parallel ) |
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[680] | 247 | IF ( collective_wait ) CALL MPI_BARRIER( comm1dx, ierr ) |
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[75] | 248 | CALL MPI_ALLREDUCE( volume_flow_l(2), volume_flow(2), 1, MPI_REAL, & |
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| 249 | MPI_SUM, comm1dx, ierr ) |
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| 250 | #else |
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| 251 | volume_flow = volume_flow_l |
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| 252 | #endif |
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| 253 | volume_flow_offset(2) = ( volume_flow_initial(2) - volume_flow(2) ) & |
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[106] | 254 | / volume_flow_area(2) |
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[75] | 255 | |
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[667] | 256 | DO i = nxlg, nxrg |
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[709] | 257 | DO k = nzb_v_inner(j,i)+1, nzt |
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[106] | 258 | v(k,j,i) = v(k,j,i) + volume_flow_offset(2) |
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[75] | 259 | ENDDO |
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[106] | 260 | ENDDO |
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[75] | 261 | |
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| 262 | ENDIF |
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| 263 | |
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[76] | 264 | ! |
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| 265 | !-- Remove mean vertical velocity |
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| 266 | IF ( ibc_p_b == 1 .AND. ibc_p_t == 1 ) THEN |
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[1342] | 267 | IF ( simulated_time > 0.0_wp ) THEN ! otherwise nzb_w_inner not yet known |
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| 268 | w_l = 0.0_wp; w_l_l = 0.0_wp |
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[76] | 269 | DO i = nxl, nxr |
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| 270 | DO j = nys, nyn |
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| 271 | DO k = nzb_w_inner(j,i)+1, nzt |
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| 272 | w_l_l(k) = w_l_l(k) + w(k,j,i) |
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| 273 | ENDDO |
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| 274 | ENDDO |
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| 275 | ENDDO |
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| 276 | #if defined( __parallel ) |
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[622] | 277 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
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[709] | 278 | CALL MPI_ALLREDUCE( w_l_l(1), w_l(1), nzt, MPI_REAL, MPI_SUM, & |
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| 279 | comm2d, ierr ) |
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[76] | 280 | #else |
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| 281 | w_l = w_l_l |
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| 282 | #endif |
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| 283 | DO k = 1, nzt |
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| 284 | w_l(k) = w_l(k) / ngp_2dh_outer(k,0) |
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| 285 | ENDDO |
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[667] | 286 | DO i = nxlg, nxrg |
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| 287 | DO j = nysg, nyng |
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[76] | 288 | DO k = nzb_w_inner(j,i)+1, nzt |
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| 289 | w(k,j,i) = w(k,j,i) - w_l(k) |
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| 290 | ENDDO |
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| 291 | ENDDO |
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| 292 | ENDDO |
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| 293 | ENDIF |
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| 294 | ENDIF |
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[75] | 295 | |
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| 296 | ! |
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[1] | 297 | !-- Compute the divergence of the provisional velocity field. |
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| 298 | CALL cpu_log( log_point_s(1), 'divergence', 'start' ) |
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| 299 | |
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[1575] | 300 | IF ( psolver(1:9) == 'multigrid' ) THEN |
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[1] | 301 | !$OMP PARALLEL DO SCHEDULE( STATIC ) |
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| 302 | DO i = nxl-1, nxr+1 |
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| 303 | DO j = nys-1, nyn+1 |
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| 304 | DO k = nzb, nzt+1 |
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[1342] | 305 | d(k,j,i) = 0.0_wp |
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[1] | 306 | ENDDO |
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| 307 | ENDDO |
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| 308 | ENDDO |
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| 309 | ELSE |
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| 310 | !$OMP PARALLEL DO SCHEDULE( STATIC ) |
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[1111] | 311 | !$acc kernels present( d ) |
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[1003] | 312 | DO i = nxl, nxr |
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| 313 | DO j = nys, nyn |
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| 314 | DO k = nzb+1, nzt |
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[1342] | 315 | d(k,j,i) = 0.0_wp |
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[1] | 316 | ENDDO |
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| 317 | ENDDO |
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| 318 | ENDDO |
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[1111] | 319 | !$acc end kernels |
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[1] | 320 | ENDIF |
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| 321 | |
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[1342] | 322 | localsum = 0.0_wp |
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| 323 | threadsum = 0.0_wp |
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[1] | 324 | |
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| 325 | #if defined( __ibm ) |
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| 326 | !$OMP PARALLEL PRIVATE (i,j,k) FIRSTPRIVATE(threadsum) REDUCTION(+:localsum) |
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| 327 | !$OMP DO SCHEDULE( STATIC ) |
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| 328 | DO i = nxl, nxr |
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| 329 | DO j = nys, nyn |
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| 330 | DO k = nzb_s_inner(j,i)+1, nzt |
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[85] | 331 | d(k,j,i) = ( ( u(k,j,i+1) - u(k,j,i) ) * ddx + & |
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| 332 | ( v(k,j+1,i) - v(k,j,i) ) * ddy + & |
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[673] | 333 | ( w(k,j,i) - w(k-1,j,i) ) * ddzw(k) ) * ddt_3d & |
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| 334 | * d_weight_pres |
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[1] | 335 | ENDDO |
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| 336 | ! |
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| 337 | !-- Compute possible PE-sum of divergences for flow_statistics |
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| 338 | DO k = nzb_s_inner(j,i)+1, nzt |
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| 339 | threadsum = threadsum + ABS( d(k,j,i) ) |
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| 340 | ENDDO |
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| 341 | |
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| 342 | ENDDO |
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| 343 | ENDDO |
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| 344 | |
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[707] | 345 | localsum = localsum + threadsum * dt_3d * & |
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| 346 | weight_pres(intermediate_timestep_count) |
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[693] | 347 | |
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[1] | 348 | !$OMP END PARALLEL |
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| 349 | #else |
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| 350 | |
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[1111] | 351 | !$OMP PARALLEL PRIVATE (i,j,k) |
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| 352 | !$OMP DO SCHEDULE( STATIC ) |
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[1221] | 353 | !$acc kernels present( d, ddzw, rflags_s_inner, u, v, w ) |
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| 354 | !$acc loop collapse( 3 ) |
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[1111] | 355 | DO i = nxl, nxr |
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| 356 | DO j = nys, nyn |
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| 357 | DO k = 1, nzt |
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[1221] | 358 | d(k,j,i) = ( ( u(k,j,i+1) - u(k,j,i) ) * ddx + & |
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| 359 | ( v(k,j+1,i) - v(k,j,i) ) * ddy + & |
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| 360 | ( w(k,j,i) - w(k-1,j,i) ) * ddzw(k) ) * ddt_3d & |
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| 361 | * d_weight_pres * rflags_s_inner(k,j,i) |
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[1] | 362 | ENDDO |
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| 363 | ENDDO |
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[1111] | 364 | ENDDO |
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| 365 | !$acc end kernels |
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| 366 | !$OMP END PARALLEL |
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[1] | 367 | |
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| 368 | ! |
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| 369 | !-- Compute possible PE-sum of divergences for flow_statistics |
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| 370 | !$OMP PARALLEL PRIVATE (i,j,k) FIRSTPRIVATE(threadsum) REDUCTION(+:localsum) |
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| 371 | !$OMP DO SCHEDULE( STATIC ) |
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[1221] | 372 | !$acc parallel loop collapse(3) present( d ) reduction(+:threadsum) |
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[1] | 373 | DO i = nxl, nxr |
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| 374 | DO j = nys, nyn |
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| 375 | DO k = nzb+1, nzt |
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| 376 | threadsum = threadsum + ABS( d(k,j,i) ) |
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| 377 | ENDDO |
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| 378 | ENDDO |
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| 379 | ENDDO |
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[1257] | 380 | !$acc end parallel loop |
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[707] | 381 | localsum = localsum + threadsum * dt_3d * & |
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| 382 | weight_pres(intermediate_timestep_count) |
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[1] | 383 | !$OMP END PARALLEL |
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| 384 | #endif |
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| 385 | |
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| 386 | ! |
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| 387 | !-- For completeness, set the divergence sum of all statistic regions to those |
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| 388 | !-- of the total domain |
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| 389 | sums_divold_l(0:statistic_regions) = localsum |
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| 390 | |
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| 391 | CALL cpu_log( log_point_s(1), 'divergence', 'stop' ) |
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| 392 | |
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| 393 | ! |
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| 394 | !-- Compute the pressure perturbation solving the Poisson equation |
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[1575] | 395 | IF ( psolver == 'poisfft' ) THEN |
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[1] | 396 | |
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| 397 | ! |
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| 398 | !-- Solve Poisson equation via FFT and solution of tridiagonal matrices |
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[1575] | 399 | CALL poisfft( d ) |
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[1212] | 400 | |
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[1] | 401 | ! |
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| 402 | !-- Store computed perturbation pressure and set boundary condition in |
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| 403 | !-- z-direction |
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| 404 | !$OMP PARALLEL DO |
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[1113] | 405 | !$acc kernels present( d, tend ) |
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[1] | 406 | DO i = nxl, nxr |
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| 407 | DO j = nys, nyn |
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| 408 | DO k = nzb+1, nzt |
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| 409 | tend(k,j,i) = d(k,j,i) |
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| 410 | ENDDO |
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| 411 | ENDDO |
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| 412 | ENDDO |
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[1113] | 413 | !$acc end kernels |
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[1] | 414 | |
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| 415 | ! |
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| 416 | !-- Bottom boundary: |
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| 417 | !-- This condition is only required for internal output. The pressure |
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| 418 | !-- gradient (dp(nzb+1)-dp(nzb))/dz is not used anywhere else. |
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| 419 | IF ( ibc_p_b == 1 ) THEN |
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| 420 | ! |
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| 421 | !-- Neumann (dp/dz = 0) |
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| 422 | !$OMP PARALLEL DO |
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[1113] | 423 | !$acc kernels present( nzb_s_inner, tend ) |
---|
[667] | 424 | DO i = nxlg, nxrg |
---|
| 425 | DO j = nysg, nyng |
---|
[1] | 426 | tend(nzb_s_inner(j,i),j,i) = tend(nzb_s_inner(j,i)+1,j,i) |
---|
| 427 | ENDDO |
---|
| 428 | ENDDO |
---|
[1113] | 429 | !$acc end kernels |
---|
[1] | 430 | |
---|
| 431 | ELSE |
---|
| 432 | ! |
---|
| 433 | !-- Dirichlet |
---|
| 434 | !$OMP PARALLEL DO |
---|
[1113] | 435 | !$acc kernels present( tend ) |
---|
[667] | 436 | DO i = nxlg, nxrg |
---|
| 437 | DO j = nysg, nyng |
---|
[1342] | 438 | tend(nzb_s_inner(j,i),j,i) = 0.0_wp |
---|
[1] | 439 | ENDDO |
---|
| 440 | ENDDO |
---|
[1113] | 441 | !$acc end kernels |
---|
[1] | 442 | |
---|
| 443 | ENDIF |
---|
| 444 | |
---|
| 445 | ! |
---|
| 446 | !-- Top boundary |
---|
| 447 | IF ( ibc_p_t == 1 ) THEN |
---|
| 448 | ! |
---|
| 449 | !-- Neumann |
---|
| 450 | !$OMP PARALLEL DO |
---|
[1113] | 451 | !$acc kernels present( tend ) |
---|
[667] | 452 | DO i = nxlg, nxrg |
---|
| 453 | DO j = nysg, nyng |
---|
[1] | 454 | tend(nzt+1,j,i) = tend(nzt,j,i) |
---|
| 455 | ENDDO |
---|
| 456 | ENDDO |
---|
[1113] | 457 | !$acc end kernels |
---|
[1] | 458 | |
---|
| 459 | ELSE |
---|
| 460 | ! |
---|
| 461 | !-- Dirichlet |
---|
| 462 | !$OMP PARALLEL DO |
---|
[1113] | 463 | !$acc kernels present( tend ) |
---|
[667] | 464 | DO i = nxlg, nxrg |
---|
| 465 | DO j = nysg, nyng |
---|
[1342] | 466 | tend(nzt+1,j,i) = 0.0_wp |
---|
[1] | 467 | ENDDO |
---|
| 468 | ENDDO |
---|
[1113] | 469 | !$acc end kernels |
---|
[1] | 470 | |
---|
| 471 | ENDIF |
---|
| 472 | |
---|
| 473 | ! |
---|
| 474 | !-- Exchange boundaries for p |
---|
[1113] | 475 | IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs |
---|
| 476 | on_device = .TRUE. ! to be removed after complete porting |
---|
| 477 | ELSE ! of ghost point exchange |
---|
| 478 | !$acc update host( tend ) |
---|
| 479 | ENDIF |
---|
[667] | 480 | CALL exchange_horiz( tend, nbgp ) |
---|
[1113] | 481 | IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs |
---|
| 482 | on_device = .FALSE. ! to be removed after complete porting |
---|
| 483 | ELSE ! of ghost point exchange |
---|
| 484 | !$acc update device( tend ) |
---|
| 485 | ENDIF |
---|
[1] | 486 | |
---|
| 487 | ELSEIF ( psolver == 'sor' ) THEN |
---|
| 488 | |
---|
| 489 | ! |
---|
| 490 | !-- Solve Poisson equation for perturbation pressure using SOR-Red/Black |
---|
| 491 | !-- scheme |
---|
[707] | 492 | CALL sor( d, ddzu_pres, ddzw, p_loc ) |
---|
| 493 | tend = p_loc |
---|
[1] | 494 | |
---|
[1575] | 495 | ELSEIF ( psolver(1:9) == 'multigrid' ) THEN |
---|
[1] | 496 | |
---|
| 497 | ! |
---|
| 498 | !-- Solve Poisson equation for perturbation pressure using Multigrid scheme, |
---|
[667] | 499 | !-- array tend is used to store the residuals, logical exchange_mg is used |
---|
| 500 | !-- to discern data exchange in multigrid ( 1 ghostpoint ) and normal grid |
---|
| 501 | !-- ( nbgp ghost points ). |
---|
[778] | 502 | |
---|
| 503 | !-- If the number of grid points of the gathered grid, which is collected |
---|
| 504 | !-- on PE0, is larger than the number of grid points of an PE, than array |
---|
| 505 | !-- tend will be enlarged. |
---|
| 506 | IF ( gathered_size > subdomain_size ) THEN |
---|
| 507 | DEALLOCATE( tend ) |
---|
| 508 | ALLOCATE( tend(nzb:nzt_mg(mg_switch_to_pe0_level)+1,nys_mg( & |
---|
| 509 | mg_switch_to_pe0_level)-1:nyn_mg(mg_switch_to_pe0_level)+1,& |
---|
| 510 | nxl_mg(mg_switch_to_pe0_level)-1:nxr_mg( & |
---|
| 511 | mg_switch_to_pe0_level)+1) ) |
---|
| 512 | ENDIF |
---|
| 513 | |
---|
[1575] | 514 | IF ( psolver == 'multigrid' ) THEN |
---|
| 515 | CALL poismg( tend ) |
---|
| 516 | ELSE |
---|
| 517 | CALL poismg_fast( tend ) |
---|
| 518 | ENDIF |
---|
[707] | 519 | |
---|
[778] | 520 | IF ( gathered_size > subdomain_size ) THEN |
---|
| 521 | DEALLOCATE( tend ) |
---|
| 522 | ALLOCATE( tend(nzb:nzt+1,nysg:nyng,nxlg:nxrg) ) |
---|
| 523 | ENDIF |
---|
| 524 | |
---|
[1] | 525 | ! |
---|
| 526 | !-- Restore perturbation pressure on tend because this array is used |
---|
| 527 | !-- further below to correct the velocity fields |
---|
[707] | 528 | DO i = nxl-1, nxr+1 |
---|
| 529 | DO j = nys-1, nyn+1 |
---|
| 530 | DO k = nzb, nzt+1 |
---|
| 531 | tend(k,j,i) = p_loc(k,j,i) |
---|
| 532 | ENDDO |
---|
| 533 | ENDDO |
---|
| 534 | ENDDO |
---|
[667] | 535 | |
---|
[1] | 536 | ENDIF |
---|
| 537 | |
---|
| 538 | ! |
---|
[707] | 539 | !-- Store perturbation pressure on array p, used for pressure data output. |
---|
| 540 | !-- Ghost layers are added in the output routines (except sor-method: see below) |
---|
| 541 | IF ( intermediate_timestep_count == 1 ) THEN |
---|
| 542 | !$OMP PARALLEL PRIVATE (i,j,k) |
---|
| 543 | !$OMP DO |
---|
[1113] | 544 | !$acc kernels present( p, tend, weight_substep ) |
---|
[1257] | 545 | !$acc loop independent |
---|
[707] | 546 | DO i = nxl-1, nxr+1 |
---|
[1257] | 547 | !$acc loop independent |
---|
[707] | 548 | DO j = nys-1, nyn+1 |
---|
[1257] | 549 | !$acc loop independent |
---|
[707] | 550 | DO k = nzb, nzt+1 |
---|
| 551 | p(k,j,i) = tend(k,j,i) * & |
---|
| 552 | weight_substep(intermediate_timestep_count) |
---|
[673] | 553 | ENDDO |
---|
[1] | 554 | ENDDO |
---|
[707] | 555 | ENDDO |
---|
[1113] | 556 | !$acc end kernels |
---|
[707] | 557 | !$OMP END PARALLEL |
---|
| 558 | |
---|
| 559 | ELSE |
---|
| 560 | !$OMP PARALLEL PRIVATE (i,j,k) |
---|
| 561 | !$OMP DO |
---|
[1113] | 562 | !$acc kernels present( p, tend, weight_substep ) |
---|
[1257] | 563 | !$acc loop independent |
---|
[707] | 564 | DO i = nxl-1, nxr+1 |
---|
[1257] | 565 | !$acc loop independent |
---|
[707] | 566 | DO j = nys-1, nyn+1 |
---|
[1257] | 567 | !$acc loop independent |
---|
[707] | 568 | DO k = nzb, nzt+1 |
---|
| 569 | p(k,j,i) = p(k,j,i) + tend(k,j,i) * & |
---|
| 570 | weight_substep(intermediate_timestep_count) |
---|
[673] | 571 | ENDDO |
---|
| 572 | ENDDO |
---|
[707] | 573 | ENDDO |
---|
[1113] | 574 | !$acc end kernels |
---|
[707] | 575 | !$OMP END PARALLEL |
---|
| 576 | |
---|
| 577 | ENDIF |
---|
[673] | 578 | |
---|
[707] | 579 | ! |
---|
| 580 | !-- SOR-method needs ghost layers for the next timestep |
---|
| 581 | IF ( psolver == 'sor' ) CALL exchange_horiz( p, nbgp ) |
---|
[682] | 582 | |
---|
[1] | 583 | ! |
---|
| 584 | !-- Correction of the provisional velocities with the current perturbation |
---|
| 585 | !-- pressure just computed |
---|
[709] | 586 | IF ( conserve_volume_flow .AND. ( bc_lr_cyc .OR. bc_ns_cyc ) ) THEN |
---|
[1342] | 587 | volume_flow_l(1) = 0.0_wp |
---|
| 588 | volume_flow_l(2) = 0.0_wp |
---|
[1] | 589 | ENDIF |
---|
[707] | 590 | |
---|
[1] | 591 | !$OMP PARALLEL PRIVATE (i,j,k) |
---|
| 592 | !$OMP DO |
---|
[1113] | 593 | !$acc kernels present( ddzu, nzb_u_inner, nzb_v_inner, nzb_w_inner, tend, u, v, w, weight_pres ) |
---|
[1257] | 594 | !$acc loop independent |
---|
[673] | 595 | DO i = nxl, nxr |
---|
[1257] | 596 | !$acc loop independent |
---|
[1] | 597 | DO j = nys, nyn |
---|
[1257] | 598 | !$acc loop independent |
---|
[1113] | 599 | DO k = 1, nzt |
---|
| 600 | IF ( k > nzb_w_inner(j,i) ) THEN |
---|
| 601 | w(k,j,i) = w(k,j,i) - dt_3d * & |
---|
| 602 | ( tend(k+1,j,i) - tend(k,j,i) ) * ddzu(k+1) * & |
---|
| 603 | weight_pres(intermediate_timestep_count) |
---|
| 604 | ENDIF |
---|
[1] | 605 | ENDDO |
---|
[1257] | 606 | !$acc loop independent |
---|
[1113] | 607 | DO k = 1, nzt |
---|
| 608 | IF ( k > nzb_u_inner(j,i) ) THEN |
---|
| 609 | u(k,j,i) = u(k,j,i) - dt_3d * & |
---|
| 610 | ( tend(k,j,i) - tend(k,j,i-1) ) * ddx * & |
---|
| 611 | weight_pres(intermediate_timestep_count) |
---|
| 612 | ENDIF |
---|
[1] | 613 | ENDDO |
---|
[1257] | 614 | !$acc loop independent |
---|
[1113] | 615 | DO k = 1, nzt |
---|
| 616 | IF ( k > nzb_v_inner(j,i) ) THEN |
---|
| 617 | v(k,j,i) = v(k,j,i) - dt_3d * & |
---|
| 618 | ( tend(k,j,i) - tend(k,j-1,i) ) * ddy * & |
---|
| 619 | weight_pres(intermediate_timestep_count) |
---|
| 620 | ENDIF |
---|
[673] | 621 | ENDDO |
---|
[1] | 622 | |
---|
| 623 | ENDDO |
---|
| 624 | ENDDO |
---|
[1113] | 625 | !$acc end kernels |
---|
[1] | 626 | !$OMP END PARALLEL |
---|
[1113] | 627 | |
---|
| 628 | ! |
---|
| 629 | !-- Sum up the volume flow through the right and north boundary |
---|
| 630 | IF ( conserve_volume_flow .AND. bc_lr_cyc .AND. bc_ns_cyc .AND. & |
---|
| 631 | nxr == nx ) THEN |
---|
| 632 | |
---|
| 633 | !$OMP PARALLEL PRIVATE (j,k) |
---|
| 634 | !$OMP DO |
---|
| 635 | DO j = nys, nyn |
---|
| 636 | !$OMP CRITICAL |
---|
| 637 | DO k = nzb_2d(j,nx) + 1, nzt |
---|
| 638 | volume_flow_l(1) = volume_flow_l(1) + u(k,j,nx) * dzw(k) |
---|
| 639 | ENDDO |
---|
| 640 | !$OMP END CRITICAL |
---|
| 641 | ENDDO |
---|
| 642 | !$OMP END PARALLEL |
---|
| 643 | |
---|
| 644 | ENDIF |
---|
| 645 | |
---|
| 646 | IF ( conserve_volume_flow .AND. bc_ns_cyc .AND. bc_lr_cyc .AND. & |
---|
| 647 | nyn == ny ) THEN |
---|
| 648 | |
---|
| 649 | !$OMP PARALLEL PRIVATE (i,k) |
---|
| 650 | !$OMP DO |
---|
| 651 | DO i = nxl, nxr |
---|
| 652 | !$OMP CRITICAL |
---|
| 653 | DO k = nzb_2d(ny,i) + 1, nzt |
---|
| 654 | volume_flow_l(2) = volume_flow_l(2) + v(k,ny,i) * dzw(k) |
---|
| 655 | ENDDO |
---|
| 656 | !$OMP END CRITICAL |
---|
| 657 | ENDDO |
---|
| 658 | !$OMP END PARALLEL |
---|
| 659 | |
---|
| 660 | ENDIF |
---|
[673] | 661 | |
---|
[1] | 662 | ! |
---|
| 663 | !-- Conserve the volume flow |
---|
[707] | 664 | IF ( conserve_volume_flow .AND. ( bc_lr_cyc .AND. bc_ns_cyc ) ) THEN |
---|
[1] | 665 | |
---|
| 666 | #if defined( __parallel ) |
---|
[622] | 667 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
---|
[1] | 668 | CALL MPI_ALLREDUCE( volume_flow_l(1), volume_flow(1), 2, MPI_REAL, & |
---|
| 669 | MPI_SUM, comm2d, ierr ) |
---|
| 670 | #else |
---|
| 671 | volume_flow = volume_flow_l |
---|
| 672 | #endif |
---|
| 673 | |
---|
| 674 | volume_flow_offset = ( volume_flow_initial - volume_flow ) / & |
---|
| 675 | volume_flow_area |
---|
| 676 | |
---|
| 677 | !$OMP PARALLEL PRIVATE (i,j,k) |
---|
| 678 | !$OMP DO |
---|
| 679 | DO i = nxl, nxr |
---|
| 680 | DO j = nys, nyn |
---|
[667] | 681 | DO k = nzb_u_inner(j,i) + 1, nzt |
---|
| 682 | u(k,j,i) = u(k,j,i) + volume_flow_offset(1) |
---|
[719] | 683 | ENDDO |
---|
| 684 | DO k = nzb_v_inner(j,i) + 1, nzt |
---|
[667] | 685 | v(k,j,i) = v(k,j,i) + volume_flow_offset(2) |
---|
| 686 | ENDDO |
---|
[1] | 687 | ENDDO |
---|
| 688 | ENDDO |
---|
[667] | 689 | |
---|
[1] | 690 | !$OMP END PARALLEL |
---|
| 691 | |
---|
| 692 | ENDIF |
---|
| 693 | |
---|
| 694 | ! |
---|
| 695 | !-- Exchange of boundaries for the velocities |
---|
[1113] | 696 | IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs |
---|
| 697 | on_device = .TRUE. ! to be removed after complete porting |
---|
| 698 | ELSE ! of ghost point exchange |
---|
| 699 | !$acc update host( u, v, w ) |
---|
| 700 | ENDIF |
---|
[667] | 701 | CALL exchange_horiz( u, nbgp ) |
---|
| 702 | CALL exchange_horiz( v, nbgp ) |
---|
| 703 | CALL exchange_horiz( w, nbgp ) |
---|
[1113] | 704 | IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs |
---|
| 705 | on_device = .FALSE. ! to be removed after complete porting |
---|
| 706 | ELSE ! of ghost point exchange |
---|
| 707 | !$acc update device( u, v, w ) |
---|
| 708 | ENDIF |
---|
[1] | 709 | |
---|
| 710 | ! |
---|
| 711 | !-- Compute the divergence of the corrected velocity field, |
---|
| 712 | !-- a possible PE-sum is computed in flow_statistics |
---|
| 713 | CALL cpu_log( log_point_s(1), 'divergence', 'start' ) |
---|
[1342] | 714 | sums_divnew_l = 0.0_wp |
---|
[1] | 715 | |
---|
| 716 | ! |
---|
| 717 | !-- d must be reset to zero because it can contain nonzero values below the |
---|
| 718 | !-- topography |
---|
[1342] | 719 | IF ( topography /= 'flat' ) d = 0.0_wp |
---|
[1] | 720 | |
---|
[1342] | 721 | localsum = 0.0_wp |
---|
| 722 | threadsum = 0.0_wp |
---|
[1] | 723 | |
---|
| 724 | !$OMP PARALLEL PRIVATE (i,j,k) FIRSTPRIVATE(threadsum) REDUCTION(+:localsum) |
---|
| 725 | !$OMP DO SCHEDULE( STATIC ) |
---|
| 726 | #if defined( __ibm ) |
---|
| 727 | DO i = nxl, nxr |
---|
| 728 | DO j = nys, nyn |
---|
| 729 | DO k = nzb_s_inner(j,i)+1, nzt |
---|
| 730 | d(k,j,i) = ( u(k,j,i+1) - u(k,j,i) ) * ddx + & |
---|
| 731 | ( v(k,j+1,i) - v(k,j,i) ) * ddy + & |
---|
| 732 | ( w(k,j,i) - w(k-1,j,i) ) * ddzw(k) |
---|
| 733 | ENDDO |
---|
| 734 | DO k = nzb+1, nzt |
---|
| 735 | threadsum = threadsum + ABS( d(k,j,i) ) |
---|
| 736 | ENDDO |
---|
| 737 | ENDDO |
---|
| 738 | ENDDO |
---|
| 739 | #else |
---|
[1221] | 740 | !$acc kernels present( d, ddzw, rflags_s_inner, u, v, w ) |
---|
| 741 | !$acc loop collapse( 3 ) |
---|
[1] | 742 | DO i = nxl, nxr |
---|
| 743 | DO j = nys, nyn |
---|
[1113] | 744 | DO k = 1, nzt |
---|
[1221] | 745 | d(k,j,i) = ( ( u(k,j,i+1) - u(k,j,i) ) * ddx + & |
---|
| 746 | ( v(k,j+1,i) - v(k,j,i) ) * ddy + & |
---|
| 747 | ( w(k,j,i) - w(k-1,j,i) ) * ddzw(k) & |
---|
| 748 | ) * rflags_s_inner(k,j,i) |
---|
[1113] | 749 | ENDDO |
---|
| 750 | ENDDO |
---|
| 751 | ENDDO |
---|
| 752 | !$acc end kernels |
---|
| 753 | ! |
---|
| 754 | !-- Compute possible PE-sum of divergences for flow_statistics |
---|
[1221] | 755 | !$acc parallel loop collapse(3) present( d ) reduction(+:threadsum) |
---|
[1113] | 756 | DO i = nxl, nxr |
---|
| 757 | DO j = nys, nyn |
---|
[1221] | 758 | DO k = nzb+1, nzt |
---|
[1] | 759 | threadsum = threadsum + ABS( d(k,j,i) ) |
---|
| 760 | ENDDO |
---|
| 761 | ENDDO |
---|
| 762 | ENDDO |
---|
[1257] | 763 | !$acc end parallel loop |
---|
[1] | 764 | #endif |
---|
[667] | 765 | |
---|
[1] | 766 | localsum = localsum + threadsum |
---|
| 767 | !$OMP END PARALLEL |
---|
| 768 | |
---|
| 769 | ! |
---|
| 770 | !-- For completeness, set the divergence sum of all statistic regions to those |
---|
| 771 | !-- of the total domain |
---|
| 772 | sums_divnew_l(0:statistic_regions) = localsum |
---|
| 773 | |
---|
| 774 | CALL cpu_log( log_point_s(1), 'divergence', 'stop' ) |
---|
| 775 | |
---|
| 776 | CALL cpu_log( log_point(8), 'pres', 'stop' ) |
---|
| 777 | |
---|
| 778 | |
---|
| 779 | END SUBROUTINE pres |
---|