[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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| 17 | ! Copyright 1997-2012 Leibniz University Hannover |
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| 18 | !--------------------------------------------------------------------------------! |
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| 19 | ! |
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[484] | 20 | ! Current revisions: |
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[1212] | 21 | ! ------------------ |
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[708] | 22 | ! |
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[1258] | 23 | ! |
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[708] | 24 | ! Former revisions: |
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| 25 | ! ----------------- |
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| 26 | ! $Id: pres.f90 1258 2013-11-08 16:09:09Z heinze $ |
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| 27 | ! |
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[1258] | 28 | ! 1257 2013-11-08 15:18:40Z raasch |
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| 29 | ! openacc loop and loop vector clauses removed, independent clauses added, |
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| 30 | ! end parallel replaced by end parallel loop |
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| 31 | ! |
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[1222] | 32 | ! 1221 2013-09-10 08:59:13Z raasch |
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| 33 | ! openACC porting of reduction operations, loops for calculating d are |
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| 34 | ! using the rflags_s_inner multiply flag instead of the nzb_s_inner loop index |
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| 35 | ! |
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[1213] | 36 | ! 1212 2013-08-15 08:46:27Z raasch |
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| 37 | ! call of poisfft_hybrid removed |
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| 38 | ! |
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[1118] | 39 | ! 1117 2013-03-27 11:15:36Z suehring |
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| 40 | ! Bugfix in OpenMP parallelization. |
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| 41 | ! |
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[1114] | 42 | ! 1113 2013-03-10 02:48:14Z raasch |
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| 43 | ! GPU-porting of several loops, some loops rearranged |
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| 44 | ! |
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[1112] | 45 | ! 1111 2013-03-08 23:54:10Z |
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| 46 | ! openACC statements added, |
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| 47 | ! ibc_p_b = 2 removed |
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| 48 | ! |
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[1093] | 49 | ! 1092 2013-02-02 11:24:22Z raasch |
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| 50 | ! unused variables removed |
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| 51 | ! |
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[1037] | 52 | ! 1036 2012-10-22 13:43:42Z raasch |
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| 53 | ! code put under GPL (PALM 3.9) |
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| 54 | ! |
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[1004] | 55 | ! 1003 2012-09-14 14:35:53Z raasch |
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| 56 | ! adjustment of array tend for cases with unequal subdomain sizes removed |
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| 57 | ! |
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[779] | 58 | ! 778 2011-11-07 14:18:25Z fricke |
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| 59 | ! New allocation of tend when multigrid is used and the collected field on PE0 |
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| 60 | ! has more grid points than the subdomain of an PE. |
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| 61 | ! |
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[720] | 62 | ! 719 2011-04-06 13:05:23Z gryschka |
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| 63 | ! Bugfix in volume flow control for double cyclic boundary conditions |
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| 64 | ! |
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[710] | 65 | ! 709 2011-03-30 09:31:40Z raasch |
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| 66 | ! formatting adjustments |
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| 67 | ! |
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[708] | 68 | ! 707 2011-03-29 11:39:40Z raasch |
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[707] | 69 | ! Calculation of weighted average of p is now handled in the same way |
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| 70 | ! regardless of the number of ghost layers (advection scheme), |
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| 71 | ! multigrid and sor method are using p_loc for iterative advancements of |
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| 72 | ! pressure, |
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| 73 | ! localsum calculation modified for proper OpenMP reduction, |
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| 74 | ! bc_lr/ns replaced by bc_lr/ns_cyc |
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[674] | 75 | ! |
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[694] | 76 | ! 693 2011-03-08 09:..:..Z raasch |
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[695] | 77 | ! bugfix: weighting coefficient added to ibm branch |
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[694] | 78 | ! |
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| 79 | ! 680 2011-02-04 23:16:06Z gryschka |
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[681] | 80 | ! bugfix: collective_wait |
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[668] | 81 | ! |
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[676] | 82 | ! 675 2011-01-19 10:56:55Z suehring |
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| 83 | ! Removed bugfix while copying tend. |
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| 84 | ! |
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[674] | 85 | ! 673 2011-01-18 16:19:48Z suehring |
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| 86 | ! Weighting coefficients added for right computation of the pressure during |
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| 87 | ! Runge-Kutta substeps. |
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| 88 | ! |
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[668] | 89 | ! 667 2010-12-23 12:06:00Z suehring/gryschka |
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[667] | 90 | ! New allocation of tend when ws-scheme and multigrid is used. This is due to |
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| 91 | ! reasons of perforance of the data_exchange. The same is done with p after |
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| 92 | ! poismg is called. |
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| 93 | ! nxl-1, nxr+1, nys-1, nyn+1 replaced by nxlg, nxrg, nysg, nyng when no |
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| 94 | ! multigrid is used. Calls of exchange_horiz are modified. |
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| 95 | ! bugfix: After pressure correction no volume flow correction in case of |
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| 96 | ! non-cyclic boundary conditions |
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| 97 | ! (has to be done only before pressure correction) |
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| 98 | ! Call of SOR routine is referenced with ddzu_pres. |
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| 99 | ! |
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[623] | 100 | ! 622 2010-12-10 08:08:13Z raasch |
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| 101 | ! optional barriers included in order to speed up collective operations |
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| 102 | ! |
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[198] | 103 | ! 151 2008-03-07 13:42:18Z raasch |
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| 104 | ! Bugfix in volume flow control for non-cyclic boundary conditions |
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| 105 | ! |
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[110] | 106 | ! 106 2007-08-16 14:30:26Z raasch |
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| 107 | ! Volume flow conservation added for the remaining three outflow boundaries |
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| 108 | ! |
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[90] | 109 | ! 85 2007-05-11 09:35:14Z raasch |
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| 110 | ! Division through dt_3d replaced by multiplication of the inverse. |
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| 111 | ! For performance optimisation, this is done in the loop calculating the |
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| 112 | ! divergence instead of using a seperate loop. |
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| 113 | ! |
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[77] | 114 | ! 75 2007-03-22 09:54:05Z raasch |
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[75] | 115 | ! Volume flow control for non-cyclic boundary conditions added (currently only |
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[76] | 116 | ! for the north boundary!!), 2nd+3rd argument removed from exchange horiz, |
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| 117 | ! mean vertical velocity is removed in case of Neumann boundary conditions |
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| 118 | ! both at the bottom and the top |
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[1] | 119 | ! |
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[3] | 120 | ! RCS Log replace by Id keyword, revision history cleaned up |
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| 121 | ! |
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[1] | 122 | ! Revision 1.25 2006/04/26 13:26:12 raasch |
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| 123 | ! OpenMP optimization (+localsum, threadsum) |
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| 124 | ! |
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| 125 | ! Revision 1.1 1997/07/24 11:24:44 raasch |
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| 126 | ! Initial revision |
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| 127 | ! |
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| 128 | ! |
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| 129 | ! Description: |
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| 130 | ! ------------ |
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| 131 | ! Compute the divergence of the provisional velocity field. Solve the Poisson |
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| 132 | ! equation for the perturbation pressure. Compute the final velocities using |
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| 133 | ! this perturbation pressure. Compute the remaining divergence. |
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| 134 | !------------------------------------------------------------------------------! |
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| 135 | |
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| 136 | USE arrays_3d |
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| 137 | USE constants |
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| 138 | USE control_parameters |
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| 139 | USE cpulog |
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| 140 | USE grid_variables |
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| 141 | USE indices |
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| 142 | USE interfaces |
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| 143 | USE pegrid |
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| 144 | USE poisfft_mod |
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| 145 | USE statistics |
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| 146 | |
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| 147 | IMPLICIT NONE |
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| 148 | |
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[1092] | 149 | INTEGER :: i, j, k |
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[1] | 150 | |
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[673] | 151 | REAL :: ddt_3d, localsum, threadsum, d_weight_pres |
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[1] | 152 | |
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| 153 | REAL, DIMENSION(1:2) :: volume_flow_l, volume_flow_offset |
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[76] | 154 | REAL, DIMENSION(1:nzt) :: w_l, w_l_l |
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[1] | 155 | |
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| 156 | |
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| 157 | CALL cpu_log( log_point(8), 'pres', 'start' ) |
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| 158 | |
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[85] | 159 | |
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| 160 | ddt_3d = 1.0 / dt_3d |
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[709] | 161 | d_weight_pres = 1.0 / weight_pres(intermediate_timestep_count) |
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[85] | 162 | |
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[1] | 163 | ! |
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[707] | 164 | !-- Multigrid method expects array d to have one ghost layer. |
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| 165 | !-- |
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[1] | 166 | IF ( psolver == 'multigrid' ) THEN |
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[667] | 167 | |
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[1] | 168 | DEALLOCATE( d ) |
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[667] | 169 | ALLOCATE( d(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1) ) |
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[707] | 170 | |
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| 171 | ! |
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| 172 | !-- Since p is later used to hold the weighted average of the substeps, it |
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| 173 | !-- cannot be used in the iterative solver. Therefore, its initial value is |
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| 174 | !-- stored on p_loc, which is then iteratively advanced in every substep. |
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| 175 | IF ( intermediate_timestep_count == 1 ) THEN |
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| 176 | DO i = nxl-1, nxr+1 |
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| 177 | DO j = nys-1, nyn+1 |
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| 178 | DO k = nzb, nzt+1 |
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| 179 | p_loc(k,j,i) = p(k,j,i) |
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| 180 | ENDDO |
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| 181 | ENDDO |
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| 182 | ENDDO |
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[667] | 183 | ENDIF |
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| 184 | |
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[707] | 185 | ELSEIF ( psolver == 'sor' .AND. intermediate_timestep_count == 1 ) THEN |
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| 186 | |
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| 187 | ! |
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| 188 | !-- Since p is later used to hold the weighted average of the substeps, it |
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| 189 | !-- cannot be used in the iterative solver. Therefore, its initial value is |
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| 190 | !-- stored on p_loc, which is then iteratively advanced in every substep. |
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| 191 | p_loc = p |
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| 192 | |
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[1] | 193 | ENDIF |
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| 194 | |
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| 195 | ! |
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[75] | 196 | !-- Conserve the volume flow at the outflow in case of non-cyclic lateral |
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| 197 | !-- boundary conditions |
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[106] | 198 | !-- WARNING: so far, this conservation does not work at the left/south |
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| 199 | !-- boundary if the topography at the inflow differs from that at the |
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| 200 | !-- outflow! For this case, volume_flow_area needs adjustment! |
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| 201 | ! |
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| 202 | !-- Left/right |
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[709] | 203 | IF ( conserve_volume_flow .AND. ( outflow_l .OR. outflow_r ) ) THEN |
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[680] | 204 | |
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[106] | 205 | volume_flow(1) = 0.0 |
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| 206 | volume_flow_l(1) = 0.0 |
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| 207 | |
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| 208 | IF ( outflow_l ) THEN |
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| 209 | i = 0 |
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| 210 | ELSEIF ( outflow_r ) THEN |
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| 211 | i = nx+1 |
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| 212 | ENDIF |
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| 213 | |
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| 214 | DO j = nys, nyn |
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| 215 | ! |
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| 216 | !-- Sum up the volume flow through the south/north boundary |
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[709] | 217 | DO k = nzb_2d(j,i)+1, nzt |
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[667] | 218 | volume_flow_l(1) = volume_flow_l(1) + u(k,j,i) * dzw(k) |
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[106] | 219 | ENDDO |
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| 220 | ENDDO |
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| 221 | |
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| 222 | #if defined( __parallel ) |
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[680] | 223 | IF ( collective_wait ) CALL MPI_BARRIER( comm1dy, ierr ) |
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[106] | 224 | CALL MPI_ALLREDUCE( volume_flow_l(1), volume_flow(1), 1, MPI_REAL, & |
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| 225 | MPI_SUM, comm1dy, ierr ) |
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| 226 | #else |
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| 227 | volume_flow = volume_flow_l |
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| 228 | #endif |
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[709] | 229 | volume_flow_offset(1) = ( volume_flow_initial(1) - volume_flow(1) ) & |
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[106] | 230 | / volume_flow_area(1) |
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| 231 | |
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[667] | 232 | DO j = nysg, nyng |
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[709] | 233 | DO k = nzb_2d(j,i)+1, nzt |
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[106] | 234 | u(k,j,i) = u(k,j,i) + volume_flow_offset(1) |
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| 235 | ENDDO |
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| 236 | ENDDO |
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| 237 | |
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| 238 | ENDIF |
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| 239 | |
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| 240 | ! |
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| 241 | !-- South/north |
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[709] | 242 | IF ( conserve_volume_flow .AND. ( outflow_n .OR. outflow_s ) ) THEN |
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[106] | 243 | |
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[75] | 244 | volume_flow(2) = 0.0 |
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| 245 | volume_flow_l(2) = 0.0 |
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| 246 | |
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[106] | 247 | IF ( outflow_s ) THEN |
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| 248 | j = 0 |
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| 249 | ELSEIF ( outflow_n ) THEN |
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[75] | 250 | j = ny+1 |
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[106] | 251 | ENDIF |
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| 252 | |
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| 253 | DO i = nxl, nxr |
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[75] | 254 | ! |
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[106] | 255 | !-- Sum up the volume flow through the south/north boundary |
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[709] | 256 | DO k = nzb_2d(j,i)+1, nzt |
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[667] | 257 | volume_flow_l(2) = volume_flow_l(2) + v(k,j,i) * dzw(k) |
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[75] | 258 | ENDDO |
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[106] | 259 | ENDDO |
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| 260 | |
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[75] | 261 | #if defined( __parallel ) |
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[680] | 262 | IF ( collective_wait ) CALL MPI_BARRIER( comm1dx, ierr ) |
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[75] | 263 | CALL MPI_ALLREDUCE( volume_flow_l(2), volume_flow(2), 1, MPI_REAL, & |
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| 264 | MPI_SUM, comm1dx, ierr ) |
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| 265 | #else |
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| 266 | volume_flow = volume_flow_l |
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| 267 | #endif |
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| 268 | volume_flow_offset(2) = ( volume_flow_initial(2) - volume_flow(2) ) & |
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[106] | 269 | / volume_flow_area(2) |
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[75] | 270 | |
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[667] | 271 | DO i = nxlg, nxrg |
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[709] | 272 | DO k = nzb_v_inner(j,i)+1, nzt |
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[106] | 273 | v(k,j,i) = v(k,j,i) + volume_flow_offset(2) |
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[75] | 274 | ENDDO |
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[106] | 275 | ENDDO |
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[75] | 276 | |
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| 277 | ENDIF |
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| 278 | |
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[76] | 279 | ! |
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| 280 | !-- Remove mean vertical velocity |
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| 281 | IF ( ibc_p_b == 1 .AND. ibc_p_t == 1 ) THEN |
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[709] | 282 | IF ( simulated_time > 0.0 ) THEN ! otherwise nzb_w_inner not yet known |
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[76] | 283 | w_l = 0.0; w_l_l = 0.0 |
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| 284 | DO i = nxl, nxr |
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| 285 | DO j = nys, nyn |
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| 286 | DO k = nzb_w_inner(j,i)+1, nzt |
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| 287 | w_l_l(k) = w_l_l(k) + w(k,j,i) |
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| 288 | ENDDO |
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| 289 | ENDDO |
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| 290 | ENDDO |
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| 291 | #if defined( __parallel ) |
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[622] | 292 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
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[709] | 293 | CALL MPI_ALLREDUCE( w_l_l(1), w_l(1), nzt, MPI_REAL, MPI_SUM, & |
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| 294 | comm2d, ierr ) |
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[76] | 295 | #else |
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| 296 | w_l = w_l_l |
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| 297 | #endif |
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| 298 | DO k = 1, nzt |
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| 299 | w_l(k) = w_l(k) / ngp_2dh_outer(k,0) |
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| 300 | ENDDO |
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[667] | 301 | DO i = nxlg, nxrg |
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| 302 | DO j = nysg, nyng |
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[76] | 303 | DO k = nzb_w_inner(j,i)+1, nzt |
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| 304 | w(k,j,i) = w(k,j,i) - w_l(k) |
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| 305 | ENDDO |
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| 306 | ENDDO |
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| 307 | ENDDO |
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| 308 | ENDIF |
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| 309 | ENDIF |
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[75] | 310 | |
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| 311 | ! |
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[1] | 312 | !-- Compute the divergence of the provisional velocity field. |
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| 313 | CALL cpu_log( log_point_s(1), 'divergence', 'start' ) |
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| 314 | |
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| 315 | IF ( psolver == 'multigrid' ) THEN |
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| 316 | !$OMP PARALLEL DO SCHEDULE( STATIC ) |
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| 317 | DO i = nxl-1, nxr+1 |
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| 318 | DO j = nys-1, nyn+1 |
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| 319 | DO k = nzb, nzt+1 |
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| 320 | d(k,j,i) = 0.0 |
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| 321 | ENDDO |
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| 322 | ENDDO |
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| 323 | ENDDO |
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| 324 | ELSE |
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| 325 | !$OMP PARALLEL DO SCHEDULE( STATIC ) |
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[1111] | 326 | !$acc kernels present( d ) |
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[1003] | 327 | DO i = nxl, nxr |
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| 328 | DO j = nys, nyn |
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| 329 | DO k = nzb+1, nzt |
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[1] | 330 | d(k,j,i) = 0.0 |
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| 331 | ENDDO |
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| 332 | ENDDO |
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| 333 | ENDDO |
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[1111] | 334 | !$acc end kernels |
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[1] | 335 | ENDIF |
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| 336 | |
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| 337 | localsum = 0.0 |
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| 338 | threadsum = 0.0 |
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| 339 | |
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| 340 | #if defined( __ibm ) |
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| 341 | !$OMP PARALLEL PRIVATE (i,j,k) FIRSTPRIVATE(threadsum) REDUCTION(+:localsum) |
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| 342 | !$OMP DO SCHEDULE( STATIC ) |
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| 343 | DO i = nxl, nxr |
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| 344 | DO j = nys, nyn |
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| 345 | DO k = nzb_s_inner(j,i)+1, nzt |
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[85] | 346 | d(k,j,i) = ( ( u(k,j,i+1) - u(k,j,i) ) * ddx + & |
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| 347 | ( v(k,j+1,i) - v(k,j,i) ) * ddy + & |
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[673] | 348 | ( w(k,j,i) - w(k-1,j,i) ) * ddzw(k) ) * ddt_3d & |
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| 349 | * d_weight_pres |
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[1] | 350 | ENDDO |
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| 351 | ! |
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| 352 | !-- Compute possible PE-sum of divergences for flow_statistics |
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| 353 | DO k = nzb_s_inner(j,i)+1, nzt |
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| 354 | threadsum = threadsum + ABS( d(k,j,i) ) |
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| 355 | ENDDO |
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| 356 | |
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| 357 | ENDDO |
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| 358 | ENDDO |
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| 359 | |
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[707] | 360 | localsum = localsum + threadsum * dt_3d * & |
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| 361 | weight_pres(intermediate_timestep_count) |
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[693] | 362 | |
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[1] | 363 | !$OMP END PARALLEL |
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| 364 | #else |
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| 365 | |
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[1111] | 366 | !$OMP PARALLEL PRIVATE (i,j,k) |
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| 367 | !$OMP DO SCHEDULE( STATIC ) |
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[1221] | 368 | !$acc kernels present( d, ddzw, rflags_s_inner, u, v, w ) |
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| 369 | !$acc loop collapse( 3 ) |
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[1111] | 370 | DO i = nxl, nxr |
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| 371 | DO j = nys, nyn |
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| 372 | DO k = 1, nzt |
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[1221] | 373 | d(k,j,i) = ( ( u(k,j,i+1) - u(k,j,i) ) * ddx + & |
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| 374 | ( v(k,j+1,i) - v(k,j,i) ) * ddy + & |
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| 375 | ( w(k,j,i) - w(k-1,j,i) ) * ddzw(k) ) * ddt_3d & |
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| 376 | * d_weight_pres * rflags_s_inner(k,j,i) |
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[1] | 377 | ENDDO |
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| 378 | ENDDO |
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[1111] | 379 | ENDDO |
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| 380 | !$acc end kernels |
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| 381 | !$OMP END PARALLEL |
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[1] | 382 | |
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| 383 | ! |
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| 384 | !-- Compute possible PE-sum of divergences for flow_statistics |
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| 385 | !$OMP PARALLEL PRIVATE (i,j,k) FIRSTPRIVATE(threadsum) REDUCTION(+:localsum) |
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| 386 | !$OMP DO SCHEDULE( STATIC ) |
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[1221] | 387 | !$acc parallel loop collapse(3) present( d ) reduction(+:threadsum) |
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[1] | 388 | DO i = nxl, nxr |
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| 389 | DO j = nys, nyn |
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| 390 | DO k = nzb+1, nzt |
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| 391 | threadsum = threadsum + ABS( d(k,j,i) ) |
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| 392 | ENDDO |
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| 393 | ENDDO |
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| 394 | ENDDO |
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[1257] | 395 | !$acc end parallel loop |
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[707] | 396 | localsum = localsum + threadsum * dt_3d * & |
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| 397 | weight_pres(intermediate_timestep_count) |
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[1] | 398 | !$OMP END PARALLEL |
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| 399 | #endif |
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| 400 | |
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| 401 | ! |
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| 402 | !-- For completeness, set the divergence sum of all statistic regions to those |
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| 403 | !-- of the total domain |
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| 404 | sums_divold_l(0:statistic_regions) = localsum |
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| 405 | |
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| 406 | CALL cpu_log( log_point_s(1), 'divergence', 'stop' ) |
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| 407 | |
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| 408 | ! |
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| 409 | !-- Compute the pressure perturbation solving the Poisson equation |
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| 410 | IF ( psolver(1:7) == 'poisfft' ) THEN |
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| 411 | |
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| 412 | ! |
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| 413 | !-- Solve Poisson equation via FFT and solution of tridiagonal matrices |
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| 414 | IF ( psolver == 'poisfft' ) THEN |
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[1212] | 415 | |
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[1] | 416 | CALL poisfft( d, tend ) |
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[1113] | 417 | |
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[1] | 418 | ENDIF |
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| 419 | |
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| 420 | ! |
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| 421 | !-- Store computed perturbation pressure and set boundary condition in |
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| 422 | !-- z-direction |
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| 423 | !$OMP PARALLEL DO |
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[1113] | 424 | !$acc kernels present( d, tend ) |
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[1] | 425 | DO i = nxl, nxr |
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| 426 | DO j = nys, nyn |
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| 427 | DO k = nzb+1, nzt |
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| 428 | tend(k,j,i) = d(k,j,i) |
---|
| 429 | ENDDO |
---|
| 430 | ENDDO |
---|
| 431 | ENDDO |
---|
[1113] | 432 | !$acc end kernels |
---|
[1] | 433 | |
---|
| 434 | ! |
---|
| 435 | !-- Bottom boundary: |
---|
| 436 | !-- This condition is only required for internal output. The pressure |
---|
| 437 | !-- gradient (dp(nzb+1)-dp(nzb))/dz is not used anywhere else. |
---|
| 438 | IF ( ibc_p_b == 1 ) THEN |
---|
| 439 | ! |
---|
| 440 | !-- Neumann (dp/dz = 0) |
---|
| 441 | !$OMP PARALLEL DO |
---|
[1113] | 442 | !$acc kernels present( nzb_s_inner, tend ) |
---|
[667] | 443 | DO i = nxlg, nxrg |
---|
| 444 | DO j = nysg, nyng |
---|
[1] | 445 | tend(nzb_s_inner(j,i),j,i) = tend(nzb_s_inner(j,i)+1,j,i) |
---|
| 446 | ENDDO |
---|
| 447 | ENDDO |
---|
[1113] | 448 | !$acc end kernels |
---|
[1] | 449 | |
---|
| 450 | ELSE |
---|
| 451 | ! |
---|
| 452 | !-- Dirichlet |
---|
| 453 | !$OMP PARALLEL DO |
---|
[1113] | 454 | !$acc kernels present( tend ) |
---|
[667] | 455 | DO i = nxlg, nxrg |
---|
| 456 | DO j = nysg, nyng |
---|
[1] | 457 | tend(nzb_s_inner(j,i),j,i) = 0.0 |
---|
| 458 | ENDDO |
---|
| 459 | ENDDO |
---|
[1113] | 460 | !$acc end kernels |
---|
[1] | 461 | |
---|
| 462 | ENDIF |
---|
| 463 | |
---|
| 464 | ! |
---|
| 465 | !-- Top boundary |
---|
| 466 | IF ( ibc_p_t == 1 ) THEN |
---|
| 467 | ! |
---|
| 468 | !-- Neumann |
---|
| 469 | !$OMP PARALLEL DO |
---|
[1113] | 470 | !$acc kernels present( tend ) |
---|
[667] | 471 | DO i = nxlg, nxrg |
---|
| 472 | DO j = nysg, nyng |
---|
[1] | 473 | tend(nzt+1,j,i) = tend(nzt,j,i) |
---|
| 474 | ENDDO |
---|
| 475 | ENDDO |
---|
[1113] | 476 | !$acc end kernels |
---|
[1] | 477 | |
---|
| 478 | ELSE |
---|
| 479 | ! |
---|
| 480 | !-- Dirichlet |
---|
| 481 | !$OMP PARALLEL DO |
---|
[1113] | 482 | !$acc kernels present( tend ) |
---|
[667] | 483 | DO i = nxlg, nxrg |
---|
| 484 | DO j = nysg, nyng |
---|
[1] | 485 | tend(nzt+1,j,i) = 0.0 |
---|
| 486 | ENDDO |
---|
| 487 | ENDDO |
---|
[1113] | 488 | !$acc end kernels |
---|
[1] | 489 | |
---|
| 490 | ENDIF |
---|
| 491 | |
---|
| 492 | ! |
---|
| 493 | !-- Exchange boundaries for p |
---|
[1113] | 494 | IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs |
---|
| 495 | on_device = .TRUE. ! to be removed after complete porting |
---|
| 496 | ELSE ! of ghost point exchange |
---|
| 497 | !$acc update host( tend ) |
---|
| 498 | ENDIF |
---|
[667] | 499 | CALL exchange_horiz( tend, nbgp ) |
---|
[1113] | 500 | IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs |
---|
| 501 | on_device = .FALSE. ! to be removed after complete porting |
---|
| 502 | ELSE ! of ghost point exchange |
---|
| 503 | !$acc update device( tend ) |
---|
| 504 | ENDIF |
---|
[1] | 505 | |
---|
| 506 | ELSEIF ( psolver == 'sor' ) THEN |
---|
| 507 | |
---|
| 508 | ! |
---|
| 509 | !-- Solve Poisson equation for perturbation pressure using SOR-Red/Black |
---|
| 510 | !-- scheme |
---|
[707] | 511 | CALL sor( d, ddzu_pres, ddzw, p_loc ) |
---|
| 512 | tend = p_loc |
---|
[1] | 513 | |
---|
| 514 | ELSEIF ( psolver == 'multigrid' ) THEN |
---|
| 515 | |
---|
| 516 | ! |
---|
| 517 | !-- Solve Poisson equation for perturbation pressure using Multigrid scheme, |
---|
[667] | 518 | !-- array tend is used to store the residuals, logical exchange_mg is used |
---|
| 519 | !-- to discern data exchange in multigrid ( 1 ghostpoint ) and normal grid |
---|
| 520 | !-- ( nbgp ghost points ). |
---|
[778] | 521 | |
---|
| 522 | !-- If the number of grid points of the gathered grid, which is collected |
---|
| 523 | !-- on PE0, is larger than the number of grid points of an PE, than array |
---|
| 524 | !-- tend will be enlarged. |
---|
| 525 | IF ( gathered_size > subdomain_size ) THEN |
---|
| 526 | DEALLOCATE( tend ) |
---|
| 527 | ALLOCATE( tend(nzb:nzt_mg(mg_switch_to_pe0_level)+1,nys_mg( & |
---|
| 528 | mg_switch_to_pe0_level)-1:nyn_mg(mg_switch_to_pe0_level)+1,& |
---|
| 529 | nxl_mg(mg_switch_to_pe0_level)-1:nxr_mg( & |
---|
| 530 | mg_switch_to_pe0_level)+1) ) |
---|
| 531 | ENDIF |
---|
| 532 | |
---|
[1] | 533 | CALL poismg( tend ) |
---|
[707] | 534 | |
---|
[778] | 535 | IF ( gathered_size > subdomain_size ) THEN |
---|
| 536 | DEALLOCATE( tend ) |
---|
| 537 | ALLOCATE( tend(nzb:nzt+1,nysg:nyng,nxlg:nxrg) ) |
---|
| 538 | ENDIF |
---|
| 539 | |
---|
[1] | 540 | ! |
---|
| 541 | !-- Restore perturbation pressure on tend because this array is used |
---|
| 542 | !-- further below to correct the velocity fields |
---|
[707] | 543 | DO i = nxl-1, nxr+1 |
---|
| 544 | DO j = nys-1, nyn+1 |
---|
| 545 | DO k = nzb, nzt+1 |
---|
| 546 | tend(k,j,i) = p_loc(k,j,i) |
---|
| 547 | ENDDO |
---|
| 548 | ENDDO |
---|
| 549 | ENDDO |
---|
[667] | 550 | |
---|
[1] | 551 | ENDIF |
---|
| 552 | |
---|
| 553 | ! |
---|
[707] | 554 | !-- Store perturbation pressure on array p, used for pressure data output. |
---|
| 555 | !-- Ghost layers are added in the output routines (except sor-method: see below) |
---|
| 556 | IF ( intermediate_timestep_count == 1 ) THEN |
---|
| 557 | !$OMP PARALLEL PRIVATE (i,j,k) |
---|
| 558 | !$OMP DO |
---|
[1113] | 559 | !$acc kernels present( p, tend, weight_substep ) |
---|
[1257] | 560 | !$acc loop independent |
---|
[707] | 561 | DO i = nxl-1, nxr+1 |
---|
[1257] | 562 | !$acc loop independent |
---|
[707] | 563 | DO j = nys-1, nyn+1 |
---|
[1257] | 564 | !$acc loop independent |
---|
[707] | 565 | DO k = nzb, nzt+1 |
---|
| 566 | p(k,j,i) = tend(k,j,i) * & |
---|
| 567 | weight_substep(intermediate_timestep_count) |
---|
[673] | 568 | ENDDO |
---|
[1] | 569 | ENDDO |
---|
[707] | 570 | ENDDO |
---|
[1113] | 571 | !$acc end kernels |
---|
[707] | 572 | !$OMP END PARALLEL |
---|
| 573 | |
---|
| 574 | ELSE |
---|
| 575 | !$OMP PARALLEL PRIVATE (i,j,k) |
---|
| 576 | !$OMP DO |
---|
[1113] | 577 | !$acc kernels present( p, tend, weight_substep ) |
---|
[1257] | 578 | !$acc loop independent |
---|
[707] | 579 | DO i = nxl-1, nxr+1 |
---|
[1257] | 580 | !$acc loop independent |
---|
[707] | 581 | DO j = nys-1, nyn+1 |
---|
[1257] | 582 | !$acc loop independent |
---|
[707] | 583 | DO k = nzb, nzt+1 |
---|
| 584 | p(k,j,i) = p(k,j,i) + tend(k,j,i) * & |
---|
| 585 | weight_substep(intermediate_timestep_count) |
---|
[673] | 586 | ENDDO |
---|
| 587 | ENDDO |
---|
[707] | 588 | ENDDO |
---|
[1113] | 589 | !$acc end kernels |
---|
[707] | 590 | !$OMP END PARALLEL |
---|
| 591 | |
---|
| 592 | ENDIF |
---|
[673] | 593 | |
---|
[707] | 594 | ! |
---|
| 595 | !-- SOR-method needs ghost layers for the next timestep |
---|
| 596 | IF ( psolver == 'sor' ) CALL exchange_horiz( p, nbgp ) |
---|
[682] | 597 | |
---|
[1] | 598 | ! |
---|
| 599 | !-- Correction of the provisional velocities with the current perturbation |
---|
| 600 | !-- pressure just computed |
---|
[709] | 601 | IF ( conserve_volume_flow .AND. ( bc_lr_cyc .OR. bc_ns_cyc ) ) THEN |
---|
[1] | 602 | volume_flow_l(1) = 0.0 |
---|
| 603 | volume_flow_l(2) = 0.0 |
---|
| 604 | ENDIF |
---|
[707] | 605 | |
---|
[1] | 606 | !$OMP PARALLEL PRIVATE (i,j,k) |
---|
| 607 | !$OMP DO |
---|
[1113] | 608 | !$acc kernels present( ddzu, nzb_u_inner, nzb_v_inner, nzb_w_inner, tend, u, v, w, weight_pres ) |
---|
[1257] | 609 | !$acc loop independent |
---|
[673] | 610 | DO i = nxl, nxr |
---|
[1257] | 611 | !$acc loop independent |
---|
[1] | 612 | DO j = nys, nyn |
---|
[1257] | 613 | !$acc loop independent |
---|
[1113] | 614 | DO k = 1, nzt |
---|
| 615 | IF ( k > nzb_w_inner(j,i) ) THEN |
---|
| 616 | w(k,j,i) = w(k,j,i) - dt_3d * & |
---|
| 617 | ( tend(k+1,j,i) - tend(k,j,i) ) * ddzu(k+1) * & |
---|
| 618 | weight_pres(intermediate_timestep_count) |
---|
| 619 | ENDIF |
---|
[1] | 620 | ENDDO |
---|
[1257] | 621 | !$acc loop independent |
---|
[1113] | 622 | DO k = 1, nzt |
---|
| 623 | IF ( k > nzb_u_inner(j,i) ) THEN |
---|
| 624 | u(k,j,i) = u(k,j,i) - dt_3d * & |
---|
| 625 | ( tend(k,j,i) - tend(k,j,i-1) ) * ddx * & |
---|
| 626 | weight_pres(intermediate_timestep_count) |
---|
| 627 | ENDIF |
---|
[1] | 628 | ENDDO |
---|
[1257] | 629 | !$acc loop independent |
---|
[1113] | 630 | DO k = 1, nzt |
---|
| 631 | IF ( k > nzb_v_inner(j,i) ) THEN |
---|
| 632 | v(k,j,i) = v(k,j,i) - dt_3d * & |
---|
| 633 | ( tend(k,j,i) - tend(k,j-1,i) ) * ddy * & |
---|
| 634 | weight_pres(intermediate_timestep_count) |
---|
| 635 | ENDIF |
---|
[673] | 636 | ENDDO |
---|
[1] | 637 | |
---|
| 638 | ENDDO |
---|
| 639 | ENDDO |
---|
[1113] | 640 | !$acc end kernels |
---|
[1] | 641 | !$OMP END PARALLEL |
---|
[1113] | 642 | |
---|
| 643 | ! |
---|
| 644 | !-- Sum up the volume flow through the right and north boundary |
---|
| 645 | IF ( conserve_volume_flow .AND. bc_lr_cyc .AND. bc_ns_cyc .AND. & |
---|
| 646 | nxr == nx ) THEN |
---|
| 647 | |
---|
| 648 | !$OMP PARALLEL PRIVATE (j,k) |
---|
| 649 | !$OMP DO |
---|
| 650 | DO j = nys, nyn |
---|
| 651 | !$OMP CRITICAL |
---|
| 652 | DO k = nzb_2d(j,nx) + 1, nzt |
---|
| 653 | volume_flow_l(1) = volume_flow_l(1) + u(k,j,nx) * dzw(k) |
---|
| 654 | ENDDO |
---|
| 655 | !$OMP END CRITICAL |
---|
| 656 | ENDDO |
---|
| 657 | !$OMP END PARALLEL |
---|
| 658 | |
---|
| 659 | ENDIF |
---|
| 660 | |
---|
| 661 | IF ( conserve_volume_flow .AND. bc_ns_cyc .AND. bc_lr_cyc .AND. & |
---|
| 662 | nyn == ny ) THEN |
---|
| 663 | |
---|
| 664 | !$OMP PARALLEL PRIVATE (i,k) |
---|
| 665 | !$OMP DO |
---|
| 666 | DO i = nxl, nxr |
---|
| 667 | !$OMP CRITICAL |
---|
| 668 | DO k = nzb_2d(ny,i) + 1, nzt |
---|
| 669 | volume_flow_l(2) = volume_flow_l(2) + v(k,ny,i) * dzw(k) |
---|
| 670 | ENDDO |
---|
| 671 | !$OMP END CRITICAL |
---|
| 672 | ENDDO |
---|
| 673 | !$OMP END PARALLEL |
---|
| 674 | |
---|
| 675 | ENDIF |
---|
[673] | 676 | |
---|
[1] | 677 | ! |
---|
| 678 | !-- Conserve the volume flow |
---|
[707] | 679 | IF ( conserve_volume_flow .AND. ( bc_lr_cyc .AND. bc_ns_cyc ) ) THEN |
---|
[1] | 680 | |
---|
| 681 | #if defined( __parallel ) |
---|
[622] | 682 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
---|
[1] | 683 | CALL MPI_ALLREDUCE( volume_flow_l(1), volume_flow(1), 2, MPI_REAL, & |
---|
| 684 | MPI_SUM, comm2d, ierr ) |
---|
| 685 | #else |
---|
| 686 | volume_flow = volume_flow_l |
---|
| 687 | #endif |
---|
| 688 | |
---|
| 689 | volume_flow_offset = ( volume_flow_initial - volume_flow ) / & |
---|
| 690 | volume_flow_area |
---|
| 691 | |
---|
| 692 | !$OMP PARALLEL PRIVATE (i,j,k) |
---|
| 693 | !$OMP DO |
---|
| 694 | DO i = nxl, nxr |
---|
| 695 | DO j = nys, nyn |
---|
[667] | 696 | DO k = nzb_u_inner(j,i) + 1, nzt |
---|
| 697 | u(k,j,i) = u(k,j,i) + volume_flow_offset(1) |
---|
[719] | 698 | ENDDO |
---|
| 699 | DO k = nzb_v_inner(j,i) + 1, nzt |
---|
[667] | 700 | v(k,j,i) = v(k,j,i) + volume_flow_offset(2) |
---|
| 701 | ENDDO |
---|
[1] | 702 | ENDDO |
---|
| 703 | ENDDO |
---|
[667] | 704 | |
---|
[1] | 705 | !$OMP END PARALLEL |
---|
| 706 | |
---|
| 707 | ENDIF |
---|
| 708 | |
---|
| 709 | ! |
---|
| 710 | !-- Exchange of boundaries for the velocities |
---|
[1113] | 711 | IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs |
---|
| 712 | on_device = .TRUE. ! to be removed after complete porting |
---|
| 713 | ELSE ! of ghost point exchange |
---|
| 714 | !$acc update host( u, v, w ) |
---|
| 715 | ENDIF |
---|
[667] | 716 | CALL exchange_horiz( u, nbgp ) |
---|
| 717 | CALL exchange_horiz( v, nbgp ) |
---|
| 718 | CALL exchange_horiz( w, nbgp ) |
---|
[1113] | 719 | IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs |
---|
| 720 | on_device = .FALSE. ! to be removed after complete porting |
---|
| 721 | ELSE ! of ghost point exchange |
---|
| 722 | !$acc update device( u, v, w ) |
---|
| 723 | ENDIF |
---|
[1] | 724 | |
---|
| 725 | ! |
---|
| 726 | !-- Compute the divergence of the corrected velocity field, |
---|
| 727 | !-- a possible PE-sum is computed in flow_statistics |
---|
| 728 | CALL cpu_log( log_point_s(1), 'divergence', 'start' ) |
---|
| 729 | sums_divnew_l = 0.0 |
---|
| 730 | |
---|
| 731 | ! |
---|
| 732 | !-- d must be reset to zero because it can contain nonzero values below the |
---|
| 733 | !-- topography |
---|
| 734 | IF ( topography /= 'flat' ) d = 0.0 |
---|
| 735 | |
---|
| 736 | localsum = 0.0 |
---|
| 737 | threadsum = 0.0 |
---|
| 738 | |
---|
| 739 | !$OMP PARALLEL PRIVATE (i,j,k) FIRSTPRIVATE(threadsum) REDUCTION(+:localsum) |
---|
| 740 | !$OMP DO SCHEDULE( STATIC ) |
---|
| 741 | #if defined( __ibm ) |
---|
| 742 | DO i = nxl, nxr |
---|
| 743 | DO j = nys, nyn |
---|
| 744 | DO k = nzb_s_inner(j,i)+1, nzt |
---|
| 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 | ENDDO |
---|
| 749 | DO k = nzb+1, nzt |
---|
| 750 | threadsum = threadsum + ABS( d(k,j,i) ) |
---|
| 751 | ENDDO |
---|
| 752 | ENDDO |
---|
| 753 | ENDDO |
---|
| 754 | #else |
---|
[1221] | 755 | !$acc kernels present( d, ddzw, rflags_s_inner, u, v, w ) |
---|
| 756 | !$acc loop collapse( 3 ) |
---|
[1] | 757 | DO i = nxl, nxr |
---|
| 758 | DO j = nys, nyn |
---|
[1113] | 759 | DO k = 1, nzt |
---|
[1221] | 760 | d(k,j,i) = ( ( u(k,j,i+1) - u(k,j,i) ) * ddx + & |
---|
| 761 | ( v(k,j+1,i) - v(k,j,i) ) * ddy + & |
---|
| 762 | ( w(k,j,i) - w(k-1,j,i) ) * ddzw(k) & |
---|
| 763 | ) * rflags_s_inner(k,j,i) |
---|
[1113] | 764 | ENDDO |
---|
| 765 | ENDDO |
---|
| 766 | ENDDO |
---|
| 767 | !$acc end kernels |
---|
| 768 | ! |
---|
| 769 | !-- Compute possible PE-sum of divergences for flow_statistics |
---|
[1221] | 770 | !$acc parallel loop collapse(3) present( d ) reduction(+:threadsum) |
---|
[1113] | 771 | DO i = nxl, nxr |
---|
| 772 | DO j = nys, nyn |
---|
[1221] | 773 | DO k = nzb+1, nzt |
---|
[1] | 774 | threadsum = threadsum + ABS( d(k,j,i) ) |
---|
| 775 | ENDDO |
---|
| 776 | ENDDO |
---|
| 777 | ENDDO |
---|
[1257] | 778 | !$acc end parallel loop |
---|
[1] | 779 | #endif |
---|
[667] | 780 | |
---|
[1] | 781 | localsum = localsum + threadsum |
---|
| 782 | !$OMP END PARALLEL |
---|
| 783 | |
---|
| 784 | ! |
---|
| 785 | !-- For completeness, set the divergence sum of all statistic regions to those |
---|
| 786 | !-- of the total domain |
---|
| 787 | sums_divnew_l(0:statistic_regions) = localsum |
---|
| 788 | |
---|
| 789 | CALL cpu_log( log_point_s(1), 'divergence', 'stop' ) |
---|
| 790 | |
---|
| 791 | CALL cpu_log( log_point(8), 'pres', 'stop' ) |
---|
| 792 | |
---|
| 793 | |
---|
| 794 | END SUBROUTINE pres |
---|