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