| 1 | SUBROUTINE sor( d, ddzu, ddzw, p ) |
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| 2 | |
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| 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 1997-2014 Leibniz Universitaet Hannover |
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| 18 | !--------------------------------------------------------------------------------! |
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| 19 | ! |
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| 20 | ! Current revisions: |
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| 21 | ! ----------------- |
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| 22 | ! ONLY-attribute added to USE-statements, |
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| 23 | ! kind-parameters added to all INTEGER and REAL declaration statements, |
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| 24 | ! kinds are defined in new module kinds, |
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| 25 | ! old module precision_kind is removed, |
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| 26 | ! revision history before 2012 removed, |
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| 27 | ! comment fields (!:) to be used for variable explanations added to |
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| 28 | ! all variable declaration statements |
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| 29 | ! |
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| 30 | ! Former revisions: |
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| 31 | ! ----------------- |
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| 32 | ! $Id: sor.f90 1320 2014-03-20 08:40:49Z raasch $ |
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| 33 | ! |
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| 34 | ! 1036 2012-10-22 13:43:42Z raasch |
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| 35 | ! code put under GPL (PALM 3.9) |
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| 36 | ! |
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| 37 | ! Revision 1.1 1997/08/11 06:25:56 raasch |
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| 38 | ! Initial revision |
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| 39 | ! |
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| 40 | ! |
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| 41 | ! Description: |
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| 42 | ! ------------ |
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| 43 | ! Solve the Poisson-equation with the SOR-Red/Black-scheme. |
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| 44 | !------------------------------------------------------------------------------! |
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| 45 | |
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| 46 | USE grid_variables, & |
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| 47 | ONLY: ddx2, ddy2 |
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| 48 | |
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| 49 | USE indices, & |
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| 50 | ONLY: nbgp, nxl, nxlg, nxr, nxrg, nyn, nyng, nys, nysg, nz, nzb, nzt |
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| 51 | |
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| 52 | USE kinds |
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| 53 | |
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| 54 | USE control_parameters, & |
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| 55 | ONLY: bc_lr_cyc, bc_ns_cyc, ibc_p_b, ibc_p_t, inflow_l, inflow_n, & |
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| 56 | inflow_r, inflow_s, n_sor, omega_sor, outflow_l, outflow_n, & |
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| 57 | outflow_r, outflow_s |
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| 58 | |
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| 59 | IMPLICIT NONE |
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| 60 | |
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| 61 | INTEGER(iwp) :: i !: |
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| 62 | INTEGER(iwp) :: j !: |
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| 63 | INTEGER(iwp) :: k !: |
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| 64 | INTEGER(iwp) :: n !: |
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| 65 | INTEGER(iwp) :: nxl1 !: |
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| 66 | INTEGER(iwp) :: nxl2 !: |
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| 67 | INTEGER(iwp) :: nys1 !: |
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| 68 | INTEGER(iwp) :: nys2 !: |
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| 69 | |
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| 70 | REAL(wp) :: ddzu(1:nz+1) !: |
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| 71 | REAL(wp) :: ddzw(1:nzt+1) !: |
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| 72 | |
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| 73 | REAL(wp) :: d(nzb+1:nzt,nys:nyn,nxl:nxr) !: |
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| 74 | REAL(wp) :: p(nzb:nzt+1,nysg:nyng,nxlg:nxrg) !: |
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| 75 | |
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| 76 | REAL(wp), DIMENSION(:), ALLOCATABLE :: f1 !: |
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| 77 | REAL(wp), DIMENSION(:), ALLOCATABLE :: f2 !: |
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| 78 | REAL(wp), DIMENSION(:), ALLOCATABLE :: f3 !: |
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| 79 | |
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| 80 | ALLOCATE( f1(1:nz), f2(1:nz), f3(1:nz) ) |
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| 81 | |
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| 82 | ! |
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| 83 | !-- Compute pre-factors. |
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| 84 | DO k = 1, nz |
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| 85 | f2(k) = ddzu(k+1) * ddzw(k) |
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| 86 | f3(k) = ddzu(k) * ddzw(k) |
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| 87 | f1(k) = 2.0 * ( ddx2 + ddy2 ) + f2(k) + f3(k) |
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| 88 | ENDDO |
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| 89 | |
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| 90 | ! |
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| 91 | !-- Limits for RED- and BLACK-part. |
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| 92 | IF ( MOD( nxl , 2 ) == 0 ) THEN |
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| 93 | nxl1 = nxl |
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| 94 | nxl2 = nxl + 1 |
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| 95 | ELSE |
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| 96 | nxl1 = nxl + 1 |
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| 97 | nxl2 = nxl |
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| 98 | ENDIF |
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| 99 | IF ( MOD( nys , 2 ) == 0 ) THEN |
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| 100 | nys1 = nys |
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| 101 | nys2 = nys + 1 |
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| 102 | ELSE |
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| 103 | nys1 = nys + 1 |
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| 104 | nys2 = nys |
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| 105 | ENDIF |
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| 106 | |
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| 107 | DO n = 1, n_sor |
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| 108 | |
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| 109 | ! |
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| 110 | !-- RED-part |
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| 111 | DO i = nxl1, nxr, 2 |
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| 112 | DO j = nys2, nyn, 2 |
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| 113 | DO k = nzb+1, nzt |
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| 114 | p(k,j,i) = p(k,j,i) + omega_sor / f1(k) * ( & |
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| 115 | ddx2 * ( p(k,j,i+1) + p(k,j,i-1) ) + & |
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| 116 | ddy2 * ( p(k,j+1,i) + p(k,j-1,i) ) + & |
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| 117 | f2(k) * p(k+1,j,i) + & |
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| 118 | f3(k) * p(k-1,j,i) - & |
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| 119 | d(k,j,i) - & |
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| 120 | f1(k) * p(k,j,i) ) |
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| 121 | ENDDO |
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| 122 | ENDDO |
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| 123 | ENDDO |
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| 124 | |
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| 125 | DO i = nxl2, nxr, 2 |
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| 126 | DO j = nys1, nyn, 2 |
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| 127 | DO k = nzb+1, nzt |
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| 128 | p(k,j,i) = p(k,j,i) + omega_sor / f1(k) * ( & |
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| 129 | ddx2 * ( p(k,j,i+1) + p(k,j,i-1) ) + & |
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| 130 | ddy2 * ( p(k,j+1,i) + p(k,j-1,i) ) + & |
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| 131 | f2(k) * p(k+1,j,i) + & |
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| 132 | f3(k) * p(k-1,j,i) - & |
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| 133 | d(k,j,i) - & |
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| 134 | f1(k) * p(k,j,i) ) |
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| 135 | ENDDO |
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| 136 | ENDDO |
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| 137 | ENDDO |
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| 138 | |
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| 139 | ! |
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| 140 | !-- Exchange of boundary values for p. |
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| 141 | CALL exchange_horiz( p, nbgp ) |
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| 142 | |
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| 143 | ! |
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| 144 | !-- Horizontal (Neumann) boundary conditions in case of non-cyclic boundaries |
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| 145 | IF ( .NOT. bc_lr_cyc ) THEN |
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| 146 | IF ( inflow_l .OR. outflow_l ) p(:,:,nxl-1) = p(:,:,nxl) |
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| 147 | IF ( inflow_r .OR. outflow_r ) p(:,:,nxr+1) = p(:,:,nxr) |
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| 148 | ENDIF |
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| 149 | IF ( .NOT. bc_ns_cyc ) THEN |
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| 150 | IF ( inflow_n .OR. outflow_n ) p(:,nyn+1,:) = p(:,nyn,:) |
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| 151 | IF ( inflow_s .OR. outflow_s ) p(:,nys-1,:) = p(:,nys,:) |
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| 152 | ENDIF |
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| 153 | |
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| 154 | ! |
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| 155 | !-- BLACK-part |
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| 156 | DO i = nxl1, nxr, 2 |
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| 157 | DO j = nys1, nyn, 2 |
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| 158 | DO k = nzb+1, nzt |
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| 159 | p(k,j,i) = p(k,j,i) + omega_sor / f1(k) * ( & |
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| 160 | ddx2 * ( p(k,j,i+1) + p(k,j,i-1) ) + & |
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| 161 | ddy2 * ( p(k,j+1,i) + p(k,j-1,i) ) + & |
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| 162 | f2(k) * p(k+1,j,i) + & |
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| 163 | f3(k) * p(k-1,j,i) - & |
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| 164 | d(k,j,i) - & |
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| 165 | f1(k) * p(k,j,i) ) |
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| 166 | ENDDO |
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| 167 | ENDDO |
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| 168 | ENDDO |
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| 169 | |
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| 170 | DO i = nxl2, nxr, 2 |
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| 171 | DO j = nys2, nyn, 2 |
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| 172 | DO k = nzb+1, nzt |
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| 173 | p(k,j,i) = p(k,j,i) + omega_sor / f1(k) * ( & |
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| 174 | ddx2 * ( p(k,j,i+1) + p(k,j,i-1) ) + & |
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| 175 | ddy2 * ( p(k,j+1,i) + p(k,j-1,i) ) + & |
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| 176 | f2(k) * p(k+1,j,i) + & |
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| 177 | f3(k) * p(k-1,j,i) - & |
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| 178 | d(k,j,i) - & |
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| 179 | f1(k) * 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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| 183 | |
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| 184 | ! |
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| 185 | !-- Exchange of boundary values for p. |
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| 186 | CALL exchange_horiz( p, nbgp ) |
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| 187 | |
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| 188 | ! |
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| 189 | !-- Boundary conditions top/bottom. |
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| 190 | !-- Bottom boundary |
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| 191 | IF ( ibc_p_b == 1 ) THEN ! Neumann |
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| 192 | p(nzb,:,:) = p(nzb+1,:,:) |
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| 193 | ELSE ! Dirichlet |
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| 194 | p(nzb,:,:) = 0.0 |
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| 195 | ENDIF |
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| 196 | |
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| 197 | ! |
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| 198 | !-- Top boundary |
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| 199 | IF ( ibc_p_t == 1 ) THEN ! Neumann |
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| 200 | p(nzt+1,:,:) = p(nzt,:,:) |
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| 201 | ELSE ! Dirichlet |
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| 202 | p(nzt+1,:,:) = 0.0 |
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| 203 | ENDIF |
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| 204 | |
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| 205 | ! |
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| 206 | !-- Horizontal (Neumann) boundary conditions in case of non-cyclic boundaries |
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| 207 | IF ( .NOT. bc_lr_cyc ) THEN |
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| 208 | IF ( inflow_l .OR. outflow_l ) p(:,:,nxl-1) = p(:,:,nxl) |
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| 209 | IF ( inflow_r .OR. outflow_r ) p(:,:,nxr+1) = p(:,:,nxr) |
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| 210 | ENDIF |
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| 211 | IF ( .NOT. bc_ns_cyc ) THEN |
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| 212 | IF ( inflow_n .OR. outflow_n ) p(:,nyn+1,:) = p(:,nyn,:) |
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| 213 | IF ( inflow_s .OR. outflow_s ) p(:,nys-1,:) = p(:,nys,:) |
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| 214 | ENDIF |
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| 215 | |
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| 216 | |
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| 217 | ENDDO |
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| 218 | |
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| 219 | DEALLOCATE( f1, f2, f3 ) |
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| 220 | |
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| 221 | END SUBROUTINE sor |
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