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source: palm/trunk/SOURCE/sor.f90 @ 1762

Last change on this file since 1762 was 1762, checked in by hellstea, 8 years ago
Introduction of nested domain system
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[1682]	1	!> @file sor.f90
[1036]	2	!--------------------------------------------------------------------------------!
	3	! This file is part of PALM.
	4	!
	5	! PALM is free software: you can redistribute it and/or modify it under the terms
	6	! of the GNU General Public License as published by the Free Software Foundation,
	7	! either version 3 of the License, or (at your option) any later version.
	8	!
	9	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
	10	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
	11	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
	12	!
	13	! You should have received a copy of the GNU General Public License along with
	14	! PALM. If not, see <http://www.gnu.org/licenses/>.
	15	!
[1310]	16	! Copyright 1997-2014 Leibniz Universitaet Hannover
[1036]	17	!--------------------------------------------------------------------------------!
	18	!
[484]	19	! Current revisions:
[1]	20	! -----------------
[1762]	21	! Introduction of nested domain feature
[1354]	22	!
[1321]	23	! Former revisions:
	24	! -----------------
	25	! $Id: sor.f90 1762 2016-02-25 12:31:13Z hellstea $
	26	!
[1683]	27	! 1682 2015-10-07 23:56:08Z knoop
	28	! Code annotations made doxygen readable
	29	!
[1354]	30	! 1353 2014-04-08 15:21:23Z heinze
	31	! REAL constants provided with KIND-attribute
	32	!
[1321]	33	! 1320 2014-03-20 08:40:49Z raasch
[1320]	34	! ONLY-attribute added to USE-statements,
	35	! kind-parameters added to all INTEGER and REAL declaration statements,
	36	! kinds are defined in new module kinds,
	37	! old module precision_kind is removed,
	38	! revision history before 2012 removed,
	39	! comment fields (!:) to be used for variable explanations added to
	40	! all variable declaration statements
[1]	41	!
[1037]	42	! 1036 2012-10-22 13:43:42Z raasch
	43	! code put under GPL (PALM 3.9)
	44	!
[1]	45	! Revision 1.1 1997/08/11 06:25:56 raasch
	46	! Initial revision
	47	!
	48	!
	49	! Description:
	50	! ------------
[1682]	51	!> Solve the Poisson-equation with the SOR-Red/Black-scheme.
[3]	52	!------------------------------------------------------------------------------!
[1682]	53	SUBROUTINE sor( d, ddzu, ddzw, p )
	54
[1]	55
[1320]	56	USE grid_variables, &
	57	ONLY: ddx2, ddy2
[1]	58
[1320]	59	USE indices, &
	60	ONLY: nbgp, nxl, nxlg, nxr, nxrg, nyn, nyng, nys, nysg, nz, nzb, nzt
	61
	62	USE kinds
	63
	64	USE control_parameters, &
	65	ONLY: bc_lr_cyc, bc_ns_cyc, ibc_p_b, ibc_p_t, inflow_l, inflow_n, &
[1762]	66	inflow_r, inflow_s, nest_bound_l, nest_bound_n, nest_bound_r, &
	67	nest_bound_s, n_sor, omega_sor, outflow_l, outflow_n, &
[1320]	68	outflow_r, outflow_s
	69
[1]	70	IMPLICIT NONE
	71
[1682]	72	INTEGER(iwp) :: i !<
	73	INTEGER(iwp) :: j !<
	74	INTEGER(iwp) :: k !<
	75	INTEGER(iwp) :: n !<
	76	INTEGER(iwp) :: nxl1 !<
	77	INTEGER(iwp) :: nxl2 !<
	78	INTEGER(iwp) :: nys1 !<
	79	INTEGER(iwp) :: nys2 !<
[1]	80
[1682]	81	REAL(wp) :: ddzu(1:nz+1) !<
	82	REAL(wp) :: ddzw(1:nzt+1) !<
[1320]	83
[1682]	84	REAL(wp) :: d(nzb+1:nzt,nys:nyn,nxl:nxr) !<
	85	REAL(wp) :: p(nzb:nzt+1,nysg:nyng,nxlg:nxrg) !<
[1320]	86
[1682]	87	REAL(wp), DIMENSION(:), ALLOCATABLE :: f1 !<
	88	REAL(wp), DIMENSION(:), ALLOCATABLE :: f2 !<
	89	REAL(wp), DIMENSION(:), ALLOCATABLE :: f3 !<
[1320]	90
[1]	91	ALLOCATE( f1(1:nz), f2(1:nz), f3(1:nz) )
	92
	93	!
	94	!-- Compute pre-factors.
	95	DO k = 1, nz
	96	f2(k) = ddzu(k+1) * ddzw(k)
	97	f3(k) = ddzu(k) * ddzw(k)
[1353]	98	f1(k) = 2.0_wp * ( ddx2 + ddy2 ) + f2(k) + f3(k)
[1]	99	ENDDO
	100
	101	!
	102	!-- Limits for RED- and BLACK-part.
	103	IF ( MOD( nxl , 2 ) == 0 ) THEN
	104	nxl1 = nxl
	105	nxl2 = nxl + 1
	106	ELSE
	107	nxl1 = nxl + 1
	108	nxl2 = nxl
	109	ENDIF
	110	IF ( MOD( nys , 2 ) == 0 ) THEN
	111	nys1 = nys
	112	nys2 = nys + 1
	113	ELSE
	114	nys1 = nys + 1
	115	nys2 = nys
	116	ENDIF
	117
	118	DO n = 1, n_sor
	119
	120	!
	121	!-- RED-part
	122	DO i = nxl1, nxr, 2
	123	DO j = nys2, nyn, 2
	124	DO k = nzb+1, nzt
	125	p(k,j,i) = p(k,j,i) + omega_sor / f1(k) * ( &
	126	ddx2 * ( p(k,j,i+1) + p(k,j,i-1) ) + &
	127	ddy2 * ( p(k,j+1,i) + p(k,j-1,i) ) + &
	128	f2(k) * p(k+1,j,i) + &
	129	f3(k) * p(k-1,j,i) - &
	130	d(k,j,i) - &
	131	f1(k) * p(k,j,i) )
	132	ENDDO
	133	ENDDO
	134	ENDDO
	135
	136	DO i = nxl2, nxr, 2
	137	DO j = nys1, nyn, 2
	138	DO k = nzb+1, nzt
	139	p(k,j,i) = p(k,j,i) + omega_sor / f1(k) * ( &
	140	ddx2 * ( p(k,j,i+1) + p(k,j,i-1) ) + &
	141	ddy2 * ( p(k,j+1,i) + p(k,j-1,i) ) + &
	142	f2(k) * p(k+1,j,i) + &
	143	f3(k) * p(k-1,j,i) - &
	144	d(k,j,i) - &
	145	f1(k) * p(k,j,i) )
	146	ENDDO
	147	ENDDO
	148	ENDDO
	149
	150	!
	151	!-- Exchange of boundary values for p.
[667]	152	CALL exchange_horiz( p, nbgp )
[1]	153
	154	!
	155	!-- Horizontal (Neumann) boundary conditions in case of non-cyclic boundaries
[707]	156	IF ( .NOT. bc_lr_cyc ) THEN
[1762]	157	IF ( inflow_l .OR. outflow_l .OR. nest_bound_l ) p(:,:,nxl-1) = p(:,:,nxl)
	158	IF ( inflow_r .OR. outflow_r .OR. nest_bound_r ) p(:,:,nxr+1) = p(:,:,nxr)
[1]	159	ENDIF
[707]	160	IF ( .NOT. bc_ns_cyc ) THEN
[1762]	161	IF ( inflow_n .OR. outflow_n .OR. nest_bound_n ) p(:,nyn+1,:) = p(:,nyn,:)
	162	IF ( inflow_s .OR. outflow_s .OR. nest_bound_s ) p(:,nys-1,:) = p(:,nys,:)
[1]	163	ENDIF
	164
	165	!
	166	!-- BLACK-part
	167	DO i = nxl1, nxr, 2
	168	DO j = nys1, nyn, 2
	169	DO k = nzb+1, nzt
	170	p(k,j,i) = p(k,j,i) + omega_sor / f1(k) * ( &
	171	ddx2 * ( p(k,j,i+1) + p(k,j,i-1) ) + &
	172	ddy2 * ( p(k,j+1,i) + p(k,j-1,i) ) + &
	173	f2(k) * p(k+1,j,i) + &
	174	f3(k) * p(k-1,j,i) - &
	175	d(k,j,i) - &
	176	f1(k) * p(k,j,i) )
	177	ENDDO
	178	ENDDO
	179	ENDDO
	180
	181	DO i = nxl2, nxr, 2
	182	DO j = nys2, nyn, 2
	183	DO k = nzb+1, nzt
	184	p(k,j,i) = p(k,j,i) + omega_sor / f1(k) * ( &
	185	ddx2 * ( p(k,j,i+1) + p(k,j,i-1) ) + &
	186	ddy2 * ( p(k,j+1,i) + p(k,j-1,i) ) + &
	187	f2(k) * p(k+1,j,i) + &
	188	f3(k) * p(k-1,j,i) - &
	189	d(k,j,i) - &
	190	f1(k) * p(k,j,i) )
	191	ENDDO
	192	ENDDO
	193	ENDDO
	194
	195	!
	196	!-- Exchange of boundary values for p.
[667]	197	CALL exchange_horiz( p, nbgp )
[1]	198
	199	!
	200	!-- Boundary conditions top/bottom.
	201	!-- Bottom boundary
[667]	202	IF ( ibc_p_b == 1 ) THEN ! Neumann
[1]	203	p(nzb,:,:) = p(nzb+1,:,:)
[667]	204	ELSE ! Dirichlet
[1353]	205	p(nzb,:,:) = 0.0_wp
[1]	206	ENDIF
	207
	208	!
	209	!-- Top boundary
[667]	210	IF ( ibc_p_t == 1 ) THEN ! Neumann
[1]	211	p(nzt+1,:,:) = p(nzt,:,:)
[667]	212	ELSE ! Dirichlet
[1353]	213	p(nzt+1,:,:) = 0.0_wp
[1]	214	ENDIF
	215
	216	!
	217	!-- Horizontal (Neumann) boundary conditions in case of non-cyclic boundaries
[707]	218	IF ( .NOT. bc_lr_cyc ) THEN
[1762]	219	IF ( inflow_l .OR. outflow_l .OR. nest_bound_l ) p(:,:,nxl-1) = p(:,:,nxl)
	220	IF ( inflow_r .OR. outflow_r .OR. nest_bound_r ) p(:,:,nxr+1) = p(:,:,nxr)
[1]	221	ENDIF
[707]	222	IF ( .NOT. bc_ns_cyc ) THEN
[1762]	223	IF ( inflow_n .OR. outflow_n .OR. nest_bound_n ) p(:,nyn+1,:) = p(:,nyn,:)
	224	IF ( inflow_s .OR. outflow_s .OR. nest_bound_s ) p(:,nys-1,:) = p(:,nys,:)
[1]	225	ENDIF
	226
[667]	227
[1]	228	ENDDO
	229
	230	DEALLOCATE( f1, f2, f3 )
	231
	232	END SUBROUTINE sor

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