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source: palm/trunk/SOURCE/pres.f90 @ 2000

Last change on this file since 2000 was 2000, checked in by knoop, 9 years ago
Forced header and separation lines into 80 columns
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File size: 27.4 KB

Rev	Line
[1682]	1	!> @file pres.f90
[2000]	2	!------------------------------------------------------------------------------!
[1036]	3	! This file is part of PALM.
	4	!
[2000]	5	! PALM is free software: you can redistribute it and/or modify it under the
	6	! terms of the GNU General Public License as published by the Free Software
	7	! Foundation, either version 3 of the License, or (at your option) any later
	8	! version.
[1036]	9	!
	10	! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
	11	! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
	12	! A PARTICULAR PURPOSE. See the GNU General Public License for more details.
	13	!
	14	! You should have received a copy of the GNU General Public License along with
	15	! PALM. If not, see <http://www.gnu.org/licenses/>.
	16	!
[1818]	17	! Copyright 1997-2016 Leibniz Universitaet Hannover
[2000]	18	!------------------------------------------------------------------------------!
[1036]	19	!
[484]	20	! Current revisions:
[1212]	21	! ------------------
[2000]	22	! Forced header and separation lines into 80 columns
[1932]	23	!
[1919]	24	! Former revisions:
	25	! -----------------
	26	! $Id: pres.f90 2000 2016-08-20 18:09:15Z knoop $
	27	!
[1933]	28	! 1932 2016-06-10 12:09:21Z suehring
	29	! Initial version of purely vertical nesting introduced.
	30	!
[1932]	31	! 1931 2016-06-10 12:06:59Z suehring
	32	! Rename multigrid into multigrid_noopt and multigrid_fast into multigrid
	33	!
[1930]	34	! 1929 2016-06-09 16:25:25Z suehring
	35	! Bugfix: weight_substep for initial call, replace by local variable
	36	!
[1919]	37	! 1918 2016-05-27 14:35:57Z raasch
[1918]	38	! sum of divergence is also calculated when pres is called before the initial
	39	! first time step,
	40	! stearing is modified by using intermediate_timestep_count = 0 in order to
	41	! determine if pres is called before the first initial timestep,
	42	! bugfix: in case of Neumann conditions for pressure both at bottom and top,
	43	! mean vertical velocity is also removed for the first time step
	44	! bugfix for calculating divergences
[1321]	45	!
[1909]	46	! 1908 2016-05-25 17:22:32Z suehring
	47	! New divergence for output into RUN_CONTROL file is calculated only at last
	48	! Runge-Kutta step
	49	!
[1846]	50	! 1845 2016-04-08 08:29:13Z raasch
	51	! nzb_2d replace by nzb_u\|v_inner
	52	!
[1800]	53	! 1799 2016-04-05 08:35:55Z gronemeier
	54	! Bugfix: excluded third dimension from horizontal volume flow calculation
	55	!
[1763]	56	! 1762 2016-02-25 12:31:13Z hellstea
	57	! Introduction of nested domain feature
	58	!
[1683]	59	! 1682 2015-10-07 23:56:08Z knoop
	60	! Code annotations made doxygen readable
	61	!
[1576]	62	! 1575 2015-03-27 09:56:27Z raasch
	63	! poismg_fast + respective module added, adjustments for psolver-queries
	64	!
[1343]	65	! 1342 2014-03-26 17:04:47Z kanani
	66	! REAL constants defined as wp-kind
	67	!
[1321]	68	! 1320 2014-03-20 08:40:49Z raasch
[1320]	69	! ONLY-attribute added to USE-statements,
	70	! kind-parameters added to all INTEGER and REAL declaration statements,
	71	! kinds are defined in new module kinds,
	72	! old module precision_kind is removed,
	73	! revision history before 2012 removed,
	74	! comment fields (!:) to be used for variable explanations added to
	75	! all variable declaration statements
[708]	76	!
[1319]	77	! 1318 2014-03-17 13:35:16Z raasch
	78	! module interfaces removed
	79	!
[1307]	80	! 1306 2014-03-13 14:30:59Z raasch
	81	! second argument removed from routine poisfft
	82	!
[1258]	83	! 1257 2013-11-08 15:18:40Z raasch
	84	! openacc loop and loop vector clauses removed, independent clauses added,
	85	! end parallel replaced by end parallel loop
	86	!
[1222]	87	! 1221 2013-09-10 08:59:13Z raasch
	88	! openACC porting of reduction operations, loops for calculating d are
	89	! using the rflags_s_inner multiply flag instead of the nzb_s_inner loop index
	90	!
[1213]	91	! 1212 2013-08-15 08:46:27Z raasch
	92	! call of poisfft_hybrid removed
	93	!
[1118]	94	! 1117 2013-03-27 11:15:36Z suehring
	95	! Bugfix in OpenMP parallelization.
	96	!
[1114]	97	! 1113 2013-03-10 02:48:14Z raasch
	98	! GPU-porting of several loops, some loops rearranged
	99	!
[1112]	100	! 1111 2013-03-08 23:54:10Z
	101	! openACC statements added,
	102	! ibc_p_b = 2 removed
	103	!
[1093]	104	! 1092 2013-02-02 11:24:22Z raasch
	105	! unused variables removed
	106	!
[1037]	107	! 1036 2012-10-22 13:43:42Z raasch
	108	! code put under GPL (PALM 3.9)
	109	!
[1004]	110	! 1003 2012-09-14 14:35:53Z raasch
	111	! adjustment of array tend for cases with unequal subdomain sizes removed
	112	!
[1]	113	! Revision 1.1 1997/07/24 11:24:44 raasch
	114	! Initial revision
	115	!
	116	!
	117	! Description:
	118	! ------------
[1682]	119	!> Compute the divergence of the provisional velocity field. Solve the Poisson
	120	!> equation for the perturbation pressure. Compute the final velocities using
	121	!> this perturbation pressure. Compute the remaining divergence.
[1]	122	!------------------------------------------------------------------------------!
[1682]	123	SUBROUTINE pres
	124
[1]	125
[1320]	126	USE arrays_3d, &
	127	ONLY: d, ddzu, ddzu_pres, ddzw, dzw, p, p_loc, tend, u, v, w
	128
	129	USE control_parameters, &
	130	ONLY: bc_lr_cyc, bc_ns_cyc, conserve_volume_flow, dt_3d, &
	131	gathered_size, ibc_p_b, ibc_p_t, intermediate_timestep_count, &
[1908]	132	intermediate_timestep_count_max, mg_switch_to_pe0_level, &
[1933]	133	nest_domain, on_device, outflow_l, outflow_n, outflow_r, &
[1918]	134	outflow_s, psolver, subdomain_size, topography, volume_flow, &
	135	volume_flow_area, volume_flow_initial
[1320]	136
	137	USE cpulog, &
	138	ONLY: cpu_log, log_point, log_point_s
	139
	140	USE grid_variables, &
	141	ONLY: ddx, ddy
	142
	143	USE indices, &
	144	ONLY: nbgp, ngp_2dh_outer, nx, nxl, nxlg, nxl_mg, nxr, nxrg, nxr_mg, &
	145	ny, nys, nysg, nys_mg, nyn, nyng, nyn_mg, nzb, nzb_s_inner, &
[1845]	146	nzb_u_inner, nzb_v_inner, nzb_w_inner, nzt, nzt_mg, &
[1320]	147	rflags_s_inner
	148
	149	USE kinds
	150
[1]	151	USE pegrid
[1933]	152
	153	USE pmc_interface, &
	154	ONLY: nesting_mode
[1]	155
[1320]	156	USE poisfft_mod, &
	157	ONLY: poisfft
	158
[1575]	159	USE poismg_mod
	160
[1320]	161	USE statistics, &
	162	ONLY: statistic_regions, sums_divnew_l, sums_divold_l, weight_pres, &
	163	weight_substep
	164
[1]	165	IMPLICIT NONE
	166
[1682]	167	INTEGER(iwp) :: i !<
	168	INTEGER(iwp) :: j !<
	169	INTEGER(iwp) :: k !<
[1]	170
[1682]	171	REAL(wp) :: ddt_3d !<
[1918]	172	REAL(wp) :: d_weight_pres !<
[1682]	173	REAL(wp) :: localsum !<
	174	REAL(wp) :: threadsum !<
[1918]	175	REAL(wp) :: weight_pres_l !<
[1929]	176	REAL(wp) :: weight_substep_l !<
[1]	177
[1762]	178	REAL(wp), DIMENSION(1:3) :: volume_flow_l !<
	179	REAL(wp), DIMENSION(1:3) :: volume_flow_offset !<
[1682]	180	REAL(wp), DIMENSION(1:nzt) :: w_l !<
	181	REAL(wp), DIMENSION(1:nzt) :: w_l_l !<
[1]	182
[1933]	183	LOGICAL :: nest_domain_nvn !<
[1]	184
[1933]	185
[1]	186	CALL cpu_log( log_point(8), 'pres', 'start' )
	187
[85]	188
[1918]	189	!
	190	!-- Calculate quantities to be used locally
[1342]	191	ddt_3d = 1.0_wp / dt_3d
[1918]	192	IF ( intermediate_timestep_count == 0 ) THEN
	193	!
	194	!-- If pres is called before initial time step
[1929]	195	weight_pres_l = 1.0_wp
	196	d_weight_pres = 1.0_wp
	197	weight_substep_l = 1.0_wp
[1918]	198	ELSE
[1929]	199	weight_pres_l = weight_pres(intermediate_timestep_count)
	200	d_weight_pres = 1.0_wp / weight_pres(intermediate_timestep_count)
	201	weight_substep_l = weight_substep(intermediate_timestep_count)
[1918]	202	ENDIF
[85]	203
[1]	204	!
[707]	205	!-- Multigrid method expects array d to have one ghost layer.
	206	!--
[1575]	207	IF ( psolver(1:9) == 'multigrid' ) THEN
[667]	208
[1]	209	DEALLOCATE( d )
[667]	210	ALLOCATE( d(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1) )
[707]	211
	212	!
	213	!-- Since p is later used to hold the weighted average of the substeps, it
	214	!-- cannot be used in the iterative solver. Therefore, its initial value is
	215	!-- stored on p_loc, which is then iteratively advanced in every substep.
[1762]	216	IF ( intermediate_timestep_count <= 1 ) THEN
[707]	217	DO i = nxl-1, nxr+1
	218	DO j = nys-1, nyn+1
	219	DO k = nzb, nzt+1
	220	p_loc(k,j,i) = p(k,j,i)
	221	ENDDO
	222	ENDDO
	223	ENDDO
[667]	224	ENDIF
	225
[1918]	226	ELSEIF ( psolver == 'sor' .AND. intermediate_timestep_count <= 1 ) THEN
[707]	227
	228	!
	229	!-- Since p is later used to hold the weighted average of the substeps, it
	230	!-- cannot be used in the iterative solver. Therefore, its initial value is
	231	!-- stored on p_loc, which is then iteratively advanced in every substep.
	232	p_loc = p
	233
[1]	234	ENDIF
	235
	236	!
[75]	237	!-- Conserve the volume flow at the outflow in case of non-cyclic lateral
	238	!-- boundary conditions
[106]	239	!-- WARNING: so far, this conservation does not work at the left/south
	240	!-- boundary if the topography at the inflow differs from that at the
	241	!-- outflow! For this case, volume_flow_area needs adjustment!
	242	!
	243	!-- Left/right
[709]	244	IF ( conserve_volume_flow .AND. ( outflow_l .OR. outflow_r ) ) THEN
[680]	245
[1342]	246	volume_flow(1) = 0.0_wp
	247	volume_flow_l(1) = 0.0_wp
[106]	248
	249	IF ( outflow_l ) THEN
	250	i = 0
	251	ELSEIF ( outflow_r ) THEN
	252	i = nx+1
	253	ENDIF
	254
	255	DO j = nys, nyn
	256	!
	257	!-- Sum up the volume flow through the south/north boundary
[1845]	258	DO k = nzb_u_inner(j,i)+1, nzt
[667]	259	volume_flow_l(1) = volume_flow_l(1) + u(k,j,i) * dzw(k)
[106]	260	ENDDO
	261	ENDDO
	262
	263	#if defined( __parallel )
[680]	264	IF ( collective_wait ) CALL MPI_BARRIER( comm1dy, ierr )
[106]	265	CALL MPI_ALLREDUCE( volume_flow_l(1), volume_flow(1), 1, MPI_REAL, &
	266	MPI_SUM, comm1dy, ierr )
	267	#else
	268	volume_flow = volume_flow_l
	269	#endif
[709]	270	volume_flow_offset(1) = ( volume_flow_initial(1) - volume_flow(1) ) &
[106]	271	/ volume_flow_area(1)
	272
[667]	273	DO j = nysg, nyng
[1845]	274	DO k = nzb_u_inner(j,i)+1, nzt
[106]	275	u(k,j,i) = u(k,j,i) + volume_flow_offset(1)
	276	ENDDO
	277	ENDDO
	278
	279	ENDIF
	280
	281	!
	282	!-- South/north
[709]	283	IF ( conserve_volume_flow .AND. ( outflow_n .OR. outflow_s ) ) THEN
[106]	284
[1342]	285	volume_flow(2) = 0.0_wp
	286	volume_flow_l(2) = 0.0_wp
[75]	287
[106]	288	IF ( outflow_s ) THEN
	289	j = 0
	290	ELSEIF ( outflow_n ) THEN
[75]	291	j = ny+1
[106]	292	ENDIF
	293
	294	DO i = nxl, nxr
[75]	295	!
[106]	296	!-- Sum up the volume flow through the south/north boundary
[1845]	297	DO k = nzb_v_inner(j,i)+1, nzt
[667]	298	volume_flow_l(2) = volume_flow_l(2) + v(k,j,i) * dzw(k)
[75]	299	ENDDO
[106]	300	ENDDO
	301
[75]	302	#if defined( __parallel )
[680]	303	IF ( collective_wait ) CALL MPI_BARRIER( comm1dx, ierr )
[75]	304	CALL MPI_ALLREDUCE( volume_flow_l(2), volume_flow(2), 1, MPI_REAL, &
	305	MPI_SUM, comm1dx, ierr )
	306	#else
	307	volume_flow = volume_flow_l
	308	#endif
	309	volume_flow_offset(2) = ( volume_flow_initial(2) - volume_flow(2) ) &
[106]	310	/ volume_flow_area(2)
[75]	311
[667]	312	DO i = nxlg, nxrg
[709]	313	DO k = nzb_v_inner(j,i)+1, nzt
[106]	314	v(k,j,i) = v(k,j,i) + volume_flow_offset(2)
[75]	315	ENDDO
[106]	316	ENDDO
[75]	317
	318	ENDIF
	319
[76]	320	!
[1762]	321	!-- Remove mean vertical velocity in case that Neumann conditions are
[1933]	322	!-- used both at bottom and top boundary, and if not a nested domain in a
	323	!-- normal nesting run. In case of vertical nesting, this must be done.
	324	!-- Therefore an auxiliary logical variable nest_domain_nvn is used here, and
	325	!-- nvn stands for non-vertical nesting.
[1918]	326	!-- This cannot be done before the first initial time step because ngp_2dh_outer
	327	!-- is not yet known then.
[1933]	328	nest_domain_nvn = nest_domain
	329	IF ( nest_domain .AND. nesting_mode == 'vertical' ) THEN
	330	nest_domain_nvn = .FALSE.
	331	ENDIF
	332
	333	IF ( ibc_p_b == 1 .AND. ibc_p_t == 1 .AND. &
	334	.NOT. nest_domain_nvn .AND. intermediate_timestep_count /= 0 ) &
[1918]	335	THEN
	336	w_l = 0.0_wp; w_l_l = 0.0_wp
	337	DO i = nxl, nxr
	338	DO j = nys, nyn
	339	DO k = nzb_w_inner(j,i)+1, nzt
	340	w_l_l(k) = w_l_l(k) + w(k,j,i)
[76]	341	ENDDO
	342	ENDDO
[1918]	343	ENDDO
[76]	344	#if defined( __parallel )
[1918]	345	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
	346	CALL MPI_ALLREDUCE( w_l_l(1), w_l(1), nzt, MPI_REAL, MPI_SUM, &
	347	comm2d, ierr )
[76]	348	#else
[1918]	349	w_l = w_l_l
[76]	350	#endif
[1918]	351	DO k = 1, nzt
	352	w_l(k) = w_l(k) / ngp_2dh_outer(k,0)
	353	ENDDO
	354	DO i = nxlg, nxrg
	355	DO j = nysg, nyng
	356	DO k = nzb_w_inner(j,i)+1, nzt
	357	w(k,j,i) = w(k,j,i) - w_l(k)
[76]	358	ENDDO
	359	ENDDO
[1918]	360	ENDDO
[76]	361	ENDIF
[75]	362
	363	!
[1]	364	!-- Compute the divergence of the provisional velocity field.
	365	CALL cpu_log( log_point_s(1), 'divergence', 'start' )
	366
[1575]	367	IF ( psolver(1:9) == 'multigrid' ) THEN
[1]	368	!$OMP PARALLEL DO SCHEDULE( STATIC )
	369	DO i = nxl-1, nxr+1
	370	DO j = nys-1, nyn+1
	371	DO k = nzb, nzt+1
[1342]	372	d(k,j,i) = 0.0_wp
[1]	373	ENDDO
	374	ENDDO
	375	ENDDO
	376	ELSE
	377	!$OMP PARALLEL DO SCHEDULE( STATIC )
[1111]	378	!$acc kernels present( d )
[1003]	379	DO i = nxl, nxr
	380	DO j = nys, nyn
	381	DO k = nzb+1, nzt
[1342]	382	d(k,j,i) = 0.0_wp
[1]	383	ENDDO
	384	ENDDO
	385	ENDDO
[1111]	386	!$acc end kernels
[1]	387	ENDIF
	388
[1342]	389	localsum = 0.0_wp
	390	threadsum = 0.0_wp
[1]	391
	392	#if defined( __ibm )
	393	!$OMP PARALLEL PRIVATE (i,j,k) FIRSTPRIVATE(threadsum) REDUCTION(+:localsum)
	394	!$OMP DO SCHEDULE( STATIC )
	395	DO i = nxl, nxr
	396	DO j = nys, nyn
	397	DO k = nzb_s_inner(j,i)+1, nzt
[85]	398	d(k,j,i) = ( ( u(k,j,i+1) - u(k,j,i) ) * ddx + &
	399	( v(k,j+1,i) - v(k,j,i) ) * ddy + &
[673]	400	( w(k,j,i) - w(k-1,j,i) ) * ddzw(k) ) * ddt_3d &
	401	* d_weight_pres
[1]	402	ENDDO
	403	!
	404	!-- Compute possible PE-sum of divergences for flow_statistics
	405	DO k = nzb_s_inner(j,i)+1, nzt
	406	threadsum = threadsum + ABS( d(k,j,i) )
	407	ENDDO
	408
	409	ENDDO
	410	ENDDO
	411
[1918]	412	IF ( intermediate_timestep_count == intermediate_timestep_count_max .OR. &
	413	intermediate_timestep_count == 0 ) THEN
	414	localsum = localsum + threadsum * dt_3d * weight_pres_l
[1908]	415	ENDIF
[1]	416	!$OMP END PARALLEL
	417	#else
	418
[1111]	419	!$OMP PARALLEL PRIVATE (i,j,k)
	420	!$OMP DO SCHEDULE( STATIC )
[1221]	421	!$acc kernels present( d, ddzw, rflags_s_inner, u, v, w )
	422	!$acc loop collapse( 3 )
[1111]	423	DO i = nxl, nxr
	424	DO j = nys, nyn
	425	DO k = 1, nzt
[1221]	426	d(k,j,i) = ( ( u(k,j,i+1) - u(k,j,i) ) * ddx + &
	427	( v(k,j+1,i) - v(k,j,i) ) * ddy + &
	428	( w(k,j,i) - w(k-1,j,i) ) * ddzw(k) ) * ddt_3d &
	429	* d_weight_pres * rflags_s_inner(k,j,i)
[1]	430	ENDDO
	431	ENDDO
[1111]	432	ENDDO
	433	!$acc end kernels
	434	!$OMP END PARALLEL
[1]	435
	436	!
[1908]	437	!-- Compute possible PE-sum of divergences for flow_statistics. Carry out
	438	!-- computation only at last Runge-Kutta substep.
[1918]	439	IF ( intermediate_timestep_count == intermediate_timestep_count_max .OR. &
	440	intermediate_timestep_count == 0 ) THEN
[1908]	441	!$OMP PARALLEL PRIVATE (i,j,k) FIRSTPRIVATE(threadsum) REDUCTION(+:localsum)
	442	!$OMP DO SCHEDULE( STATIC )
	443	!$acc parallel loop collapse(3) present( d ) reduction(+:threadsum)
	444	DO i = nxl, nxr
	445	DO j = nys, nyn
	446	DO k = nzb+1, nzt
	447	threadsum = threadsum + ABS( d(k,j,i) )
	448	ENDDO
[1]	449	ENDDO
	450	ENDDO
[1908]	451	!$acc end parallel loop
[1918]	452	localsum = localsum + threadsum * dt_3d * weight_pres_l
[1908]	453	!$OMP END PARALLEL
	454	ENDIF
[1]	455	#endif
	456
	457	!
	458	!-- For completeness, set the divergence sum of all statistic regions to those
	459	!-- of the total domain
[1918]	460	IF ( intermediate_timestep_count == intermediate_timestep_count_max .OR. &
	461	intermediate_timestep_count == 0 ) THEN
[1908]	462	sums_divold_l(0:statistic_regions) = localsum
[1918]	463	ENDIF
[1]	464
	465	CALL cpu_log( log_point_s(1), 'divergence', 'stop' )
	466
	467	!
	468	!-- Compute the pressure perturbation solving the Poisson equation
[1575]	469	IF ( psolver == 'poisfft' ) THEN
[1]	470
	471	!
	472	!-- Solve Poisson equation via FFT and solution of tridiagonal matrices
[1575]	473	CALL poisfft( d )
[1212]	474
[1]	475	!
	476	!-- Store computed perturbation pressure and set boundary condition in
	477	!-- z-direction
	478	!$OMP PARALLEL DO
[1113]	479	!$acc kernels present( d, tend )
[1]	480	DO i = nxl, nxr
	481	DO j = nys, nyn
	482	DO k = nzb+1, nzt
	483	tend(k,j,i) = d(k,j,i)
	484	ENDDO
	485	ENDDO
	486	ENDDO
[1113]	487	!$acc end kernels
[1]	488
	489	!
	490	!-- Bottom boundary:
	491	!-- This condition is only required for internal output. The pressure
	492	!-- gradient (dp(nzb+1)-dp(nzb))/dz is not used anywhere else.
	493	IF ( ibc_p_b == 1 ) THEN
	494	!
	495	!-- Neumann (dp/dz = 0)
	496	!$OMP PARALLEL DO
[1113]	497	!$acc kernels present( nzb_s_inner, tend )
[667]	498	DO i = nxlg, nxrg
	499	DO j = nysg, nyng
[1]	500	tend(nzb_s_inner(j,i),j,i) = tend(nzb_s_inner(j,i)+1,j,i)
	501	ENDDO
	502	ENDDO
[1113]	503	!$acc end kernels
[1]	504
	505	ELSE
	506	!
	507	!-- Dirichlet
	508	!$OMP PARALLEL DO
[1113]	509	!$acc kernels present( tend )
[667]	510	DO i = nxlg, nxrg
	511	DO j = nysg, nyng
[1342]	512	tend(nzb_s_inner(j,i),j,i) = 0.0_wp
[1]	513	ENDDO
	514	ENDDO
[1113]	515	!$acc end kernels
[1]	516
	517	ENDIF
	518
	519	!
	520	!-- Top boundary
	521	IF ( ibc_p_t == 1 ) THEN
	522	!
	523	!-- Neumann
	524	!$OMP PARALLEL DO
[1113]	525	!$acc kernels present( tend )
[667]	526	DO i = nxlg, nxrg
	527	DO j = nysg, nyng
[1]	528	tend(nzt+1,j,i) = tend(nzt,j,i)
	529	ENDDO
	530	ENDDO
[1113]	531	!$acc end kernels
[1]	532
	533	ELSE
	534	!
	535	!-- Dirichlet
	536	!$OMP PARALLEL DO
[1113]	537	!$acc kernels present( tend )
[667]	538	DO i = nxlg, nxrg
	539	DO j = nysg, nyng
[1342]	540	tend(nzt+1,j,i) = 0.0_wp
[1]	541	ENDDO
	542	ENDDO
[1113]	543	!$acc end kernels
[1]	544
	545	ENDIF
	546
	547	!
	548	!-- Exchange boundaries for p
[1113]	549	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
	550	on_device = .TRUE. ! to be removed after complete porting
	551	ELSE ! of ghost point exchange
	552	!$acc update host( tend )
	553	ENDIF
[667]	554	CALL exchange_horiz( tend, nbgp )
[1113]	555	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
	556	on_device = .FALSE. ! to be removed after complete porting
	557	ELSE ! of ghost point exchange
	558	!$acc update device( tend )
	559	ENDIF
[1]	560
	561	ELSEIF ( psolver == 'sor' ) THEN
	562
	563	!
	564	!-- Solve Poisson equation for perturbation pressure using SOR-Red/Black
	565	!-- scheme
[707]	566	CALL sor( d, ddzu_pres, ddzw, p_loc )
	567	tend = p_loc
[1]	568
[1575]	569	ELSEIF ( psolver(1:9) == 'multigrid' ) THEN
[1]	570
	571	!
	572	!-- Solve Poisson equation for perturbation pressure using Multigrid scheme,
[667]	573	!-- array tend is used to store the residuals, logical exchange_mg is used
	574	!-- to discern data exchange in multigrid ( 1 ghostpoint ) and normal grid
	575	!-- ( nbgp ghost points ).
[778]	576
	577	!-- If the number of grid points of the gathered grid, which is collected
	578	!-- on PE0, is larger than the number of grid points of an PE, than array
	579	!-- tend will be enlarged.
	580	IF ( gathered_size > subdomain_size ) THEN
	581	DEALLOCATE( tend )
	582	ALLOCATE( tend(nzb:nzt_mg(mg_switch_to_pe0_level)+1,nys_mg( &
	583	mg_switch_to_pe0_level)-1:nyn_mg(mg_switch_to_pe0_level)+1,&
	584	nxl_mg(mg_switch_to_pe0_level)-1:nxr_mg( &
	585	mg_switch_to_pe0_level)+1) )
	586	ENDIF
	587
[1575]	588	IF ( psolver == 'multigrid' ) THEN
	589	CALL poismg( tend )
	590	ELSE
[1931]	591	CALL poismg_noopt( tend )
[1575]	592	ENDIF
[707]	593
[778]	594	IF ( gathered_size > subdomain_size ) THEN
	595	DEALLOCATE( tend )
	596	ALLOCATE( tend(nzb:nzt+1,nysg:nyng,nxlg:nxrg) )
	597	ENDIF
	598
[1]	599	!
	600	!-- Restore perturbation pressure on tend because this array is used
	601	!-- further below to correct the velocity fields
[707]	602	DO i = nxl-1, nxr+1
	603	DO j = nys-1, nyn+1
	604	DO k = nzb, nzt+1
	605	tend(k,j,i) = p_loc(k,j,i)
	606	ENDDO
	607	ENDDO
	608	ENDDO
[667]	609
[1]	610	ENDIF
	611
	612	!
[707]	613	!-- Store perturbation pressure on array p, used for pressure data output.
	614	!-- Ghost layers are added in the output routines (except sor-method: see below)
[1918]	615	IF ( intermediate_timestep_count <= 1 ) THEN
[707]	616	!$OMP PARALLEL PRIVATE (i,j,k)
	617	!$OMP DO
[1929]	618	!$acc kernels present( p, tend, weight_substep_l )
[1257]	619	!$acc loop independent
[707]	620	DO i = nxl-1, nxr+1
[1257]	621	!$acc loop independent
[707]	622	DO j = nys-1, nyn+1
[1257]	623	!$acc loop independent
[707]	624	DO k = nzb, nzt+1
	625	p(k,j,i) = tend(k,j,i) * &
[1929]	626	weight_substep_l
[673]	627	ENDDO
[1]	628	ENDDO
[707]	629	ENDDO
[1113]	630	!$acc end kernels
[707]	631	!$OMP END PARALLEL
	632
[1762]	633	ELSEIF ( intermediate_timestep_count > 1 ) THEN
[707]	634	!$OMP PARALLEL PRIVATE (i,j,k)
	635	!$OMP DO
[1929]	636	!$acc kernels present( p, tend, weight_substep_l )
[1257]	637	!$acc loop independent
[707]	638	DO i = nxl-1, nxr+1
[1257]	639	!$acc loop independent
[707]	640	DO j = nys-1, nyn+1
[1257]	641	!$acc loop independent
[707]	642	DO k = nzb, nzt+1
	643	p(k,j,i) = p(k,j,i) + tend(k,j,i) * &
[1929]	644	weight_substep_l
[673]	645	ENDDO
	646	ENDDO
[707]	647	ENDDO
[1113]	648	!$acc end kernels
[707]	649	!$OMP END PARALLEL
	650
	651	ENDIF
[673]	652
[707]	653	!
	654	!-- SOR-method needs ghost layers for the next timestep
	655	IF ( psolver == 'sor' ) CALL exchange_horiz( p, nbgp )
[682]	656
[1]	657	!
	658	!-- Correction of the provisional velocities with the current perturbation
	659	!-- pressure just computed
[709]	660	IF ( conserve_volume_flow .AND. ( bc_lr_cyc .OR. bc_ns_cyc ) ) THEN
[1342]	661	volume_flow_l(1) = 0.0_wp
	662	volume_flow_l(2) = 0.0_wp
[1]	663	ENDIF
[707]	664
[1]	665	!$OMP PARALLEL PRIVATE (i,j,k)
	666	!$OMP DO
[1918]	667	!$acc kernels present( ddzu, nzb_u_inner, nzb_v_inner, nzb_w_inner, tend, u, v, w )
[1257]	668	!$acc loop independent
[673]	669	DO i = nxl, nxr
[1257]	670	!$acc loop independent
[1]	671	DO j = nys, nyn
[1257]	672	!$acc loop independent
[1113]	673	DO k = 1, nzt
	674	IF ( k > nzb_w_inner(j,i) ) THEN
	675	w(k,j,i) = w(k,j,i) - dt_3d * &
	676	( tend(k+1,j,i) - tend(k,j,i) ) * ddzu(k+1) * &
[1918]	677	weight_pres_l
[1113]	678	ENDIF
[1]	679	ENDDO
[1257]	680	!$acc loop independent
[1113]	681	DO k = 1, nzt
	682	IF ( k > nzb_u_inner(j,i) ) THEN
	683	u(k,j,i) = u(k,j,i) - dt_3d * &
	684	( tend(k,j,i) - tend(k,j,i-1) ) * ddx * &
[1918]	685	weight_pres_l
[1113]	686	ENDIF
[1]	687	ENDDO
[1257]	688	!$acc loop independent
[1113]	689	DO k = 1, nzt
	690	IF ( k > nzb_v_inner(j,i) ) THEN
	691	v(k,j,i) = v(k,j,i) - dt_3d * &
	692	( tend(k,j,i) - tend(k,j-1,i) ) * ddy * &
[1918]	693	weight_pres_l
[1113]	694	ENDIF
[673]	695	ENDDO
[1]	696
	697	ENDDO
	698	ENDDO
[1113]	699	!$acc end kernels
[1]	700	!$OMP END PARALLEL
[1113]	701
	702	!
	703	!-- Sum up the volume flow through the right and north boundary
	704	IF ( conserve_volume_flow .AND. bc_lr_cyc .AND. bc_ns_cyc .AND. &
	705	nxr == nx ) THEN
	706
	707	!$OMP PARALLEL PRIVATE (j,k)
	708	!$OMP DO
	709	DO j = nys, nyn
	710	!$OMP CRITICAL
[1845]	711	DO k = nzb_u_inner(j,nx) + 1, nzt
[1113]	712	volume_flow_l(1) = volume_flow_l(1) + u(k,j,nx) * dzw(k)
	713	ENDDO
	714	!$OMP END CRITICAL
	715	ENDDO
	716	!$OMP END PARALLEL
	717
	718	ENDIF
	719
	720	IF ( conserve_volume_flow .AND. bc_ns_cyc .AND. bc_lr_cyc .AND. &
	721	nyn == ny ) THEN
	722
	723	!$OMP PARALLEL PRIVATE (i,k)
	724	!$OMP DO
	725	DO i = nxl, nxr
	726	!$OMP CRITICAL
[1845]	727	DO k = nzb_v_inner(ny,i) + 1, nzt
[1113]	728	volume_flow_l(2) = volume_flow_l(2) + v(k,ny,i) * dzw(k)
	729	ENDDO
	730	!$OMP END CRITICAL
	731	ENDDO
	732	!$OMP END PARALLEL
	733
	734	ENDIF
[673]	735
[1]	736	!
	737	!-- Conserve the volume flow
[707]	738	IF ( conserve_volume_flow .AND. ( bc_lr_cyc .AND. bc_ns_cyc ) ) THEN
[1]	739
	740	#if defined( __parallel )
[622]	741	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
[1]	742	CALL MPI_ALLREDUCE( volume_flow_l(1), volume_flow(1), 2, MPI_REAL, &
	743	MPI_SUM, comm2d, ierr )
	744	#else
	745	volume_flow = volume_flow_l
	746	#endif
	747
[1799]	748	volume_flow_offset(1:2) = ( volume_flow_initial(1:2) - volume_flow(1:2) ) / &
	749	volume_flow_area(1:2)
[1]	750
	751	!$OMP PARALLEL PRIVATE (i,j,k)
	752	!$OMP DO
	753	DO i = nxl, nxr
	754	DO j = nys, nyn
[667]	755	DO k = nzb_u_inner(j,i) + 1, nzt
	756	u(k,j,i) = u(k,j,i) + volume_flow_offset(1)
[719]	757	ENDDO
[1845]	758	DO k = nzb_v_inner(j,i) + 1, nzt
[667]	759	v(k,j,i) = v(k,j,i) + volume_flow_offset(2)
	760	ENDDO
[1]	761	ENDDO
	762	ENDDO
[667]	763
[1]	764	!$OMP END PARALLEL
	765
	766	ENDIF
	767
	768	!
	769	!-- Exchange of boundaries for the velocities
[1113]	770	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
	771	on_device = .TRUE. ! to be removed after complete porting
	772	ELSE ! of ghost point exchange
	773	!$acc update host( u, v, w )
	774	ENDIF
[667]	775	CALL exchange_horiz( u, nbgp )
	776	CALL exchange_horiz( v, nbgp )
	777	CALL exchange_horiz( w, nbgp )
[1113]	778	IF ( numprocs == 1 ) THEN ! workaround for single-core GPU runs
	779	on_device = .FALSE. ! to be removed after complete porting
	780	ELSE ! of ghost point exchange
	781	!$acc update device( u, v, w )
	782	ENDIF
[1]	783
	784	!
	785	!-- Compute the divergence of the corrected velocity field,
[1908]	786	!-- A possible PE-sum is computed in flow_statistics. Carry out computation
	787	!-- only at last Runge-Kutta step.
[1918]	788	IF ( intermediate_timestep_count == intermediate_timestep_count_max .OR. &
	789	intermediate_timestep_count == 0 ) THEN
[1908]	790	CALL cpu_log( log_point_s(1), 'divergence', 'start' )
	791	sums_divnew_l = 0.0_wp
[1]	792
	793	!
[1908]	794	!-- d must be reset to zero because it can contain nonzero values below the
	795	!-- topography
	796	IF ( topography /= 'flat' ) d = 0.0_wp
[1]	797
[1908]	798	localsum = 0.0_wp
	799	threadsum = 0.0_wp
[1]	800
[1908]	801	!$OMP PARALLEL PRIVATE (i,j,k) FIRSTPRIVATE(threadsum) REDUCTION(+:localsum)
	802	!$OMP DO SCHEDULE( STATIC )
[1]	803	#if defined( __ibm )
[1908]	804	DO i = nxl, nxr
	805	DO j = nys, nyn
	806	DO k = nzb_s_inner(j,i)+1, nzt
	807	d(k,j,i) = ( u(k,j,i+1) - u(k,j,i) ) * ddx + &
	808	( v(k,j+1,i) - v(k,j,i) ) * ddy + &
	809	( w(k,j,i) - w(k-1,j,i) ) * ddzw(k)
	810	ENDDO
	811	DO k = nzb+1, nzt
	812	threadsum = threadsum + ABS( d(k,j,i) )
	813	ENDDO
[1]	814	ENDDO
	815	ENDDO
	816	#else
[1908]	817	!$acc kernels present( d, ddzw, rflags_s_inner, u, v, w )
	818	!$acc loop collapse( 3 )
	819	DO i = nxl, nxr
	820	DO j = nys, nyn
	821	DO k = 1, nzt
	822	d(k,j,i) = ( ( u(k,j,i+1) - u(k,j,i) ) * ddx + &
	823	( v(k,j+1,i) - v(k,j,i) ) * ddy + &
	824	( w(k,j,i) - w(k-1,j,i) ) * ddzw(k) &
	825	) * rflags_s_inner(k,j,i)
	826	ENDDO
[1113]	827	ENDDO
	828	ENDDO
[1908]	829	!$acc end kernels
[1113]	830	!
[1908]	831	!-- Compute possible PE-sum of divergences for flow_statistics
	832	!$acc parallel loop collapse(3) present( d ) reduction(+:threadsum)
	833	DO i = nxl, nxr
	834	DO j = nys, nyn
	835	DO k = nzb+1, nzt
	836	threadsum = threadsum + ABS( d(k,j,i) )
	837	ENDDO
[1]	838	ENDDO
	839	ENDDO
[1908]	840	!$acc end parallel loop
[1]	841	#endif
[667]	842
[1908]	843	localsum = localsum + threadsum
	844	!$OMP END PARALLEL
[1]	845
	846	!
[1908]	847	!-- For completeness, set the divergence sum of all statistic regions to those
	848	!-- of the total domain
	849	sums_divnew_l(0:statistic_regions) = localsum
[1]	850
[1908]	851	CALL cpu_log( log_point_s(1), 'divergence', 'stop' )
[1]	852
[1908]	853	ENDIF
	854
[1]	855	CALL cpu_log( log_point(8), 'pres', 'stop' )
	856
	857
	858	END SUBROUTINE pres

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