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source: palm/trunk/SOURCE/global_min_max.f90 @ 3947

Last change on this file since 3947 was 3655, checked in by knoop, 6 years ago
Bugfix: made "unit" and "found" intend INOUT in module interface subroutines + automatic copyright update
Property svn:keywords set to `Id`
File size: 11.1 KB

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1	!> @file global_min_max.f90
2	!------------------------------------------------------------------------------!
3	! This file is part of the PALM model system.
4	!
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.
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	!
17	! Copyright 1997-2019 Leibniz Universitaet Hannover
18	!------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! ------------------
22	!
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: global_min_max.f90 3655 2019-01-07 16:51:22Z hellstea $
27	! Corrected "Former revisions" section
28	!
29	! 2696 2017-12-14 17:12:51Z kanani
30	! Change in file header (GPL part)
31	!
32	! 2101 2017-01-05 16:42:31Z suehring
33	!
34	! 2000 2016-08-20 18:09:15Z knoop
35	! Forced header and separation lines into 80 columns
36	!
37	! 1682 2015-10-07 23:56:08Z knoop
38	! Code annotations made doxygen readable
39	!
40	! 1353 2014-04-08 15:21:23Z heinze
41	! REAL constants provided with KIND-attribute
42	!
43	! 1320 2014-03-20 08:40:49Z raasch
44	! ONLY-attribute added to USE-statements,
45	! kind-parameters added to all INTEGER and REAL declaration statements,
46	! kinds are defined in new module kinds,
47	! revision history before 2012 removed,
48	! comment fields (!:) to be used for variable explanations added to
49	! all variable declaration statements
50	!
51	! 1188 2013-06-20 12:00:08Z heinze
52	! Bugfix in modes 'min' and 'max': x and z component were interchanged
53	!
54	! 1036 2012-10-22 13:43:42Z raasch
55	! code put under GPL (PALM 3.9)
56	!
57	! 866 2012-03-28 06:44:41Z raasch
58	! new mode "absoff" accounts for an offset in the respective array
59	!
60	! Revision 1.1 1997/07/24 11:14:03 raasch
61	! Initial revision
62	!
63	!
64	! Description:
65	! ------------
66	!> Determine the array minimum/maximum and the corresponding indices.
67	!------------------------------------------------------------------------------!
68	SUBROUTINE global_min_max( i1, i2, j1, j2, k1, k2, ar, mode, offset, value, &
69	value_ijk, value1, value1_ijk )
70
71
72	USE indices, &
73	ONLY: nbgp, ny, nx
74
75	USE kinds
76
77	USE pegrid
78
79	IMPLICIT NONE
80
81	CHARACTER (LEN=*) :: mode !<
82
83	INTEGER(iwp) :: i !<
84	INTEGER(iwp) :: i1 !<
85	INTEGER(iwp) :: i2 !<
86	INTEGER(iwp) :: id_fmax !<
87	INTEGER(iwp) :: id_fmin !<
88	INTEGER(iwp) :: j !<
89	INTEGER(iwp) :: j1 !<
90	INTEGER(iwp) :: j2 !<
91	INTEGER(iwp) :: k !<
92	INTEGER(iwp) :: k1 !<
93	INTEGER(iwp) :: k2 !<
94	INTEGER(iwp) :: fmax_ijk(3) !<
95	INTEGER(iwp) :: fmax_ijk_l(3) !<
96	INTEGER(iwp) :: fmin_ijk(3) !<
97	INTEGER(iwp) :: fmin_ijk_l(3) !<
98	INTEGER(iwp) :: value_ijk(3) !<
99
100	INTEGER(iwp), OPTIONAL :: value1_ijk(3) !<
101
102	REAL(wp) :: offset !<
103	REAL(wp) :: value !<
104	REAL(wp) :: ar(i1:i2,j1:j2,k1:k2) !<
105
106	#if defined( __ibm )
107	REAL(sp) :: fmax(2) !<
108	REAL(sp) :: fmax_l(2) !<
109	REAL(sp) :: fmin(2) !<
110	REAL(sp) :: fmin_l(2) !<
111	! on 32bit-machines MPI_2REAL must not be replaced
112	! by MPI_2DOUBLE_PRECISION
113	#else
114	REAL(wp) :: fmax(2) !<
115	REAL(wp) :: fmax_l(2) !<
116	REAL(wp) :: fmin(2) !<
117	REAL(wp) :: fmin_l(2) !<
118	#endif
119	REAL(wp), OPTIONAL :: value1 !<
120
121
122	!
123	!-- Determine array minimum
124	IF ( mode == 'min' .OR. mode == 'minmax' ) THEN
125
126	!
127	!-- Determine the local minimum
128	fmin_ijk_l = MINLOC( ar )
129	fmin_ijk_l(1) = i1 + fmin_ijk_l(1) - 1 ! MINLOC assumes lowerbound = 1
130	fmin_ijk_l(2) = j1 + fmin_ijk_l(2) - nbgp
131	fmin_ijk_l(3) = k1 + fmin_ijk_l(3) - nbgp
132	fmin_l(1) = ar(fmin_ijk_l(1),fmin_ijk_l(2),fmin_ijk_l(3))
133
134	#if defined( __parallel )
135	fmin_l(2) = myid
136	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
137	CALL MPI_ALLREDUCE( fmin_l, fmin, 1, MPI_2REAL, MPI_MINLOC, comm2d, &
138	ierr )
139
140	!
141	!-- Determine the global minimum. Result stored on PE0.
142	id_fmin = fmin(2)
143	IF ( id_fmin /= 0 ) THEN
144	IF ( myid == 0 ) THEN
145	CALL MPI_RECV( fmin_ijk, 3, MPI_INTEGER, id_fmin, 0, comm2d, &
146	status, ierr )
147	ELSEIF ( myid == id_fmin ) THEN
148	CALL MPI_SEND( fmin_ijk_l, 3, MPI_INTEGER, 0, 0, comm2d, ierr )
149	ENDIF
150	ELSE
151	fmin_ijk = fmin_ijk_l
152	ENDIF
153	!
154	!-- Send the indices of the just determined array minimum to other PEs
155	CALL MPI_BCAST( fmin_ijk, 3, MPI_INTEGER, 0, comm2d, ierr )
156	#else
157	fmin(1) = fmin_l(1)
158	fmin_ijk = fmin_ijk_l
159	#endif
160
161	ENDIF
162
163	!
164	!-- Determine array maximum
165	IF ( mode == 'max' .OR. mode == 'minmax' ) THEN
166
167	!
168	!-- Determine the local maximum
169	fmax_ijk_l = MAXLOC( ar )
170	fmax_ijk_l(1) = i1 + fmax_ijk_l(1) - 1 ! MAXLOC assumes lowerbound = 1
171	fmax_ijk_l(2) = j1 + fmax_ijk_l(2) - nbgp
172	fmax_ijk_l(3) = k1 + fmax_ijk_l(3) - nbgp
173	fmax_l(1) = ar(fmax_ijk_l(1),fmax_ijk_l(2),fmax_ijk_l(3))
174
175	#if defined( __parallel )
176	fmax_l(2) = myid
177	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
178	CALL MPI_ALLREDUCE( fmax_l, fmax, 1, MPI_2REAL, MPI_MAXLOC, comm2d, &
179	ierr )
180
181	!
182	!-- Determine the global maximum. Result stored on PE0.
183	id_fmax = fmax(2)
184	IF ( id_fmax /= 0 ) THEN
185	IF ( myid == 0 ) THEN
186	CALL MPI_RECV( fmax_ijk, 3, MPI_INTEGER, id_fmax, 0, comm2d, &
187	status, ierr )
188	ELSEIF ( myid == id_fmax ) THEN
189	CALL MPI_SEND( fmax_ijk_l, 3, MPI_INTEGER, 0, 0, comm2d, ierr )
190	ENDIF
191	ELSE
192	fmax_ijk = fmax_ijk_l
193	ENDIF
194	!
195	!-- send the indices of the just determined array maximum to other PEs
196	CALL MPI_BCAST( fmax_ijk, 3, MPI_INTEGER, 0, comm2d, ierr )
197	#else
198	fmax(1) = fmax_l(1)
199	fmax_ijk = fmax_ijk_l
200	#endif
201
202	ENDIF
203
204	!
205	!-- Determine absolute array maximum
206	IF ( mode == 'abs' ) THEN
207
208	!
209	!-- Determine the local absolut maximum
210	fmax_l(1) = 0.0_wp
211	fmax_ijk_l(1) = i1
212	fmax_ijk_l(2) = j1
213	fmax_ijk_l(3) = k1
214	DO k = k1, k2
215	DO j = j1, j2
216	DO i = i1, i2
217	IF ( ABS( ar(i,j,k) ) > fmax_l(1) ) THEN
218	fmax_l(1) = ABS( ar(i,j,k) )
219	fmax_ijk_l(1) = i
220	fmax_ijk_l(2) = j
221	fmax_ijk_l(3) = k
222	ENDIF
223	ENDDO
224	ENDDO
225	ENDDO
226
227	!
228	!-- Set a flag in case that the determined value is negative.
229	!-- A constant offset has to be subtracted in order to handle the special
230	!-- case i=0 correctly
231	IF ( ar(fmax_ijk_l(1),fmax_ijk_l(2),fmax_ijk_l(3)) < 0.0_wp ) THEN
232	fmax_ijk_l(1) = -fmax_ijk_l(1) - 10
233	ENDIF
234
235	#if defined( __parallel )
236	fmax_l(2) = myid
237	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
238	CALL MPI_ALLREDUCE( fmax_l, fmax, 1, MPI_2REAL, MPI_MAXLOC, comm2d, &
239	ierr )
240
241	!
242	!-- Determine the global absolut maximum. Result stored on PE0.
243	id_fmax = fmax(2)
244	IF ( id_fmax /= 0 ) THEN
245	IF ( myid == 0 ) THEN
246	CALL MPI_RECV( fmax_ijk, 3, MPI_INTEGER, id_fmax, 0, comm2d, &
247	status, ierr )
248	ELSEIF ( myid == id_fmax ) THEN
249	CALL MPI_SEND( fmax_ijk_l, 3, MPI_INTEGER, 0, 0, comm2d, ierr )
250	ENDIF
251	ELSE
252	fmax_ijk = fmax_ijk_l
253	ENDIF
254	!
255	!-- Send the indices of the just determined absolut maximum to other PEs
256	CALL MPI_BCAST( fmax_ijk, 3, MPI_INTEGER, 0, comm2d, ierr )
257	#else
258	fmax(1) = fmax_l(1)
259	fmax_ijk = fmax_ijk_l
260	#endif
261
262	ENDIF
263
264	!
265	!-- Determine absolute maximum of ( array - offset )
266	IF ( mode == 'absoff' ) THEN
267
268	!
269	!-- Determine the local absolut maximum
270	fmax_l(1) = 0.0_wp
271	fmax_ijk_l(1) = i1
272	fmax_ijk_l(2) = j1
273	fmax_ijk_l(3) = k1
274	DO k = k1, k2
275	DO j = j1, j2
276	!
277	!-- Attention: the lowest gridpoint is excluded here, because there
278	!-- --------- is no advection at nzb=0 and mode 'absoff' is only
279	!-- used for calculating u,v extrema for CFL-criteria
280	DO i = i1+1, i2
281	IF ( ABS( ar(i,j,k) - offset ) > fmax_l(1) ) THEN
282	fmax_l(1) = ABS( ar(i,j,k) - offset )
283	fmax_ijk_l(1) = i
284	fmax_ijk_l(2) = j
285	fmax_ijk_l(3) = k
286	ENDIF
287	ENDDO
288	ENDDO
289	ENDDO
290
291	!
292	!-- Set a flag in case that the determined value is negative.
293	!-- A constant offset has to be subtracted in order to handle the special
294	!-- case i=0 correctly
295	IF ( ar(fmax_ijk_l(1),fmax_ijk_l(2),fmax_ijk_l(3)) < 0.0_wp ) THEN
296	fmax_ijk_l(1) = -fmax_ijk_l(1) - 10
297	ENDIF
298
299	#if defined( __parallel )
300	fmax_l(2) = myid
301	IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr )
302	CALL MPI_ALLREDUCE( fmax_l, fmax, 1, MPI_2REAL, MPI_MAXLOC, comm2d, &
303	ierr )
304
305	!
306	!-- Determine the global absolut maximum. Result stored on PE0.
307	id_fmax = fmax(2)
308	IF ( id_fmax /= 0 ) THEN
309	IF ( myid == 0 ) THEN
310	CALL MPI_RECV( fmax_ijk, 3, MPI_INTEGER, id_fmax, 0, comm2d, &
311	status, ierr )
312	ELSEIF ( myid == id_fmax ) THEN
313	CALL MPI_SEND( fmax_ijk_l, 3, MPI_INTEGER, 0, 0, comm2d, ierr )
314	ENDIF
315	ELSE
316	fmax_ijk = fmax_ijk_l
317	ENDIF
318	!
319	!-- Send the indices of the just determined absolut maximum to other PEs
320	CALL MPI_BCAST( fmax_ijk, 3, MPI_INTEGER, 0, comm2d, ierr )
321	#else
322	fmax(1) = fmax_l(1)
323	fmax_ijk = fmax_ijk_l
324	#endif
325
326	ENDIF
327
328	!
329	!-- Determine output parameters
330	SELECT CASE( mode )
331
332	CASE( 'min' )
333
334	value = fmin(1)
335	value_ijk = fmin_ijk
336
337	CASE( 'max' )
338
339	value = fmax(1)
340	value_ijk = fmax_ijk
341
342	CASE( 'minmax' )
343
344	value = fmin(1)
345	value_ijk = fmin_ijk
346	value1 = fmax(1)
347	value1_ijk = fmax_ijk
348
349	CASE( 'abs', 'absoff' )
350
351	value = fmax(1)
352	value_ijk = fmax_ijk
353	IF ( fmax_ijk(1) < 0 ) THEN
354	value = -value
355	value_ijk(1) = -value_ijk(1) - 10 !???
356	ENDIF
357
358	END SELECT
359
360	!
361	!-- Limit index values to the range 0..nx, 0..ny
362	IF ( value_ijk(3) < 0 ) value_ijk(3) = nx +1 + value_ijk(3)
363	IF ( value_ijk(3) > nx ) value_ijk(3) = value_ijk(3) - (nx+1)
364	IF ( value_ijk(2) < 0 ) value_ijk(2) = ny +1 + value_ijk(2)
365	IF ( value_ijk(2) > ny ) value_ijk(2) = value_ijk(2) - (ny+1)
366
367
368	END SUBROUTINE global_min_max

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