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source: palm/trunk/SOURCE/synthetic_turbulence_generator_mod.f90 @ 2600

Last change on this file since 2600 was 2576, checked in by Giersch, 7 years ago
Bugfixes for restart runs
Property svn:keywords set to `Id`
File size: 35.2 KB

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1	!> @synthetic_turbulence_generator_mod.f90
2	!------------------------------------------------------------------------------!
3	! This file is part of PALM-4U.
4	!
5	! PALM-4U 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-4U 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 2017 Leibniz Universitaet Hannover
18	!------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! -----------------
22	!
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: synthetic_turbulence_generator_mod.f90 2576 2017-10-24 13:49:46Z raasch $
27	! Definition of a new function called stg_skip_var_list to skip module
28	! parameters during reading restart data
29	!
30	! 2563 2017-10-19 15:36:10Z Giersch
31	! stg_read_restart_data is called in stg_parin in the case of a restart run
32	!
33	! 2259 2017-06-08 09:09:11Z gronemeier
34	! Initial revision
35	!
36	!
37	!
38	! Authors:
39	! --------
40	! @author Tobias Gronemeier, Atsushi Inagaki, Micha Gryschka, Christoph Knigge
41	!
42	!
43	! Description:
44	! ------------
45	!> The module generates turbulence at the inflow boundary based on a method by
46	!> Xie and Castro (2008) utilizing a Lund rotation (Lund, 1998) and a mass-flux
47	!> correction by Kim et al. (2013).
48	!> The turbulence is correlated based on length scales in y- and z-direction and
49	!> a time scale for each velocity component. The profiles of length and time
50	!> scales, mean u, v, w, e and pt, and all components of the Reynolds stress
51	!> tensor are read from file STG_PROFILES.
52	!>
53	!> @todo test restart
54	!> enable cyclic_fill
55	!> implement turbulence generation for e and pt
56	!> @note <Enter notes on the module>
57	!> @bug Height information from input file is not used. Profiles from input
58	!> must match with current PALM grid.
59	!> Transformation of length scales to number of gridpoints does not
60	!> consider grid stretching.
61	!> In case of restart, velocity seeds differ from precursor run if a11,
62	!> a22, or a33 are zero.
63	!------------------------------------------------------------------------------!
64	MODULE synthetic_turbulence_generator_mod
65
66
67	USE arrays_3d, &
68	ONLY: mean_inflow_profiles, u, v, w
69
70	USE constants, &
71	ONLY: pi
72
73	USE control_parameters, &
74	ONLY: initializing_actions, message_string, &
75	synthetic_turbulence_generator
76
77	USE cpulog, &
78	ONLY: cpu_log, log_point, log_point_s
79
80	USE indices, &
81	ONLY: nbgp, nzb, nzt, nyng, nysg
82
83	USE kinds
84
85	USE MPI
86
87	USE pegrid, &
88	ONLY: comm1dx, comm1dy, comm2d, id_inflow, ierr, myidx, pdims
89
90	USE transpose_indices, &
91	ONLY: nzb_x, nzt_x
92
93
94	IMPLICIT NONE
95
96	LOGICAL :: velocity_seed_initialized = .FALSE. !< true after first call of stg_main
97	LOGICAL :: use_synthetic_turbulence_generator = .FALSE. !< switch to use synthetic turbulence generator
98
99	INTEGER(iwp) :: stg_type_yz !< MPI type for full z range
100	INTEGER(iwp) :: stg_type_yz_small !< MPI type for small z range
101	INTEGER(iwp) :: merg !< maximum length scale (in gp)
102	INTEGER(iwp) :: mergp !< merg + nbgp
103
104	REAL(wp) :: mc_factor !< mass flux correction factor
105
106	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: displs !< displacement for MPI_GATHERV
107	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: recv_count !< receive count for MPI_GATHERV
108	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nuy !< length scale of u in y direction (in gp)
109	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nuz !< length scale of u in z direction (in gp)
110	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nvy !< length scale of v in y direction (in gp)
111	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nvz !< length scale of v in z direction (in gp)
112	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nwy !< length scale of w in y direction (in gp)
113	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nwz !< length scale of w in z direction (in gp)
114
115	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: seed !< seed of random number for rn-generator
116
117	REAL(wp), DIMENSION(:), ALLOCATABLE :: a11 !< coefficient for Lund rotation
118	REAL(wp), DIMENSION(:), ALLOCATABLE :: a21 !< coefficient for Lund rotation
119	REAL(wp), DIMENSION(:), ALLOCATABLE :: a22 !< coefficient for Lund rotation
120	REAL(wp), DIMENSION(:), ALLOCATABLE :: a31 !< coefficient for Lund rotation
121	REAL(wp), DIMENSION(:), ALLOCATABLE :: a32 !< coefficient for Lund rotation
122	REAL(wp), DIMENSION(:), ALLOCATABLE :: a33 !< coefficient for Lund rotation
123	REAL(wp), DIMENSION(:), ALLOCATABLE :: tu !< Lagrangian time scale of u
124	REAL(wp), DIMENSION(:), ALLOCATABLE :: tv !< Lagrangian time scale of v
125	REAL(wp), DIMENSION(:), ALLOCATABLE :: tw !< Lagrangian time scale of w
126
127	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: buy !< filter function for u in y direction
128	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: buz !< filter function for u in z direction
129	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: bvy !< filter function for v in y direction
130	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: bvz !< filter function for v in z direction
131	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: bwy !< filter function for w in y direction
132	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: bwz !< filter function for w in z direction
133	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: fu !< velocity seed for u
134	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: fuo !< velocity seed for u with new random number
135	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: fv !< velocity seed for v
136	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: fvo !< velocity seed for v with new random number
137	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: fw !< velocity seed for w
138	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: fwo !< velocity seed for w with new random number
139
140
141	!
142	!-- PALM interfaces:
143	!-- Input parameter checks to be done in check_parameters
144	INTERFACE stg_check_parameters
145	MODULE PROCEDURE stg_check_parameters
146	END INTERFACE stg_check_parameters
147
148	!
149	!-- Calculate filter functions
150	INTERFACE stg_filter_func
151	MODULE PROCEDURE stg_filter_func
152	END INTERFACE stg_filter_func
153
154	!
155	!-- Generate velocity seeds
156	INTERFACE stg_generate_seed_yz
157	MODULE PROCEDURE stg_generate_seed_yz
158	END INTERFACE stg_generate_seed_yz
159
160	!
161	!-- Output of information to the header file
162	INTERFACE stg_header
163	MODULE PROCEDURE stg_header
164	END INTERFACE stg_header
165
166	!
167	!-- Initialization actions
168	INTERFACE stg_init
169	MODULE PROCEDURE stg_init
170	END INTERFACE stg_init
171
172	!
173	!-- Main procedure of synth. turb. gen.
174	INTERFACE stg_main
175	MODULE PROCEDURE stg_main
176	END INTERFACE stg_main
177
178	!
179	!-- Reading of NAMELIST parameters
180	INTERFACE stg_parin
181	MODULE PROCEDURE stg_parin
182	END INTERFACE stg_parin
183
184	!
185	!-- Skipping of parameters for restart runs
186	INTERFACE stg_skip_var_list
187	MODULE PROCEDURE stg_skip_var_list
188	END INTERFACE stg_skip_var_list
189
190	!
191	!-- Reading of parameters for restart runs
192	INTERFACE stg_read_restart_data
193	MODULE PROCEDURE stg_read_restart_data
194	END INTERFACE stg_read_restart_data
195
196	!
197	!-- Writing of binary output for restart runs
198	INTERFACE stg_write_restart_data
199	MODULE PROCEDURE stg_write_restart_data
200	END INTERFACE stg_write_restart_data
201
202	SAVE
203
204	PRIVATE
205
206	!
207	!-- Public interfaces
208	PUBLIC stg_check_parameters, stg_header, stg_init, stg_main, stg_parin, &
209	stg_write_restart_data, stg_skip_var_list
210
211	!
212	!-- Public variables
213	PUBLIC use_synthetic_turbulence_generator
214
215
216	CONTAINS
217
218
219	!------------------------------------------------------------------------------!
220	! Description:
221	! ------------
222	!> Check parameters routine for synthetic turbulence generator
223	!------------------------------------------------------------------------------!
224	SUBROUTINE stg_check_parameters
225
226
227	USE control_parameters, &
228	ONLY: bc_lr, bc_ns, turbulent_inflow
229
230
231	IMPLICIT NONE
232
233	IF ( use_synthetic_turbulence_generator ) THEN
234
235	IF ( INDEX( initializing_actions, 'set_constant_profiles' ) == 0 .AND. &
236	INDEX( initializing_actions, 'read_restart_data' ) == 0 ) THEN
237	message_string = 'Using synthetic turbulence generator ' // &
238	'requires &initializing_actions = ' // &
239	'"set_constant_profiles" or "read_restart_data"'
240	CALL message( 'stg_check_parameters', 'PA0015', 1, 2, 0, 6, 0 )
241	ENDIF
242
243	IF ( bc_lr /= 'dirichlet/radiation' ) THEN
244	message_string = 'Using synthetic turbulence generator ' // &
245	'requires &bc_lr = "dirichlet/radiation"'
246	CALL message( 'stg_check_parameters', 'PA0035', 1, 2, 0, 6, 0 )
247	ENDIF
248	IF ( bc_ns /= 'cyclic' ) THEN
249	message_string = 'Using synthetic turbulence generator ' // &
250	'requires &bc_ns = "cyclic"'
251	CALL message( 'stg_check_parameters', 'PA0037', 1, 2, 0, 6, 0 )
252	ENDIF
253	IF ( turbulent_inflow ) THEN
254	message_string = 'Using synthetic turbulence generator ' // &
255	'in combination &with turbulent_inflow = .T. ' // &
256	'is not allowed'
257	CALL message( 'stg_check_parameters', 'PA0039', 1, 2, 0, 6, 0 )
258	ENDIF
259
260	ENDIF
261
262	END SUBROUTINE stg_check_parameters
263
264
265	!------------------------------------------------------------------------------!
266	! Description:
267	! ------------
268	!> Header output for synthetic turbulence generator
269	!------------------------------------------------------------------------------!
270	SUBROUTINE stg_header ( io )
271
272
273	IMPLICIT NONE
274
275	INTEGER(iwp), INTENT(IN) :: io !< Unit of the output file
276
277	!
278	!-- Write synthetic turbulence generator Header
279	WRITE( io, 1 )
280	IF ( use_synthetic_turbulence_generator ) THEN
281	WRITE( io, 2 )
282	ELSE
283	WRITE( io, 3 )
284	ENDIF
285
286	1 FORMAT (//' Synthetic turbulence generator information:'/ &
287	' ------------------------------------------'/)
288	2 FORMAT (' synthetic turbulence generator switched on')
289	3 FORMAT (' synthetic turbulence generator switched off')
290
291	END SUBROUTINE stg_header
292
293
294	!------------------------------------------------------------------------------!
295	! Description:
296	! ------------
297	!> Initialization of the synthetic turbulence generator
298	!------------------------------------------------------------------------------!
299	SUBROUTINE stg_init
300
301
302	USE arrays_3d, &
303	ONLY: u_init, v_init
304
305	USE control_parameters, &
306	ONLY: coupling_char, dz, e_init
307
308	USE grid_variables, &
309	ONLY: ddy
310
311
312	IMPLICIT NONE
313
314	INTEGER(KIND=MPI_ADDRESS_KIND) :: extent !< extent of new MPI type
315	INTEGER(KIND=MPI_ADDRESS_KIND) :: tob=0 !< dummy variable
316
317	INTEGER(iwp) :: j !> loop index
318	INTEGER(iwp) :: k !< index
319	INTEGER(iwp) :: newtype !< dummy MPI type
320	INTEGER(iwp) :: realsize !< size of REAL variables
321	INTEGER(iwp) :: nseed !< dimension of random number seed
322	INTEGER(iwp) :: startseed = 1234567890 !< start seed for random number generator
323
324	!
325	!-- Dummy variables used for reading profiles
326	REAL(wp) :: d1 !< u profile
327	REAL(wp) :: d2 !< v profile
328	REAL(wp) :: d3 !< w profile
329	REAL(wp) :: d5 !< e profile
330	REAL(wp) :: d11 !< vertical interpolation for a11
331	REAL(wp) :: d21 !< vertical interpolation for a21
332	REAL(wp) :: d22 !< vertical interpolation for a22
333	REAL(wp) :: luy !< length scale for u in y direction
334	REAL(wp) :: luz !< length scale for u in z direction
335	REAL(wp) :: lvy !< length scale for v in y direction
336	REAL(wp) :: lvz !< length scale for v in z direction
337	REAL(wp) :: lwy !< length scale for w in y direction
338	REAL(wp) :: lwz !< length scale for w in z direction
339	REAL(wp) :: zz !< height
340
341	REAL(wp),DIMENSION(nzb:nzt+1) :: r11 !< Reynolds parameter
342	REAL(wp),DIMENSION(nzb:nzt+1) :: r21 !< Reynolds parameter
343	REAL(wp),DIMENSION(nzb:nzt+1) :: r22 !< Reynolds parameter
344	REAL(wp),DIMENSION(nzb:nzt+1) :: r31 !< Reynolds parameter
345	REAL(wp),DIMENSION(nzb:nzt+1) :: r32 !< Reynolds parameter
346	REAL(wp),DIMENSION(nzb:nzt+1) :: r33 !< Reynolds parameter
347
348
349	#if defined( __parallel )
350	CALL MPI_BARRIER( comm2d, ierr )
351	#endif
352
353	CALL cpu_log( log_point(57), 'synthetic_turbulence_gen', 'start' )
354
355	IF ( .NOT. ALLOCATED( mean_inflow_profiles ) ) &
356	ALLOCATE( mean_inflow_profiles(nzb:nzt+1,5) )
357
358	ALLOCATE ( a11(nzb:nzt+1), a21(nzb:nzt+1), a22(nzb:nzt+1), &
359	a31(nzb:nzt+1), a32(nzb:nzt+1), a33(nzb:nzt+1), &
360	nuy(nzb:nzt+1), nuz(nzb:nzt+1), nvy(nzb:nzt+1), &
361	nvz(nzb:nzt+1), nwy(nzb:nzt+1), nwz(nzb:nzt+1), &
362	tu(nzb:nzt+1), tv(nzb:nzt+1), tw(nzb:nzt+1) )
363
364	!
365	!-- Define MPI type used in stg_generate_seed_yz to gather vertical splitted
366	!-- velocity seeds
367	CALL MPI_TYPE_SIZE( MPI_REAL, realsize, ierr )
368	extent = 1 * realsize
369
370	! stg_type_yz: yz-slice with vertical bounds nzb:nzt+1
371	CALL MPI_TYPE_CREATE_SUBARRAY( 2, [nzt-nzb+2,nyng-nysg+1], &
372	[1,nyng-nysg+1], [0,0], MPI_ORDER_FORTRAN, MPI_REAL, newtype, ierr )
373	CALL MPI_TYPE_CREATE_RESIZED( newtype, tob, extent, stg_type_yz, ierr )
374	CALL MPI_TYPE_COMMIT( stg_type_yz, ierr )
375	CALL MPI_TYPE_FREE( newtype, ierr )
376
377	! stg_type_yz_small: yz-slice with vertical bounds nzb_x:nzt_x+1
378	CALL MPI_TYPE_CREATE_SUBARRAY( 2, [nzt_x-nzb_x+2,nyng-nysg+1], &
379	[1,nyng-nysg+1], [0,0], MPI_ORDER_FORTRAN, MPI_REAL, newtype, ierr )
380	CALL MPI_TYPE_CREATE_RESIZED( newtype, tob, extent, stg_type_yz_small, ierr )
381	CALL MPI_TYPE_COMMIT( stg_type_yz_small, ierr )
382	CALL MPI_TYPE_FREE( newtype, ierr )
383
384	! receive count and displacement for MPI_GATHERV in stg_generate_seed_yz
385	ALLOCATE( recv_count(pdims(1)), displs(pdims(1)) )
386
387	recv_count = nzt_x-nzb_x + 1
388	recv_count(pdims(1)) = recv_count(pdims(1)) + 1
389
390	DO j = 1, pdims(1)
391	displs(j) = 0 + (nzt_x-nzb_x+1) * (j-1)
392	ENDDO
393
394	!
395	!-- Define seed of random number
396	CALL RANDOM_SEED()
397	CALL RANDOM_SEED( size=nseed )
398	ALLOCATE( seed(1:nseed) )
399	DO j = 1, nseed
400	seed(j) = startseed + j
401	ENDDO
402	CALL RANDOM_SEED(put=seed)
403
404	!
405	!-- Read inflow profile
406	!-- Height levels of profiles in input profile is as follows:
407	!-- zu: luy, luz, tu, lvy, lvz, tv, r11, r21, r22, d1, d2, d5
408	!-- zw: lwy, lwz, tw, r31, r32, r33, d3
409	!-- WARNING: zz is not used at the moment
410	OPEN( 24, FILE='STG_PROFILES'//TRIM( coupling_char ), STATUS='OLD', &
411	FORM='FORMATTED')
412
413	! Skip header
414	READ( 24, * )
415
416	DO k = nzb, nzt+1
417	READ( 24, * ) zz, luy, luz, tu(k), lvy, lvz, tv(k), lwy, lwz, tw(k), &
418	r11(k), r21(k), r22(k), r31(k), r32(k), r33(k), &
419	d1, d2, d3, d5
420
421	!
422	!-- Convert length scales from meter to number of grid points
423	nuy(k) = INT( luy * ddy )
424	nuz(k) = INT( luz / dz )
425	nvy(k) = INT( lvy * ddy )
426	nvz(k) = INT( lvz / dz )
427	nwy(k) = INT( lwy * ddy )
428	nwz(k) = INT( lwz / dz )
429
430	!
431	!-- Save Mean inflow profiles
432	IF ( TRIM( initializing_actions ) /= 'read_restart_data' ) THEN
433	mean_inflow_profiles(k,1) = d1
434	mean_inflow_profiles(k,2) = d2
435	! mean_inflow_profiles(k,4) = d4
436	mean_inflow_profiles(k,5) = d5
437	ENDIF
438	ENDDO
439
440	CLOSE(24)
441
442	!
443	!-- Assign initial profiles
444	u_init = mean_inflow_profiles(:,1)
445	v_init = mean_inflow_profiles(:,2)
446	! pt_init = mean_inflow_profiles(:,4)
447	e_init = MAXVAL( mean_inflow_profiles(:,5) )
448
449	!
450	!-- Calculate coefficient matrix from Reynolds stress tensor (Lund rotation)
451	DO k = nzb, nzt+1
452	IF ( r11(k) > 0.0_wp ) THEN
453	a11(k) = SQRT( r11(k) )
454	a21(k) = r21(k) / a11(k)
455	ELSE
456	a11(k) = 0.0_wp
457	a21(k) = 0.0_wp
458	ENDIF
459
460	a22(k) = r22(k) - a21(k)**2
461	IF ( a22(k) > 0.0_wp ) THEN
462	a22(k) = SQRT( a22(k) )
463	a32(k) = ( r32(k) - a21(k) * a31(k) ) / a22(k)
464	ELSE
465	a22(k) = 0.0_wp
466	a32(k) = 0.0_wp
467	ENDIF
468
469	!
470	!-- a31, a32, a33 must be calculated with interpolated a11, a21, a22 (d11,
471	!-- d21, d22) because of different vertical grid
472	IF ( k .le. nzt ) THEN
473	d11 = 0.5_wp * ( r11(k) + r11(k+1) )
474	IF ( d11 > 0.0_wp ) THEN
475	d11 = SQRT( d11 )
476	d21 = ( 0.5_wp * ( r21(k) + r21(k+1) ) ) / d11
477	a31(k) = r31(k) / d11
478	ELSE
479	d21 = 0.0_wp
480	a31(k) = 0.0_wp
481	ENDIF
482
483	d22 = 0.5_wp * ( r22(k) + r22(k+1) ) - d21 ** 2
484	IF ( d22 > 0.0_wp ) THEN
485	a32(k) = ( r32(k) - d21 * a31(k) ) / SQRT( d22 )
486	ELSE
487	a32(k) = 0.0_wp
488	ENDIF
489
490	a33(k) = r33(k) - a31(k) 2 - a32(k) 2
491	IF ( a33(k) > 0.0_wp ) THEN
492	a33(k) = SQRT( a33(k) )
493	ELSE
494	a33(k) = 0.0_wp
495	ENDIF
496	ELSE
497	a31(k) = a31(k-1)
498	a32(k) = a32(k-1)
499	a33(k) = a33(k-1)
500	ENDIF
501
502	ENDDO
503
504	!
505	!-- Define the size of the filter functions and allocate them.
506	merg = 0
507
508	! arrays must be large enough to cover the largest length scale
509	DO k = nzb, nzt+1
510	j = MAX( ABS(nuy(k)), ABS(nuz(k)), &
511	ABS(nvy(k)), ABS(nvz(k)), &
512	ABS(nwy(k)), ABS(nwz(k)) )
513	IF ( j > merg ) merg = j
514	ENDDO
515
516	merg = 2 * merg
517	mergp = merg + nbgp
518
519	ALLOCATE ( buy(-merg:merg,nzb:nzt+1), buz(-merg:merg,nzb:nzt+1), &
520	bvy(-merg:merg,nzb:nzt+1), bvz(-merg:merg,nzb:nzt+1), &
521	bwy(-merg:merg,nzb:nzt+1), bwz(-merg:merg,nzb:nzt+1) )
522
523	!
524	!-- Allocate velocity seeds
525	ALLOCATE ( fu( nzb:nzt+1,nysg:nyng), fuo(nzb:nzt+1,nysg:nyng), &
526	fv( nzb:nzt+1,nysg:nyng), fvo(nzb:nzt+1,nysg:nyng), &
527	fw( nzb:nzt+1,nysg:nyng), fwo(nzb:nzt+1,nysg:nyng) )
528
529	fu = 0._wp
530	fuo = 0._wp
531	fv = 0._wp
532	fvo = 0._wp
533	fw = 0._wp
534	fwo = 0._wp
535
536	!
537	!-- Create filter functions
538	CALL stg_filter_func( nuy, buy ) !filter uy
539	CALL stg_filter_func( nuz, buz ) !filter uz
540	CALL stg_filter_func( nvy, bvy ) !filter vy
541	CALL stg_filter_func( nvz, bvz ) !filter vz
542	CALL stg_filter_func( nwy, bwy ) !filter wy
543	CALL stg_filter_func( nwz, bwz ) !filter wz
544
545	#if defined( __parallel )
546	CALL MPI_BARRIER( comm2d, ierr )
547	#endif
548
549	!
550	!-- In case of restart, calculate velocity seeds fu, fv, fw from former
551	! time step.
552	! Bug: fu, fv, fw are different in those heights where a11, a22, a33
553	! are 0 compared to the prerun. This is mostly for k=nzt+1.
554	IF ( TRIM( initializing_actions ) == 'read_restart_data' ) THEN
555	IF ( myidx == id_inflow ) THEN
556	DO j = nysg, nyng
557	DO k = nzb, nzt+1
558
559	IF ( a11(k) .NE. 0._wp ) THEN
560	fu(k,j) = ( u(k,j,-1) / mc_factor - &
561	mean_inflow_profiles(k,1) ) / a11(k)
562	ELSE
563	fu(k,j) = 0._wp
564	ENDIF
565
566	IF ( a22(k) .NE. 0._wp ) THEN
567	fv(k,j) = ( v(k,j,-1) / mc_factor - a21(k) * fu(k,j) - &
568	mean_inflow_profiles(k,2) ) / a22(k)
569	ELSE
570	fv(k,j) = 0._wp
571	ENDIF
572
573	IF ( a33(k) .NE. 0._wp ) THEN
574	fw(k,j) = ( w(k,j,-1) / mc_factor - a31(k) * fu(k,j) - &
575	a32(k) * fv(k,j) ) / a33(k)
576	ELSE
577	fw = 0._wp
578	ENDIF
579
580	ENDDO
581	ENDDO
582	ENDIF
583	ENDIF
584
585	CALL cpu_log( log_point(57), 'synthetic_turbulence_gen', 'stop' )
586
587	END SUBROUTINE stg_init
588
589
590	!------------------------------------------------------------------------------!
591	! Description:
592	! ------------
593	!> Calculate filter function bxx from length scale nxx following Eg.9 and 10
594	!> (Xie and Castro, 2008)
595	!------------------------------------------------------------------------------!
596	SUBROUTINE stg_filter_func( nxx, bxx )
597
598
599	IMPLICIT NONE
600
601	INTEGER(iwp) :: k !< loop index
602	INTEGER(iwp) :: n_k !< length scale nXX in height k
603	INTEGER(iwp) :: n_k2 !< n_k * 2
604	INTEGER(iwp) :: nf !< index for length scales
605
606	REAL(wp) :: bdenom !< denominator for filter functions bXX
607	REAL(wp) :: qsi = 1.0_wp !< minimization factor
608
609	INTEGER(iwp), DIMENSION(:) :: nxx(nzb:nzt+1) !< length scale (in gp)
610
611	REAL(wp), DIMENSION(:,:) :: bxx(-merg:merg,nzb:nzt+1) !< filter function
612
613
614	bxx = 0.0_wp
615
616	DO k = nzb, nzt+1
617	bdenom = 0.0_wp
618	n_k = nxx(k)
619	IF ( n_k /= 0 ) THEN
620	n_k2 = n_k * 2
621
622	!
623	!-- ( Eq.10 )^2
624	DO nf = -n_k2, n_k2
625	bdenom = bdenom + EXP( -qsi * pi * ABS(nf) / n_k )**2
626	ENDDO
627
628	!
629	!-- ( Eq.9 )
630	bdenom = SQRT( bdenom )
631	DO nf = -n_k2, n_k2
632	bxx(nf,k) = EXP( -qsi * pi * ABS(nf) / n_k ) / bdenom
633	ENDDO
634	ENDIF
635	ENDDO
636
637	END SUBROUTINE stg_filter_func
638
639
640	!------------------------------------------------------------------------------!
641	! Description:
642	! ------------
643	!> Parin for &stg_par for synthetic turbulence generator
644	!------------------------------------------------------------------------------!
645	SUBROUTINE stg_parin
646
647
648	IMPLICIT NONE
649
650	CHARACTER (LEN=80) :: line !< dummy string that contains the current line of the parameter file
651
652
653	NAMELIST /stg_par/ use_synthetic_turbulence_generator
654
655	line = ' '
656
657	!
658	!-- Try to find stg package
659	REWIND ( 11 )
660	line = ' '
661	DO WHILE ( INDEX( line, '&stg_par' ) == 0 )
662	READ ( 11, '(A)', END=10 ) line
663	ENDDO
664	BACKSPACE ( 11 )
665
666	!
667	!-- Read namelist
668	READ ( 11, stg_par )
669
670	!
671	!-- Set flag that indicates that the synthetic turbulence generator is switched
672	!-- on
673	synthetic_turbulence_generator = .TRUE.
674
675	IF ( TRIM( initializing_actions ) == 'read_restart_data' ) THEN
676	CALL stg_read_restart_data
677	ENDIF
678
679	10 CONTINUE
680
681	END SUBROUTINE stg_parin
682
683
684	!------------------------------------------------------------------------------!
685	! Description:
686	! ------------
687	!> Skipping the stg variables from restart-file (binary format).
688	!------------------------------------------------------------------------------!
689	SUBROUTINE stg_skip_var_list
690
691	IMPLICIT NONE
692
693	CHARACTER (LEN=1) :: cdum
694	CHARACTER (LEN=30) :: variable_chr
695
696	READ ( 13 ) variable_chr
697
698	DO WHILE ( TRIM( variable_chr ) /= '* end stg module *' )
699
700	READ ( 13 ) cdum
701	READ ( 13 ) variable_chr
702
703	ENDDO
704
705	END SUBROUTINE stg_skip_var_list
706
707
708	!------------------------------------------------------------------------------!
709	! Description:
710	! ------------
711	!> This routine reads the respective restart data.
712	!------------------------------------------------------------------------------!
713	SUBROUTINE stg_read_restart_data
714
715
716	IMPLICIT NONE
717
718	CHARACTER (LEN=30) :: variable_chr !< dummy variable to read string
719
720
721	READ ( 13 ) variable_chr
722	DO WHILE ( TRIM( variable_chr ) /= '* end stg module *' )
723
724	SELECT CASE ( TRIM( variable_chr ) )
725
726	CASE ( 'use_synthetic_turbulence_generator ' )
727	READ ( 13 ) use_synthetic_turbulence_generator
728	CASE ( 'mc_factor' )
729	READ ( 13 ) mc_factor
730
731	END SELECT
732
733	READ ( 13 ) variable_chr
734
735	ENDDO
736
737	END SUBROUTINE stg_read_restart_data
738
739
740	!------------------------------------------------------------------------------!
741	! Description:
742	! ------------
743	!> This routine writes the respective restart data.
744	!------------------------------------------------------------------------------!
745	SUBROUTINE stg_write_restart_data
746
747
748	IMPLICIT NONE
749
750	WRITE ( 14 ) 'use_synthetic_turbulence_generator '
751	WRITE ( 14 ) use_synthetic_turbulence_generator
752	WRITE ( 14 ) 'mc_factor '
753	WRITE ( 14 ) mc_factor
754
755	WRITE ( 14 ) '* end stg module * '
756
757	END SUBROUTINE stg_write_restart_data
758
759
760	!------------------------------------------------------------------------------!
761	! Description:
762	! ------------
763	!> Create turbulent inflow fields for u, v, w with prescribed length scales and
764	!> Reynolds stress tensor after a method of Xie and Castro (2008), modified
765	!> following suggestions of Kim et al. (2013), and using a Lund rotation
766	!> (Lund, 1998).
767	!------------------------------------------------------------------------------!
768	SUBROUTINE stg_main
769
770
771	USE arrays_3d, &
772	ONLY: dzw
773
774	USE control_parameters, &
775	ONLY: dt_3d, intermediate_timestep_count, simulated_time, &
776	volume_flow_initial
777
778	USE indices, &
779	ONLY: nyn, nys
780
781	USE statistics, &
782	ONLY: weight_substep
783
784
785	IMPLICIT NONE
786
787	INTEGER(iwp) :: j !< loop index in y-direction
788	INTEGER(iwp) :: k !< loop index in z-direction
789
790	REAL(wp) :: dt_stg !< wheighted subtimestep
791	REAL(wp) :: mc_factor_l !< local mass flux correction factor
792
793	REAL(wp), DIMENSION(nzb:nzt+1,nysg:nyng,5,nbgp) :: inflow_dist !< disturbance for inflow profiles
794
795
796	CALL cpu_log( log_point(57), 'synthetic_turbulence_gen', 'start' )
797
798	!
799	!-- Calculate time step which is needed for filter functions
800	dt_stg = dt_3d * weight_substep(intermediate_timestep_count)
801
802	!
803	!-- Initial value of fu, fv, fw
804	IF ( simulated_time == 0.0_wp .AND. .NOT. velocity_seed_initialized ) THEN
805	CALL stg_generate_seed_yz( nuy, nuz, buy, buz, fu )
806	CALL stg_generate_seed_yz( nvy, nvz, bvy, bvz, fv )
807	CALL stg_generate_seed_yz( nwy, nwz, bwy, bwz, fw )
808	velocity_seed_initialized = .TRUE.
809	ENDIF
810	!
811	!-- New set of fu, fv, fw
812	CALL stg_generate_seed_yz( nuy, nuz, buy, buz, fuo )
813	CALL stg_generate_seed_yz( nvy, nvz, bvy, bvz, fvo )
814	CALL stg_generate_seed_yz( nwy, nwz, bwy, bwz, fwo )
815
816	IF ( myidx == id_inflow ) THEN
817
818	DO j = nysg, nyng
819	DO k = nzb, nzt + 1
820	!
821	!-- Update fu, fv, fw following Eq. 14 of Xie and Castro (2008)
822	IF ( tu(k) == 0.0_wp ) THEN
823	fu(k,j) = fuo(k,j)
824	ELSE
825	fu(k,j) = fu(k,j) * EXP( -pi * dt_stg * 0.5_wp / tu(k) ) + &
826	fuo(k,j) * SQRT( 1.0_wp - EXP( -pi * dt_stg / tu(k) ) )
827	ENDIF
828
829	IF ( tv(k) == 0.0_wp ) THEN
830	fv(k,j) = fvo(k,j)
831	ELSE
832	fv(k,j) = fv(k,j) * EXP( -pi * dt_stg * 0.5_wp / tv(k) ) + &
833	fvo(k,j) * SQRT( 1.0_wp - EXP( -pi * dt_stg / tv(k) ) )
834	ENDIF
835
836	IF ( tw(k) == 0.0_wp ) THEN
837	fw(k,j) = fwo(k,j)
838	ELSE
839	fw(k,j) = fw(k,j) * EXP( -pi * dt_stg * 0.5_wp / tw(k) ) + &
840	fwo(k,j) * SQRT( 1.0_wp - EXP( -pi * dt_stg / tw(k) ) )
841	ENDIF
842	!
843	!-- Lund rotation following Eq. 17 in Xie and Castro (2008).
844	!-- Additional factors are added to improve the variance of v and w
845	IF( k == 0 ) THEN
846	inflow_dist(k,j,1,1) = 0.0_wp
847	inflow_dist(k,j,2,1) = 0.0_wp
848	inflow_dist(k,j,3,1) = 0.0_wp
849	inflow_dist(k,j,4,1) = 0.0_wp
850	inflow_dist(k,j,5,1) = 0.0_wp
851	ELSE
852	inflow_dist(k,j,1,1) = a11(k) * fu(k,j)
853	!experimental test of 1.2
854	inflow_dist(k,j,2,1) = ( SQRT( a22(k) / MAXVAL(a22) ) &
855	* 1.2_wp ) &
856	* ( a21(k) * fu(k,j) &
857	+ a22(k) * fv(k,j) )
858	inflow_dist(k,j,3,1) = ( SQRT(a33(k) / MAXVAL(a33) ) &
859	* 1.3_wp ) &
860	* ( a31(k) * fu(k,j) &
861	+ a32(k) * fv(k,j) &
862	+ a33(k) * fw(k,j) )
863	! Calculation for pt and e not yet implemented
864	inflow_dist(k,j,4,1) = 0.0_wp
865	inflow_dist(k,j,5,1) = 0.0_wp
866	ENDIF
867
868	ENDDO
869	ENDDO
870
871	!
872	!-- Mass flux correction following Kim et al. (2013)
873	!-- This correction factor insures that the mass flux is preserved at the
874	!-- inflow boundary
875	mc_factor_l = 0.0_wp
876	mc_factor = 0.0_wp
877	DO j = nys, nyn
878	DO k = nzb+1, nzt
879	mc_factor_l = mc_factor_l + dzw(k) * &
880	( mean_inflow_profiles(k,1) + inflow_dist(k,j,1,1) )
881	ENDDO
882	ENDDO
883
884	#if defined( __parallel )
885	CALL MPI_ALLREDUCE( mc_factor_l, mc_factor, &
886	1, MPI_REAL, MPI_SUM, comm1dy, ierr )
887	#else
888	mc_factor = mc_factor_l
889	#endif
890
891	mc_factor = volume_flow_initial(1) / mc_factor
892
893	!
894	!-- Add disturbance at the inflow
895	DO j = nysg, nyng
896	DO k = nzb, nzt+1
897	u(k,j,-nbgp+1:0) = ( mean_inflow_profiles(k,1) + &
898	inflow_dist(k,j,1,1) ) * mc_factor
899	v(k,j,-nbgp:-1) = ( mean_inflow_profiles(k,2) + &
900	inflow_dist(k,j,2,1) ) * mc_factor
901	w(k,j,-nbgp:-1) = inflow_dist(k,j,3,1) * mc_factor
902	ENDDO
903	ENDDO
904
905	ENDIF
906
907	CALL cpu_log( log_point(57), 'synthetic_turbulence_gen', 'stop' )
908
909	END SUBROUTINE stg_main
910
911
912	!------------------------------------------------------------------------------!
913	! Description:
914	! ------------
915	!> Generate a set of random number rand_it wich is equal on each PE
916	!> and calculate the velocity seed f_n.
917	!> f_n is splitted in vertical direction by the number of PEs in x-direction and
918	!> and each PE calculates a vertical subsection of f_n. At the the end, all
919	!> parts are collected to form the full array.
920	!------------------------------------------------------------------------------!
921	SUBROUTINE stg_generate_seed_yz( n_y, n_z, b_y, b_z, f_n )
922
923
924	USE indices, &
925	ONLY: ny
926
927
928	IMPLICIT NONE
929
930	INTEGER(iwp) :: j !< loop index in y-direction
931	INTEGER(iwp) :: jj !< loop index in y-direction
932	INTEGER(iwp) :: k !< loop index in z-direction
933	INTEGER(iwp) :: kk !< loop index in z-direction
934	INTEGER(iwp) :: send_count !< send count for MPI_GATHERV
935
936	INTEGER(iwp), DIMENSION(nzb:nzt+1) :: n_y !< length scale in y-direction
937	INTEGER(iwp), DIMENSION(nzb:nzt+1) :: n_z !< length scale in z-direction
938	INTEGER(iwp), DIMENSION(nzb:nzt+1) :: n_y2 !< n_y*2
939	INTEGER(iwp), DIMENSION(nzb:nzt+1) :: n_z2 !< n_z*2
940
941	REAL(wp) :: nyz_inv !< inverse of number of grid points in yz-slice
942	REAL(wp) :: rand_av !< average of random number
943	REAL(wp) :: rand_sigma_inv !< inverse of stdev of random number
944
945	REAL(wp), DIMENSION(-merg:merg,nzb:nzt+1) :: b_y !< filter func in y-dir
946	REAL(wp), DIMENSION(-merg:merg,nzb:nzt+1) :: b_z !< filter func in z-dir
947	REAL(wp), DIMENSION(nzb_x:nzt_x+1,nysg:nyng) :: f_n_l !< local velocity seed
948	REAL(wp), DIMENSION(nzb:nzt+1,nysg:nyng) :: f_n !< velocity seed
949	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: rand_it !< random number
950
951
952	!
953	!-- Generate random numbers using a seed generated in stg_init.
954	!-- The set of random numbers are modified to have an average of 0 and
955	!-- unit variance.
956	ALLOCATE( rand_it(nzb-mergp:nzt+1+mergp,-mergp:ny+mergp) )
957
958	rand_av = 0.0_wp
959	rand_sigma_inv = 0.0_wp
960	nyz_inv = 1.0_wp / REAL( ( nzt+1 - nzb+1 ) * ( ny+1 ), KIND=wp )
961
962	DO j = 0, ny
963	DO k = nzb, nzt+1
964	CALL RANDOM_NUMBER( rand_it(k,j) )
965	rand_av = rand_av + rand_it(k,j)
966	ENDDO
967	ENDDO
968
969	rand_av = rand_av * nyz_inv
970
971	DO j = 0, ny
972	DO k = nzb, nzt+1
973	rand_it(k,j) = rand_it(k,j) - rand_av
974	rand_sigma_inv = rand_sigma_inv + rand_it(k,j) ** 2
975	ENDDO
976	ENDDO
977
978	rand_sigma_inv = 1.0_wp / SQRT(rand_sigma_inv * nyz_inv)
979
980	DO j = 0, ny
981	DO k = nzb, nzt+1
982	rand_it(k,j) = rand_it(k,j) * rand_sigma_inv
983	ENDDO
984	ENDDO
985
986	!
987	!-- Periodic fill of random number in space
988	DO j = 0, ny
989	DO k = 1, mergp
990	rand_it(nzb -k,j) = rand_it(nzt+2-k,j) ! bottom margin
991	rand_it(nzt+1+k,j) = rand_it(nzb+k-1,j) ! top margin
992	ENDDO
993	ENDDO
994	DO j = 1, mergp
995	DO k = nzb-mergp, nzt+1+mergp
996	rand_it(k, -j) = rand_it(k,ny-j+1) ! south margin
997	rand_it(k,ny+j) = rand_it(k, j-1) ! north margin
998	ENDDO
999	ENDDO
1000
1001	!
1002	!-- Generate velocity seed following Eq.6 of Xie and Castro (2008)
1003	n_y2 = n_y * 2
1004	n_z2 = n_z * 2
1005	f_n_l = 0.0_wp
1006
1007	DO j = nysg, nyng
1008	DO k = nzb_x, nzt_x+1
1009	DO jj = -n_y2(k), n_y2(k)
1010	DO kk = -n_z2(k), n_z2(k)
1011	f_n_l(k,j) = f_n_l(k,j) &
1012	+ b_y(jj,k) * b_z(kk,k) * rand_it(k+kk,j+jj)
1013	ENDDO
1014	ENDDO
1015	ENDDO
1016	ENDDO
1017
1018	DEALLOCATE( rand_it )
1019
1020	!
1021	!-- Gather velocity seeds of full subdomain
1022	send_count = nzt_x - nzb_x + 1
1023	IF ( nzt_x == nzt ) send_count = send_count + 1
1024
1025	#if defined( __parallel )
1026	CALL MPI_GATHERV( f_n_l(nzb_x,nysg), send_count, stg_type_yz_small, &
1027	f_n(nzb+1,nysg), recv_count, displs, stg_type_yz, &
1028	id_inflow, comm1dx, ierr )
1029	#else
1030	f_n(nzb+1:nzt+1,nysg:nyng) = f_n_l(nzb_x:nzt_x+1,nysg:nyng)
1031	#endif
1032
1033
1034	END SUBROUTINE stg_generate_seed_yz
1035
1036	END MODULE synthetic_turbulence_generator_mod

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