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source: palm/trunk/SOURCE/synthetic_turbulence_generator_mod.f90 @ 2794

Last change on this file since 2794 was 2776, checked in by Giersch, 7 years ago
Skipping of module related restart data changed + adapting synthetic turbulence generator to current restart procedure
Property svn:keywords set to `Id`
File size: 35.9 KB

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1	!> @synthetic_turbulence_generator_mod.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 2017 Leibniz Universitaet Hannover
18	!------------------------------------------------------------------------------!
19	!
20	! Current revisions:
21	! -----------------
22	!
23	!
24	! Former revisions:
25	! -----------------
26	! $Id: synthetic_turbulence_generator_mod.f90 2776 2018-01-31 10:44:42Z knoop $
27	! Variable synthetic_turbulence_generator use_synthetic_turbulence_generator has
28	! been abbreviated + syn_turb_gen_prerun flag is used to define if module
29	! related parameters were outputted as restart data
30	!
31	! 2716 2017-12-29 16:35:59Z kanani
32	! Corrected "Former revisions" section
33	!
34	! 2696 2017-12-14 17:12:51Z kanani
35	! Change in file header (GPL part)
36	!
37	! 2669 2017-12-06 16:03:27Z raasch
38	! unit number for file containing turbulence generator data changed to 90
39	! bugfix: preprocessor directives added for MPI specific code
40	!
41	! 2576 2017-10-24 13:49:46Z Giersch
42	! Definition of a new function called stg_skip_var_list to skip module
43	! parameters during reading restart data
44	!
45	! 2563 2017-10-19 15:36:10Z Giersch
46	! stg_read_restart_data is called in stg_parin in the case of a restart run
47	!
48	! 2259 2017-06-08 09:09:11Z gronemeier
49	! Initial revision
50	!
51	!
52	!
53	! Authors:
54	! --------
55	! @author Tobias Gronemeier, Atsushi Inagaki, Micha Gryschka, Christoph Knigge
56	!
57	!
58	! Description:
59	! ------------
60	!> The module generates turbulence at the inflow boundary based on a method by
61	!> Xie and Castro (2008) utilizing a Lund rotation (Lund, 1998) and a mass-flux
62	!> correction by Kim et al. (2013).
63	!> The turbulence is correlated based on length scales in y- and z-direction and
64	!> a time scale for each velocity component. The profiles of length and time
65	!> scales, mean u, v, w, e and pt, and all components of the Reynolds stress
66	!> tensor are read from file STG_PROFILES.
67	!>
68	!> @todo test restart
69	!> enable cyclic_fill
70	!> implement turbulence generation for e and pt
71	!> @note <Enter notes on the module>
72	!> @bug Height information from input file is not used. Profiles from input
73	!> must match with current PALM grid.
74	!> Transformation of length scales to number of gridpoints does not
75	!> consider grid stretching.
76	!> In case of restart, velocity seeds differ from precursor run if a11,
77	!> a22, or a33 are zero.
78	!------------------------------------------------------------------------------!
79	MODULE synthetic_turbulence_generator_mod
80
81
82	USE arrays_3d, &
83	ONLY: mean_inflow_profiles, u, v, w
84
85	USE constants, &
86	ONLY: pi
87
88	USE control_parameters, &
89	ONLY: initializing_actions, message_string, &
90	syn_turb_gen, syn_turb_gen_prerun
91
92	USE cpulog, &
93	ONLY: cpu_log, log_point, log_point_s
94
95	USE indices, &
96	ONLY: nbgp, nzb, nzt, nyng, nysg
97
98	USE kinds
99
100	USE MPI
101
102	USE pegrid, &
103	ONLY: comm1dx, comm1dy, comm2d, id_inflow, ierr, myidx, pdims
104
105	USE transpose_indices, &
106	ONLY: nzb_x, nzt_x
107
108
109	IMPLICIT NONE
110
111	LOGICAL :: velocity_seed_initialized = .FALSE. !< true after first call of stg_main
112	LOGICAL :: use_syn_turb_gen = .FALSE. !< switch to use synthetic turbulence generator
113
114	INTEGER(iwp) :: stg_type_yz !< MPI type for full z range
115	INTEGER(iwp) :: stg_type_yz_small !< MPI type for small z range
116	INTEGER(iwp) :: merg !< maximum length scale (in gp)
117	INTEGER(iwp) :: mergp !< merg + nbgp
118
119	REAL(wp) :: mc_factor !< mass flux correction factor
120
121	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: displs !< displacement for MPI_GATHERV
122	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: recv_count !< receive count for MPI_GATHERV
123	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nuy !< length scale of u in y direction (in gp)
124	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nuz !< length scale of u in z direction (in gp)
125	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nvy !< length scale of v in y direction (in gp)
126	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nvz !< length scale of v in z direction (in gp)
127	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nwy !< length scale of w in y direction (in gp)
128	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: nwz !< length scale of w in z direction (in gp)
129
130	INTEGER(iwp), DIMENSION(:), ALLOCATABLE :: seed !< seed of random number for rn-generator
131
132	REAL(wp), DIMENSION(:), ALLOCATABLE :: a11 !< coefficient for Lund rotation
133	REAL(wp), DIMENSION(:), ALLOCATABLE :: a21 !< coefficient for Lund rotation
134	REAL(wp), DIMENSION(:), ALLOCATABLE :: a22 !< coefficient for Lund rotation
135	REAL(wp), DIMENSION(:), ALLOCATABLE :: a31 !< coefficient for Lund rotation
136	REAL(wp), DIMENSION(:), ALLOCATABLE :: a32 !< coefficient for Lund rotation
137	REAL(wp), DIMENSION(:), ALLOCATABLE :: a33 !< coefficient for Lund rotation
138	REAL(wp), DIMENSION(:), ALLOCATABLE :: tu !< Lagrangian time scale of u
139	REAL(wp), DIMENSION(:), ALLOCATABLE :: tv !< Lagrangian time scale of v
140	REAL(wp), DIMENSION(:), ALLOCATABLE :: tw !< Lagrangian time scale of w
141
142	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: buy !< filter function for u in y direction
143	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: buz !< filter function for u in z direction
144	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: bvy !< filter function for v in y direction
145	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: bvz !< filter function for v in z direction
146	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: bwy !< filter function for w in y direction
147	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: bwz !< filter function for w in z direction
148	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: fu !< velocity seed for u
149	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: fuo !< velocity seed for u with new random number
150	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: fv !< velocity seed for v
151	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: fvo !< velocity seed for v with new random number
152	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: fw !< velocity seed for w
153	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: fwo !< velocity seed for w with new random number
154
155
156	!
157	!-- PALM interfaces:
158	!-- Input parameter checks to be done in check_parameters
159	INTERFACE stg_check_parameters
160	MODULE PROCEDURE stg_check_parameters
161	END INTERFACE stg_check_parameters
162
163	!
164	!-- Calculate filter functions
165	INTERFACE stg_filter_func
166	MODULE PROCEDURE stg_filter_func
167	END INTERFACE stg_filter_func
168
169	!
170	!-- Generate velocity seeds
171	INTERFACE stg_generate_seed_yz
172	MODULE PROCEDURE stg_generate_seed_yz
173	END INTERFACE stg_generate_seed_yz
174
175	!
176	!-- Output of information to the header file
177	INTERFACE stg_header
178	MODULE PROCEDURE stg_header
179	END INTERFACE stg_header
180
181	!
182	!-- Initialization actions
183	INTERFACE stg_init
184	MODULE PROCEDURE stg_init
185	END INTERFACE stg_init
186
187	!
188	!-- Main procedure of synth. turb. gen.
189	INTERFACE stg_main
190	MODULE PROCEDURE stg_main
191	END INTERFACE stg_main
192
193	!
194	!-- Reading of NAMELIST parameters
195	INTERFACE stg_parin
196	MODULE PROCEDURE stg_parin
197	END INTERFACE stg_parin
198
199	!
200	!-- Skipping of parameters for restart runs
201	INTERFACE stg_skip_var_list
202	MODULE PROCEDURE stg_skip_var_list
203	END INTERFACE stg_skip_var_list
204
205	!
206	!-- Reading of parameters for restart runs
207	INTERFACE stg_read_restart_data
208	MODULE PROCEDURE stg_read_restart_data
209	END INTERFACE stg_read_restart_data
210
211	!
212	!-- Writing of binary output for restart runs
213	INTERFACE stg_write_restart_data
214	MODULE PROCEDURE stg_write_restart_data
215	END INTERFACE stg_write_restart_data
216
217	SAVE
218
219	PRIVATE
220
221	!
222	!-- Public interfaces
223	PUBLIC stg_check_parameters, stg_header, stg_init, stg_main, stg_parin, &
224	stg_write_restart_data, stg_skip_var_list
225
226	!
227	!-- Public variables
228	PUBLIC use_syn_turb_gen
229
230
231	CONTAINS
232
233
234	!------------------------------------------------------------------------------!
235	! Description:
236	! ------------
237	!> Check parameters routine for synthetic turbulence generator
238	!------------------------------------------------------------------------------!
239	SUBROUTINE stg_check_parameters
240
241
242	USE control_parameters, &
243	ONLY: bc_lr, bc_ns, turbulent_inflow
244
245
246	IMPLICIT NONE
247
248	IF ( use_syn_turb_gen ) THEN
249
250	IF ( INDEX( initializing_actions, 'set_constant_profiles' ) == 0 .AND. &
251	INDEX( initializing_actions, 'read_restart_data' ) == 0 ) THEN
252	message_string = 'Using synthetic turbulence generator ' // &
253	'requires &initializing_actions = ' // &
254	'"set_constant_profiles" or "read_restart_data"'
255	CALL message( 'stg_check_parameters', 'PA0015', 1, 2, 0, 6, 0 )
256	ENDIF
257
258	IF ( bc_lr /= 'dirichlet/radiation' ) THEN
259	message_string = 'Using synthetic turbulence generator ' // &
260	'requires &bc_lr = "dirichlet/radiation"'
261	CALL message( 'stg_check_parameters', 'PA0035', 1, 2, 0, 6, 0 )
262	ENDIF
263	IF ( bc_ns /= 'cyclic' ) THEN
264	message_string = 'Using synthetic turbulence generator ' // &
265	'requires &bc_ns = "cyclic"'
266	CALL message( 'stg_check_parameters', 'PA0037', 1, 2, 0, 6, 0 )
267	ENDIF
268	IF ( turbulent_inflow ) THEN
269	message_string = 'Using synthetic turbulence generator ' // &
270	'in combination &with turbulent_inflow = .T. ' // &
271	'is not allowed'
272	CALL message( 'stg_check_parameters', 'PA0039', 1, 2, 0, 6, 0 )
273	ENDIF
274
275	ENDIF
276
277	END SUBROUTINE stg_check_parameters
278
279
280	!------------------------------------------------------------------------------!
281	! Description:
282	! ------------
283	!> Header output for synthetic turbulence generator
284	!------------------------------------------------------------------------------!
285	SUBROUTINE stg_header ( io )
286
287
288	IMPLICIT NONE
289
290	INTEGER(iwp), INTENT(IN) :: io !< Unit of the output file
291
292	!
293	!-- Write synthetic turbulence generator Header
294	WRITE( io, 1 )
295	IF ( use_syn_turb_gen ) THEN
296	WRITE( io, 2 )
297	ELSE
298	WRITE( io, 3 )
299	ENDIF
300
301	1 FORMAT (//' Synthetic turbulence generator information:'/ &
302	' ------------------------------------------'/)
303	2 FORMAT (' synthetic turbulence generator switched on')
304	3 FORMAT (' synthetic turbulence generator switched off')
305
306	END SUBROUTINE stg_header
307
308
309	!------------------------------------------------------------------------------!
310	! Description:
311	! ------------
312	!> Initialization of the synthetic turbulence generator
313	!------------------------------------------------------------------------------!
314	SUBROUTINE stg_init
315
316
317	USE arrays_3d, &
318	ONLY: u_init, v_init
319
320	USE control_parameters, &
321	ONLY: coupling_char, dz, e_init
322
323	USE grid_variables, &
324	ONLY: ddy
325
326
327	IMPLICIT NONE
328
329	#if defined( __parallel )
330	INTEGER(KIND=MPI_ADDRESS_KIND) :: extent !< extent of new MPI type
331	INTEGER(KIND=MPI_ADDRESS_KIND) :: tob=0 !< dummy variable
332	#endif
333
334	INTEGER(iwp) :: j !> loop index
335	INTEGER(iwp) :: k !< index
336	INTEGER(iwp) :: newtype !< dummy MPI type
337	INTEGER(iwp) :: realsize !< size of REAL variables
338	INTEGER(iwp) :: nseed !< dimension of random number seed
339	INTEGER(iwp) :: startseed = 1234567890 !< start seed for random number generator
340
341	!
342	!-- Dummy variables used for reading profiles
343	REAL(wp) :: d1 !< u profile
344	REAL(wp) :: d2 !< v profile
345	REAL(wp) :: d3 !< w profile
346	REAL(wp) :: d5 !< e profile
347	REAL(wp) :: d11 !< vertical interpolation for a11
348	REAL(wp) :: d21 !< vertical interpolation for a21
349	REAL(wp) :: d22 !< vertical interpolation for a22
350	REAL(wp) :: luy !< length scale for u in y direction
351	REAL(wp) :: luz !< length scale for u in z direction
352	REAL(wp) :: lvy !< length scale for v in y direction
353	REAL(wp) :: lvz !< length scale for v in z direction
354	REAL(wp) :: lwy !< length scale for w in y direction
355	REAL(wp) :: lwz !< length scale for w in z direction
356	REAL(wp) :: zz !< height
357
358	REAL(wp),DIMENSION(nzb:nzt+1) :: r11 !< Reynolds parameter
359	REAL(wp),DIMENSION(nzb:nzt+1) :: r21 !< Reynolds parameter
360	REAL(wp),DIMENSION(nzb:nzt+1) :: r22 !< Reynolds parameter
361	REAL(wp),DIMENSION(nzb:nzt+1) :: r31 !< Reynolds parameter
362	REAL(wp),DIMENSION(nzb:nzt+1) :: r32 !< Reynolds parameter
363	REAL(wp),DIMENSION(nzb:nzt+1) :: r33 !< Reynolds parameter
364
365
366	#if defined( __parallel )
367	CALL MPI_BARRIER( comm2d, ierr )
368	#endif
369
370	CALL cpu_log( log_point(57), 'synthetic_turbulence_gen', 'start' )
371
372	IF ( .NOT. ALLOCATED( mean_inflow_profiles ) ) &
373	ALLOCATE( mean_inflow_profiles(nzb:nzt+1,5) )
374
375	ALLOCATE ( a11(nzb:nzt+1), a21(nzb:nzt+1), a22(nzb:nzt+1), &
376	a31(nzb:nzt+1), a32(nzb:nzt+1), a33(nzb:nzt+1), &
377	nuy(nzb:nzt+1), nuz(nzb:nzt+1), nvy(nzb:nzt+1), &
378	nvz(nzb:nzt+1), nwy(nzb:nzt+1), nwz(nzb:nzt+1), &
379	tu(nzb:nzt+1), tv(nzb:nzt+1), tw(nzb:nzt+1) )
380
381	#if defined( __parallel )
382	!
383	!-- Define MPI type used in stg_generate_seed_yz to gather vertical splitted
384	!-- velocity seeds
385	CALL MPI_TYPE_SIZE( MPI_REAL, realsize, ierr )
386	extent = 1 * realsize
387
388	! stg_type_yz: yz-slice with vertical bounds nzb:nzt+1
389	CALL MPI_TYPE_CREATE_SUBARRAY( 2, [nzt-nzb+2,nyng-nysg+1], &
390	[1,nyng-nysg+1], [0,0], MPI_ORDER_FORTRAN, MPI_REAL, newtype, ierr )
391	CALL MPI_TYPE_CREATE_RESIZED( newtype, tob, extent, stg_type_yz, ierr )
392	CALL MPI_TYPE_COMMIT( stg_type_yz, ierr )
393	CALL MPI_TYPE_FREE( newtype, ierr )
394
395	! stg_type_yz_small: yz-slice with vertical bounds nzb_x:nzt_x+1
396	CALL MPI_TYPE_CREATE_SUBARRAY( 2, [nzt_x-nzb_x+2,nyng-nysg+1], &
397	[1,nyng-nysg+1], [0,0], MPI_ORDER_FORTRAN, MPI_REAL, newtype, ierr )
398	CALL MPI_TYPE_CREATE_RESIZED( newtype, tob, extent, stg_type_yz_small, ierr )
399	CALL MPI_TYPE_COMMIT( stg_type_yz_small, ierr )
400	CALL MPI_TYPE_FREE( newtype, ierr )
401
402	! receive count and displacement for MPI_GATHERV in stg_generate_seed_yz
403	ALLOCATE( recv_count(pdims(1)), displs(pdims(1)) )
404
405	recv_count = nzt_x-nzb_x + 1
406	recv_count(pdims(1)) = recv_count(pdims(1)) + 1
407
408	DO j = 1, pdims(1)
409	displs(j) = 0 + (nzt_x-nzb_x+1) * (j-1)
410	ENDDO
411	#endif
412
413	!
414	!-- Define seed of random number
415	CALL RANDOM_SEED()
416	CALL RANDOM_SEED( size=nseed )
417	ALLOCATE( seed(1:nseed) )
418	DO j = 1, nseed
419	seed(j) = startseed + j
420	ENDDO
421	CALL RANDOM_SEED(put=seed)
422
423	!
424	!-- Read inflow profile
425	!-- Height levels of profiles in input profile is as follows:
426	!-- zu: luy, luz, tu, lvy, lvz, tv, r11, r21, r22, d1, d2, d5
427	!-- zw: lwy, lwz, tw, r31, r32, r33, d3
428	!-- WARNING: zz is not used at the moment
429	OPEN( 90, FILE='STG_PROFILES'//TRIM( coupling_char ), STATUS='OLD', &
430	FORM='FORMATTED')
431
432	! Skip header
433	READ( 90, * )
434
435	DO k = nzb, nzt+1
436	READ( 90, * ) zz, luy, luz, tu(k), lvy, lvz, tv(k), lwy, lwz, tw(k), &
437	r11(k), r21(k), r22(k), r31(k), r32(k), r33(k), &
438	d1, d2, d3, d5
439
440	!
441	!-- Convert length scales from meter to number of grid points
442	nuy(k) = INT( luy * ddy )
443	nuz(k) = INT( luz / dz )
444	nvy(k) = INT( lvy * ddy )
445	nvz(k) = INT( lvz / dz )
446	nwy(k) = INT( lwy * ddy )
447	nwz(k) = INT( lwz / dz )
448
449	!
450	!-- Save Mean inflow profiles
451	IF ( TRIM( initializing_actions ) /= 'read_restart_data' ) THEN
452	mean_inflow_profiles(k,1) = d1
453	mean_inflow_profiles(k,2) = d2
454	! mean_inflow_profiles(k,4) = d4
455	mean_inflow_profiles(k,5) = d5
456	ENDIF
457	ENDDO
458
459	CLOSE( 90 )
460
461	!
462	!-- Assign initial profiles
463	u_init = mean_inflow_profiles(:,1)
464	v_init = mean_inflow_profiles(:,2)
465	! pt_init = mean_inflow_profiles(:,4)
466	e_init = MAXVAL( mean_inflow_profiles(:,5) )
467
468	!
469	!-- Calculate coefficient matrix from Reynolds stress tensor (Lund rotation)
470	DO k = nzb, nzt+1
471	IF ( r11(k) > 0.0_wp ) THEN
472	a11(k) = SQRT( r11(k) )
473	a21(k) = r21(k) / a11(k)
474	ELSE
475	a11(k) = 0.0_wp
476	a21(k) = 0.0_wp
477	ENDIF
478
479	a22(k) = r22(k) - a21(k)**2
480	IF ( a22(k) > 0.0_wp ) THEN
481	a22(k) = SQRT( a22(k) )
482	a32(k) = ( r32(k) - a21(k) * a31(k) ) / a22(k)
483	ELSE
484	a22(k) = 0.0_wp
485	a32(k) = 0.0_wp
486	ENDIF
487
488	!
489	!-- a31, a32, a33 must be calculated with interpolated a11, a21, a22 (d11,
490	!-- d21, d22) because of different vertical grid
491	IF ( k .le. nzt ) THEN
492	d11 = 0.5_wp * ( r11(k) + r11(k+1) )
493	IF ( d11 > 0.0_wp ) THEN
494	d11 = SQRT( d11 )
495	d21 = ( 0.5_wp * ( r21(k) + r21(k+1) ) ) / d11
496	a31(k) = r31(k) / d11
497	ELSE
498	d21 = 0.0_wp
499	a31(k) = 0.0_wp
500	ENDIF
501
502	d22 = 0.5_wp * ( r22(k) + r22(k+1) ) - d21 ** 2
503	IF ( d22 > 0.0_wp ) THEN
504	a32(k) = ( r32(k) - d21 * a31(k) ) / SQRT( d22 )
505	ELSE
506	a32(k) = 0.0_wp
507	ENDIF
508
509	a33(k) = r33(k) - a31(k) 2 - a32(k) 2
510	IF ( a33(k) > 0.0_wp ) THEN
511	a33(k) = SQRT( a33(k) )
512	ELSE
513	a33(k) = 0.0_wp
514	ENDIF
515	ELSE
516	a31(k) = a31(k-1)
517	a32(k) = a32(k-1)
518	a33(k) = a33(k-1)
519	ENDIF
520
521	ENDDO
522
523	!
524	!-- Define the size of the filter functions and allocate them.
525	merg = 0
526
527	! arrays must be large enough to cover the largest length scale
528	DO k = nzb, nzt+1
529	j = MAX( ABS(nuy(k)), ABS(nuz(k)), &
530	ABS(nvy(k)), ABS(nvz(k)), &
531	ABS(nwy(k)), ABS(nwz(k)) )
532	IF ( j > merg ) merg = j
533	ENDDO
534
535	merg = 2 * merg
536	mergp = merg + nbgp
537
538	ALLOCATE ( buy(-merg:merg,nzb:nzt+1), buz(-merg:merg,nzb:nzt+1), &
539	bvy(-merg:merg,nzb:nzt+1), bvz(-merg:merg,nzb:nzt+1), &
540	bwy(-merg:merg,nzb:nzt+1), bwz(-merg:merg,nzb:nzt+1) )
541
542	!
543	!-- Allocate velocity seeds
544	ALLOCATE ( fu( nzb:nzt+1,nysg:nyng), fuo(nzb:nzt+1,nysg:nyng), &
545	fv( nzb:nzt+1,nysg:nyng), fvo(nzb:nzt+1,nysg:nyng), &
546	fw( nzb:nzt+1,nysg:nyng), fwo(nzb:nzt+1,nysg:nyng) )
547
548	fu = 0._wp
549	fuo = 0._wp
550	fv = 0._wp
551	fvo = 0._wp
552	fw = 0._wp
553	fwo = 0._wp
554
555	!
556	!-- Create filter functions
557	CALL stg_filter_func( nuy, buy ) !filter uy
558	CALL stg_filter_func( nuz, buz ) !filter uz
559	CALL stg_filter_func( nvy, bvy ) !filter vy
560	CALL stg_filter_func( nvz, bvz ) !filter vz
561	CALL stg_filter_func( nwy, bwy ) !filter wy
562	CALL stg_filter_func( nwz, bwz ) !filter wz
563
564	#if defined( __parallel )
565	CALL MPI_BARRIER( comm2d, ierr )
566	#endif
567
568	!
569	!-- In case of restart, calculate velocity seeds fu, fv, fw from former
570	! time step.
571	! Bug: fu, fv, fw are different in those heights where a11, a22, a33
572	! are 0 compared to the prerun. This is mostly for k=nzt+1.
573	IF ( TRIM( initializing_actions ) == 'read_restart_data' ) THEN
574	IF ( myidx == id_inflow ) THEN
575	DO j = nysg, nyng
576	DO k = nzb, nzt+1
577
578	IF ( a11(k) .NE. 0._wp ) THEN
579	fu(k,j) = ( u(k,j,-1) / mc_factor - &
580	mean_inflow_profiles(k,1) ) / a11(k)
581	ELSE
582	fu(k,j) = 0._wp
583	ENDIF
584
585	IF ( a22(k) .NE. 0._wp ) THEN
586	fv(k,j) = ( v(k,j,-1) / mc_factor - a21(k) * fu(k,j) - &
587	mean_inflow_profiles(k,2) ) / a22(k)
588	ELSE
589	fv(k,j) = 0._wp
590	ENDIF
591
592	IF ( a33(k) .NE. 0._wp ) THEN
593	fw(k,j) = ( w(k,j,-1) / mc_factor - a31(k) * fu(k,j) - &
594	a32(k) * fv(k,j) ) / a33(k)
595	ELSE
596	fw = 0._wp
597	ENDIF
598
599	ENDDO
600	ENDDO
601	ENDIF
602	ENDIF
603
604	CALL cpu_log( log_point(57), 'synthetic_turbulence_gen', 'stop' )
605
606	END SUBROUTINE stg_init
607
608
609	!------------------------------------------------------------------------------!
610	! Description:
611	! ------------
612	!> Calculate filter function bxx from length scale nxx following Eg.9 and 10
613	!> (Xie and Castro, 2008)
614	!------------------------------------------------------------------------------!
615	SUBROUTINE stg_filter_func( nxx, bxx )
616
617
618	IMPLICIT NONE
619
620	INTEGER(iwp) :: k !< loop index
621	INTEGER(iwp) :: n_k !< length scale nXX in height k
622	INTEGER(iwp) :: n_k2 !< n_k * 2
623	INTEGER(iwp) :: nf !< index for length scales
624
625	REAL(wp) :: bdenom !< denominator for filter functions bXX
626	REAL(wp) :: qsi = 1.0_wp !< minimization factor
627
628	INTEGER(iwp), DIMENSION(:) :: nxx(nzb:nzt+1) !< length scale (in gp)
629
630	REAL(wp), DIMENSION(:,:) :: bxx(-merg:merg,nzb:nzt+1) !< filter function
631
632
633	bxx = 0.0_wp
634
635	DO k = nzb, nzt+1
636	bdenom = 0.0_wp
637	n_k = nxx(k)
638	IF ( n_k /= 0 ) THEN
639	n_k2 = n_k * 2
640
641	!
642	!-- ( Eq.10 )^2
643	DO nf = -n_k2, n_k2
644	bdenom = bdenom + EXP( -qsi * pi * ABS(nf) / n_k )**2
645	ENDDO
646
647	!
648	!-- ( Eq.9 )
649	bdenom = SQRT( bdenom )
650	DO nf = -n_k2, n_k2
651	bxx(nf,k) = EXP( -qsi * pi * ABS(nf) / n_k ) / bdenom
652	ENDDO
653	ENDIF
654	ENDDO
655
656	END SUBROUTINE stg_filter_func
657
658
659	!------------------------------------------------------------------------------!
660	! Description:
661	! ------------
662	!> Parin for &stg_par for synthetic turbulence generator
663	!------------------------------------------------------------------------------!
664	SUBROUTINE stg_parin
665
666
667	IMPLICIT NONE
668
669	CHARACTER (LEN=80) :: line !< dummy string that contains the current line of the parameter file
670
671
672	NAMELIST /stg_par/ use_syn_turb_gen
673
674	line = ' '
675
676	!
677	!-- Try to find stg package
678	REWIND ( 11 )
679	line = ' '
680	DO WHILE ( INDEX( line, '&stg_par' ) == 0 )
681	READ ( 11, '(A)', END=10 ) line
682	ENDDO
683	BACKSPACE ( 11 )
684
685	!
686	!-- Read namelist
687	READ ( 11, stg_par )
688
689	!
690	!-- Set flag that indicates that the synthetic turbulence generator is switched
691	!-- on
692	syn_turb_gen = .TRUE.
693
694	IF ( TRIM( initializing_actions ) == 'read_restart_data' ) THEN
695	CALL stg_read_restart_data
696	ENDIF
697
698	10 CONTINUE
699
700	END SUBROUTINE stg_parin
701
702
703	!------------------------------------------------------------------------------!
704	! Description:
705	! ------------
706	!> Skipping the stg variables from restart-file (binary format).
707	!------------------------------------------------------------------------------!
708	SUBROUTINE stg_skip_var_list
709
710	IMPLICIT NONE
711
712	CHARACTER (LEN=1) :: cdum
713	CHARACTER (LEN=30) :: variable_chr
714
715	READ ( 13 ) variable_chr
716
717	DO WHILE ( TRIM( variable_chr ) /= '* end stg module *' )
718
719	READ ( 13 ) cdum
720	READ ( 13 ) variable_chr
721
722	ENDDO
723
724	END SUBROUTINE stg_skip_var_list
725
726
727	!------------------------------------------------------------------------------!
728	! Description:
729	! ------------
730	!> This routine reads the respective restart data.
731	!------------------------------------------------------------------------------!
732	SUBROUTINE stg_read_restart_data
733
734
735	IMPLICIT NONE
736
737	CHARACTER (LEN=30) :: variable_chr !< dummy variable to read string
738
739
740	READ ( 13 ) variable_chr
741	DO WHILE ( TRIM( variable_chr ) /= '* end stg module *' )
742
743	SELECT CASE ( TRIM( variable_chr ) )
744
745	CASE ( 'use_syn_turb_gen' )
746	READ ( 13 ) use_syn_turb_gen
747	CASE ( 'mc_factor' )
748	READ ( 13 ) mc_factor
749	CASE ( 'syn_turb_gen_prerun' )
750	READ ( 13 ) syn_turb_gen_prerun
751
752	END SELECT
753
754	READ ( 13 ) variable_chr
755
756	ENDDO
757
758	END SUBROUTINE stg_read_restart_data
759
760
761	!------------------------------------------------------------------------------!
762	! Description:
763	! ------------
764	!> This routine writes the respective restart data.
765	!------------------------------------------------------------------------------!
766	SUBROUTINE stg_write_restart_data
767
768
769	IMPLICIT NONE
770
771	syn_turb_gen_prerun = .TRUE.
772
773	WRITE ( 14 ) 'use_syn_turb_gen '
774	WRITE ( 14 ) use_syn_turb_gen
775	WRITE ( 14 ) 'mc_factor '
776	WRITE ( 14 ) mc_factor
777	WRITE ( 14 ) 'syn_turb_gen_prerun '
778	WRITE ( 14 ) syn_turb_gen_prerun
779
780	WRITE ( 14 ) '* end stg module * '
781
782	END SUBROUTINE stg_write_restart_data
783
784
785	!------------------------------------------------------------------------------!
786	! Description:
787	! ------------
788	!> Create turbulent inflow fields for u, v, w with prescribed length scales and
789	!> Reynolds stress tensor after a method of Xie and Castro (2008), modified
790	!> following suggestions of Kim et al. (2013), and using a Lund rotation
791	!> (Lund, 1998).
792	!------------------------------------------------------------------------------!
793	SUBROUTINE stg_main
794
795
796	USE arrays_3d, &
797	ONLY: dzw
798
799	USE control_parameters, &
800	ONLY: dt_3d, intermediate_timestep_count, simulated_time, &
801	volume_flow_initial
802
803	USE indices, &
804	ONLY: nyn, nys
805
806	USE statistics, &
807	ONLY: weight_substep
808
809
810	IMPLICIT NONE
811
812	INTEGER(iwp) :: j !< loop index in y-direction
813	INTEGER(iwp) :: k !< loop index in z-direction
814
815	REAL(wp) :: dt_stg !< wheighted subtimestep
816	REAL(wp) :: mc_factor_l !< local mass flux correction factor
817
818	REAL(wp), DIMENSION(nzb:nzt+1,nysg:nyng,5,nbgp) :: inflow_dist !< disturbance for inflow profiles
819
820
821	CALL cpu_log( log_point(57), 'synthetic_turbulence_gen', 'start' )
822
823	!
824	!-- Calculate time step which is needed for filter functions
825	dt_stg = dt_3d * weight_substep(intermediate_timestep_count)
826
827	!
828	!-- Initial value of fu, fv, fw
829	IF ( simulated_time == 0.0_wp .AND. .NOT. velocity_seed_initialized ) THEN
830	CALL stg_generate_seed_yz( nuy, nuz, buy, buz, fu )
831	CALL stg_generate_seed_yz( nvy, nvz, bvy, bvz, fv )
832	CALL stg_generate_seed_yz( nwy, nwz, bwy, bwz, fw )
833	velocity_seed_initialized = .TRUE.
834	ENDIF
835	!
836	!-- New set of fu, fv, fw
837	CALL stg_generate_seed_yz( nuy, nuz, buy, buz, fuo )
838	CALL stg_generate_seed_yz( nvy, nvz, bvy, bvz, fvo )
839	CALL stg_generate_seed_yz( nwy, nwz, bwy, bwz, fwo )
840
841	IF ( myidx == id_inflow ) THEN
842
843	DO j = nysg, nyng
844	DO k = nzb, nzt + 1
845	!
846	!-- Update fu, fv, fw following Eq. 14 of Xie and Castro (2008)
847	IF ( tu(k) == 0.0_wp ) THEN
848	fu(k,j) = fuo(k,j)
849	ELSE
850	fu(k,j) = fu(k,j) * EXP( -pi * dt_stg * 0.5_wp / tu(k) ) + &
851	fuo(k,j) * SQRT( 1.0_wp - EXP( -pi * dt_stg / tu(k) ) )
852	ENDIF
853
854	IF ( tv(k) == 0.0_wp ) THEN
855	fv(k,j) = fvo(k,j)
856	ELSE
857	fv(k,j) = fv(k,j) * EXP( -pi * dt_stg * 0.5_wp / tv(k) ) + &
858	fvo(k,j) * SQRT( 1.0_wp - EXP( -pi * dt_stg / tv(k) ) )
859	ENDIF
860
861	IF ( tw(k) == 0.0_wp ) THEN
862	fw(k,j) = fwo(k,j)
863	ELSE
864	fw(k,j) = fw(k,j) * EXP( -pi * dt_stg * 0.5_wp / tw(k) ) + &
865	fwo(k,j) * SQRT( 1.0_wp - EXP( -pi * dt_stg / tw(k) ) )
866	ENDIF
867	!
868	!-- Lund rotation following Eq. 17 in Xie and Castro (2008).
869	!-- Additional factors are added to improve the variance of v and w
870	IF( k == 0 ) THEN
871	inflow_dist(k,j,1,1) = 0.0_wp
872	inflow_dist(k,j,2,1) = 0.0_wp
873	inflow_dist(k,j,3,1) = 0.0_wp
874	inflow_dist(k,j,4,1) = 0.0_wp
875	inflow_dist(k,j,5,1) = 0.0_wp
876	ELSE
877	inflow_dist(k,j,1,1) = a11(k) * fu(k,j)
878	!experimental test of 1.2
879	inflow_dist(k,j,2,1) = ( SQRT( a22(k) / MAXVAL(a22) ) &
880	* 1.2_wp ) &
881	* ( a21(k) * fu(k,j) &
882	+ a22(k) * fv(k,j) )
883	inflow_dist(k,j,3,1) = ( SQRT(a33(k) / MAXVAL(a33) ) &
884	* 1.3_wp ) &
885	* ( a31(k) * fu(k,j) &
886	+ a32(k) * fv(k,j) &
887	+ a33(k) * fw(k,j) )
888	! Calculation for pt and e not yet implemented
889	inflow_dist(k,j,4,1) = 0.0_wp
890	inflow_dist(k,j,5,1) = 0.0_wp
891	ENDIF
892
893	ENDDO
894	ENDDO
895
896	!
897	!-- Mass flux correction following Kim et al. (2013)
898	!-- This correction factor insures that the mass flux is preserved at the
899	!-- inflow boundary
900	mc_factor_l = 0.0_wp
901	mc_factor = 0.0_wp
902	DO j = nys, nyn
903	DO k = nzb+1, nzt
904	mc_factor_l = mc_factor_l + dzw(k) * &
905	( mean_inflow_profiles(k,1) + inflow_dist(k,j,1,1) )
906	ENDDO
907	ENDDO
908
909	#if defined( __parallel )
910	CALL MPI_ALLREDUCE( mc_factor_l, mc_factor, &
911	1, MPI_REAL, MPI_SUM, comm1dy, ierr )
912	#else
913	mc_factor = mc_factor_l
914	#endif
915
916	mc_factor = volume_flow_initial(1) / mc_factor
917
918	!
919	!-- Add disturbance at the inflow
920	DO j = nysg, nyng
921	DO k = nzb, nzt+1
922	u(k,j,-nbgp+1:0) = ( mean_inflow_profiles(k,1) + &
923	inflow_dist(k,j,1,1) ) * mc_factor
924	v(k,j,-nbgp:-1) = ( mean_inflow_profiles(k,2) + &
925	inflow_dist(k,j,2,1) ) * mc_factor
926	w(k,j,-nbgp:-1) = inflow_dist(k,j,3,1) * mc_factor
927	ENDDO
928	ENDDO
929
930	ENDIF
931
932	CALL cpu_log( log_point(57), 'synthetic_turbulence_gen', 'stop' )
933
934	END SUBROUTINE stg_main
935
936
937	!------------------------------------------------------------------------------!
938	! Description:
939	! ------------
940	!> Generate a set of random number rand_it wich is equal on each PE
941	!> and calculate the velocity seed f_n.
942	!> f_n is splitted in vertical direction by the number of PEs in x-direction and
943	!> and each PE calculates a vertical subsection of f_n. At the the end, all
944	!> parts are collected to form the full array.
945	!------------------------------------------------------------------------------!
946	SUBROUTINE stg_generate_seed_yz( n_y, n_z, b_y, b_z, f_n )
947
948
949	USE indices, &
950	ONLY: ny
951
952
953	IMPLICIT NONE
954
955	INTEGER(iwp) :: j !< loop index in y-direction
956	INTEGER(iwp) :: jj !< loop index in y-direction
957	INTEGER(iwp) :: k !< loop index in z-direction
958	INTEGER(iwp) :: kk !< loop index in z-direction
959	INTEGER(iwp) :: send_count !< send count for MPI_GATHERV
960
961	INTEGER(iwp), DIMENSION(nzb:nzt+1) :: n_y !< length scale in y-direction
962	INTEGER(iwp), DIMENSION(nzb:nzt+1) :: n_z !< length scale in z-direction
963	INTEGER(iwp), DIMENSION(nzb:nzt+1) :: n_y2 !< n_y*2
964	INTEGER(iwp), DIMENSION(nzb:nzt+1) :: n_z2 !< n_z*2
965
966	REAL(wp) :: nyz_inv !< inverse of number of grid points in yz-slice
967	REAL(wp) :: rand_av !< average of random number
968	REAL(wp) :: rand_sigma_inv !< inverse of stdev of random number
969
970	REAL(wp), DIMENSION(-merg:merg,nzb:nzt+1) :: b_y !< filter func in y-dir
971	REAL(wp), DIMENSION(-merg:merg,nzb:nzt+1) :: b_z !< filter func in z-dir
972	REAL(wp), DIMENSION(nzb_x:nzt_x+1,nysg:nyng) :: f_n_l !< local velocity seed
973	REAL(wp), DIMENSION(nzb:nzt+1,nysg:nyng) :: f_n !< velocity seed
974	REAL(wp), DIMENSION(:,:), ALLOCATABLE :: rand_it !< random number
975
976
977	!
978	!-- Generate random numbers using a seed generated in stg_init.
979	!-- The set of random numbers are modified to have an average of 0 and
980	!-- unit variance.
981	ALLOCATE( rand_it(nzb-mergp:nzt+1+mergp,-mergp:ny+mergp) )
982
983	rand_av = 0.0_wp
984	rand_sigma_inv = 0.0_wp
985	nyz_inv = 1.0_wp / REAL( ( nzt+1 - nzb+1 ) * ( ny+1 ), KIND=wp )
986
987	DO j = 0, ny
988	DO k = nzb, nzt+1
989	CALL RANDOM_NUMBER( rand_it(k,j) )
990	rand_av = rand_av + rand_it(k,j)
991	ENDDO
992	ENDDO
993
994	rand_av = rand_av * nyz_inv
995
996	DO j = 0, ny
997	DO k = nzb, nzt+1
998	rand_it(k,j) = rand_it(k,j) - rand_av
999	rand_sigma_inv = rand_sigma_inv + rand_it(k,j) ** 2
1000	ENDDO
1001	ENDDO
1002
1003	rand_sigma_inv = 1.0_wp / SQRT(rand_sigma_inv * nyz_inv)
1004
1005	DO j = 0, ny
1006	DO k = nzb, nzt+1
1007	rand_it(k,j) = rand_it(k,j) * rand_sigma_inv
1008	ENDDO
1009	ENDDO
1010
1011	!
1012	!-- Periodic fill of random number in space
1013	DO j = 0, ny
1014	DO k = 1, mergp
1015	rand_it(nzb -k,j) = rand_it(nzt+2-k,j) ! bottom margin
1016	rand_it(nzt+1+k,j) = rand_it(nzb+k-1,j) ! top margin
1017	ENDDO
1018	ENDDO
1019	DO j = 1, mergp
1020	DO k = nzb-mergp, nzt+1+mergp
1021	rand_it(k, -j) = rand_it(k,ny-j+1) ! south margin
1022	rand_it(k,ny+j) = rand_it(k, j-1) ! north margin
1023	ENDDO
1024	ENDDO
1025
1026	!
1027	!-- Generate velocity seed following Eq.6 of Xie and Castro (2008)
1028	n_y2 = n_y * 2
1029	n_z2 = n_z * 2
1030	f_n_l = 0.0_wp
1031
1032	DO j = nysg, nyng
1033	DO k = nzb_x, nzt_x+1
1034	DO jj = -n_y2(k), n_y2(k)
1035	DO kk = -n_z2(k), n_z2(k)
1036	f_n_l(k,j) = f_n_l(k,j) &
1037	+ b_y(jj,k) * b_z(kk,k) * rand_it(k+kk,j+jj)
1038	ENDDO
1039	ENDDO
1040	ENDDO
1041	ENDDO
1042
1043	DEALLOCATE( rand_it )
1044
1045	!
1046	!-- Gather velocity seeds of full subdomain
1047	send_count = nzt_x - nzb_x + 1
1048	IF ( nzt_x == nzt ) send_count = send_count + 1
1049
1050	#if defined( __parallel )
1051	CALL MPI_GATHERV( f_n_l(nzb_x,nysg), send_count, stg_type_yz_small, &
1052	f_n(nzb+1,nysg), recv_count, displs, stg_type_yz, &
1053	id_inflow, comm1dx, ierr )
1054	#else
1055	f_n(nzb+1:nzt+1,nysg:nyng) = f_n_l(nzb_x:nzt_x+1,nysg:nyng)
1056	#endif
1057
1058
1059	END SUBROUTINE stg_generate_seed_yz
1060
1061	END MODULE synthetic_turbulence_generator_mod

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