source: palm/trunk/SOURCE/disturb_heatflux.f90 @ 2101

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1!> @file disturb_heatflux.f90
2!------------------------------------------------------------------------------!
3! This file is part of PALM.
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 1997-2017 Leibniz Universitaet Hannover
18!------------------------------------------------------------------------------!
19!
20! Current revisions:
21! ------------------
22!
23!
24! Former revisions:
25! -----------------
26! $Id: disturb_heatflux.f90 2101 2017-01-05 16:42:31Z suehring $
27!
28! 2037 2016-10-26 11:15:40Z knoop
29! Anelastic approximation implemented
30!
31! 2000 2016-08-20 18:09:15Z knoop
32! Forced header and separation lines into 80 columns
33!
34! 1682 2015-10-07 23:56:08Z knoop
35! Code annotations made doxygen readable
36!
37! 1353 2014-04-08 15:21:23Z heinze
38! REAL constants provided with KIND-attribute
39!
40! 1322 2014-03-20 16:38:49Z raasch
41! REAL constants defined as wp-kind
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! 1036 2012-10-22 13:43:42Z raasch
52! code put under GPL (PALM 3.9)
53!
54! Revision 1.1  1998/03/25 20:03:47  raasch
55! Initial revision
56!
57!
58! Description:
59! ------------
60!> Generate random, normally distributed heatflux values and store them as the
61!> near-surface heatflux.
62!> On parallel computers, too, this random generator is called at all grid points
63!> of the total array in order to guarantee the same random distribution of the
64!> total array regardless of the number of processors used during the model run.
65!------------------------------------------------------------------------------!
66 SUBROUTINE disturb_heatflux
67 
68
69    USE arrays_3d,                                                             &
70        ONLY:  shf, heatflux_input_conversion
71       
72    USE control_parameters,                                                    &
73        ONLY:  iran, surface_heatflux, wall_heatflux
74       
75    USE cpulog,                                                                &
76        ONLY:  cpu_log, log_point
77       
78    USE kinds
79   
80    USE indices,                                                               &
81        ONLY:  nx, nxl, nxr, ny, nyn, nys, nzb, nzb_s_inner
82
83    IMPLICIT NONE
84
85    INTEGER(iwp) ::  j  !<
86    INTEGER(iwp) ::  i  !<
87   
88    REAL(wp) ::  random_gauss  !<
89    REAL(wp) ::  randomnumber  !<
90
91
92    CALL cpu_log( log_point(23), 'disturb_heatflux', 'start' )
93
94!
95!-- Generate random disturbances and store them
96    DO  i = 0, nx
97       DO  j = 0, ny
98          randomnumber = random_gauss( iran, 5.0_wp )
99          IF ( nxl <= i  .AND.  nxr >= i  .AND.  nys <= j  .AND.  nyn >= j )   &
100          THEN
101             IF ( nzb_s_inner(j,i) == 0 )  THEN
102                shf(j,i) = randomnumber * surface_heatflux                     &
103                           * heatflux_input_conversion(nzb)
104             ELSE
105!
106!--             Over topography surface_heatflux is replaced by wall_heatflux(0)
107                shf(j,i) = randomnumber * wall_heatflux(0)                     &
108                           * heatflux_input_conversion(nzb_s_inner(j,i))
109             ENDIF
110          ENDIF
111       ENDDO
112    ENDDO
113
114!
115!-- Exchange lateral boundary conditions for the heatflux array
116    CALL exchange_horiz_2d( shf )
117
118    CALL cpu_log( log_point(23), 'disturb_heatflux', 'stop' )
119
120
121 END SUBROUTINE disturb_heatflux
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