source: palm/trunk/SOURCE/disturb_heatflux.f90 @ 2001

Last change on this file since 2001 was 2001, checked in by knoop, 5 years ago

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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 1997-2016 Leibniz Universitaet Hannover
18!------------------------------------------------------------------------------!
19!
20! Current revisions:
21! ------------------
22!
23!
24! Former revisions:
25! -----------------
26! $Id: disturb_heatflux.f90 2001 2016-08-20 18:41:22Z knoop $
27!
28! 2000 2016-08-20 18:09:15Z knoop
29! Forced header and separation lines into 80 columns
30!
31! 1682 2015-10-07 23:56:08Z knoop
32! Code annotations made doxygen readable
33!
34! 1353 2014-04-08 15:21:23Z heinze
35! REAL constants provided with KIND-attribute
36!
37! 1322 2014-03-20 16:38:49Z raasch
38! REAL constants defined as wp-kind
39!
40! 1320 2014-03-20 08:40:49Z raasch
41! ONLY-attribute added to USE-statements,
42! kind-parameters added to all INTEGER and REAL declaration statements,
43! kinds are defined in new module kinds,
44! revision history before 2012 removed,
45! comment fields (!:) to be used for variable explanations added to
46! all variable declaration statements
47!
48! 1036 2012-10-22 13:43:42Z raasch
49! code put under GPL (PALM 3.9)
50!
51! Revision 1.1  1998/03/25 20:03:47  raasch
52! Initial revision
53!
54!
55! Description:
56! ------------
57!> Generate random, normally distributed heatflux values and store them as the
58!> near-surface heatflux.
59!> On parallel computers, too, this random generator is called at all grid points
60!> of the total array in order to guarantee the same random distribution of the
61!> total array regardless of the number of processors used during the model run.
62!------------------------------------------------------------------------------!
63 SUBROUTINE disturb_heatflux
64 
65
66    USE arrays_3d,                                                             &
67        ONLY:  shf
68       
69    USE control_parameters,                                                    &
70        ONLY:  iran, surface_heatflux, wall_heatflux
71       
72    USE cpulog,                                                                &
73        ONLY:  cpu_log, log_point
74       
75    USE kinds
76   
77    USE indices,                                                               &
78        ONLY:  nx, nxl, nxr, ny, nyn, nys, nzb_s_inner
79
80    IMPLICIT NONE
81
82    INTEGER(iwp) ::  j  !<
83    INTEGER(iwp) ::  i  !<
84   
85    REAL(wp) ::  random_gauss  !<
86    REAL(wp) ::  randomnumber  !<
87
88
89    CALL cpu_log( log_point(23), 'disturb_heatflux', 'start' )
90
91!
92!-- Generate random disturbances and store them
93    DO  i = 0, nx
94       DO  j = 0, ny
95          randomnumber = random_gauss( iran, 5.0_wp )
96          IF ( nxl <= i  .AND.  nxr >= i  .AND.  nys <= j  .AND.  nyn >= j )   &
97          THEN
98             IF ( nzb_s_inner(j,i) == 0 )  THEN
99                shf(j,i) = randomnumber * surface_heatflux
100             ELSE
101!
102!--             Over topography surface_heatflux is replaced by wall_heatflux(0)
103                shf(j,i) = randomnumber * wall_heatflux(0)
104             ENDIF
105          ENDIF
106       ENDDO
107    ENDDO
108
109!
110!-- Exchange lateral boundary conditions for the heatflux array
111    CALL exchange_horiz_2d( shf )
112
113    CALL cpu_log( log_point(23), 'disturb_heatflux', 'stop' )
114
115
116 END SUBROUTINE disturb_heatflux
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