source: palm/trunk/SOURCE/disturb_heatflux.f90 @ 2000

Last change on this file since 2000 was 2000, checked in by knoop, 5 years ago

Forced header and separation lines into 80 columns

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