source: palm/trunk/SOURCE/disturb_heatflux.f90 @ 1834

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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 terms
6! of the GNU General Public License as published by the Free Software Foundation,
7! either version 3 of the License, or (at your option) any later version.
8!
9! PALM is distributed in the hope that it will be useful, but WITHOUT ANY
10! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
11! A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
12!
13! You should have received a copy of the GNU General Public License along with
14! PALM. If not, see <http://www.gnu.org/licenses/>.
15!
16! Copyright 1997-2016 Leibniz Universitaet Hannover
17!------------------------------------------------------------------------------!
18!
19! Current revisions:
20! ------------------
21!
22!
23! Former revisions:
24! -----------------
25! $Id: disturb_heatflux.f90 1818 2016-04-06 15:53:27Z raasch $
26!
27! 1682 2015-10-07 23:56:08Z knoop
28! Code annotations made doxygen readable
29!
30! 1353 2014-04-08 15:21:23Z heinze
31! REAL constants provided with KIND-attribute
32!
33! 1322 2014-03-20 16:38:49Z raasch
34! REAL constants defined as wp-kind
35!
36! 1320 2014-03-20 08:40:49Z raasch
37! ONLY-attribute added to USE-statements,
38! kind-parameters added to all INTEGER and REAL declaration statements,
39! kinds are defined in new module kinds,
40! revision history before 2012 removed,
41! comment fields (!:) to be used for variable explanations added to
42! all variable declaration statements
43!
44! 1036 2012-10-22 13:43:42Z raasch
45! code put under GPL (PALM 3.9)
46!
47! Revision 1.1  1998/03/25 20:03:47  raasch
48! Initial revision
49!
50!
51! Description:
52! ------------
53!> Generate random, normally distributed heatflux values and store them as the
54!> near-surface heatflux.
55!> On parallel computers, too, this random generator is called at all grid points
56!> of the total array in order to guarantee the same random distribution of the
57!> total array regardless of the number of processors used during the model run.
58!------------------------------------------------------------------------------!
59 SUBROUTINE disturb_heatflux
60 
61
62    USE arrays_3d,                                                             &
63        ONLY:  shf
64       
65    USE control_parameters,                                                    &
66        ONLY:  iran, surface_heatflux, wall_heatflux
67       
68    USE cpulog,                                                                &
69        ONLY:  cpu_log, log_point
70       
71    USE kinds
72   
73    USE indices,                                                               &
74        ONLY:  nx, nxl, nxr, ny, nyn, nys, nzb_s_inner
75
76    IMPLICIT NONE
77
78    INTEGER(iwp) ::  j  !<
79    INTEGER(iwp) ::  i  !<
80   
81    REAL(wp) ::  random_gauss  !<
82    REAL(wp) ::  randomnumber  !<
83
84
85    CALL cpu_log( log_point(23), 'disturb_heatflux', 'start' )
86
87!
88!-- Generate random disturbances and store them
89    DO  i = 0, nx
90       DO  j = 0, ny
91          randomnumber = random_gauss( iran, 5.0_wp )
92          IF ( nxl <= i  .AND.  nxr >= i  .AND.  nys <= j  .AND.  nyn >= j )   &
93          THEN
94             IF ( nzb_s_inner(j,i) == 0 )  THEN
95                shf(j,i) = randomnumber * surface_heatflux
96             ELSE
97!
98!--             Over topography surface_heatflux is replaced by wall_heatflux(0)
99                shf(j,i) = randomnumber * wall_heatflux(0)
100             ENDIF
101          ENDIF
102       ENDDO
103    ENDDO
104
105!
106!-- Exchange lateral boundary conditions for the heatflux array
107    CALL exchange_horiz_2d( shf )
108
109    CALL cpu_log( log_point(23), 'disturb_heatflux', 'stop' )
110
111
112 END SUBROUTINE disturb_heatflux
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