source: palm/trunk/SOURCE/init_pt_anomaly.f90 @ 1354

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1 SUBROUTINE init_pt_anomaly
2
3!--------------------------------------------------------------------------------!
4! This file is part of PALM.
5!
6! PALM is free software: you can redistribute it and/or modify it under the terms
7! of the GNU General Public License as published by the Free Software Foundation,
8! either version 3 of the License, or (at your option) any later 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 1997-2014 Leibniz Universitaet Hannover
18!--------------------------------------------------------------------------------!
19!
20! Current revisions:
21! -----------------
22!
23!
24! Former revisions:
25! -----------------
26! $Id: init_pt_anomaly.f90 1354 2014-04-08 15:22:57Z heinze $
27!
28! 1353 2014-04-08 15:21:23Z heinze
29! REAL constants provided with KIND-attribute
30!
31! 1322 2014-03-20 16:38:49Z raasch
32! REAL constants defined as wp_kind
33!
34! 1320 2014-03-20 08:40:49Z raasch
35! ONLY-attribute added to USE-statements,
36! kind-parameters added to all INTEGER and REAL declaration statements,
37! kinds are defined in new module kinds,
38! revision history before 2012 removed,
39! comment fields (!:) to be used for variable explanations added to
40! all variable declaration statements
41!
42! 1036 2012-10-22 13:43:42Z raasch
43! code put under GPL (PALM 3.9)
44!
45! 861 2012-03-26 14:18:34Z suehring
46! Modification of the amplitude to obtain a visible temperature perturbation.
47!
48! Revision 1.1  1997/08/29 08:58:56  raasch
49! Initial revision
50!
51!
52! Description:
53! ------------
54! Impose a temperature perturbation for an advection test.
55!------------------------------------------------------------------------------!
56
57    USE arrays_3d,                                                             &
58        ONLY:  pt, zu
59
60    USE grid_variables,                                                        &
61        ONLY:  dx, dy
62
63    USE indices,                                                               &
64        ONLY:  nbgp, nx, nxl, nxr, nyn, nys, nzb, nzt
65       
66    USE kinds
67
68    IMPLICIT NONE
69
70    INTEGER(iwp) ::  i  !:
71    INTEGER(iwp) ::  ic !:
72    INTEGER(iwp) ::  j  !:
73    INTEGER(iwp) ::  jc !:
74    INTEGER(iwp) ::  k  !:
75    INTEGER(iwp) ::  kc !:
76   
77    REAL(wp)     ::  betrag !:
78    REAL(wp)     ::  radius !:
79    REAL(wp)     ::  rc     !:
80    REAL(wp)     ::  x      !:
81    REAL(wp)     ::  y      !:
82    REAL(wp)     ::  z      !:
83   
84!
85!-- Defaults: radius rc, strength z,
86!--           position of centre: ic, jc, kc
87    rc =  10.0_wp * dx
88    ic =  ( nx+1 ) / 2
89    jc =  ic
90    kc =  nzt / 2
91
92!
93!-- Compute the perturbation.
94    DO  i = nxl, nxr
95       DO  j = nys, nyn
96          DO  k = nzb+1, nzt
97             x = ( i - ic ) * dx
98             y = ( j - jc ) * dy
99             z = ABS( zu(k) - zu(kc) )
100             radius = SQRT( x**2 + y**2 + z**2 )
101             IF ( radius <= rc )  THEN
102                betrag = 5.0_wp * EXP( -( radius * 0.001_wp / 2.0_wp )**2 )
103             ELSE
104                betrag = 0.0_wp
105             ENDIF
106
107             pt(k,j,i) = pt(k,j,i) + betrag
108
109          ENDDO
110       ENDDO
111    ENDDO
112
113!
114!-- Exchange of boundary values for temperature
115    CALL exchange_horiz( pt, nbgp )
116
117
118 END SUBROUTINE init_pt_anomaly
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