source: palm/trunk/SOURCE/init_pt_anomaly.f90 @ 1683

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1!> @file init_pt_anomaly.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 1997-2014 Leibniz Universitaet Hannover
17!--------------------------------------------------------------------------------!
18!
19! Current revisions:
20! -----------------
21!
22!
23! Former revisions:
24! -----------------
25! $Id: init_pt_anomaly.f90 1683 2015-10-07 23:57:51Z knoop $
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! 861 2012-03-26 14:18:34Z suehring
48! Modification of the amplitude to obtain a visible temperature perturbation.
49!
50! Revision 1.1  1997/08/29 08:58:56  raasch
51! Initial revision
52!
53!
54! Description:
55! ------------
56!> Impose a temperature perturbation for an advection test.
57!------------------------------------------------------------------------------!
58 SUBROUTINE init_pt_anomaly
59 
60
61    USE arrays_3d,                                                             &
62        ONLY:  pt, zu
63
64    USE grid_variables,                                                        &
65        ONLY:  dx, dy
66
67    USE indices,                                                               &
68        ONLY:  nbgp, nx, nxl, nxr, nyn, nys, nzb, nzt
69       
70    USE kinds
71
72    IMPLICIT NONE
73
74    INTEGER(iwp) ::  i  !<
75    INTEGER(iwp) ::  ic !<
76    INTEGER(iwp) ::  j  !<
77    INTEGER(iwp) ::  jc !<
78    INTEGER(iwp) ::  k  !<
79    INTEGER(iwp) ::  kc !<
80   
81    REAL(wp)     ::  betrag !<
82    REAL(wp)     ::  radius !<
83    REAL(wp)     ::  rc     !<
84    REAL(wp)     ::  x      !<
85    REAL(wp)     ::  y      !<
86    REAL(wp)     ::  z      !<
87   
88!
89!-- Defaults: radius rc, strength z,
90!--           position of centre: ic, jc, kc
91    rc =  10.0_wp * dx
92    ic =  ( nx+1 ) / 2
93    jc =  ic
94    kc =  nzt / 2
95
96!
97!-- Compute the perturbation.
98    DO  i = nxl, nxr
99       DO  j = nys, nyn
100          DO  k = nzb+1, nzt
101             x = ( i - ic ) * dx
102             y = ( j - jc ) * dy
103             z = ABS( zu(k) - zu(kc) )
104             radius = SQRT( x**2 + y**2 + z**2 )
105             IF ( radius <= rc )  THEN
106                betrag = 5.0_wp * EXP( -( radius * 0.001_wp / 2.0_wp )**2 )
107             ELSE
108                betrag = 0.0_wp
109             ENDIF
110
111             pt(k,j,i) = pt(k,j,i) + betrag
112
113          ENDDO
114       ENDDO
115    ENDDO
116
117!
118!-- Exchange of boundary values for temperature
119    CALL exchange_horiz( pt, nbgp )
120
121
122 END SUBROUTINE init_pt_anomaly
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