source: palm/trunk/SOURCE/init_pt_anomaly.f90 @ 4598

Last change on this file since 4598 was 4457, checked in by raasch, 13 months ago

ghost point exchange modularized, bugfix for wrong 2d-exchange

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1!> @file init_pt_anomaly.f90
2!------------------------------------------------------------------------------!
3! This file is part of the PALM model system.
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 1997-2020 Leibniz Universitaet Hannover
18!------------------------------------------------------------------------------!
19!
20! Current revisions:
21! -----------------
22!
23!
24! Former revisions:
25! -----------------
26! $Id: init_pt_anomaly.f90 4457 2020-03-11 14:20:43Z suehring $
27! use statement for exchange horiz added
28!
29! 4360 2020-01-07 11:25:50Z suehring
30! Introduction of wall_flags_total_0, which currently sets bits based on static
31! topography information used in wall_flags_static_0
32!
33! 4329 2019-12-10 15:46:36Z motisi
34! Renamed wall_flags_0 to wall_flags_static_0
35!
36! 4182 2019-08-22 15:20:23Z scharf
37! Corrected "Former revisions" section
38!
39! 3655 2019-01-07 16:51:22Z knoop
40! Added topography flags
41!
42! Revision 1.1  1997/08/29 08:58:56  raasch
43! Initial revision
44!
45!
46! Description:
47! ------------
48!> Impose a temperature perturbation for an advection test.
49!------------------------------------------------------------------------------!
50 SUBROUTINE init_pt_anomaly
51
52
53    USE arrays_3d,                                                             &
54        ONLY:  pt, zu
55
56    USE control_parameters
57
58    USE exchange_horiz_mod,                                                    &
59        ONLY:  exchange_horiz
60
61    USE grid_variables,                                                        &
62        ONLY:  dx, dy
63
64    USE indices,                                                               &
65        ONLY:  nbgp, nx, nxl, nxr, ny, nyn, nys, nzb, nzt, wall_flags_total_0
66
67    USE kinds
68
69    IMPLICIT NONE
70
71    INTEGER(iwp) ::  i  !< grid index along x
72    INTEGER(iwp) ::  ic !< center index along x
73    INTEGER(iwp) ::  j  !< grid index along y
74    INTEGER(iwp) ::  jc !< center index along y
75    INTEGER(iwp) ::  k  !< grid index along z
76    INTEGER(iwp) ::  kc !< center index along z
77
78    REAL(wp)     ::  amount                               !< amount of temperature perturbation
79    REAL(wp)     ::  bubble_center_y                      !< center of bubble in y
80    REAL(wp)     ::  bubble_center_z = 170.0              !< center of bubble in z
81    REAL(wp)     ::  bubble_sigma_y = 300.0               !< width of bubble in y
82    REAL(wp)     ::  bubble_sigma_z = 150.0               !< width of bubble in z
83    REAL(wp)     ::  flag                                 !< flag to mask topography grid points
84    REAL(wp)     ::  initial_temperature_difference = 0.4 !< temperature perturbation for bubble in K
85    REAL(wp)     ::  radius                               !< radius of pt anomaly
86    REAL(wp)     ::  rc                                   !< radius of pt anomaly
87    REAL(wp)     ::  x                                    !< x dimension of pt anomaly
88    REAL(wp)     ::  y                                    !< y dimension of pt anomaly
89    REAL(wp)     ::  z                                    !< z dimension of pt anomaly
90
91
92!
93!-- Defaults: radius rc, strength z,
94!--           position of center: ic, jc, kc
95    rc =  10.0_wp * dx
96    ic =  ( nx+1 ) / 2
97    jc =  ic
98    kc =  nzt / 2
99
100    IF ( INDEX( initializing_actions, 'initialize_ptanom' ) /= 0 )  THEN
101!
102!--    Compute the perturbation.
103       DO  i = nxl, nxr
104          DO  j = nys, nyn
105             DO  k = nzb+1, nzt
106!
107!--             Predetermine flag to mask topography
108                flag = MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(k,j,i), 0 ) )
109
110                x = ( i - ic ) * dx
111                y = ( j - jc ) * dy
112                z = ABS( zu(k) - zu(kc) )
113                radius = SQRT( x**2 + y**2 + z**2 )
114                IF ( radius <= rc )  THEN
115                   amount = 5.0_wp * EXP( -( radius * 0.001_wp / 2.0_wp )**2 )
116                ELSE
117                   amount = 0.0_wp
118                ENDIF
119
120                pt(k,j,i) = pt(k,j,i) + amount * flag
121
122             ENDDO
123          ENDDO
124       ENDDO
125
126!
127!-- Initialize warm air bubble close to surface and homogenous elegonated
128!-- along x-Axis
129    ELSEIF ( INDEX( initializing_actions, 'initialize_bubble' ) /= 0 )  THEN
130!
131!--    Calculate y-center of model domain
132       bubble_center_y = ( ny + 1.0 ) * dy / 2.0
133
134!
135!--    Compute perturbation for potential temperaure
136       DO  i = nxl, nxr
137          DO  j = nys, nyn
138             DO  k = nzb+1, nzt
139!
140!--             Predetermine flag to mask topography
141                flag = MERGE( 1.0_wp, 0.0_wp, BTEST( wall_flags_total_0(k,j,i), 0 ) )
142
143                pt(k,j,i) = pt(k,j,i) +                                        &
144                               EXP( -0.5 * ( (j* dy  - bubble_center_y) /      &
145                                                       bubble_sigma_y )**2) *  &
146                               EXP( -0.5 * ( (zu(k)  - bubble_center_z) /      &
147                                                       bubble_sigma_z)**2) *   &
148                               initial_temperature_difference * flag
149             ENDDO
150          ENDDO
151       ENDDO
152    ENDIF
153
154!
155!-- Exchange of boundary values for temperature
156    CALL exchange_horiz( pt, nbgp )
157
158
159 END SUBROUTINE init_pt_anomaly
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