source: palm/trunk/SOURCE/lpm_extend_tails.f90 @ 1360

Last change on this file since 1360 was 1360, checked in by hoffmann, 8 years ago

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1 SUBROUTINE lpm_extend_tails
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: lpm_extend_tails.f90 1360 2014-04-11 17:20:32Z hoffmann $
27!
28! 1359 2014-04-11 17:15:14Z hoffmann
29! New particle structure integrated.
30! Kind definition added to all floating point numbers.
31!
32! 1320 2014-03-20 08:40:49Z raasch
33! ONLY-attribute added to USE-statements,
34! kind-parameters added to all INTEGER and REAL declaration statements,
35! kinds are defined in new module kinds,
36! comment fields (!:) to be used for variable explanations added to
37! all variable declaration statements
38!
39! 1036 2012-10-22 13:43:42Z raasch
40! code put under GPL (PALM 3.9)
41!
42! 849 2012-03-15 10:35:09Z raasch
43! initial revision (former part of advec_particles)
44!
45!
46! Description:
47! ------------
48! Add the current particle positions to the particle tails.
49!------------------------------------------------------------------------------!
50
51    USE control_parameters,                                                    &
52        ONLY:  dt_3d
53
54    USE kinds
55
56    USE particle_attributes,                                                   &
57        ONLY:  maximum_number_of_tailpoints, maximum_tailpoint_age,            &
58               minimum_tailpoint_distance, number_of_particles, particles,     &
59               particle_tail_coordinates
60
61    IMPLICIT NONE
62
63    INTEGER(iwp) ::  i       !:
64    INTEGER(iwp) ::  n       !:
65    INTEGER(iwp) ::  nn      !:
66
67    REAL(wp) ::  distance    !:
68
69
70    distance = 0.0_wp
71
72    DO  n = 1, number_of_particles
73
74       nn = particles(n)%tail_id
75
76       IF ( nn /= 0 )  THEN
77!
78!--       Calculate the distance between the actual particle position and the
79!--       next tailpoint
80          IF ( minimum_tailpoint_distance /= 0.0_wp )  THEN
81             distance = ( particle_tail_coordinates(1,1,nn) -      &
82                          particle_tail_coordinates(2,1,nn) )**2 + &
83                        ( particle_tail_coordinates(1,2,nn) -      &
84                          particle_tail_coordinates(2,2,nn) )**2 + &
85                        ( particle_tail_coordinates(1,3,nn) -      &
86                          particle_tail_coordinates(2,3,nn) )**2
87          ENDIF
88
89!
90!--       First, increase the index of all existings tailpoints by one
91          IF ( distance >= minimum_tailpoint_distance )  THEN
92
93             DO  i = particles(n)%tailpoints, 1, -1
94                particle_tail_coordinates(i+1,:,nn) = &
95                                               particle_tail_coordinates(i,:,nn)
96             ENDDO
97!
98!--          Increase the counter which contains the number of tailpoints.
99!--          This must always be smaller than the given maximum number of
100!--          tailpoints because otherwise the index bounds of
101!--          particle_tail_coordinates would be exceeded
102             IF ( particles(n)%tailpoints < maximum_number_of_tailpoints-1 ) &
103             THEN
104                particles(n)%tailpoints = particles(n)%tailpoints + 1
105             ENDIF
106          ENDIF
107!
108!--       In any case, store the new point at the beginning of the tail
109          particle_tail_coordinates(1,1,nn) = particles(n)%x
110          particle_tail_coordinates(1,2,nn) = particles(n)%y
111          particle_tail_coordinates(1,3,nn) = particles(n)%z
112          particle_tail_coordinates(1,4,nn) = particles(n)%class
113!
114!--       Increase the age of the tailpoints
115          IF ( minimum_tailpoint_distance /= 0.0_wp )  THEN
116             particle_tail_coordinates(2:particles(n)%tailpoints,5,nn) =    &
117               particle_tail_coordinates(2:particles(n)%tailpoints,5,nn) + dt_3d
118!
119!--          Delete the last tailpoint, if it has exceeded its maximum age
120             IF ( particle_tail_coordinates(particles(n)%tailpoints,5,nn) > &
121                  maximum_tailpoint_age )  THEN
122                particles(n)%tailpoints = particles(n)%tailpoints - 1
123             ENDIF
124          ENDIF
125
126       ENDIF
127
128    ENDDO
129
130
131 END SUBROUTINE lpm_extend_tails
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