source: palm/trunk/SOURCE/lpm_extend_tails.f90 @ 1320

Last change on this file since 1320 was 1320, checked in by raasch, 7 years ago

ONLY-attribute added to USE-statements,
kind-parameters added to all INTEGER and REAL declaration statements,
kinds are defined in new module kinds,
old module precision_kind is removed,
revision history before 2012 removed,
comment fields (!:) to be used for variable explanations added to all variable declaration statements

  • Property svn:keywords set to Id
File size: 4.5 KB
Line 
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! ONLY-attribute added to USE-statements,
23! kind-parameters added to all INTEGER and REAL declaration statements,
24! kinds are defined in new module kinds,
25! comment fields (!:) to be used for variable explanations added to
26! all variable declaration statements
27!
28! Former revisions:
29! -----------------
30! $Id: lpm_extend_tails.f90 1320 2014-03-20 08:40:49Z raasch $
31!
32! 1036 2012-10-22 13:43:42Z raasch
33! code put under GPL (PALM 3.9)
34!
35! 849 2012-03-15 10:35:09Z raasch
36! initial revision (former part of advec_particles)
37!
38!
39! Description:
40! ------------
41! Add the current particle positions to the particle tails.
42!------------------------------------------------------------------------------!
43
44    USE control_parameters,                                                    &
45        ONLY:  dt_3d
46
47    USE kinds
48
49    USE particle_attributes,                                                   &
50        ONLY:  maximum_number_of_tailpoints, maximum_tailpoint_age,            &
51               minimum_tailpoint_distance, number_of_particles, particles,     &
52               particle_tail_coordinates
53
54    IMPLICIT NONE
55
56    INTEGER(iwp) ::  i       !:
57    INTEGER(iwp) ::  n       !:
58    INTEGER(iwp) ::  nn      !:
59
60    REAL(wp) ::  distance    !:
61
62
63    distance = 0.0
64
65    DO  n = 1, number_of_particles
66
67       nn = particles(n)%tail_id
68
69       IF ( nn /= 0 )  THEN
70!
71!--       Calculate the distance between the actual particle position and the
72!--       next tailpoint
73          IF ( minimum_tailpoint_distance /= 0.0 )  THEN
74             distance = ( particle_tail_coordinates(1,1,nn) -      &
75                          particle_tail_coordinates(2,1,nn) )**2 + &
76                        ( particle_tail_coordinates(1,2,nn) -      &
77                          particle_tail_coordinates(2,2,nn) )**2 + &
78                        ( particle_tail_coordinates(1,3,nn) -      &
79                          particle_tail_coordinates(2,3,nn) )**2
80          ENDIF
81
82!
83!--       First, increase the index of all existings tailpoints by one
84          IF ( distance >= minimum_tailpoint_distance )  THEN
85
86             DO  i = particles(n)%tailpoints, 1, -1
87                particle_tail_coordinates(i+1,:,nn) = &
88                                               particle_tail_coordinates(i,:,nn)
89             ENDDO
90!
91!--          Increase the counter which contains the number of tailpoints.
92!--          This must always be smaller than the given maximum number of
93!--          tailpoints because otherwise the index bounds of
94!--          particle_tail_coordinates would be exceeded
95             IF ( particles(n)%tailpoints < maximum_number_of_tailpoints-1 ) &
96             THEN
97                particles(n)%tailpoints = particles(n)%tailpoints + 1
98             ENDIF
99          ENDIF
100!
101!--       In any case, store the new point at the beginning of the tail
102          particle_tail_coordinates(1,1,nn) = particles(n)%x
103          particle_tail_coordinates(1,2,nn) = particles(n)%y
104          particle_tail_coordinates(1,3,nn) = particles(n)%z
105          particle_tail_coordinates(1,4,nn) = particles(n)%class
106!
107!--       Increase the age of the tailpoints
108          IF ( minimum_tailpoint_distance /= 0.0 )  THEN
109             particle_tail_coordinates(2:particles(n)%tailpoints,5,nn) =    &
110               particle_tail_coordinates(2:particles(n)%tailpoints,5,nn) + dt_3d
111!
112!--          Delete the last tailpoint, if it has exceeded its maximum age
113             IF ( particle_tail_coordinates(particles(n)%tailpoints,5,nn) > &
114                  maximum_tailpoint_age )  THEN
115                particles(n)%tailpoints = particles(n)%tailpoints - 1
116             ENDIF
117          ENDIF
118
119       ENDIF
120
121    ENDDO
122
123
124 END SUBROUTINE lpm_extend_tails
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