source: palm/trunk/SOURCE/lpm_release_set.f90 @ 850

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1 SUBROUTINE lpm_release_set
2
3!------------------------------------------------------------------------------!
4! Current revisions:
5! ------------------
6!
7!
8! Former revisions:
9! -----------------
10! $Id: lpm_release_set.f90 850 2012-03-15 12:09:25Z raasch $
11!
12! 849 2012-03-15 10:35:09Z raasch
13! initial revision (former part of advec_particles)
14!
15!
16! Description:
17! ------------
18! Release a new set of particles and, if required, particle tails. These
19! particles/tails are added at the end of the existing arrays. Extend the
20! respective particle and tail arrays, if neccessary.
21!------------------------------------------------------------------------------!
22
23    USE control_parameters
24    USE grid_variables
25    USE indices
26    USE particle_attributes
27    USE random_function_mod
28
29    IMPLICIT NONE
30
31    INTEGER ::  ie, is, n, nn
32
33
34!
35!-- Check, if particle storage must be extended
36    IF ( number_of_particles + number_of_initial_particles > &
37         maximum_number_of_particles  )  THEN
38       IF ( netcdf_output  .AND.  netcdf_data_format < 3 )  THEN
39          message_string = 'maximum_number_of_particles needs to be increa' // &
40                           'sed &but this is not allowed with netcdf_data_' // &
41                           'format < 3'
42          CALL message( 'lpm_release_set', 'PA0146', 2, 2, -1, 6, 1 )
43       ELSE
44          CALL lpm_extend_particle_array( number_of_initial_particles )
45       ENDIF
46    ENDIF
47
48!
49!-- Check, if tail storage must be extended
50    IF ( use_particle_tails )  THEN
51       IF ( number_of_tails + number_of_initial_tails > &
52            maximum_number_of_tails  )  THEN
53          IF ( netcdf_output  .AND.  netcdf_data_format < 3 )  THEN
54             message_string = 'maximum_number_of_tails needs to be increas' // &
55                              'ed &but this is not allowed with netcdf_dat' // &
56                              'a_format < 3'
57             CALL message( 'lpm_release_set', 'PA0147', 2, 2, -1, 6, 1 )
58          ELSE
59             CALL lpm_extend_tail_array( number_of_initial_tails )
60          ENDIF
61       ENDIF
62    ENDIF
63
64    IF ( number_of_initial_particles /= 0 )  THEN
65
66       is = number_of_particles + 1
67       ie = number_of_particles + number_of_initial_particles
68       particles(is:ie) = initial_particles(1:number_of_initial_particles)
69!
70!--    Add random fluctuation to particle positions. Particles should
71!--    remain in the subdomain.
72       IF ( random_start_position )  THEN
73
74          DO  n = is, ie
75
76             IF ( psl(particles(n)%group) /= psr(particles(n)%group) )  THEN
77                particles(n)%x = particles(n)%x +                         &
78                                 ( random_function( iran_part ) - 0.5 ) * &
79                                 pdx(particles(n)%group)
80                IF ( particles(n)%<=  ( nxl - 0.5 ) * dx )  THEN
81                   particles(n)%x = ( nxl - 0.4999999999 ) * dx
82                ELSEIF ( particles(n)%>=  ( nxr + 0.5 ) * dx )  THEN
83                   particles(n)%x = ( nxr + 0.4999999999 ) * dx
84                ENDIF
85             ENDIF
86
87             IF ( pss(particles(n)%group) /= psn(particles(n)%group) )  THEN
88                particles(n)%y = particles(n)%y +                         &
89                                 ( random_function( iran_part ) - 0.5 ) * &
90                                 pdy(particles(n)%group)
91                IF ( particles(n)%<=  ( nys - 0.5 ) * dy )  THEN
92                   particles(n)%y = ( nys - 0.4999999999 ) * dy
93                ELSEIF ( particles(n)%>=  ( nyn + 0.5 ) * dy )  THEN
94                   particles(n)%y = ( nyn + 0.4999999999 ) * dy
95                ENDIF
96             ENDIF
97
98             IF ( psb(particles(n)%group) /= pst(particles(n)%group) )  THEN
99                particles(n)%z = particles(n)%z +                         &
100                                 ( random_function( iran_part ) - 0.5 ) * &
101                                 pdz(particles(n)%group)
102             ENDIF
103
104          ENDDO
105
106       ENDIF
107
108!
109!--    Set the beginning of the new particle tails and their age
110       IF ( use_particle_tails )  THEN
111
112          DO  n = is, ie
113!
114!--          New particles which should have a tail, already have got a
115!--          provisional tail id unequal zero (see lpm_init)
116             IF ( particles(n)%tail_id /= 0 )  THEN
117
118                number_of_tails = number_of_tails + 1
119                nn = number_of_tails
120                particles(n)%tail_id = nn   ! set the final tail id
121                particle_tail_coordinates(1,1,nn) = particles(n)%x
122                particle_tail_coordinates(1,2,nn) = particles(n)%y
123                particle_tail_coordinates(1,3,nn) = particles(n)%z
124                particle_tail_coordinates(1,4,nn) = particles(n)%class
125                particles(n)%tailpoints = 1
126
127                IF ( minimum_tailpoint_distance /= 0.0 )  THEN
128                   particle_tail_coordinates(2,1,nn) = particles(n)%x
129                   particle_tail_coordinates(2,2,nn) = particles(n)%y
130                   particle_tail_coordinates(2,3,nn) = particles(n)%z
131                   particle_tail_coordinates(2,4,nn) = particles(n)%class
132                   particle_tail_coordinates(1:2,5,nn) = 0.0
133                   particles(n)%tailpoints = 2
134                ENDIF
135
136             ENDIF
137
138          ENDDO
139
140       ENDIF
141
142       number_of_particles = number_of_particles + number_of_initial_particles
143
144    ENDIF
145
146 END SUBROUTINE lpm_release_set
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