[849] | 1 | SUBROUTINE lpm_extend_tails |
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| 2 | |
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[1036] | 3 | !--------------------------------------------------------------------------------! |
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| 4 | ! This file is part of PALM. |
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| 5 | ! |
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| 6 | ! PALM is free software: you can redistribute it and/or modify it under the terms |
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| 7 | ! of the GNU General Public License as published by the Free Software Foundation, |
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| 8 | ! either version 3 of the License, or (at your option) any later version. |
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| 9 | ! |
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| 10 | ! PALM is distributed in the hope that it will be useful, but WITHOUT ANY |
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| 11 | ! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR |
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| 12 | ! A PARTICULAR PURPOSE. See the GNU General Public License for more details. |
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| 13 | ! |
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| 14 | ! You should have received a copy of the GNU General Public License along with |
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| 15 | ! PALM. If not, see <http://www.gnu.org/licenses/>. |
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| 16 | ! |
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[1310] | 17 | ! Copyright 1997-2014 Leibniz Universitaet Hannover |
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[1036] | 18 | !--------------------------------------------------------------------------------! |
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| 19 | ! |
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[849] | 20 | ! Current revisions: |
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| 21 | ! ------------------ |
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[1320] | 22 | ! ONLY-attribute added to USE-statements, |
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| 23 | ! kind-parameters added to all INTEGER and REAL declaration statements, |
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| 24 | ! kinds are defined in new module kinds, |
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| 25 | ! comment fields (!:) to be used for variable explanations added to |
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| 26 | ! all variable declaration statements |
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[849] | 27 | ! |
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| 28 | ! Former revisions: |
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| 29 | ! ----------------- |
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| 30 | ! $Id: lpm_extend_tails.f90 1320 2014-03-20 08:40:49Z raasch $ |
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| 31 | ! |
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[1037] | 32 | ! 1036 2012-10-22 13:43:42Z raasch |
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| 33 | ! code put under GPL (PALM 3.9) |
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| 34 | ! |
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[850] | 35 | ! 849 2012-03-15 10:35:09Z raasch |
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| 36 | ! initial revision (former part of advec_particles) |
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[849] | 37 | ! |
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[850] | 38 | ! |
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[849] | 39 | ! Description: |
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| 40 | ! ------------ |
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| 41 | ! Add the current particle positions to the particle tails. |
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| 42 | !------------------------------------------------------------------------------! |
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| 43 | |
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[1320] | 44 | USE control_parameters, & |
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| 45 | ONLY: dt_3d |
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[849] | 46 | |
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[1320] | 47 | USE kinds |
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| 48 | |
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| 49 | USE particle_attributes, & |
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| 50 | ONLY: maximum_number_of_tailpoints, maximum_tailpoint_age, & |
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| 51 | minimum_tailpoint_distance, number_of_particles, particles, & |
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| 52 | particle_tail_coordinates |
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| 53 | |
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[849] | 54 | IMPLICIT NONE |
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| 55 | |
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[1320] | 56 | INTEGER(iwp) :: i !: |
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| 57 | INTEGER(iwp) :: n !: |
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| 58 | INTEGER(iwp) :: nn !: |
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[849] | 59 | |
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[1320] | 60 | REAL(wp) :: distance !: |
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[849] | 61 | |
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| 62 | |
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| 63 | distance = 0.0 |
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| 64 | |
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| 65 | DO n = 1, number_of_particles |
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| 66 | |
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| 67 | nn = particles(n)%tail_id |
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| 68 | |
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| 69 | IF ( nn /= 0 ) THEN |
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| 70 | ! |
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| 71 | !-- Calculate the distance between the actual particle position and the |
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| 72 | !-- next tailpoint |
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| 73 | IF ( minimum_tailpoint_distance /= 0.0 ) THEN |
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| 74 | distance = ( particle_tail_coordinates(1,1,nn) - & |
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| 75 | particle_tail_coordinates(2,1,nn) )**2 + & |
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| 76 | ( particle_tail_coordinates(1,2,nn) - & |
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| 77 | particle_tail_coordinates(2,2,nn) )**2 + & |
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| 78 | ( particle_tail_coordinates(1,3,nn) - & |
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| 79 | particle_tail_coordinates(2,3,nn) )**2 |
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| 80 | ENDIF |
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| 81 | |
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| 82 | ! |
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| 83 | !-- First, increase the index of all existings tailpoints by one |
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| 84 | IF ( distance >= minimum_tailpoint_distance ) THEN |
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| 85 | |
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| 86 | DO i = particles(n)%tailpoints, 1, -1 |
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| 87 | particle_tail_coordinates(i+1,:,nn) = & |
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| 88 | particle_tail_coordinates(i,:,nn) |
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| 89 | ENDDO |
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| 90 | ! |
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| 91 | !-- Increase the counter which contains the number of tailpoints. |
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| 92 | !-- This must always be smaller than the given maximum number of |
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| 93 | !-- tailpoints because otherwise the index bounds of |
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| 94 | !-- particle_tail_coordinates would be exceeded |
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| 95 | IF ( particles(n)%tailpoints < maximum_number_of_tailpoints-1 ) & |
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| 96 | THEN |
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| 97 | particles(n)%tailpoints = particles(n)%tailpoints + 1 |
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| 98 | ENDIF |
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| 99 | ENDIF |
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| 100 | ! |
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| 101 | !-- In any case, store the new point at the beginning of the tail |
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| 102 | particle_tail_coordinates(1,1,nn) = particles(n)%x |
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| 103 | particle_tail_coordinates(1,2,nn) = particles(n)%y |
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| 104 | particle_tail_coordinates(1,3,nn) = particles(n)%z |
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| 105 | particle_tail_coordinates(1,4,nn) = particles(n)%class |
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| 106 | ! |
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| 107 | !-- Increase the age of the tailpoints |
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| 108 | IF ( minimum_tailpoint_distance /= 0.0 ) THEN |
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| 109 | particle_tail_coordinates(2:particles(n)%tailpoints,5,nn) = & |
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| 110 | particle_tail_coordinates(2:particles(n)%tailpoints,5,nn) + dt_3d |
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| 111 | ! |
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| 112 | !-- Delete the last tailpoint, if it has exceeded its maximum age |
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| 113 | IF ( particle_tail_coordinates(particles(n)%tailpoints,5,nn) > & |
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| 114 | maximum_tailpoint_age ) THEN |
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| 115 | particles(n)%tailpoints = particles(n)%tailpoints - 1 |
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| 116 | ENDIF |
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| 117 | ENDIF |
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| 118 | |
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| 119 | ENDIF |
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| 120 | |
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| 121 | ENDDO |
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| 122 | |
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| 123 | |
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| 124 | END SUBROUTINE lpm_extend_tails |
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