1 | SUBROUTINE lpm_extend_tails |
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2 | |
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3 | !------------------------------------------------------------------------------! |
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4 | ! Current revisions: |
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5 | ! ------------------ |
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6 | ! |
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7 | ! |
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8 | ! Former revisions: |
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9 | ! ----------------- |
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10 | ! $Id: lpm_extend_tails.f90 850 2012-03-15 12:09:25Z raasch $ |
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11 | ! |
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12 | ! 849 2012-03-15 10:35:09Z raasch |
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13 | ! initial revision (former part of advec_particles) |
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14 | ! |
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15 | ! |
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16 | ! Description: |
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17 | ! ------------ |
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18 | ! Add the current particle positions to the particle tails. |
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19 | !------------------------------------------------------------------------------! |
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20 | |
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21 | USE control_parameters |
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22 | USE particle_attributes |
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23 | |
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24 | IMPLICIT NONE |
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25 | |
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26 | INTEGER :: i, n, nn |
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27 | |
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28 | REAL :: distance |
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29 | |
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30 | |
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31 | distance = 0.0 |
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32 | |
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33 | DO n = 1, number_of_particles |
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34 | |
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35 | nn = particles(n)%tail_id |
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36 | |
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37 | IF ( nn /= 0 ) THEN |
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38 | ! |
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39 | !-- Calculate the distance between the actual particle position and the |
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40 | !-- next tailpoint |
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41 | IF ( minimum_tailpoint_distance /= 0.0 ) THEN |
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42 | distance = ( particle_tail_coordinates(1,1,nn) - & |
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43 | particle_tail_coordinates(2,1,nn) )**2 + & |
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44 | ( particle_tail_coordinates(1,2,nn) - & |
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45 | particle_tail_coordinates(2,2,nn) )**2 + & |
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46 | ( particle_tail_coordinates(1,3,nn) - & |
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47 | particle_tail_coordinates(2,3,nn) )**2 |
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48 | ENDIF |
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49 | |
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50 | ! |
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51 | !-- First, increase the index of all existings tailpoints by one |
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52 | IF ( distance >= minimum_tailpoint_distance ) THEN |
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53 | |
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54 | DO i = particles(n)%tailpoints, 1, -1 |
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55 | particle_tail_coordinates(i+1,:,nn) = & |
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56 | particle_tail_coordinates(i,:,nn) |
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57 | ENDDO |
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58 | ! |
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59 | !-- Increase the counter which contains the number of tailpoints. |
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60 | !-- This must always be smaller than the given maximum number of |
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61 | !-- tailpoints because otherwise the index bounds of |
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62 | !-- particle_tail_coordinates would be exceeded |
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63 | IF ( particles(n)%tailpoints < maximum_number_of_tailpoints-1 ) & |
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64 | THEN |
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65 | particles(n)%tailpoints = particles(n)%tailpoints + 1 |
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66 | ENDIF |
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67 | ENDIF |
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68 | ! |
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69 | !-- In any case, store the new point at the beginning of the tail |
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70 | particle_tail_coordinates(1,1,nn) = particles(n)%x |
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71 | particle_tail_coordinates(1,2,nn) = particles(n)%y |
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72 | particle_tail_coordinates(1,3,nn) = particles(n)%z |
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73 | particle_tail_coordinates(1,4,nn) = particles(n)%class |
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74 | ! |
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75 | !-- Increase the age of the tailpoints |
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76 | IF ( minimum_tailpoint_distance /= 0.0 ) THEN |
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77 | particle_tail_coordinates(2:particles(n)%tailpoints,5,nn) = & |
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78 | particle_tail_coordinates(2:particles(n)%tailpoints,5,nn) + dt_3d |
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79 | ! |
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80 | !-- Delete the last tailpoint, if it has exceeded its maximum age |
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81 | IF ( particle_tail_coordinates(particles(n)%tailpoints,5,nn) > & |
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82 | maximum_tailpoint_age ) THEN |
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83 | particles(n)%tailpoints = particles(n)%tailpoints - 1 |
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84 | ENDIF |
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85 | ENDIF |
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86 | |
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87 | ENDIF |
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88 | |
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89 | ENDDO |
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90 | |
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91 | |
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92 | END SUBROUTINE lpm_extend_tails |
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