1 | SUBROUTINE lpm |
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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.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 | ! original routine advec_particles split into several subroutines and renamed |
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14 | ! lpm |
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15 | ! |
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16 | ! 831 2012-02-22 00:29:39Z raasch |
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17 | ! thermal_conductivity_l and diff_coeff_l now depend on temperature and |
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18 | ! pressure |
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19 | ! |
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20 | ! 828 2012-02-21 12:00:36Z raasch |
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21 | ! fast hall/wang kernels with fixed radius/dissipation classes added, |
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22 | ! particle feature color renamed class, routine colker renamed |
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23 | ! recalculate_kernel, |
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24 | ! lower limit for droplet radius changed from 1E-7 to 1E-8 |
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25 | ! |
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26 | ! Bugfix: transformation factor for dissipation changed from 1E5 to 1E4 |
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27 | ! |
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28 | ! 825 2012-02-19 03:03:44Z raasch |
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29 | ! droplet growth by condensation may include curvature and solution effects, |
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30 | ! initialisation of temporary particle array for resorting removed, |
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31 | ! particle attributes speed_x|y|z_sgs renamed rvar1|2|3, |
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32 | ! module wang_kernel_mod renamed lpm_collision_kernels_mod, |
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33 | ! wang_collision_kernel renamed wang_kernel |
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34 | ! |
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35 | ! 799 2011-12-21 17:48:03Z franke |
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36 | ! Implementation of Wang collision kernel and corresponding new parameter |
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37 | ! wang_collision_kernel |
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38 | ! |
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39 | ! 792 2011-12-01 raasch |
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40 | ! particle arrays (particles, particles_temp) implemented as pointers in |
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41 | ! order to speed up sorting (see routine sort_particles) |
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42 | ! |
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43 | ! 759 2011-09-15 13:58:31Z raasch |
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44 | ! Splitting of parallel I/O (routine write_particles) |
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45 | ! |
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46 | ! Revision 1.1 1999/11/25 16:16:06 raasch |
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47 | ! Initial revision |
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48 | ! |
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49 | ! |
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50 | ! Description: |
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51 | ! ------------ |
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52 | ! Particle advection |
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53 | !------------------------------------------------------------------------------! |
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54 | |
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55 | USE arrays_3d |
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56 | USE control_parameters |
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57 | USE cpulog |
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58 | USE interfaces |
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59 | USE particle_attributes |
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60 | USE pegrid |
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61 | USE statistics |
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62 | |
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63 | IMPLICIT NONE |
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64 | |
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65 | INTEGER :: m |
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66 | |
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67 | |
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68 | CALL cpu_log( log_point(25), 'lpm', 'start' ) |
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69 | |
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70 | ! |
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71 | !-- Write particle data at current time on file. |
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72 | !-- This has to be done here, before particles are further processed, |
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73 | !-- because they may be deleted within this timestep (in case that |
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74 | !-- dt_write_particle_data = dt_prel = particle_maximum_age). |
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75 | time_write_particle_data = time_write_particle_data + dt_3d |
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76 | IF ( time_write_particle_data >= dt_write_particle_data ) THEN |
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77 | |
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78 | CALL lpm_data_output_particles |
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79 | ! |
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80 | !-- The MOD function allows for changes in the output interval with restart |
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81 | !-- runs. |
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82 | time_write_particle_data = MOD( time_write_particle_data, & |
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83 | MAX( dt_write_particle_data, dt_3d ) ) |
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84 | ENDIF |
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85 | |
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86 | |
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87 | ! |
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88 | !-- Initialize arrays for marking those particles/tails to be deleted after the |
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89 | !-- (sub-) timestep |
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90 | particle_mask = .TRUE. |
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91 | deleted_particles = 0 |
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92 | |
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93 | IF ( use_particle_tails ) THEN |
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94 | tail_mask = .TRUE. |
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95 | ENDIF |
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96 | deleted_tails = 0 |
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97 | |
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98 | |
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99 | ! |
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100 | !-- Initialize variables used for accumulating the number of particles |
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101 | !-- exchanged between the subdomains during all sub-timesteps (if sgs |
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102 | !-- velocities are included). These data are output further below on the |
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103 | !-- particle statistics file. |
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104 | trlp_count_sum = 0 |
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105 | trlp_count_recv_sum = 0 |
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106 | trrp_count_sum = 0 |
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107 | trrp_count_recv_sum = 0 |
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108 | trsp_count_sum = 0 |
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109 | trsp_count_recv_sum = 0 |
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110 | trnp_count_sum = 0 |
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111 | trnp_count_recv_sum = 0 |
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112 | |
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113 | |
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114 | ! |
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115 | !-- Calculate exponential term used in case of particle inertia for each |
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116 | !-- of the particle groups |
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117 | DO m = 1, number_of_particle_groups |
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118 | IF ( particle_groups(m)%density_ratio /= 0.0 ) THEN |
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119 | particle_groups(m)%exp_arg = & |
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120 | 4.5 * particle_groups(m)%density_ratio * & |
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121 | molecular_viscosity / ( particle_groups(m)%radius )**2 |
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122 | particle_groups(m)%exp_term = EXP( -particle_groups(m)%exp_arg * & |
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123 | dt_3d ) |
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124 | ENDIF |
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125 | ENDDO |
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126 | |
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127 | |
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128 | ! |
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129 | !-- Particle (droplet) growth by condensation/evaporation and collision |
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130 | IF ( cloud_droplets ) THEN |
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131 | |
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132 | ! |
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133 | !-- Reset summation arrays |
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134 | ql_c = 0.0; ql_v = 0.0; ql_vp = 0.0 |
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135 | |
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136 | ! |
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137 | !-- Droplet growth by condensation / evaporation |
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138 | CALL lpm_droplet_condensation |
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139 | |
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140 | ! |
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141 | !-- Particle growth by collision |
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142 | IF ( collision_kernel /= 'none' ) CALL lpm_droplet_collision |
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143 | |
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144 | ENDIF |
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145 | |
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146 | |
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147 | ! |
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148 | !-- If particle advection includes SGS velocity components, calculate the |
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149 | !-- required SGS quantities (i.e. gradients of the TKE, as well as horizontally |
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150 | !-- averaged profiles of the SGS TKE and the resolved-scale velocity variances) |
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151 | IF ( use_sgs_for_particles ) CALL lpm_init_sgs_tke |
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152 | |
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153 | |
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154 | ! |
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155 | !-- Initialize the variable storing the total time that a particle has advanced |
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156 | !-- within the timestep procedure |
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157 | particles(1:number_of_particles)%dt_sum = 0.0 |
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158 | |
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159 | |
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160 | ! |
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161 | !-- Timestep loop for particle advection. |
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162 | !-- This loop has to be repeated until the advection time of every particle |
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163 | !-- (within the total domain!) has reached the LES timestep (dt_3d). |
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164 | !-- In case of including the SGS velocities, the particle timestep may be |
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165 | !-- smaller than the LES timestep (because of the Lagrangian timescale restric- |
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166 | !-- tion) and particles may require to undergo several particle timesteps, |
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167 | !-- before the LES timestep is reached. Because the number of these particle |
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168 | !-- timesteps to be carried out is unknown at first, these steps are carried |
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169 | !-- out in the following infinite loop with exit condition. |
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170 | DO |
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171 | |
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172 | CALL cpu_log( log_point_s(44), 'lpm_advec', 'start' ) |
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173 | |
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174 | ! |
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175 | !-- Initialize the switch used for the loop exit condition checked at the |
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176 | !-- end of this loop. |
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177 | !-- If at least one particle has failed to reach the LES timestep, this |
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178 | !-- switch will be set false. |
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179 | dt_3d_reached_l = .TRUE. |
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180 | |
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181 | ! |
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182 | !-- Particle advection |
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183 | CALL lpm_advec |
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184 | |
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185 | ! |
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186 | !-- Particle reflection from walls |
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187 | CALL lpm_boundary_conds( 'walls' ) |
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188 | |
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189 | ! |
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190 | !-- User-defined actions after the calculation of the new particle position |
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191 | CALL user_lpm_advec |
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192 | |
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193 | ! |
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194 | !-- Find out, if all particles on every PE have completed the LES timestep |
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195 | !-- and set the switch corespondingly |
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196 | #if defined( __parallel ) |
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197 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
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198 | CALL MPI_ALLREDUCE( dt_3d_reached_l, dt_3d_reached, 1, MPI_LOGICAL, & |
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199 | MPI_LAND, comm2d, ierr ) |
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200 | #else |
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201 | dt_3d_reached = dt_3d_reached_l |
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202 | #endif |
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203 | |
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204 | CALL cpu_log( log_point_s(44), 'lpm_advec', 'stop' ) |
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205 | |
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206 | ! |
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207 | !-- Increment time since last release |
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208 | IF ( dt_3d_reached ) time_prel = time_prel + dt_3d |
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209 | |
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210 | ! |
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211 | !-- If necessary, release new set of particles |
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212 | IF ( time_prel >= dt_prel .AND. end_time_prel > simulated_time .AND. & |
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213 | dt_3d_reached ) THEN |
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214 | |
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215 | CALL lpm_release_set |
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216 | |
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217 | ! |
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218 | !-- The MOD function allows for changes in the output interval with |
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219 | !-- restart runs. |
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220 | time_prel = MOD( time_prel, MAX( dt_prel, dt_3d ) ) |
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221 | |
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222 | ENDIF |
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223 | |
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224 | ! |
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225 | !-- Horizontal boundary conditions including exchange between subdmains |
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226 | CALL lpm_exchange_horiz |
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227 | |
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228 | ! |
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229 | !-- Apply boundary conditions to those particles that have crossed the top or |
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230 | !-- bottom boundary and delete those particles, which are older than allowed |
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231 | CALL lpm_boundary_conds( 'bottom/top' ) |
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232 | |
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233 | ! |
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234 | !-- Pack particles (eliminate those marked for deletion), |
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235 | !-- determine new number of particles |
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236 | IF ( number_of_particles > 0 .AND. deleted_particles > 0 ) THEN |
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237 | CALL lpm_pack_arrays |
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238 | ENDIF |
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239 | |
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240 | IF ( dt_3d_reached ) EXIT |
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241 | |
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242 | ENDDO ! timestep loop |
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243 | |
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244 | |
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245 | ! |
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246 | !-- Sort particles in the sequence the gridboxes are stored in the memory |
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247 | time_sort_particles = time_sort_particles + dt_3d |
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248 | IF ( time_sort_particles >= dt_sort_particles ) THEN |
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249 | CALL lpm_sort_arrays |
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250 | time_sort_particles = MOD( time_sort_particles, & |
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251 | MAX( dt_sort_particles, dt_3d ) ) |
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252 | ENDIF |
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253 | |
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254 | |
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255 | ! |
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256 | !-- Calculate the new liquid water content for each grid box |
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257 | IF ( cloud_droplets ) CALL lpm_calc_liquid_water_content |
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258 | |
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259 | |
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260 | ! |
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261 | !-- Set particle attributes. |
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262 | !-- Feature is not available if collision is activated, because the respective |
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263 | !-- particle attribute (class) is then used for storing the particle radius |
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264 | !-- class. |
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265 | IF ( collision_kernel == 'none' ) CALL lpm_set_attributes |
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266 | |
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267 | |
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268 | ! |
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269 | !-- Set particle attributes defined by the user |
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270 | CALL user_lpm_set_attributes |
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271 | |
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272 | |
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273 | ! |
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274 | !-- If required, add the current particle positions to the particle tails |
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275 | IF ( use_particle_tails ) CALL lpm_extend_tails |
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276 | |
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277 | |
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278 | ! |
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279 | !-- Write particle statistics (in particular the number of particles |
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280 | !-- exchanged between the subdomains) on file |
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281 | IF ( write_particle_statistics ) CALL lpm_write_exchange_statistics |
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282 | |
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283 | CALL cpu_log( log_point(25), 'lpm', 'stop' ) |
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284 | |
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285 | |
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286 | END SUBROUTINE lpm |
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