1 | !> @file lpm.f90 |
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2 | !------------------------------------------------------------------------------! |
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3 | ! This file is part of PALM. |
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4 | ! |
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5 | ! PALM is free software: you can redistribute it and/or modify it under the |
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6 | ! terms of the GNU General Public License as published by the Free Software |
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7 | ! Foundation, either version 3 of the License, or (at your option) any later |
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8 | ! 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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17 | ! Copyright 1997-2017 Leibniz Universitaet Hannover |
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18 | !------------------------------------------------------------------------------! |
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19 | ! |
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20 | ! Current revisions: |
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21 | ! ------------------ |
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22 | ! |
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23 | ! |
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24 | ! Former revisions: |
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25 | ! ----------------- |
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26 | ! $Id: lpm.f90 2606 2017-11-10 10:36:31Z raasch $ |
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27 | ! Changed particle box locations: center of particle box now coincides |
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28 | ! with scalar grid point of same index. |
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29 | ! Renamed module and subroutines: lpm_pack_arrays_mod -> lpm_pack_and_sort_mod |
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30 | ! lpm_pack_all_arrays -> lpm_sort_in_subboxes, lpm_pack_arrays -> lpm_pack |
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31 | ! lpm_sort -> lpm_sort_timeloop_done |
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32 | ! |
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33 | ! 2418 2017-09-06 15:24:24Z suehring |
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34 | ! Major bugfixes in modeling SGS particle speeds (since revision 1359). |
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35 | ! Particle sorting added to distinguish between already completed and |
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36 | ! non-completed particles. |
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37 | ! |
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38 | ! 2263 2017-06-08 14:59:01Z schwenkel |
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39 | ! Implemented splitting and merging algorithm |
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40 | ! |
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41 | ! 2233 2017-05-30 18:08:54Z suehring |
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42 | ! |
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43 | ! 2232 2017-05-30 17:47:52Z suehring |
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44 | ! Adjustments to new topography concept |
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45 | ! |
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46 | ! 2000 2016-08-20 18:09:15Z knoop |
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47 | ! Forced header and separation lines into 80 columns |
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48 | ! |
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49 | ! 1936 2016-06-13 13:37:44Z suehring |
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50 | ! Call routine for deallocation of unused memory. |
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51 | ! Formatting adjustments |
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52 | ! |
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53 | ! 1929 2016-06-09 16:25:25Z suehring |
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54 | ! Call wall boundary conditions only if particles are in the vertical range of |
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55 | ! topography. |
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56 | ! |
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57 | ! 1822 2016-04-07 07:49:42Z hoffmann |
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58 | ! Tails removed. |
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59 | ! |
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60 | ! Initialization of sgs model not necessary for the use of cloud_droplets and |
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61 | ! use_sgs_for_particles. |
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62 | ! |
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63 | ! lpm_release_set integrated. |
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64 | ! |
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65 | ! Unused variabled removed. |
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66 | ! |
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67 | ! 1682 2015-10-07 23:56:08Z knoop |
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68 | ! Code annotations made doxygen readable |
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69 | ! |
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70 | ! 1416 2014-06-04 16:04:03Z suehring |
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71 | ! user_lpm_advec is called for each gridpoint. |
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72 | ! Bugfix: in order to prevent an infinite loop, time_loop_done is set .TRUE. |
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73 | ! at the head of the do-loop. |
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74 | ! |
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75 | ! 1359 2014-04-11 17:15:14Z hoffmann |
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76 | ! New particle structure integrated. |
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77 | ! Kind definition added to all floating point numbers. |
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78 | ! |
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79 | ! 1320 2014-03-20 08:40:49Z raasch |
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80 | ! ONLY-attribute added to USE-statements, |
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81 | ! kind-parameters added to all INTEGER and REAL declaration statements, |
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82 | ! kinds are defined in new module kinds, |
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83 | ! revision history before 2012 removed, |
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84 | ! comment fields (!:) to be used for variable explanations added to |
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85 | ! all variable declaration statements |
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86 | ! |
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87 | ! 1318 2014-03-17 13:35:16Z raasch |
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88 | ! module interfaces removed |
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89 | ! |
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90 | ! 1036 2012-10-22 13:43:42Z raasch |
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91 | ! code put under GPL (PALM 3.9) |
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92 | ! |
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93 | ! 851 2012-03-15 14:32:58Z raasch |
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94 | ! Bugfix: resetting of particle_mask and tail mask moved from routine |
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95 | ! lpm_exchange_horiz to here (end of sub-timestep loop) |
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96 | ! |
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97 | ! 849 2012-03-15 10:35:09Z raasch |
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98 | ! original routine advec_particles split into several subroutines and renamed |
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99 | ! lpm |
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100 | ! |
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101 | ! 831 2012-02-22 00:29:39Z raasch |
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102 | ! thermal_conductivity_l and diff_coeff_l now depend on temperature and |
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103 | ! pressure |
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104 | ! |
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105 | ! 828 2012-02-21 12:00:36Z raasch |
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106 | ! fast hall/wang kernels with fixed radius/dissipation classes added, |
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107 | ! particle feature color renamed class, routine colker renamed |
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108 | ! recalculate_kernel, |
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109 | ! lower limit for droplet radius changed from 1E-7 to 1E-8 |
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110 | ! |
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111 | ! Bugfix: transformation factor for dissipation changed from 1E5 to 1E4 |
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112 | ! |
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113 | ! 825 2012-02-19 03:03:44Z raasch |
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114 | ! droplet growth by condensation may include curvature and solution effects, |
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115 | ! initialisation of temporary particle array for resorting removed, |
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116 | ! particle attributes speed_x|y|z_sgs renamed rvar1|2|3, |
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117 | ! module wang_kernel_mod renamed lpm_collision_kernels_mod, |
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118 | ! wang_collision_kernel renamed wang_kernel |
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119 | ! |
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120 | ! |
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121 | ! Revision 1.1 1999/11/25 16:16:06 raasch |
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122 | ! Initial revision |
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123 | ! |
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124 | ! |
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125 | ! Description: |
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126 | ! ------------ |
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127 | !> Particle advection |
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128 | !------------------------------------------------------------------------------! |
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129 | SUBROUTINE lpm |
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130 | |
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131 | |
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132 | USE arrays_3d, & |
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133 | ONLY: ql_c, ql_v, ql_vp |
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134 | |
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135 | USE control_parameters, & |
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136 | ONLY: cloud_droplets, dt_3d, dt_3d_reached, dt_3d_reached_l, & |
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137 | molecular_viscosity, simulated_time, topography |
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138 | |
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139 | USE cpulog, & |
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140 | ONLY: cpu_log, log_point, log_point_s |
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141 | |
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142 | USE indices, & |
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143 | ONLY: nxl, nxr, nys, nyn, nzb, nzb_max, nzt |
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144 | |
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145 | USE kinds |
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146 | |
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147 | USE lpm_exchange_horiz_mod, & |
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148 | ONLY: dealloc_particles_array, lpm_exchange_horiz, lpm_move_particle |
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149 | |
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150 | USE lpm_init_mod, & |
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151 | ONLY: lpm_create_particle, PHASE_RELEASE |
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152 | |
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153 | USE lpm_pack_and_sort_mod, & |
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154 | ONLY: lpm_sort_in_subboxes, lpm_sort_timeloop_done |
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155 | |
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156 | USE particle_attributes, & |
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157 | ONLY: collision_kernel, deleted_particles, deallocate_memory, & |
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158 | dt_write_particle_data, dt_prel, end_time_prel, & |
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159 | grid_particles, merging, number_of_particles, & |
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160 | number_of_particle_groups, particles, particle_groups, & |
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161 | prt_count, splitting, step_dealloc, time_prel, & |
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162 | time_write_particle_data, trlp_count_sum, trlp_count_recv_sum, & |
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163 | trnp_count_sum, trnp_count_recv_sum, trrp_count_sum, & |
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164 | trrp_count_recv_sum, trsp_count_sum, trsp_count_recv_sum, & |
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165 | use_sgs_for_particles, write_particle_statistics |
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166 | |
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167 | USE pegrid |
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168 | |
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169 | IMPLICIT NONE |
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170 | |
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171 | INTEGER(iwp) :: i !< |
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172 | INTEGER(iwp) :: ie !< |
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173 | INTEGER(iwp) :: is !< |
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174 | INTEGER(iwp) :: j !< |
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175 | INTEGER(iwp) :: je !< |
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176 | INTEGER(iwp) :: js !< |
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177 | INTEGER(iwp), SAVE :: lpm_count = 0 !< |
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178 | INTEGER(iwp) :: k !< |
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179 | INTEGER(iwp) :: ke !< |
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180 | INTEGER(iwp) :: ks !< |
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181 | INTEGER(iwp) :: m !< |
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182 | INTEGER(iwp), SAVE :: steps = 0 !< |
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183 | |
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184 | LOGICAL :: first_loop_stride !< |
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185 | |
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186 | CALL cpu_log( log_point(25), 'lpm', 'start' ) |
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187 | |
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188 | ! |
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189 | !-- Write particle data at current time on file. |
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190 | !-- This has to be done here, before particles are further processed, |
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191 | !-- because they may be deleted within this timestep (in case that |
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192 | !-- dt_write_particle_data = dt_prel = particle_maximum_age). |
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193 | time_write_particle_data = time_write_particle_data + dt_3d |
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194 | IF ( time_write_particle_data >= dt_write_particle_data ) THEN |
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195 | |
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196 | CALL lpm_data_output_particles |
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197 | ! |
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198 | !-- The MOD function allows for changes in the output interval with restart |
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199 | !-- runs. |
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200 | time_write_particle_data = MOD( time_write_particle_data, & |
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201 | MAX( dt_write_particle_data, dt_3d ) ) |
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202 | ENDIF |
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203 | |
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204 | ! |
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205 | !-- Initialize arrays for marking those particles to be deleted after the |
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206 | !-- (sub-) timestep |
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207 | deleted_particles = 0 |
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208 | |
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209 | ! |
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210 | !-- Initialize variables used for accumulating the number of particles |
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211 | !-- exchanged between the subdomains during all sub-timesteps (if sgs |
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212 | !-- velocities are included). These data are output further below on the |
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213 | !-- particle statistics file. |
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214 | trlp_count_sum = 0 |
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215 | trlp_count_recv_sum = 0 |
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216 | trrp_count_sum = 0 |
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217 | trrp_count_recv_sum = 0 |
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218 | trsp_count_sum = 0 |
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219 | trsp_count_recv_sum = 0 |
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220 | trnp_count_sum = 0 |
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221 | trnp_count_recv_sum = 0 |
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222 | |
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223 | |
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224 | ! |
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225 | !-- Calculate exponential term used in case of particle inertia for each |
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226 | !-- of the particle groups |
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227 | DO m = 1, number_of_particle_groups |
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228 | IF ( particle_groups(m)%density_ratio /= 0.0_wp ) THEN |
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229 | particle_groups(m)%exp_arg = & |
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230 | 4.5_wp * particle_groups(m)%density_ratio * & |
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231 | molecular_viscosity / ( particle_groups(m)%radius )**2 |
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232 | |
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233 | particle_groups(m)%exp_term = EXP( -particle_groups(m)%exp_arg * & |
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234 | dt_3d ) |
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235 | ENDIF |
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236 | ENDDO |
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237 | |
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238 | ! |
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239 | !-- If necessary, release new set of particles |
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240 | IF ( time_prel >= dt_prel .AND. end_time_prel > simulated_time ) THEN |
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241 | |
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242 | CALL lpm_create_particle(PHASE_RELEASE) |
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243 | ! |
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244 | !-- The MOD function allows for changes in the output interval with |
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245 | !-- restart runs. |
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246 | time_prel = MOD( time_prel, MAX( dt_prel, dt_3d ) ) |
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247 | |
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248 | ENDIF |
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249 | ! |
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250 | !-- Reset summation arrays |
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251 | IF ( cloud_droplets) THEN |
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252 | ql_c = 0.0_wp |
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253 | ql_v = 0.0_wp |
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254 | ql_vp = 0.0_wp |
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255 | ENDIF |
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256 | |
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257 | first_loop_stride = .TRUE. |
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258 | grid_particles(:,:,:)%time_loop_done = .TRUE. |
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259 | ! |
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260 | !-- Timestep loop for particle advection. |
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261 | !-- This loop has to be repeated until the advection time of every particle |
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262 | !-- (within the total domain!) has reached the LES timestep (dt_3d). |
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263 | !-- In case of including the SGS velocities, the particle timestep may be |
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264 | !-- smaller than the LES timestep (because of the Lagrangian timescale |
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265 | !-- restriction) and particles may require to undergo several particle |
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266 | !-- timesteps, before the LES timestep is reached. Because the number of these |
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267 | !-- particle timesteps to be carried out is unknown at first, these steps are |
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268 | !-- carried out in the following infinite loop with exit condition. |
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269 | DO |
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270 | CALL cpu_log( log_point_s(44), 'lpm_advec', 'start' ) |
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271 | CALL cpu_log( log_point_s(44), 'lpm_advec', 'pause' ) |
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272 | |
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273 | ! |
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274 | !-- If particle advection includes SGS velocity components, calculate the |
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275 | !-- required SGS quantities (i.e. gradients of the TKE, as well as |
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276 | !-- horizontally averaged profiles of the SGS TKE and the resolved-scale |
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277 | !-- velocity variances) |
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278 | IF ( use_sgs_for_particles .AND. .NOT. cloud_droplets ) THEN |
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279 | CALL lpm_init_sgs_tke |
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280 | ENDIF |
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281 | |
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282 | ! |
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283 | !-- In case SGS-particle speed is considered, particles may carry out |
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284 | !-- several particle timesteps. In order to prevent unnecessary |
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285 | !-- treatment of particles that already reached the final time level, |
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286 | !-- particles are sorted into contiguous blocks of finished and |
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287 | !-- not-finished particles, in addition to their already sorting |
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288 | !-- according to their sub-boxes. |
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289 | IF ( .NOT. first_loop_stride .AND. use_sgs_for_particles ) & |
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290 | CALL lpm_sort_timeloop_done |
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291 | |
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292 | DO i = nxl, nxr |
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293 | DO j = nys, nyn |
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294 | DO k = nzb+1, nzt |
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295 | |
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296 | number_of_particles = prt_count(k,j,i) |
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297 | ! |
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298 | !-- If grid cell gets empty, flag must be true |
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299 | IF ( number_of_particles <= 0 ) THEN |
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300 | grid_particles(k,j,i)%time_loop_done = .TRUE. |
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301 | CYCLE |
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302 | ENDIF |
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303 | |
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304 | IF ( .NOT. first_loop_stride .AND. & |
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305 | grid_particles(k,j,i)%time_loop_done ) CYCLE |
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306 | |
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307 | particles => grid_particles(k,j,i)%particles(1:number_of_particles) |
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308 | |
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309 | particles(1:number_of_particles)%particle_mask = .TRUE. |
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310 | ! |
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311 | !-- Initialize the variable storing the total time that a particle |
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312 | !-- has advanced within the timestep procedure |
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313 | IF ( first_loop_stride ) THEN |
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314 | particles(1:number_of_particles)%dt_sum = 0.0_wp |
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315 | ENDIF |
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316 | ! |
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317 | !-- Particle (droplet) growth by condensation/evaporation and |
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318 | !-- collision |
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319 | IF ( cloud_droplets .AND. first_loop_stride) THEN |
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320 | ! |
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321 | !-- Droplet growth by condensation / evaporation |
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322 | CALL lpm_droplet_condensation(i,j,k) |
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323 | ! |
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324 | !-- Particle growth by collision |
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325 | IF ( collision_kernel /= 'none' ) THEN |
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326 | CALL lpm_droplet_collision(i,j,k) |
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327 | ENDIF |
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328 | |
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329 | ENDIF |
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330 | ! |
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331 | !-- Initialize the switch used for the loop exit condition checked |
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332 | !-- at the end of this loop. If at least one particle has failed to |
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333 | !-- reach the LES timestep, this switch will be set false in |
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334 | !-- lpm_advec. |
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335 | dt_3d_reached_l = .TRUE. |
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336 | |
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337 | ! |
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338 | !-- Particle advection |
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339 | CALL lpm_advec(i,j,k) |
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340 | ! |
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341 | !-- Particle reflection from walls. Only applied if the particles |
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342 | !-- are in the vertical range of the topography. (Here, some |
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343 | !-- optimization is still possible.) |
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344 | IF ( topography /= 'flat' .AND. k < nzb_max + 2 ) THEN |
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345 | CALL lpm_boundary_conds( 'walls' ) |
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346 | ENDIF |
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347 | ! |
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348 | !-- User-defined actions after the calculation of the new particle |
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349 | !-- position |
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350 | CALL user_lpm_advec(i,j,k) |
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351 | ! |
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352 | !-- Apply boundary conditions to those particles that have crossed |
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353 | !-- the top or bottom boundary and delete those particles, which are |
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354 | !-- older than allowed |
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355 | CALL lpm_boundary_conds( 'bottom/top' ) |
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356 | ! |
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357 | !--- If not all particles of the actual grid cell have reached the |
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358 | !-- LES timestep, this cell has to do another loop iteration. Due to |
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359 | !-- the fact that particles can move into neighboring grid cells, |
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360 | !-- these neighbor cells also have to perform another loop iteration. |
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361 | !-- Please note, this realization does not work properly if |
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362 | !-- particles move into another subdomain. |
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363 | IF ( .NOT. dt_3d_reached_l ) THEN |
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364 | ks = MAX(nzb+1,k-1) |
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365 | ke = MIN(nzt,k+1) |
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366 | js = MAX(nys,j-1) |
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367 | je = MIN(nyn,j+1) |
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368 | is = MAX(nxl,i-1) |
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369 | ie = MIN(nxr,i+1) |
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370 | grid_particles(ks:ke,js:je,is:ie)%time_loop_done = .FALSE. |
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371 | ELSE |
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372 | grid_particles(k,j,i)%time_loop_done = .TRUE. |
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373 | ENDIF |
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374 | |
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375 | ENDDO |
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376 | ENDDO |
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377 | ENDDO |
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378 | |
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379 | steps = steps + 1 |
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380 | dt_3d_reached_l = ALL(grid_particles(:,:,:)%time_loop_done) |
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381 | ! |
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382 | !-- Find out, if all particles on every PE have completed the LES timestep |
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383 | !-- and set the switch corespondingly |
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384 | #if defined( __parallel ) |
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385 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
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386 | CALL MPI_ALLREDUCE( dt_3d_reached_l, dt_3d_reached, 1, MPI_LOGICAL, & |
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387 | MPI_LAND, comm2d, ierr ) |
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388 | #else |
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389 | dt_3d_reached = dt_3d_reached_l |
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390 | #endif |
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391 | |
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392 | CALL cpu_log( log_point_s(44), 'lpm_advec', 'stop' ) |
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393 | |
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394 | ! |
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395 | !-- Increment time since last release |
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396 | IF ( dt_3d_reached ) time_prel = time_prel + dt_3d |
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397 | ! |
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398 | !-- Apply splitting and merging algorithm |
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399 | IF ( cloud_droplets ) THEN |
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400 | IF ( splitting ) THEN |
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401 | CALL lpm_splitting |
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402 | ENDIF |
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403 | IF ( merging ) THEN |
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404 | CALL lpm_merging |
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405 | ENDIF |
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406 | ENDIF |
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407 | ! |
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408 | !-- Move Particles local to PE to a different grid cell |
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409 | CALL lpm_move_particle |
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410 | |
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411 | ! |
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412 | !-- Horizontal boundary conditions including exchange between subdmains |
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413 | CALL lpm_exchange_horiz |
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414 | ! |
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415 | !-- Pack particles (eliminate those marked for deletion), |
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416 | !-- determine new number of particles |
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417 | CALL lpm_sort_in_subboxes |
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418 | ! |
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419 | !-- Initialize variables for the next (sub-) timestep, i.e., for marking |
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420 | !-- those particles to be deleted after the timestep |
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421 | deleted_particles = 0 |
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422 | |
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423 | IF ( dt_3d_reached ) EXIT |
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424 | |
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425 | first_loop_stride = .FALSE. |
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426 | ENDDO ! timestep loop |
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427 | |
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428 | ! |
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429 | !-- Calculate the new liquid water content for each grid box |
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430 | IF ( cloud_droplets ) CALL lpm_calc_liquid_water_content |
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431 | ! |
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432 | !-- Deallocate unused memory |
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433 | IF ( deallocate_memory .AND. lpm_count == step_dealloc ) THEN |
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434 | CALL dealloc_particles_array |
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435 | lpm_count = 0 |
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436 | ELSEIF ( deallocate_memory ) THEN |
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437 | lpm_count = lpm_count + 1 |
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438 | ENDIF |
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439 | |
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440 | ! |
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441 | !-- Set particle attributes. |
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442 | !-- Feature is not available if collision is activated, because the respective |
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443 | !-- particle attribute (class) is then used for storing the particle radius |
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444 | !-- class. |
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445 | IF ( collision_kernel == 'none' ) CALL lpm_set_attributes |
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446 | |
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447 | ! |
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448 | !-- Set particle attributes defined by the user |
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449 | CALL user_lpm_set_attributes |
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450 | |
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451 | ! |
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452 | !-- Write particle statistics (in particular the number of particles |
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453 | !-- exchanged between the subdomains) on file |
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454 | IF ( write_particle_statistics ) CALL lpm_write_exchange_statistics |
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455 | |
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456 | CALL cpu_log( log_point(25), 'lpm', 'stop' ) |
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457 | |
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458 | END SUBROUTINE lpm |
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