[1682] | 1 | !> @file lpm.f90 |
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[2000] | 2 | !------------------------------------------------------------------------------! |
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[1036] | 3 | ! This file is part of PALM. |
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| 4 | ! |
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[2000] | 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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[1036] | 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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[1818] | 17 | ! Copyright 1997-2016 Leibniz Universitaet Hannover |
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[2000] | 18 | !------------------------------------------------------------------------------! |
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[1036] | 19 | ! |
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[230] | 20 | ! Current revisions: |
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[759] | 21 | ! ------------------ |
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[2000] | 22 | ! Forced header and separation lines into 80 columns |
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[1823] | 23 | ! |
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| 24 | ! Former revisions: |
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| 25 | ! ----------------- |
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| 26 | ! $Id: lpm.f90 2000 2016-08-20 18:09:15Z knoop $ |
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| 27 | ! |
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[1937] | 28 | ! 1936 2016-06-13 13:37:44Z suehring |
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| 29 | ! Call routine for deallocation of unused memory. |
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| 30 | ! Formatting adjustments |
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| 31 | ! |
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[1930] | 32 | ! 1929 2016-06-09 16:25:25Z suehring |
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| 33 | ! Call wall boundary conditions only if particles are in the vertical range of |
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| 34 | ! topography. |
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| 35 | ! |
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[1823] | 36 | ! 1822 2016-04-07 07:49:42Z hoffmann |
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[1822] | 37 | ! Tails removed. |
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| 38 | ! |
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| 39 | ! Initialization of sgs model not necessary for the use of cloud_droplets and |
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| 40 | ! use_sgs_for_particles. |
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| 41 | ! |
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| 42 | ! lpm_release_set integrated. |
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| 43 | ! |
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| 44 | ! Unused variabled removed. |
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[1321] | 45 | ! |
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[1683] | 46 | ! 1682 2015-10-07 23:56:08Z knoop |
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| 47 | ! Code annotations made doxygen readable |
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| 48 | ! |
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[1417] | 49 | ! 1416 2014-06-04 16:04:03Z suehring |
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| 50 | ! user_lpm_advec is called for each gridpoint. |
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| 51 | ! Bugfix: in order to prevent an infinite loop, time_loop_done is set .TRUE. |
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| 52 | ! at the head of the do-loop. |
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| 53 | ! |
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[1360] | 54 | ! 1359 2014-04-11 17:15:14Z hoffmann |
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| 55 | ! New particle structure integrated. |
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| 56 | ! Kind definition added to all floating point numbers. |
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| 57 | ! |
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[1321] | 58 | ! 1320 2014-03-20 08:40:49Z raasch |
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[1320] | 59 | ! ONLY-attribute added to USE-statements, |
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| 60 | ! kind-parameters added to all INTEGER and REAL declaration statements, |
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| 61 | ! kinds are defined in new module kinds, |
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| 62 | ! revision history before 2012 removed, |
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| 63 | ! comment fields (!:) to be used for variable explanations added to |
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| 64 | ! all variable declaration statements |
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[829] | 65 | ! |
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[1319] | 66 | ! 1318 2014-03-17 13:35:16Z raasch |
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| 67 | ! module interfaces removed |
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| 68 | ! |
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[1037] | 69 | ! 1036 2012-10-22 13:43:42Z raasch |
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| 70 | ! code put under GPL (PALM 3.9) |
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| 71 | ! |
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[852] | 72 | ! 851 2012-03-15 14:32:58Z raasch |
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| 73 | ! Bugfix: resetting of particle_mask and tail mask moved from routine |
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| 74 | ! lpm_exchange_horiz to here (end of sub-timestep loop) |
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| 75 | ! |
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[850] | 76 | ! 849 2012-03-15 10:35:09Z raasch |
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| 77 | ! original routine advec_particles split into several subroutines and renamed |
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| 78 | ! lpm |
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| 79 | ! |
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[832] | 80 | ! 831 2012-02-22 00:29:39Z raasch |
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| 81 | ! thermal_conductivity_l and diff_coeff_l now depend on temperature and |
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| 82 | ! pressure |
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| 83 | ! |
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[829] | 84 | ! 828 2012-02-21 12:00:36Z raasch |
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[828] | 85 | ! fast hall/wang kernels with fixed radius/dissipation classes added, |
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| 86 | ! particle feature color renamed class, routine colker renamed |
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| 87 | ! recalculate_kernel, |
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| 88 | ! lower limit for droplet radius changed from 1E-7 to 1E-8 |
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[826] | 89 | ! |
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[828] | 90 | ! Bugfix: transformation factor for dissipation changed from 1E5 to 1E4 |
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| 91 | ! |
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[826] | 92 | ! 825 2012-02-19 03:03:44Z raasch |
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[825] | 93 | ! droplet growth by condensation may include curvature and solution effects, |
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| 94 | ! initialisation of temporary particle array for resorting removed, |
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| 95 | ! particle attributes speed_x|y|z_sgs renamed rvar1|2|3, |
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| 96 | ! module wang_kernel_mod renamed lpm_collision_kernels_mod, |
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| 97 | ! wang_collision_kernel renamed wang_kernel |
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[482] | 98 | ! |
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[800] | 99 | ! |
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[1] | 100 | ! Revision 1.1 1999/11/25 16:16:06 raasch |
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| 101 | ! Initial revision |
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| 102 | ! |
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| 103 | ! |
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| 104 | ! Description: |
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| 105 | ! ------------ |
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[1682] | 106 | !> Particle advection |
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[1] | 107 | !------------------------------------------------------------------------------! |
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[1682] | 108 | SUBROUTINE lpm |
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| 109 | |
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[1] | 110 | |
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[1320] | 111 | USE arrays_3d, & |
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| 112 | ONLY: ql_c, ql_v, ql_vp |
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| 113 | |
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| 114 | USE control_parameters, & |
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| 115 | ONLY: cloud_droplets, dt_3d, dt_3d_reached, dt_3d_reached_l, & |
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[1359] | 116 | molecular_viscosity, simulated_time, topography |
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[1320] | 117 | |
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| 118 | USE cpulog, & |
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| 119 | ONLY: cpu_log, log_point, log_point_s |
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| 120 | |
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[1359] | 121 | USE indices, & |
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[1929] | 122 | ONLY: nxl, nxr, nys, nyn, nzb, nzb_max, nzt, nzb_w_inner |
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[1359] | 123 | |
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[1320] | 124 | USE kinds |
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| 125 | |
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[1359] | 126 | USE lpm_exchange_horiz_mod, & |
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[1936] | 127 | ONLY: dealloc_particles_array, lpm_exchange_horiz, lpm_move_particle |
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[1359] | 128 | |
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[1822] | 129 | USE lpm_init_mod, & |
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| 130 | ONLY: lpm_create_particle, PHASE_RELEASE |
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| 131 | |
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[1359] | 132 | USE lpm_pack_arrays_mod, & |
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| 133 | ONLY: lpm_pack_all_arrays |
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| 134 | |
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[1320] | 135 | USE particle_attributes, & |
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[1936] | 136 | ONLY: collision_kernel, deleted_particles, deallocate_memory, & |
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[1359] | 137 | dt_write_particle_data, dt_prel, end_time_prel, & |
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| 138 | grid_particles, number_of_particles, number_of_particle_groups, & |
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[1936] | 139 | particles, particle_groups, prt_count, step_dealloc, & |
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| 140 | time_prel, time_write_particle_data, trlp_count_sum, & |
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| 141 | trlp_count_recv_sum, trnp_count_sum, & |
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[1359] | 142 | trnp_count_recv_sum, trrp_count_sum, trrp_count_recv_sum, & |
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[1822] | 143 | trsp_count_sum, trsp_count_recv_sum, & |
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[1359] | 144 | use_sgs_for_particles, write_particle_statistics |
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[1320] | 145 | |
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[1] | 146 | USE pegrid |
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| 147 | |
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| 148 | IMPLICIT NONE |
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| 149 | |
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[1682] | 150 | INTEGER(iwp) :: i !< |
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| 151 | INTEGER(iwp) :: ie !< |
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| 152 | INTEGER(iwp) :: is !< |
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| 153 | INTEGER(iwp) :: j !< |
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| 154 | INTEGER(iwp) :: je !< |
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| 155 | INTEGER(iwp) :: js !< |
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[1936] | 156 | INTEGER(iwp), SAVE :: lpm_count = 0 !< |
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[1682] | 157 | INTEGER(iwp) :: k !< |
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| 158 | INTEGER(iwp) :: ke !< |
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| 159 | INTEGER(iwp) :: ks !< |
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| 160 | INTEGER(iwp) :: m !< |
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| 161 | INTEGER(iwp), SAVE :: steps = 0 !< |
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[1] | 162 | |
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[1682] | 163 | LOGICAL :: first_loop_stride !< |
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[60] | 164 | |
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[849] | 165 | CALL cpu_log( log_point(25), 'lpm', 'start' ) |
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[824] | 166 | |
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[849] | 167 | ! |
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| 168 | !-- Write particle data at current time on file. |
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| 169 | !-- This has to be done here, before particles are further processed, |
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| 170 | !-- because they may be deleted within this timestep (in case that |
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| 171 | !-- dt_write_particle_data = dt_prel = particle_maximum_age). |
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| 172 | time_write_particle_data = time_write_particle_data + dt_3d |
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| 173 | IF ( time_write_particle_data >= dt_write_particle_data ) THEN |
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[1] | 174 | |
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[849] | 175 | CALL lpm_data_output_particles |
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[824] | 176 | ! |
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[849] | 177 | !-- The MOD function allows for changes in the output interval with restart |
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| 178 | !-- runs. |
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| 179 | time_write_particle_data = MOD( time_write_particle_data, & |
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| 180 | MAX( dt_write_particle_data, dt_3d ) ) |
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| 181 | ENDIF |
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[1] | 182 | |
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[849] | 183 | ! |
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[1822] | 184 | !-- Initialize arrays for marking those particles to be deleted after the |
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[849] | 185 | !-- (sub-) timestep |
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| 186 | deleted_particles = 0 |
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[60] | 187 | |
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[1] | 188 | ! |
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[849] | 189 | !-- Initialize variables used for accumulating the number of particles |
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| 190 | !-- exchanged between the subdomains during all sub-timesteps (if sgs |
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| 191 | !-- velocities are included). These data are output further below on the |
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| 192 | !-- particle statistics file. |
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| 193 | trlp_count_sum = 0 |
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| 194 | trlp_count_recv_sum = 0 |
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| 195 | trrp_count_sum = 0 |
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| 196 | trrp_count_recv_sum = 0 |
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| 197 | trsp_count_sum = 0 |
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| 198 | trsp_count_recv_sum = 0 |
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| 199 | trnp_count_sum = 0 |
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| 200 | trnp_count_recv_sum = 0 |
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[1] | 201 | |
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| 202 | |
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| 203 | ! |
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| 204 | !-- Calculate exponential term used in case of particle inertia for each |
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| 205 | !-- of the particle groups |
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| 206 | DO m = 1, number_of_particle_groups |
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[1359] | 207 | IF ( particle_groups(m)%density_ratio /= 0.0_wp ) THEN |
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[1] | 208 | particle_groups(m)%exp_arg = & |
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[1359] | 209 | 4.5_wp * particle_groups(m)%density_ratio * & |
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[1] | 210 | molecular_viscosity / ( particle_groups(m)%radius )**2 |
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[1359] | 211 | |
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| 212 | particle_groups(m)%exp_term = EXP( -particle_groups(m)%exp_arg * & |
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| 213 | dt_3d ) |
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[1] | 214 | ENDIF |
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| 215 | ENDDO |
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| 216 | |
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| 217 | ! |
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[1359] | 218 | !-- If necessary, release new set of particles |
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| 219 | IF ( time_prel >= dt_prel .AND. end_time_prel > simulated_time ) THEN |
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[1] | 220 | |
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[1822] | 221 | CALL lpm_create_particle(PHASE_RELEASE) |
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[1] | 222 | ! |
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[1359] | 223 | !-- The MOD function allows for changes in the output interval with |
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| 224 | !-- restart runs. |
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| 225 | time_prel = MOD( time_prel, MAX( dt_prel, dt_3d ) ) |
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[1] | 226 | |
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[1359] | 227 | ENDIF |
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[1] | 228 | ! |
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[1359] | 229 | !-- Reset summation arrays |
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| 230 | IF ( cloud_droplets) THEN |
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| 231 | ql_c = 0.0_wp |
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| 232 | ql_v = 0.0_wp |
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| 233 | ql_vp = 0.0_wp |
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[849] | 234 | ENDIF |
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[420] | 235 | |
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[1359] | 236 | first_loop_stride = .TRUE. |
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| 237 | grid_particles(:,:,:)%time_loop_done = .TRUE. |
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[1] | 238 | ! |
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[849] | 239 | !-- Timestep loop for particle advection. |
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[1] | 240 | !-- This loop has to be repeated until the advection time of every particle |
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[849] | 241 | !-- (within the total domain!) has reached the LES timestep (dt_3d). |
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| 242 | !-- In case of including the SGS velocities, the particle timestep may be |
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[1359] | 243 | !-- smaller than the LES timestep (because of the Lagrangian timescale |
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| 244 | !-- restriction) and particles may require to undergo several particle |
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| 245 | !-- timesteps, before the LES timestep is reached. Because the number of these |
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| 246 | !-- particle timesteps to be carried out is unknown at first, these steps are |
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| 247 | !-- carried out in the following infinite loop with exit condition. |
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[1] | 248 | DO |
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[849] | 249 | CALL cpu_log( log_point_s(44), 'lpm_advec', 'start' ) |
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[1359] | 250 | CALL cpu_log( log_point_s(44), 'lpm_advec', 'pause' ) |
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[1416] | 251 | |
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| 252 | grid_particles(:,:,:)%time_loop_done = .TRUE. |
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[1359] | 253 | ! |
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| 254 | !-- If particle advection includes SGS velocity components, calculate the |
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| 255 | !-- required SGS quantities (i.e. gradients of the TKE, as well as |
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| 256 | !-- horizontally averaged profiles of the SGS TKE and the resolved-scale |
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| 257 | !-- velocity variances) |
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[1] | 258 | |
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[1822] | 259 | IF ( use_sgs_for_particles .AND. .NOT. cloud_droplets ) THEN |
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| 260 | CALL lpm_init_sgs_tke |
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| 261 | ENDIF |
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[1359] | 262 | |
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| 263 | DO i = nxl, nxr |
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| 264 | DO j = nys, nyn |
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| 265 | DO k = nzb+1, nzt |
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| 266 | |
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| 267 | number_of_particles = prt_count(k,j,i) |
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[1] | 268 | ! |
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[1359] | 269 | !-- If grid cell gets empty, flag must be true |
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| 270 | IF ( number_of_particles <= 0 ) THEN |
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| 271 | grid_particles(k,j,i)%time_loop_done = .TRUE. |
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| 272 | CYCLE |
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| 273 | ENDIF |
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[1] | 274 | |
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[1359] | 275 | IF ( .NOT. first_loop_stride .AND. & |
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| 276 | grid_particles(k,j,i)%time_loop_done ) CYCLE |
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| 277 | |
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| 278 | particles => grid_particles(k,j,i)%particles(1:number_of_particles) |
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| 279 | |
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| 280 | particles(1:number_of_particles)%particle_mask = .TRUE. |
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[1] | 281 | ! |
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[1359] | 282 | !-- Initialize the variable storing the total time that a particle |
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| 283 | !-- has advanced within the timestep procedure |
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| 284 | IF ( first_loop_stride ) THEN |
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| 285 | particles(1:number_of_particles)%dt_sum = 0.0_wp |
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| 286 | ENDIF |
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| 287 | ! |
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| 288 | !-- Particle (droplet) growth by condensation/evaporation and |
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| 289 | !-- collision |
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| 290 | IF ( cloud_droplets .AND. first_loop_stride) THEN |
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| 291 | ! |
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| 292 | !-- Droplet growth by condensation / evaporation |
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| 293 | CALL lpm_droplet_condensation(i,j,k) |
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| 294 | ! |
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| 295 | !-- Particle growth by collision |
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| 296 | IF ( collision_kernel /= 'none' ) THEN |
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| 297 | CALL lpm_droplet_collision(i,j,k) |
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| 298 | ENDIF |
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[1] | 299 | |
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[1359] | 300 | ENDIF |
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[1] | 301 | ! |
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[1359] | 302 | !-- Initialize the switch used for the loop exit condition checked |
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| 303 | !-- at the end of this loop. If at least one particle has failed to |
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| 304 | !-- reach the LES timestep, this switch will be set false in |
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| 305 | !-- lpm_advec. |
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| 306 | dt_3d_reached_l = .TRUE. |
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[57] | 307 | |
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| 308 | ! |
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[1359] | 309 | !-- Particle advection |
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| 310 | CALL lpm_advec(i,j,k) |
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| 311 | ! |
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[1929] | 312 | !-- Particle reflection from walls. Only applied if the particles |
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| 313 | !-- are in the vertical range of the topography. (Here, some |
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| 314 | !-- optimization is still possible.) |
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| 315 | IF ( topography /= 'flat' .AND. k < nzb_max + 2 ) THEN |
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[1359] | 316 | CALL lpm_boundary_conds( 'walls' ) |
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| 317 | ENDIF |
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| 318 | ! |
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| 319 | !-- User-defined actions after the calculation of the new particle |
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| 320 | !-- position |
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[1416] | 321 | CALL user_lpm_advec(i,j,k) |
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[1359] | 322 | ! |
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| 323 | !-- Apply boundary conditions to those particles that have crossed |
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| 324 | !-- the top or bottom boundary and delete those particles, which are |
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| 325 | !-- older than allowed |
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| 326 | CALL lpm_boundary_conds( 'bottom/top' ) |
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| 327 | ! |
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| 328 | !--- If not all particles of the actual grid cell have reached the |
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| 329 | !-- LES timestep, this cell has to to another loop iteration. Due to |
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| 330 | !-- the fact that particles can move into neighboring grid cell, |
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| 331 | !-- these neighbor cells also have to perform another loop iteration |
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| 332 | IF ( .NOT. dt_3d_reached_l ) THEN |
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| 333 | ks = MAX(nzb+1,k) |
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| 334 | ke = MIN(nzt,k) |
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| 335 | js = MAX(nys,j) |
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| 336 | je = MIN(nyn,j) |
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| 337 | is = MAX(nxl,i) |
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| 338 | ie = MIN(nxr,i) |
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| 339 | grid_particles(ks:ke,js:je,is:ie)%time_loop_done = .FALSE. |
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| 340 | ENDIF |
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[57] | 341 | |
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[1359] | 342 | ENDDO |
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| 343 | ENDDO |
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| 344 | ENDDO |
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| 345 | |
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| 346 | steps = steps + 1 |
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| 347 | dt_3d_reached_l = ALL(grid_particles(:,:,:)%time_loop_done) |
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[57] | 348 | ! |
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[1] | 349 | !-- Find out, if all particles on every PE have completed the LES timestep |
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| 350 | !-- and set the switch corespondingly |
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| 351 | #if defined( __parallel ) |
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[622] | 352 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
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[1] | 353 | CALL MPI_ALLREDUCE( dt_3d_reached_l, dt_3d_reached, 1, MPI_LOGICAL, & |
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| 354 | MPI_LAND, comm2d, ierr ) |
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| 355 | #else |
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| 356 | dt_3d_reached = dt_3d_reached_l |
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[799] | 357 | #endif |
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[1] | 358 | |
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[849] | 359 | CALL cpu_log( log_point_s(44), 'lpm_advec', 'stop' ) |
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[1] | 360 | |
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| 361 | ! |
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| 362 | !-- Increment time since last release |
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| 363 | IF ( dt_3d_reached ) time_prel = time_prel + dt_3d |
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| 364 | |
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| 365 | ! |
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[1359] | 366 | !-- Move Particles local to PE to a different grid cell |
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| 367 | CALL lpm_move_particle |
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[1] | 368 | |
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| 369 | ! |
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[849] | 370 | !-- Horizontal boundary conditions including exchange between subdmains |
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| 371 | CALL lpm_exchange_horiz |
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[1] | 372 | ! |
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| 373 | !-- Pack particles (eliminate those marked for deletion), |
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| 374 | !-- determine new number of particles |
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[1359] | 375 | CALL lpm_pack_all_arrays |
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[1] | 376 | |
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[851] | 377 | ! |
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[1359] | 378 | !-- Initialize variables for the next (sub-) timestep, i.e., for marking |
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| 379 | !-- those particles to be deleted after the timestep |
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[851] | 380 | deleted_particles = 0 |
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| 381 | |
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[1] | 382 | IF ( dt_3d_reached ) EXIT |
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| 383 | |
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[1359] | 384 | first_loop_stride = .FALSE. |
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[1] | 385 | ENDDO ! timestep loop |
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| 386 | |
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| 387 | ! |
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[1359] | 388 | !-- Calculate the new liquid water content for each grid box |
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[1936] | 389 | IF ( cloud_droplets ) CALL lpm_calc_liquid_water_content |
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| 390 | ! |
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| 391 | !-- Deallocate unused memory |
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| 392 | IF ( deallocate_memory .AND. lpm_count == step_dealloc ) THEN |
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| 393 | CALL dealloc_particles_array |
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| 394 | lpm_count = 0 |
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| 395 | ELSEIF ( deallocate_memory ) THEN |
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| 396 | lpm_count = lpm_count + 1 |
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[116] | 397 | ENDIF |
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| 398 | |
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[1] | 399 | ! |
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[828] | 400 | !-- Set particle attributes. |
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| 401 | !-- Feature is not available if collision is activated, because the respective |
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| 402 | !-- particle attribute (class) is then used for storing the particle radius |
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| 403 | !-- class. |
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[849] | 404 | IF ( collision_kernel == 'none' ) CALL lpm_set_attributes |
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[264] | 405 | |
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| 406 | ! |
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[1] | 407 | !-- Set particle attributes defined by the user |
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[849] | 408 | CALL user_lpm_set_attributes |
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[1] | 409 | |
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| 410 | ! |
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[849] | 411 | !-- Write particle statistics (in particular the number of particles |
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| 412 | !-- exchanged between the subdomains) on file |
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| 413 | IF ( write_particle_statistics ) CALL lpm_write_exchange_statistics |
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[1] | 414 | |
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[849] | 415 | CALL cpu_log( log_point(25), 'lpm', 'stop' ) |
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[1] | 416 | |
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[849] | 417 | END SUBROUTINE lpm |
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