| 1 | !> @file lpm_boundary_conds.f90 |
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| 2 | !------------------------------------------------------------------------------! |
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| 3 | ! This file is part of the PALM model system. |
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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 1997-2018 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_boundary_conds.f90 3067 2018-06-12 14:04:34Z maronga $ |
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| 27 | ! Remove write statements |
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| 28 | ! |
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| 29 | ! 2801 2018-02-14 16:01:55Z thiele |
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| 30 | ! Introduce particle transfer in nested models. |
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| 31 | ! |
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| 32 | ! 2718 2018-01-02 08:49:38Z maronga |
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| 33 | ! Corrected "Former revisions" section |
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| 34 | ! |
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| 35 | ! 2701 2017-12-15 15:40:50Z suehring |
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| 36 | ! Changes from last commit documented |
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| 37 | ! |
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| 38 | ! 2698 2017-12-14 18:46:24Z suehring |
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| 39 | ! Particle reflections at downward-facing walls implemented. Moreover, |
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| 40 | ! reflections are adjusted to revised particle grid box location. |
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| 41 | ! (responsible Philipp Thiele) |
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| 42 | ! |
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| 43 | ! 2696 2017-12-14 17:12:51Z kanani |
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| 44 | ! Change in file header (GPL part) |
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| 45 | ! |
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| 46 | ! 2606 2017-11-10 10:36:31Z schwenkel |
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| 47 | ! Changed particle box locations: center of particle box now coincides |
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| 48 | ! with scalar grid point of same index. |
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| 49 | ! Renamed module and subroutines: lpm_pack_arrays_mod -> lpm_pack_and_sort_mod |
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| 50 | ! lpm_pack_all_arrays -> lpm_sort_in_subboxes, lpm_pack_arrays -> lpm_pack |
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| 51 | ! lpm_sort -> lpm_sort_timeloop_done |
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| 52 | ! |
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| 53 | ! 2318 2017-07-20 17:27:44Z suehring |
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| 54 | ! Get topography top index via Function call |
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| 55 | ! |
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| 56 | ! 2317 2017-07-20 17:27:19Z suehring |
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| 57 | ! |
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| 58 | ! 2232 2017-05-30 17:47:52Z suehring |
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| 59 | ! Adjustments to new topography and surface concept |
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| 60 | ! Rename character range into location, as range is an intrinsic. |
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| 61 | ! |
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| 62 | ! 2000 2016-08-20 18:09:15Z knoop |
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| 63 | ! Forced header and separation lines into 80 columns |
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| 64 | ! |
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| 65 | ! 1929 2016-06-09 16:25:25Z suehring |
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| 66 | ! Rewritten wall reflection |
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| 67 | ! |
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| 68 | ! 1822 2016-04-07 07:49:42Z hoffmann |
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| 69 | ! Tails removed. Unused variables removed. |
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| 70 | ! |
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| 71 | ! 1682 2015-10-07 23:56:08Z knoop |
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| 72 | ! Code annotations made doxygen readable |
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| 73 | ! |
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| 74 | ! 1359 2014-04-11 17:15:14Z hoffmann |
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| 75 | ! New particle structure integrated. |
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| 76 | ! Kind definition added to all floating point numbers. |
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| 77 | ! |
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| 78 | ! 1320 2014-03-20 08:40:49Z raasch |
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| 79 | ! ONLY-attribute added to USE-statements, |
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| 80 | ! kind-parameters added to all INTEGER and REAL declaration statements, |
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| 81 | ! kinds are defined in new module kinds, |
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| 82 | ! revision history before 2012 removed, |
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| 83 | ! comment fields (!:) to be used for variable explanations added to |
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| 84 | ! all variable declaration statements |
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| 85 | ! |
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| 86 | ! 1036 2012-10-22 13:43:42Z raasch |
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| 87 | ! code put under GPL (PALM 3.9) |
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| 88 | ! |
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| 89 | ! 849 2012-03-15 10:35:09Z raasch |
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| 90 | ! routine renamed lpm_boundary_conds, bottom and top boundary conditions |
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| 91 | ! included (former part of advec_particles) |
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| 92 | ! |
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| 93 | ! 824 2012-02-17 09:09:57Z raasch |
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| 94 | ! particle attributes speed_x|y|z_sgs renamed rvar1|2|3 |
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| 95 | ! |
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| 96 | ! Initial version (2007/03/09) |
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| 97 | ! |
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| 98 | ! Description: |
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| 99 | ! ------------ |
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| 100 | !> Boundary conditions for the Lagrangian particles. |
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| 101 | !> The routine consists of two different parts. One handles the bottom (flat) |
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| 102 | !> and top boundary. In this part, also particles which exceeded their lifetime |
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| 103 | !> are deleted. |
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| 104 | !> The other part handles the reflection of particles from vertical walls. |
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| 105 | !> This part was developed by Jin Zhang during 2006-2007. |
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| 106 | !> |
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| 107 | !> To do: Code structure for finding the t_index values and for checking the |
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| 108 | !> ----- reflection conditions is basically the same for all four cases, so it |
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| 109 | !> should be possible to further simplify/shorten it. |
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| 110 | !> |
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| 111 | !> THE WALLS PART OF THIS ROUTINE HAS NOT BEEN TESTED FOR OCEAN RUNS SO FAR!!!! |
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| 112 | !> (see offset_ocean_*) |
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| 113 | !------------------------------------------------------------------------------! |
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| 114 | SUBROUTINE lpm_boundary_conds( location , i, j, k ) |
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| 115 | |
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| 116 | |
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| 117 | USE arrays_3d, & |
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| 118 | ONLY: zu, zw |
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| 119 | |
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| 120 | USE control_parameters, & |
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| 121 | ONLY: dz, message_string, particle_maximum_age |
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| 122 | |
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| 123 | USE cpulog, & |
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| 124 | ONLY: cpu_log, log_point_s |
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| 125 | |
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| 126 | USE grid_variables, & |
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| 127 | ONLY: ddx, dx, ddy, dy |
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| 128 | |
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| 129 | USE indices, & |
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| 130 | ONLY: nxl, nxr, nyn, nys, nz, nzb, wall_flags_0,nyng,nysg |
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| 131 | |
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| 132 | USE kinds |
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| 133 | |
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| 134 | USE particle_attributes, & |
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| 135 | ONLY: deleted_particles, ibc_par_b, ibc_par_t, number_of_particles, & |
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| 136 | particles, particle_type, offset_ocean_nzt_m1, & |
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| 137 | use_sgs_for_particles |
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| 138 | |
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| 139 | USE pegrid |
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| 140 | |
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| 141 | IMPLICIT NONE |
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| 142 | |
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| 143 | CHARACTER (LEN=*) :: location !< |
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| 144 | |
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| 145 | INTEGER(iwp), INTENT(IN) :: i !< |
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| 146 | INTEGER(iwp), INTENT(IN) :: j !< |
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| 147 | INTEGER(iwp), INTENT(IN) :: k !< |
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| 148 | |
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| 149 | INTEGER(iwp) :: inc !< dummy for sorting algorithmus |
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| 150 | INTEGER(iwp) :: ir !< dummy for sorting algorithmus |
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| 151 | INTEGER(iwp) :: i1 !< grid index (x) of old particle position |
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| 152 | INTEGER(iwp) :: i2 !< grid index (x) of current particle position |
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| 153 | INTEGER(iwp) :: i3 !< grid index (x) of intermediate particle position |
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| 154 | INTEGER(iwp) :: jr !< dummy for sorting algorithmus |
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| 155 | INTEGER(iwp) :: j1 !< grid index (y) of old particle position |
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| 156 | INTEGER(iwp) :: j2 !< grid index (y) of current particle position |
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| 157 | INTEGER(iwp) :: j3 !< grid index (y) of intermediate particle position |
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| 158 | INTEGER(iwp) :: k1 !< grid index (z) of old particle position |
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| 159 | INTEGER(iwp) :: k2 !< grid index (z) of current particle position |
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| 160 | INTEGER(iwp) :: k3 !< grid index (z) of intermediate particle position |
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| 161 | INTEGER(iwp) :: n !< particle number |
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| 162 | INTEGER(iwp) :: t_index !< running index for intermediate particle timesteps in reflection algorithmus |
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| 163 | INTEGER(iwp) :: t_index_number !< number of intermediate particle timesteps in reflection algorithmus |
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| 164 | INTEGER(iwp) :: tmp_x !< dummy for sorting algorithm |
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| 165 | INTEGER(iwp) :: tmp_y !< dummy for sorting algorithm |
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| 166 | INTEGER(iwp) :: tmp_z !< dummy for sorting algorithm |
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| 167 | |
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| 168 | INTEGER(iwp), DIMENSION(0:10) :: x_ind(0:10) = 0 !< index array (x) of intermediate particle positions |
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| 169 | INTEGER(iwp), DIMENSION(0:10) :: y_ind(0:10) = 0 !< index array (y) of intermediate particle positions |
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| 170 | INTEGER(iwp), DIMENSION(0:10) :: z_ind(0:10) = 0 !< index array (z) of intermediate particle positions |
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| 171 | |
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| 172 | LOGICAL :: cross_wall_x !< flag to check if particle reflection along x is necessary |
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| 173 | LOGICAL :: cross_wall_y !< flag to check if particle reflection along y is necessary |
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| 174 | LOGICAL :: cross_wall_z !< flag to check if particle reflection along z is necessary |
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| 175 | LOGICAL :: reflect_x !< flag to check if particle is already reflected along x |
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| 176 | LOGICAL :: reflect_y !< flag to check if particle is already reflected along y |
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| 177 | LOGICAL :: reflect_z !< flag to check if particle is already reflected along z |
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| 178 | LOGICAL :: tmp_reach_x !< dummy for sorting algorithmus |
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| 179 | LOGICAL :: tmp_reach_y !< dummy for sorting algorithmus |
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| 180 | LOGICAL :: tmp_reach_z !< dummy for sorting algorithmus |
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| 181 | LOGICAL :: x_wall_reached !< flag to check if particle has already reached wall |
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| 182 | LOGICAL :: y_wall_reached !< flag to check if particle has already reached wall |
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| 183 | LOGICAL :: z_wall_reached !< flag to check if particle has already reached wall |
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| 184 | |
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| 185 | LOGICAL, DIMENSION(0:10) :: reach_x !< flag to check if particle is at a yz-wall |
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| 186 | LOGICAL, DIMENSION(0:10) :: reach_y !< flag to check if particle is at a xz-wall |
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| 187 | LOGICAL, DIMENSION(0:10) :: reach_z !< flag to check if particle is at a xy-wall |
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| 188 | |
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| 189 | REAL(wp) :: dt_particle !< particle timestep |
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| 190 | REAL(wp) :: dum !< dummy argument |
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| 191 | REAL(wp) :: eps = 1E-10_wp !< security number to check if particle has reached a wall |
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| 192 | REAL(wp) :: pos_x !< intermediate particle position (x) |
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| 193 | REAL(wp) :: pos_x_old !< particle position (x) at previous particle timestep |
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| 194 | REAL(wp) :: pos_y !< intermediate particle position (y) |
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| 195 | REAL(wp) :: pos_y_old !< particle position (y) at previous particle timestep |
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| 196 | REAL(wp) :: pos_z !< intermediate particle position (z) |
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| 197 | REAL(wp) :: pos_z_old !< particle position (z) at previous particle timestep |
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| 198 | REAL(wp) :: prt_x !< current particle position (x) |
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| 199 | REAL(wp) :: prt_y !< current particle position (y) |
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| 200 | REAL(wp) :: prt_z !< current particle position (z) |
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| 201 | REAL(wp) :: t_old !< previous reflection time |
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| 202 | REAL(wp) :: tmp_t !< dummy for sorting algorithmus |
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| 203 | REAL(wp) :: xwall !< location of wall in x |
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| 204 | REAL(wp) :: ywall !< location of wall in y |
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| 205 | REAL(wp) :: zwall !< location of wall in z |
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| 206 | |
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| 207 | REAL(wp), DIMENSION(0:10) :: t !< reflection time |
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| 208 | |
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| 209 | |
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| 210 | IF ( location == 'bottom/top' ) THEN |
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| 211 | |
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| 212 | ! |
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| 213 | !-- Apply boundary conditions to those particles that have crossed the top or |
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| 214 | !-- bottom boundary and delete those particles, which are older than allowed |
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| 215 | DO n = 1, number_of_particles |
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| 216 | |
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| 217 | ! |
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| 218 | !-- Stop if particles have moved further than the length of one |
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| 219 | !-- PE subdomain (newly released particles have age = age_m!) |
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| 220 | IF ( particles(n)%age /= particles(n)%age_m ) THEN |
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| 221 | IF ( ABS(particles(n)%speed_x) > & |
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| 222 | ((nxr-nxl+2)*dx)/(particles(n)%age-particles(n)%age_m) .OR. & |
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| 223 | ABS(particles(n)%speed_y) > & |
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| 224 | ((nyn-nys+2)*dy)/(particles(n)%age-particles(n)%age_m) ) THEN |
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| 225 | |
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| 226 | WRITE( message_string, * ) 'particle too fast. n = ', n |
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| 227 | CALL message( 'lpm_boundary_conds', 'PA0148', 2, 2, -1, 6, 1 ) |
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| 228 | ENDIF |
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| 229 | ENDIF |
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| 230 | |
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| 231 | IF ( particles(n)%age > particle_maximum_age .AND. & |
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| 232 | particles(n)%particle_mask ) & |
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| 233 | THEN |
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| 234 | particles(n)%particle_mask = .FALSE. |
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| 235 | deleted_particles = deleted_particles + 1 |
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| 236 | ENDIF |
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| 237 | |
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| 238 | IF ( particles(n)%z >= zw(nz) .AND. particles(n)%particle_mask ) THEN |
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| 239 | IF ( ibc_par_t == 1 ) THEN |
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| 240 | ! |
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| 241 | !-- Particle absorption |
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| 242 | particles(n)%particle_mask = .FALSE. |
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| 243 | deleted_particles = deleted_particles + 1 |
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| 244 | ELSEIF ( ibc_par_t == 2 ) THEN |
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| 245 | ! |
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| 246 | !-- Particle reflection |
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| 247 | particles(n)%z = 2.0_wp * zw(nz) - particles(n)%z |
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| 248 | particles(n)%speed_z = -particles(n)%speed_z |
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| 249 | IF ( use_sgs_for_particles .AND. & |
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| 250 | particles(n)%rvar3 > 0.0_wp ) THEN |
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| 251 | particles(n)%rvar3 = -particles(n)%rvar3 |
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| 252 | ENDIF |
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| 253 | ENDIF |
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| 254 | ENDIF |
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| 255 | |
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| 256 | IF ( particles(n)%z < zw(0) .AND. particles(n)%particle_mask ) THEN |
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| 257 | IF ( ibc_par_b == 1 ) THEN |
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| 258 | ! |
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| 259 | !-- Particle absorption |
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| 260 | particles(n)%particle_mask = .FALSE. |
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| 261 | deleted_particles = deleted_particles + 1 |
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| 262 | ELSEIF ( ibc_par_b == 2 ) THEN |
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| 263 | ! |
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| 264 | !-- Particle reflection |
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| 265 | particles(n)%z = 2.0_wp * zw(0) - particles(n)%z |
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| 266 | particles(n)%speed_z = -particles(n)%speed_z |
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| 267 | IF ( use_sgs_for_particles .AND. & |
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| 268 | particles(n)%rvar3 < 0.0_wp ) THEN |
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| 269 | particles(n)%rvar3 = -particles(n)%rvar3 |
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| 270 | ENDIF |
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| 271 | ENDIF |
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| 272 | ENDIF |
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| 273 | ENDDO |
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| 274 | |
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| 275 | ELSEIF ( location == 'walls' ) THEN |
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| 276 | |
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| 277 | |
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| 278 | CALL cpu_log( log_point_s(48), 'lpm_wall_reflect', 'start' ) |
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| 279 | |
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| 280 | DO n = 1, number_of_particles |
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| 281 | ! |
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| 282 | !-- Recalculate particle timestep |
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| 283 | dt_particle = particles(n)%age - particles(n)%age_m |
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| 284 | ! |
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| 285 | !-- Obtain x/y indices for current particle position |
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| 286 | i2 = particles(n)%x * ddx |
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| 287 | j2 = particles(n)%y * ddy |
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| 288 | IF (zw(k) < particles(n)%z ) k2 = k + 1 |
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| 289 | IF (zw(k-1) > particles(n)%z ) k2 = k - 1 |
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| 290 | ! |
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| 291 | !-- Save current particle positions |
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| 292 | prt_x = particles(n)%x |
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| 293 | prt_y = particles(n)%y |
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| 294 | prt_z = particles(n)%z |
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| 295 | ! |
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| 296 | !-- Recalculate old particle positions |
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| 297 | pos_x_old = particles(n)%x - particles(n)%speed_x * dt_particle |
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| 298 | pos_y_old = particles(n)%y - particles(n)%speed_y * dt_particle |
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| 299 | pos_z_old = particles(n)%z - particles(n)%speed_z * dt_particle |
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| 300 | ! |
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| 301 | !-- Obtain x/y indices for old particle positions |
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| 302 | i1 = i |
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| 303 | j1 = j |
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| 304 | k1 = k |
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| 305 | ! |
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| 306 | !-- Determine horizontal as well as vertical walls at which particle can |
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| 307 | !-- be potentially reflected. |
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| 308 | !-- Start with walls aligned in yz layer. |
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| 309 | !-- Wall to the right |
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| 310 | IF ( prt_x > pos_x_old ) THEN |
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| 311 | xwall = ( i1 + 1 ) * dx |
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| 312 | ! |
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| 313 | !-- Wall to the left |
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| 314 | ELSE |
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| 315 | xwall = i1 * dx |
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| 316 | ENDIF |
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| 317 | ! |
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| 318 | !-- Walls aligned in xz layer |
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| 319 | !-- Wall to the north |
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| 320 | IF ( prt_y > pos_y_old ) THEN |
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| 321 | ywall = ( j1 +1 ) * dy |
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| 322 | !-- Wall to the south |
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| 323 | ELSE |
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| 324 | ywall = j1 * dy |
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| 325 | ENDIF |
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| 326 | |
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| 327 | IF ( prt_z > pos_z_old ) THEN |
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| 328 | zwall = zw(k) |
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| 329 | ELSE |
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| 330 | zwall = zw(k-1) |
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| 331 | ENDIF |
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| 332 | ! |
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| 333 | !-- Initialize flags to check if particle reflection is necessary |
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| 334 | cross_wall_x = .FALSE. |
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| 335 | cross_wall_y = .FALSE. |
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| 336 | cross_wall_z = .FALSE. |
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| 337 | ! |
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| 338 | !-- Initialize flags to check if a wall is reached |
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| 339 | reach_x = .FALSE. |
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| 340 | reach_y = .FALSE. |
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| 341 | reach_z = .FALSE. |
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| 342 | ! |
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| 343 | !-- Initialize flags to check if a particle was already reflected |
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| 344 | reflect_x = .FALSE. |
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| 345 | reflect_y = .FALSE. |
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| 346 | reflect_z = .FALSE. |
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| 347 | ! |
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| 348 | !-- Initialize flags to check if a wall is already crossed. |
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| 349 | !-- ( Required to obtain correct indices. ) |
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| 350 | x_wall_reached = .FALSE. |
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| 351 | y_wall_reached = .FALSE. |
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| 352 | z_wall_reached = .FALSE. |
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| 353 | ! |
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| 354 | !-- Initialize time array |
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| 355 | t = 0.0_wp |
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| 356 | ! |
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| 357 | !-- Check if particle can reach any wall. This case, calculate the |
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| 358 | !-- fractional time needed to reach this wall. Store this fractional |
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| 359 | !-- timestep in array t. Moreover, store indices for these grid |
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| 360 | !-- boxes where the respective wall belongs to. |
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| 361 | !-- Start with x-direction. |
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| 362 | t_index = 1 |
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| 363 | t(t_index) = ( xwall - pos_x_old ) & |
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| 364 | / MERGE( MAX( prt_x - pos_x_old, 1E-30_wp ), & |
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| 365 | MIN( prt_x - pos_x_old, -1E-30_wp ), & |
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| 366 | prt_x > pos_x_old ) |
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| 367 | x_ind(t_index) = i2 |
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| 368 | y_ind(t_index) = j1 |
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| 369 | z_ind(t_index) = k1 |
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| 370 | reach_x(t_index) = .TRUE. |
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| 371 | reach_y(t_index) = .FALSE. |
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| 372 | reach_z(t_index) = .FALSE. |
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| 373 | ! |
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| 374 | !-- Store these values only if particle really reaches any wall. t must |
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| 375 | !-- be in a interval between [0:1]. |
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| 376 | IF ( t(t_index) <= 1.0_wp .AND. t(t_index) >= 0.0_wp ) THEN |
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| 377 | t_index = t_index + 1 |
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| 378 | cross_wall_x = .TRUE. |
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| 379 | ENDIF |
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| 380 | ! |
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| 381 | !-- y-direction |
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| 382 | t(t_index) = ( ywall - pos_y_old ) & |
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| 383 | / MERGE( MAX( prt_y - pos_y_old, 1E-30_wp ), & |
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| 384 | MIN( prt_y - pos_y_old, -1E-30_wp ), & |
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| 385 | prt_y > pos_y_old ) |
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| 386 | x_ind(t_index) = i1 |
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| 387 | y_ind(t_index) = j2 |
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| 388 | z_ind(t_index) = k1 |
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| 389 | reach_x(t_index) = .FALSE. |
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| 390 | reach_y(t_index) = .TRUE. |
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| 391 | reach_z(t_index) = .FALSE. |
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| 392 | IF ( t(t_index) <= 1.0_wp .AND. t(t_index) >= 0.0_wp ) THEN |
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| 393 | t_index = t_index + 1 |
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| 394 | cross_wall_y = .TRUE. |
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| 395 | ENDIF |
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| 396 | ! |
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| 397 | !-- z-direction |
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| 398 | t(t_index) = (zwall - pos_z_old ) & |
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| 399 | / MERGE( MAX( prt_z - pos_z_old, 1E-30_wp ), & |
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| 400 | MIN( prt_z - pos_z_old, -1E-30_wp ), & |
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| 401 | prt_z > pos_z_old ) |
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| 402 | |
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| 403 | x_ind(t_index) = i1 |
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| 404 | y_ind(t_index) = j1 |
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| 405 | z_ind(t_index) = k2 |
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| 406 | reach_x(t_index) = .FALSE. |
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| 407 | reach_y(t_index) = .FALSE. |
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| 408 | reach_z(t_index) = .TRUE. |
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| 409 | IF( t(t_index) <= 1.0_wp .AND. t(t_index) >= 0.0_wp) THEN |
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| 410 | t_index = t_index + 1 |
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| 411 | cross_wall_z = .TRUE. |
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| 412 | ENDIF |
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| 413 | |
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| 414 | t_index_number = t_index - 1 |
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| 415 | ! |
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| 416 | !-- Carry out reflection only if particle reaches any wall |
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| 417 | IF ( cross_wall_x .OR. cross_wall_y .OR. cross_wall_z ) THEN |
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| 418 | ! |
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| 419 | !-- Sort fractional timesteps in ascending order. Also sort the |
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| 420 | !-- corresponding indices and flag according to the time interval a |
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| 421 | !-- particle reaches the respective wall. |
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| 422 | inc = 1 |
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| 423 | jr = 1 |
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| 424 | DO WHILE ( inc <= t_index_number ) |
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| 425 | inc = 3 * inc + 1 |
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| 426 | ENDDO |
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| 427 | |
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| 428 | DO WHILE ( inc > 1 ) |
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| 429 | inc = inc / 3 |
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| 430 | DO ir = inc+1, t_index_number |
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| 431 | tmp_t = t(ir) |
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| 432 | tmp_x = x_ind(ir) |
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| 433 | tmp_y = y_ind(ir) |
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| 434 | tmp_z = z_ind(ir) |
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| 435 | tmp_reach_x = reach_x(ir) |
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| 436 | tmp_reach_y = reach_y(ir) |
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| 437 | tmp_reach_z = reach_z(ir) |
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| 438 | jr = ir |
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| 439 | DO WHILE ( t(jr-inc) > tmp_t ) |
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| 440 | t(jr) = t(jr-inc) |
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| 441 | x_ind(jr) = x_ind(jr-inc) |
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| 442 | y_ind(jr) = y_ind(jr-inc) |
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| 443 | z_ind(jr) = z_ind(jr-inc) |
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| 444 | reach_x(jr) = reach_x(jr-inc) |
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| 445 | reach_y(jr) = reach_y(jr-inc) |
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| 446 | reach_z(jr) = reach_z(jr-inc) |
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| 447 | jr = jr - inc |
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| 448 | IF ( jr <= inc ) EXIT |
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| 449 | ENDDO |
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| 450 | t(jr) = tmp_t |
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| 451 | x_ind(jr) = tmp_x |
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| 452 | y_ind(jr) = tmp_y |
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| 453 | z_ind(jr) = tmp_z |
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| 454 | reach_x(jr) = tmp_reach_x |
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| 455 | reach_y(jr) = tmp_reach_y |
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| 456 | reach_z(jr) = tmp_reach_z |
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| 457 | ENDDO |
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| 458 | ENDDO |
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| 459 | ! |
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| 460 | !-- Initialize temporary particle positions |
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| 461 | pos_x = pos_x_old |
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| 462 | pos_y = pos_y_old |
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| 463 | pos_z = pos_z_old |
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| 464 | ! |
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| 465 | !-- Loop over all times a particle possibly moves into a new grid box |
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| 466 | t_old = 0.0_wp |
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| 467 | DO t_index = 1, t_index_number |
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| 468 | ! |
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| 469 | !-- Calculate intermediate particle position according to the |
|---|
| 470 | !-- timesteps a particle reaches any wall. |
|---|
| 471 | pos_x = pos_x + ( t(t_index) - t_old ) * dt_particle & |
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| 472 | * particles(n)%speed_x |
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| 473 | pos_y = pos_y + ( t(t_index) - t_old ) * dt_particle & |
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| 474 | * particles(n)%speed_y |
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| 475 | pos_z = pos_z + ( t(t_index) - t_old ) * dt_particle & |
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| 476 | * particles(n)%speed_z |
|---|
| 477 | ! |
|---|
| 478 | !-- Obtain x/y grid indices for intermediate particle position from |
|---|
| 479 | !-- sorted index array |
|---|
| 480 | i3 = x_ind(t_index) |
|---|
| 481 | j3 = y_ind(t_index) |
|---|
| 482 | k3 = z_ind(t_index) |
|---|
| 483 | ! |
|---|
| 484 | !-- Check which wall is already reached |
|---|
| 485 | IF ( .NOT. x_wall_reached ) x_wall_reached = reach_x(t_index) |
|---|
| 486 | IF ( .NOT. y_wall_reached ) y_wall_reached = reach_y(t_index) |
|---|
| 487 | IF ( .NOT. z_wall_reached ) z_wall_reached = reach_z(t_index) |
|---|
| 488 | ! |
|---|
| 489 | !-- Check if a particle needs to be reflected at any yz-wall. If |
|---|
| 490 | !-- necessary, carry out reflection. Please note, a security |
|---|
| 491 | !-- constant is required, as the particle position does not |
|---|
| 492 | !-- necessarily exactly match the wall location due to rounding |
|---|
| 493 | !-- errors. |
|---|
| 494 | IF ( reach_x(t_index) .AND. & |
|---|
| 495 | ABS( pos_x - xwall ) < eps .AND. & |
|---|
| 496 | .NOT. BTEST(wall_flags_0(k3,j3,i3),0) .AND. & |
|---|
| 497 | .NOT. reflect_x ) THEN |
|---|
| 498 | ! |
|---|
| 499 | ! |
|---|
| 500 | !-- Reflection in x-direction. |
|---|
| 501 | !-- Ensure correct reflection by MIN/MAX functions, depending on |
|---|
| 502 | !-- direction of particle transport. |
|---|
| 503 | !-- Due to rounding errors pos_x does not exactly match the wall |
|---|
| 504 | !-- location, leading to erroneous reflection. |
|---|
| 505 | pos_x = MERGE( MIN( 2.0_wp * xwall - pos_x, xwall ), & |
|---|
| 506 | MAX( 2.0_wp * xwall - pos_x, xwall ), & |
|---|
| 507 | particles(n)%x > xwall ) |
|---|
| 508 | ! |
|---|
| 509 | !-- Change sign of particle speed |
|---|
| 510 | particles(n)%speed_x = - particles(n)%speed_x |
|---|
| 511 | ! |
|---|
| 512 | !-- Also change sign of subgrid-scale particle speed |
|---|
| 513 | particles(n)%rvar1 = - particles(n)%rvar1 |
|---|
| 514 | ! |
|---|
| 515 | !-- Set flag that reflection along x is already done |
|---|
| 516 | reflect_x = .TRUE. |
|---|
| 517 | ! |
|---|
| 518 | !-- As the particle does not cross any further yz-wall during |
|---|
| 519 | !-- this timestep, set further x-indices to the current one. |
|---|
| 520 | x_ind(t_index:t_index_number) = i1 |
|---|
| 521 | ! |
|---|
| 522 | !-- If particle already reached the wall but was not reflected, |
|---|
| 523 | !-- set further x-indices to the new one. |
|---|
| 524 | ELSEIF ( x_wall_reached .AND. .NOT. reflect_x ) THEN |
|---|
| 525 | x_ind(t_index:t_index_number) = i2 |
|---|
| 526 | ENDIF !particle reflection in x direction done |
|---|
| 527 | |
|---|
| 528 | ! |
|---|
| 529 | !-- Check if a particle needs to be reflected at any xz-wall. If |
|---|
| 530 | !-- necessary, carry out reflection. Please note, a security |
|---|
| 531 | !-- constant is required, as the particle position does not |
|---|
| 532 | !-- necessarily exactly match the wall location due to rounding |
|---|
| 533 | !-- errors. |
|---|
| 534 | IF ( reach_y(t_index) .AND. & |
|---|
| 535 | ABS( pos_y - ywall ) < eps .AND. & |
|---|
| 536 | .NOT. BTEST(wall_flags_0(k3,j3,i3),0) .AND. & |
|---|
| 537 | .NOT. reflect_y ) THEN |
|---|
| 538 | ! |
|---|
| 539 | ! |
|---|
| 540 | !-- Reflection in y-direction. |
|---|
| 541 | !-- Ensure correct reflection by MIN/MAX functions, depending on |
|---|
| 542 | !-- direction of particle transport. |
|---|
| 543 | !-- Due to rounding errors pos_y does not exactly match the wall |
|---|
| 544 | !-- location, leading to erroneous reflection. |
|---|
| 545 | pos_y = MERGE( MIN( 2.0_wp * ywall - pos_y, ywall ), & |
|---|
| 546 | MAX( 2.0_wp * ywall - pos_y, ywall ), & |
|---|
| 547 | particles(n)%y > ywall ) |
|---|
| 548 | ! |
|---|
| 549 | !-- Change sign of particle speed |
|---|
| 550 | particles(n)%speed_y = - particles(n)%speed_y |
|---|
| 551 | ! |
|---|
| 552 | !-- Also change sign of subgrid-scale particle speed |
|---|
| 553 | particles(n)%rvar2 = - particles(n)%rvar2 |
|---|
| 554 | ! |
|---|
| 555 | !-- Set flag that reflection along y is already done |
|---|
| 556 | reflect_y = .TRUE. |
|---|
| 557 | ! |
|---|
| 558 | !-- As the particle does not cross any further xz-wall during |
|---|
| 559 | !-- this timestep, set further y-indices to the current one. |
|---|
| 560 | y_ind(t_index:t_index_number) = j1 |
|---|
| 561 | ! |
|---|
| 562 | !-- If particle already reached the wall but was not reflected, |
|---|
| 563 | !-- set further y-indices to the new one. |
|---|
| 564 | ELSEIF ( y_wall_reached .AND. .NOT. reflect_y ) THEN |
|---|
| 565 | y_ind(t_index:t_index_number) = j2 |
|---|
| 566 | ENDIF !particle reflection in y direction done |
|---|
| 567 | |
|---|
| 568 | ! |
|---|
| 569 | !-- Check if a particle needs to be reflected at any xy-wall. If |
|---|
| 570 | !-- necessary, carry out reflection. Please note, a security |
|---|
| 571 | !-- constant is required, as the particle position does not |
|---|
| 572 | !-- necessarily exactly match the wall location due to rounding |
|---|
| 573 | !-- errors. |
|---|
| 574 | IF ( reach_z(t_index) .AND. & |
|---|
| 575 | ABS( pos_z - zwall ) < eps .AND. & |
|---|
| 576 | .NOT. BTEST(wall_flags_0(k3,j3,i3),0) .AND. & |
|---|
| 577 | .NOT. reflect_z ) THEN |
|---|
| 578 | ! |
|---|
| 579 | ! |
|---|
| 580 | !-- Reflection in z-direction. |
|---|
| 581 | !-- Ensure correct reflection by MIN/MAX functions, depending on |
|---|
| 582 | !-- direction of particle transport. |
|---|
| 583 | !-- Due to rounding errors pos_z does not exactly match the wall |
|---|
| 584 | !-- location, leading to erroneous reflection. |
|---|
| 585 | pos_z = MERGE( MIN( 2.0_wp * zwall - pos_z, zwall ), & |
|---|
| 586 | MAX( 2.0_wp * zwall - pos_z, zwall ), & |
|---|
| 587 | particles(n)%z > zwall ) |
|---|
| 588 | ! |
|---|
| 589 | !-- Change sign of particle speed |
|---|
| 590 | particles(n)%speed_z = - particles(n)%speed_z |
|---|
| 591 | ! |
|---|
| 592 | !-- Also change sign of subgrid-scale particle speed |
|---|
| 593 | particles(n)%rvar3 = - particles(n)%rvar3 |
|---|
| 594 | ! |
|---|
| 595 | !-- Set flag that reflection along z is already done |
|---|
| 596 | reflect_z = .TRUE. |
|---|
| 597 | ! |
|---|
| 598 | !-- As the particle does not cross any further xy-wall during |
|---|
| 599 | !-- this timestep, set further z-indices to the current one. |
|---|
| 600 | z_ind(t_index:t_index_number) = k1 |
|---|
| 601 | ! |
|---|
| 602 | !-- If particle already reached the wall but was not reflected, |
|---|
| 603 | !-- set further z-indices to the new one. |
|---|
| 604 | ELSEIF ( z_wall_reached .AND. .NOT. reflect_z ) THEN |
|---|
| 605 | z_ind(t_index:t_index_number) = k2 |
|---|
| 606 | ENDIF !particle reflection in z direction done |
|---|
| 607 | |
|---|
| 608 | ! |
|---|
| 609 | !-- Swap time |
|---|
| 610 | t_old = t(t_index) |
|---|
| 611 | |
|---|
| 612 | ENDDO |
|---|
| 613 | ! |
|---|
| 614 | !-- If a particle was reflected, calculate final position from last |
|---|
| 615 | !-- intermediate position. |
|---|
| 616 | IF ( reflect_x .OR. reflect_y .OR. reflect_z ) THEN |
|---|
| 617 | |
|---|
| 618 | particles(n)%x = pos_x + ( 1.0_wp - t_old ) * dt_particle & |
|---|
| 619 | * particles(n)%speed_x |
|---|
| 620 | particles(n)%y = pos_y + ( 1.0_wp - t_old ) * dt_particle & |
|---|
| 621 | * particles(n)%speed_y |
|---|
| 622 | particles(n)%z = pos_z + ( 1.0_wp - t_old ) * dt_particle & |
|---|
| 623 | * particles(n)%speed_z |
|---|
| 624 | |
|---|
| 625 | ENDIF |
|---|
| 626 | |
|---|
| 627 | ENDIF |
|---|
| 628 | |
|---|
| 629 | ENDDO |
|---|
| 630 | |
|---|
| 631 | CALL cpu_log( log_point_s(48), 'lpm_wall_reflect', 'stop' ) |
|---|
| 632 | |
|---|
| 633 | ENDIF |
|---|
| 634 | |
|---|
| 635 | END SUBROUTINE lpm_boundary_conds |
|---|
