[1682] | 1 | !> @file lpm_boundary_conds.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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[2101] | 17 | ! Copyright 1997-2017 Leibniz Universitaet Hannover |
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[2000] | 18 | !------------------------------------------------------------------------------! |
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[1036] | 19 | ! |
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[484] | 20 | ! Current revisions: |
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[58] | 21 | ! ----------------- |
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[1360] | 22 | ! |
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[2233] | 23 | ! |
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[1321] | 24 | ! Former revisions: |
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| 25 | ! ----------------- |
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| 26 | ! $Id: lpm_boundary_conds.f90 2233 2017-05-30 18:08:54Z witha $ |
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| 27 | ! |
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[2233] | 28 | ! 2232 2017-05-30 17:47:52Z suehring |
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| 29 | ! Adjustments to new topography and surface concept |
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| 30 | ! Rename character range into location, as range is an intrinsic. |
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| 31 | ! |
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[2001] | 32 | ! 2000 2016-08-20 18:09:15Z knoop |
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| 33 | ! Forced header and separation lines into 80 columns |
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| 34 | ! |
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[1930] | 35 | ! 1929 2016-06-09 16:25:25Z suehring |
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| 36 | ! Rewritten wall reflection |
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| 37 | ! |
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[1823] | 38 | ! 1822 2016-04-07 07:49:42Z hoffmann |
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| 39 | ! Tails removed. Unused variables removed. |
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| 40 | ! |
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[1683] | 41 | ! 1682 2015-10-07 23:56:08Z knoop |
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| 42 | ! Code annotations made doxygen readable |
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| 43 | ! |
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[1360] | 44 | ! 1359 2014-04-11 17:15:14Z hoffmann |
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| 45 | ! New particle structure integrated. |
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| 46 | ! Kind definition added to all floating point numbers. |
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| 47 | ! |
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[1321] | 48 | ! 1320 2014-03-20 08:40:49Z raasch |
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[1320] | 49 | ! ONLY-attribute added to USE-statements, |
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| 50 | ! kind-parameters added to all INTEGER and REAL declaration statements, |
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| 51 | ! kinds are defined in new module kinds, |
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| 52 | ! revision history before 2012 removed, |
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| 53 | ! comment fields (!:) to be used for variable explanations added to |
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| 54 | ! all variable declaration statements |
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[58] | 55 | ! |
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[1037] | 56 | ! 1036 2012-10-22 13:43:42Z raasch |
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| 57 | ! code put under GPL (PALM 3.9) |
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| 58 | ! |
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[850] | 59 | ! 849 2012-03-15 10:35:09Z raasch |
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| 60 | ! routine renamed lpm_boundary_conds, bottom and top boundary conditions |
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| 61 | ! included (former part of advec_particles) |
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| 62 | ! |
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[826] | 63 | ! 824 2012-02-17 09:09:57Z raasch |
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| 64 | ! particle attributes speed_x|y|z_sgs renamed rvar1|2|3 |
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| 65 | ! |
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[58] | 66 | ! Initial version (2007/03/09) |
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| 67 | ! |
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| 68 | ! Description: |
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| 69 | ! ------------ |
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[1682] | 70 | !> Boundary conditions for the Lagrangian particles. |
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| 71 | !> The routine consists of two different parts. One handles the bottom (flat) |
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| 72 | !> and top boundary. In this part, also particles which exceeded their lifetime |
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| 73 | !> are deleted. |
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| 74 | !> The other part handles the reflection of particles from vertical walls. |
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| 75 | !> This part was developed by Jin Zhang during 2006-2007. |
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| 76 | !> |
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| 77 | !> To do: Code structure for finding the t_index values and for checking the |
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| 78 | !> ----- reflection conditions is basically the same for all four cases, so it |
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| 79 | !> should be possible to further simplify/shorten it. |
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| 80 | !> |
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| 81 | !> THE WALLS PART OF THIS ROUTINE HAS NOT BEEN TESTED FOR OCEAN RUNS SO FAR!!!! |
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| 82 | !> (see offset_ocean_*) |
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[58] | 83 | !------------------------------------------------------------------------------! |
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[2232] | 84 | SUBROUTINE lpm_boundary_conds( location ) |
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[1682] | 85 | |
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[58] | 86 | |
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[1320] | 87 | USE arrays_3d, & |
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| 88 | ONLY: zu, zw |
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[58] | 89 | |
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[1320] | 90 | USE control_parameters, & |
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[1822] | 91 | ONLY: dz, message_string, particle_maximum_age |
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[58] | 92 | |
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[1320] | 93 | USE cpulog, & |
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| 94 | ONLY: cpu_log, log_point_s |
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[849] | 95 | |
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[1320] | 96 | USE grid_variables, & |
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| 97 | ONLY: ddx, dx, ddy, dy |
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[58] | 98 | |
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[1320] | 99 | USE indices, & |
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[2232] | 100 | ONLY: nxl, nxr, nyn, nys, nz, nzb, nzb_max, wall_flags_0 |
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[61] | 101 | |
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[1320] | 102 | USE kinds |
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[58] | 103 | |
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[1320] | 104 | USE particle_attributes, & |
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[1822] | 105 | ONLY: deleted_particles, ibc_par_b, ibc_par_t, number_of_particles, & |
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| 106 | particles, particle_type, offset_ocean_nzt_m1, & |
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| 107 | use_sgs_for_particles |
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[60] | 108 | |
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[1320] | 109 | USE pegrid |
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[58] | 110 | |
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[1320] | 111 | IMPLICIT NONE |
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[58] | 112 | |
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[2232] | 113 | CHARACTER (LEN=*) :: location !< |
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[1320] | 114 | |
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[1929] | 115 | INTEGER(iwp) :: inc !< dummy for sorting algorithmus |
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| 116 | INTEGER(iwp) :: ir !< dummy for sorting algorithmus |
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| 117 | INTEGER(iwp) :: i1 !< grid index (x) of old particle position |
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| 118 | INTEGER(iwp) :: i2 !< grid index (x) of current particle position |
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| 119 | INTEGER(iwp) :: i3 !< grid index (x) of intermediate particle position |
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| 120 | INTEGER(iwp) :: jr !< dummy for sorting algorithmus |
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| 121 | INTEGER(iwp) :: j1 !< grid index (y) of old particle position |
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| 122 | INTEGER(iwp) :: j2 !< grid index (x) of current particle position |
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| 123 | INTEGER(iwp) :: j3 !< grid index (x) of intermediate particle position |
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[2232] | 124 | INTEGER(iwp) :: k_wall !< vertical index of topography top |
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[1929] | 125 | INTEGER(iwp) :: n !< particle number |
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| 126 | INTEGER(iwp) :: t_index !< running index for intermediate particle timesteps in reflection algorithmus |
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| 127 | INTEGER(iwp) :: t_index_number !< number of intermediate particle timesteps in reflection algorithmus |
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| 128 | INTEGER(iwp) :: tmp_x !< dummy for sorting algorithmus |
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| 129 | INTEGER(iwp) :: tmp_y !< dummy for sorting algorithmus |
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| 130 | |
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| 131 | INTEGER(iwp), DIMENSION(0:10) :: x_ind(0:10) = 0 !< index array (x) of intermediate particle positions |
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| 132 | INTEGER(iwp), DIMENSION(0:10) :: y_ind(0:10) = 0 !< index array (x) of intermediate particle positions |
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[1320] | 133 | |
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[1929] | 134 | LOGICAL :: cross_wall_x !< flag to check if particle reflection along x is necessary |
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| 135 | LOGICAL :: cross_wall_y !< flag to check if particle reflection along y is necessary |
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| 136 | LOGICAL :: downwards !< flag to check if particle reflection along z is necessary (only if particle move downwards) |
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| 137 | LOGICAL :: reflect_x !< flag to check if particle is already reflected along x |
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| 138 | LOGICAL :: reflect_y !< flag to check if particle is already reflected along y |
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| 139 | LOGICAL :: reflect_z !< flag to check if particle is already reflected along z |
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| 140 | LOGICAL :: tmp_reach_x !< dummy for sorting algorithmus |
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| 141 | LOGICAL :: tmp_reach_y !< dummy for sorting algorithmus |
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| 142 | LOGICAL :: tmp_reach_z !< dummy for sorting algorithmus |
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| 143 | LOGICAL :: x_wall_reached !< flag to check if particle has already reached wall |
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| 144 | LOGICAL :: y_wall_reached !< flag to check if particle has already reached wall |
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[1320] | 145 | |
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[1929] | 146 | LOGICAL, DIMENSION(0:10) :: reach_x !< flag to check if particle is at a yz-wall |
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| 147 | LOGICAL, DIMENSION(0:10) :: reach_y !< flag to check if particle is at a xz-wall |
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| 148 | LOGICAL, DIMENSION(0:10) :: reach_z !< flag to check if particle is at a xy-wall |
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[1320] | 149 | |
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[1929] | 150 | REAL(wp) :: dt_particle !< particle timestep |
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| 151 | REAL(wp) :: dum !< dummy argument |
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| 152 | REAL(wp) :: eps = 1E-10_wp !< security number to check if particle has reached a wall |
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| 153 | REAL(wp) :: pos_x !< intermediate particle position (x) |
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| 154 | REAL(wp) :: pos_x_old !< particle position (x) at previous particle timestep |
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| 155 | REAL(wp) :: pos_y !< intermediate particle position (y) |
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| 156 | REAL(wp) :: pos_y_old !< particle position (y) at previous particle timestep |
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| 157 | REAL(wp) :: pos_z !< intermediate particle position (z) |
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| 158 | REAL(wp) :: pos_z_old !< particle position (z) at previous particle timestep |
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| 159 | REAL(wp) :: prt_x !< current particle position (x) |
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| 160 | REAL(wp) :: prt_y !< current particle position (y) |
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| 161 | REAL(wp) :: prt_z !< current particle position (z) |
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| 162 | REAL(wp) :: t_old !< previous reflection time |
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| 163 | REAL(wp) :: tmp_t !< dummy for sorting algorithmus |
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| 164 | REAL(wp) :: xwall !< location of wall in x |
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| 165 | REAL(wp) :: ywall !< location of wall in y |
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| 166 | REAL(wp) :: zwall1 !< location of wall in z (old grid box) |
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| 167 | REAL(wp) :: zwall2 !< location of wall in z (current grid box) |
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| 168 | REAL(wp) :: zwall3 !< location of wall in z (old y, current x) |
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| 169 | REAL(wp) :: zwall4 !< location of wall in z (current y, old x) |
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| 170 | |
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| 171 | REAL(wp), DIMENSION(0:10) :: t !< reflection time |
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| 172 | |
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| 173 | |
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[2232] | 174 | IF ( location == 'bottom/top' ) THEN |
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[58] | 175 | |
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[849] | 176 | ! |
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| 177 | !-- Apply boundary conditions to those particles that have crossed the top or |
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| 178 | !-- bottom boundary and delete those particles, which are older than allowed |
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| 179 | DO n = 1, number_of_particles |
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[61] | 180 | |
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[849] | 181 | ! |
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| 182 | !-- Stop if particles have moved further than the length of one |
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| 183 | !-- PE subdomain (newly released particles have age = age_m!) |
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| 184 | IF ( particles(n)%age /= particles(n)%age_m ) THEN |
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| 185 | IF ( ABS(particles(n)%speed_x) > & |
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| 186 | ((nxr-nxl+2)*dx)/(particles(n)%age-particles(n)%age_m) .OR. & |
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| 187 | ABS(particles(n)%speed_y) > & |
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| 188 | ((nyn-nys+2)*dy)/(particles(n)%age-particles(n)%age_m) ) THEN |
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[60] | 189 | |
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[849] | 190 | WRITE( message_string, * ) 'particle too fast. n = ', n |
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| 191 | CALL message( 'lpm_boundary_conds', 'PA0148', 2, 2, -1, 6, 1 ) |
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| 192 | ENDIF |
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| 193 | ENDIF |
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[58] | 194 | |
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[849] | 195 | IF ( particles(n)%age > particle_maximum_age .AND. & |
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[1359] | 196 | particles(n)%particle_mask ) & |
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[849] | 197 | THEN |
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[1359] | 198 | particles(n)%particle_mask = .FALSE. |
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[849] | 199 | deleted_particles = deleted_particles + 1 |
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| 200 | ENDIF |
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[58] | 201 | |
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[1359] | 202 | IF ( particles(n)%z >= zu(nz) .AND. particles(n)%particle_mask ) THEN |
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[849] | 203 | IF ( ibc_par_t == 1 ) THEN |
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[61] | 204 | ! |
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[849] | 205 | !-- Particle absorption |
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[1359] | 206 | particles(n)%particle_mask = .FALSE. |
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[849] | 207 | deleted_particles = deleted_particles + 1 |
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| 208 | ELSEIF ( ibc_par_t == 2 ) THEN |
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| 209 | ! |
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| 210 | !-- Particle reflection |
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[1359] | 211 | particles(n)%z = 2.0_wp * zu(nz) - particles(n)%z |
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[849] | 212 | particles(n)%speed_z = -particles(n)%speed_z |
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| 213 | IF ( use_sgs_for_particles .AND. & |
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[1359] | 214 | particles(n)%rvar3 > 0.0_wp ) THEN |
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[849] | 215 | particles(n)%rvar3 = -particles(n)%rvar3 |
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| 216 | ENDIF |
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| 217 | ENDIF |
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| 218 | ENDIF |
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[1359] | 219 | |
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| 220 | IF ( particles(n)%z < zw(0) .AND. particles(n)%particle_mask ) THEN |
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[849] | 221 | IF ( ibc_par_b == 1 ) THEN |
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| 222 | ! |
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| 223 | !-- Particle absorption |
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[1359] | 224 | particles(n)%particle_mask = .FALSE. |
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[849] | 225 | deleted_particles = deleted_particles + 1 |
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| 226 | ELSEIF ( ibc_par_b == 2 ) THEN |
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| 227 | ! |
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| 228 | !-- Particle reflection |
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[1359] | 229 | particles(n)%z = 2.0_wp * zw(0) - particles(n)%z |
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[849] | 230 | particles(n)%speed_z = -particles(n)%speed_z |
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| 231 | IF ( use_sgs_for_particles .AND. & |
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[1359] | 232 | particles(n)%rvar3 < 0.0_wp ) THEN |
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[849] | 233 | particles(n)%rvar3 = -particles(n)%rvar3 |
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| 234 | ENDIF |
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| 235 | ENDIF |
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| 236 | ENDIF |
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| 237 | ENDDO |
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[58] | 238 | |
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[2232] | 239 | ELSEIF ( location == 'walls' ) THEN |
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[58] | 240 | |
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[1929] | 241 | |
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[849] | 242 | CALL cpu_log( log_point_s(48), 'lpm_wall_reflect', 'start' ) |
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| 243 | |
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| 244 | DO n = 1, number_of_particles |
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[1929] | 245 | ! |
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| 246 | !-- Recalculate particle timestep |
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[849] | 247 | dt_particle = particles(n)%age - particles(n)%age_m |
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[1929] | 248 | ! |
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| 249 | !-- Obtain x/y indices for current particle position |
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[1359] | 250 | i2 = ( particles(n)%x + 0.5_wp * dx ) * ddx |
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| 251 | j2 = ( particles(n)%y + 0.5_wp * dy ) * ddy |
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[1929] | 252 | ! |
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| 253 | !-- Save current particle positions |
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[849] | 254 | prt_x = particles(n)%x |
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| 255 | prt_y = particles(n)%y |
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| 256 | prt_z = particles(n)%z |
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[58] | 257 | ! |
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[1929] | 258 | !-- Recalculate old particle positions |
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| 259 | pos_x_old = particles(n)%x - particles(n)%speed_x * dt_particle |
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| 260 | pos_y_old = particles(n)%y - particles(n)%speed_y * dt_particle |
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| 261 | pos_z_old = particles(n)%z - particles(n)%speed_z * dt_particle |
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[849] | 262 | ! |
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[1929] | 263 | !-- Obtain x/y indices for old particle positions |
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| 264 | i1 = ( pos_x_old + 0.5_wp * dx ) * ddx |
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| 265 | j1 = ( pos_y_old + 0.5_wp * dy ) * ddy |
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[58] | 266 | ! |
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[1929] | 267 | !-- Determine horizontal as well as vertical walls at which particle can |
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| 268 | !-- be potentially reflected. |
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| 269 | !-- Start with walls aligned in yz layer. |
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| 270 | !-- Wall to the right |
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| 271 | IF ( prt_x > pos_x_old ) THEN |
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| 272 | xwall = ( i1 + 0.5_wp ) * dx |
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| 273 | ! |
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| 274 | !-- Wall to the left |
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| 275 | ELSE |
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| 276 | xwall = ( i1 - 0.5_wp ) * dx |
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| 277 | ENDIF |
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| 278 | ! |
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| 279 | !-- Walls aligned in xz layer |
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| 280 | !-- Wall to the north |
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| 281 | IF ( prt_y > pos_y_old ) THEN |
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| 282 | ywall = ( j1 + 0.5_wp ) * dy |
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| 283 | !-- Wall to the south |
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| 284 | ELSE |
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| 285 | ywall = ( j1 - 0.5_wp ) * dy |
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| 286 | ENDIF |
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| 287 | ! |
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[2232] | 288 | !-- Walls aligned in xy layer at which particle can be possiblly reflected. |
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| 289 | !-- The construct of MERGE and BTEST is used to determine the topography- |
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| 290 | !-- top index (former nzb_s_inner). |
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| 291 | zwall1 = zw( MAXLOC( & |
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| 292 | MERGE( 1, 0, & |
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| 293 | BTEST( wall_flags_0(nzb:nzb_max,j2,i2), 12 ) & |
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| 294 | ), DIM = 1 & |
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| 295 | ) - 1 ) |
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| 296 | zwall2 = zw( MAXLOC( & |
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| 297 | MERGE( 1, 0, & |
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| 298 | BTEST( wall_flags_0(nzb:nzb_max,j1,i1), 12 ) & |
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| 299 | ), DIM = 1 & |
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| 300 | ) - 1 ) |
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| 301 | zwall3 = zw( MAXLOC( & |
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| 302 | MERGE( 1, 0, & |
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| 303 | BTEST( wall_flags_0(nzb:nzb_max,j1,i2), 12 ) & |
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| 304 | ), DIM = 1 & |
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| 305 | ) - 1 ) |
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| 306 | zwall4 = zw( MAXLOC( & |
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| 307 | MERGE( 1, 0, & |
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| 308 | BTEST( wall_flags_0(nzb:nzb_max,j2,i1), 12 ) & |
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| 309 | ), DIM = 1 & |
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| 310 | ) - 1 ) |
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[1929] | 311 | ! |
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| 312 | !-- Initialize flags to check if particle reflection is necessary |
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| 313 | downwards = .FALSE. |
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| 314 | cross_wall_x = .FALSE. |
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| 315 | cross_wall_y = .FALSE. |
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| 316 | ! |
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| 317 | !-- Initialize flags to check if a wall is reached |
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| 318 | reach_x = .FALSE. |
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| 319 | reach_y = .FALSE. |
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| 320 | reach_z = .FALSE. |
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| 321 | ! |
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| 322 | !-- Initialize flags to check if a particle was already reflected |
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| 323 | reflect_x = .FALSE. |
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| 324 | reflect_y = .FALSE. |
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| 325 | reflect_z = .FALSE. |
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| 326 | ! |
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| 327 | !-- Initialize flags to check if a vertical wall is already crossed. |
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| 328 | !-- ( Required to obtain correct indices. ) |
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| 329 | x_wall_reached = .FALSE. |
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| 330 | y_wall_reached = .FALSE. |
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| 331 | ! |
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| 332 | !-- Initialize time array |
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| 333 | t = 0.0_wp |
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| 334 | ! |
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| 335 | !-- Check if particle can reach any wall. This case, calculate the |
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| 336 | !-- fractional time needed to reach this wall. Store this fractional |
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| 337 | !-- timestep in array t. Moreover, store indices for these grid |
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| 338 | !-- boxes where the respective wall belongs to. |
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| 339 | !-- Start with x-direction. |
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| 340 | t_index = 1 |
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| 341 | t(t_index) = ( xwall - pos_x_old ) & |
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| 342 | / MERGE( MAX( prt_x - pos_x_old, 1E-30_wp ), & |
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| 343 | MIN( prt_x - pos_x_old, -1E-30_wp ), & |
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| 344 | prt_x > pos_x_old ) |
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| 345 | x_ind(t_index) = i2 |
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| 346 | y_ind(t_index) = j1 |
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| 347 | reach_x(t_index) = .TRUE. |
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| 348 | reach_y(t_index) = .FALSE. |
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| 349 | reach_z(t_index) = .FALSE. |
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| 350 | ! |
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| 351 | !-- Store these values only if particle really reaches any wall. t must |
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| 352 | !-- be in a interval between [0:1]. |
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| 353 | IF ( t(t_index) <= 1.0_wp .AND. t(t_index) >= 0.0_wp ) THEN |
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| 354 | t_index = t_index + 1 |
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| 355 | cross_wall_x = .TRUE. |
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| 356 | ENDIF |
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| 357 | ! |
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| 358 | !-- y-direction |
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| 359 | t(t_index) = ( ywall - pos_y_old ) & |
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| 360 | / MERGE( MAX( prt_y - pos_y_old, 1E-30_wp ), & |
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| 361 | MIN( prt_y - pos_y_old, -1E-30_wp ), & |
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| 362 | prt_y > pos_y_old ) |
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| 363 | x_ind(t_index) = i1 |
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| 364 | y_ind(t_index) = j2 |
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| 365 | reach_x(t_index) = .FALSE. |
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| 366 | reach_y(t_index) = .TRUE. |
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| 367 | reach_z(t_index) = .FALSE. |
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| 368 | IF ( t(t_index) <= 1.0_wp .AND. t(t_index) >= 0.0_wp ) THEN |
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| 369 | t_index = t_index + 1 |
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| 370 | cross_wall_y = .TRUE. |
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| 371 | ENDIF |
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| 372 | ! |
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| 373 | !-- z-direction |
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| 374 | !-- At first, check if particle moves downwards. Only in this case a |
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| 375 | !-- particle can be reflected vertically. |
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| 376 | IF ( prt_z < pos_z_old ) THEN |
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[58] | 377 | |
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[1929] | 378 | downwards = .TRUE. |
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| 379 | dum = 1.0_wp / MERGE( MAX( prt_z - pos_z_old, 1E-30_wp ), & |
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| 380 | MIN( prt_z - pos_z_old, -1E-30_wp ), & |
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| 381 | prt_z > pos_z_old ) |
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[58] | 382 | |
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[1929] | 383 | t(t_index) = ( zwall1 - pos_z_old ) * dum |
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| 384 | x_ind(t_index) = i2 |
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| 385 | y_ind(t_index) = j2 |
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| 386 | reach_x(t_index) = .FALSE. |
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| 387 | reach_y(t_index) = .FALSE. |
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| 388 | reach_z(t_index) = .TRUE. |
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| 389 | IF ( t(t_index) <= 1.0_wp .AND. t(t_index) >= 0.0_wp ) & |
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| 390 | t_index = t_index + 1 |
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[58] | 391 | |
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[1929] | 392 | reach_x(t_index) = .FALSE. |
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| 393 | reach_y(t_index) = .FALSE. |
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| 394 | reach_z(t_index) = .TRUE. |
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| 395 | t(t_index) = ( zwall2 - pos_z_old ) * dum |
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| 396 | x_ind(t_index) = i1 |
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| 397 | y_ind(t_index) = j1 |
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| 398 | IF ( t(t_index) <= 1.0_wp .AND. t(t_index) >= 0.0_wp ) & |
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| 399 | t_index = t_index + 1 |
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[58] | 400 | |
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[1929] | 401 | reach_x(t_index) = .FALSE. |
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| 402 | reach_y(t_index) = .FALSE. |
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| 403 | reach_z(t_index) = .TRUE. |
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| 404 | t(t_index) = ( zwall3 - pos_z_old ) * dum |
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| 405 | x_ind(t_index) = i2 |
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| 406 | y_ind(t_index) = j1 |
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| 407 | IF ( t(t_index) <= 1.0_wp .AND. t(t_index) >= 0.0_wp ) & |
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| 408 | t_index = t_index + 1 |
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[58] | 409 | |
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[1929] | 410 | reach_x(t_index) = .FALSE. |
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| 411 | reach_y(t_index) = .FALSE. |
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| 412 | reach_z(t_index) = .TRUE. |
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| 413 | t(t_index) = ( zwall4 - pos_z_old ) * dum |
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| 414 | x_ind(t_index) = i1 |
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| 415 | y_ind(t_index) = j2 |
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| 416 | IF ( t(t_index) <= 1.0_wp .AND. t(t_index) >= 0.0_wp ) & |
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| 417 | t_index = t_index + 1 |
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[58] | 418 | |
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[1929] | 419 | END IF |
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| 420 | t_index_number = t_index - 1 |
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[58] | 421 | ! |
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[1929] | 422 | !-- Carry out reflection only if particle reaches any wall |
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| 423 | IF ( cross_wall_x .OR. cross_wall_y .OR. downwards ) THEN |
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[58] | 424 | ! |
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[1929] | 425 | !-- Sort fractional timesteps in ascending order. Also sort the |
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| 426 | !-- corresponding indices and flag according to the time interval a |
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| 427 | !-- particle reaches the respective wall. |
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| 428 | inc = 1 |
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| 429 | jr = 1 |
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| 430 | DO WHILE ( inc <= t_index_number ) |
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| 431 | inc = 3 * inc + 1 |
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| 432 | ENDDO |
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[58] | 433 | |
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[1929] | 434 | DO WHILE ( inc > 1 ) |
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| 435 | inc = inc / 3 |
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| 436 | DO ir = inc+1, t_index_number |
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| 437 | tmp_t = t(ir) |
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| 438 | tmp_x = x_ind(ir) |
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| 439 | tmp_y = y_ind(ir) |
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| 440 | tmp_reach_x = reach_x(ir) |
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| 441 | tmp_reach_y = reach_y(ir) |
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| 442 | tmp_reach_z = reach_z(ir) |
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| 443 | jr = ir |
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| 444 | DO WHILE ( t(jr-inc) > tmp_t ) |
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| 445 | t(jr) = t(jr-inc) |
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| 446 | x_ind(jr) = x_ind(jr-inc) |
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| 447 | y_ind(jr) = y_ind(jr-inc) |
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| 448 | reach_x(jr) = reach_x(jr-inc) |
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| 449 | reach_y(jr) = reach_y(jr-inc) |
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| 450 | reach_z(jr) = reach_z(jr-inc) |
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| 451 | jr = jr - inc |
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| 452 | IF ( jr <= inc ) EXIT |
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[58] | 453 | ENDDO |
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[1929] | 454 | t(jr) = tmp_t |
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| 455 | x_ind(jr) = tmp_x |
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| 456 | y_ind(jr) = tmp_y |
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| 457 | reach_x(jr) = tmp_reach_x |
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| 458 | reach_y(jr) = tmp_reach_y |
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| 459 | reach_z(jr) = tmp_reach_z |
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[58] | 460 | ENDDO |
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[1929] | 461 | ENDDO |
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[58] | 462 | ! |
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[1929] | 463 | !-- Initialize temporary particle positions |
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| 464 | pos_x = pos_x_old |
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| 465 | pos_y = pos_y_old |
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| 466 | pos_z = pos_z_old |
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| 467 | ! |
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| 468 | !-- Loop over all times a particle possibly moves into a new grid box |
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| 469 | t_old = 0.0_wp |
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| 470 | DO t_index = 1, t_index_number |
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| 471 | ! |
---|
| 472 | !-- Calculate intermediate particle position according to the |
---|
| 473 | !-- timesteps a particle reaches any wall. |
---|
| 474 | pos_x = pos_x + ( t(t_index) - t_old ) * dt_particle & |
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| 475 | * particles(n)%speed_x |
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| 476 | pos_y = pos_y + ( t(t_index) - t_old ) * dt_particle & |
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| 477 | * particles(n)%speed_y |
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| 478 | pos_z = pos_z + ( t(t_index) - t_old ) * dt_particle & |
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| 479 | * particles(n)%speed_z |
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| 480 | ! |
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| 481 | !-- Obtain x/y grid indices for intermediate particle position from |
---|
| 482 | !-- sorted index array |
---|
| 483 | i3 = x_ind(t_index) |
---|
| 484 | j3 = y_ind(t_index) |
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| 485 | ! |
---|
| 486 | !-- Check which wall is already reached |
---|
| 487 | IF ( .NOT. x_wall_reached ) x_wall_reached = reach_x(t_index) |
---|
| 488 | IF ( .NOT. y_wall_reached ) y_wall_reached = reach_y(t_index) |
---|
| 489 | ! |
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| 490 | !-- Check if a particle needs to be reflected at any yz-wall. If |
---|
| 491 | !-- necessary, carry out reflection. Please note, a security |
---|
| 492 | !-- constant is required, as the particle position do not |
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| 493 | !-- necessarily exactly match the wall location due to rounding |
---|
[2232] | 494 | !-- errors. At first, determine index of topography top at (j3,i3) |
---|
| 495 | k_wall = MAXLOC( & |
---|
| 496 | MERGE( 1, 0, & |
---|
| 497 | BTEST( wall_flags_0(nzb:nzb_max,j3,i3), 12 ) & |
---|
| 498 | ), DIM = 1 & |
---|
| 499 | ) - 1 |
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[1929] | 500 | IF ( ABS( pos_x - xwall ) < eps .AND. & |
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[2232] | 501 | pos_z <= zw(k_wall) .AND. & |
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[1929] | 502 | reach_x(t_index) .AND. & |
---|
| 503 | .NOT. reflect_x ) THEN |
---|
| 504 | ! |
---|
| 505 | !-- Reflection in x-direction. |
---|
| 506 | !-- Ensure correct reflection by MIN/MAX functions, depending on |
---|
| 507 | !-- direction of particle transport. |
---|
| 508 | !-- Due to rounding errors pos_x do not exactly matches the wall |
---|
| 509 | !-- location, leading to erroneous reflection. |
---|
| 510 | pos_x = MERGE( MIN( 2.0_wp * xwall - pos_x, xwall ), & |
---|
| 511 | MAX( 2.0_wp * xwall - pos_x, xwall ), & |
---|
| 512 | particles(n)%x > xwall ) |
---|
| 513 | ! |
---|
| 514 | !-- Change sign of particle speed |
---|
| 515 | particles(n)%speed_x = - particles(n)%speed_x |
---|
| 516 | ! |
---|
| 517 | !-- Change also sign of subgrid-scale particle speed |
---|
| 518 | particles(n)%rvar1 = - particles(n)%rvar1 |
---|
| 519 | ! |
---|
| 520 | !-- Set flag that reflection along x is already done |
---|
| 521 | reflect_x = .TRUE. |
---|
| 522 | ! |
---|
| 523 | !-- As particle do not crosses any further yz-wall during |
---|
| 524 | !-- this timestep, set further x-indices to the current one. |
---|
| 525 | x_ind(t_index:t_index_number) = i1 |
---|
| 526 | ! |
---|
| 527 | !-- If particle already reached the wall but was not reflected, |
---|
| 528 | !-- set further x-indices to the new one. |
---|
| 529 | ELSEIF ( x_wall_reached .AND. .NOT. reflect_x ) THEN |
---|
| 530 | x_ind(t_index:t_index_number) = i2 |
---|
| 531 | ENDIF |
---|
| 532 | ! |
---|
| 533 | !-- Check if a particle needs to be reflected at any xz-wall. If |
---|
[2232] | 534 | !-- necessary, carry out reflection. At first, determine index of |
---|
| 535 | !-- topography top at (j3,i3) |
---|
| 536 | k_wall = MAXLOC( & |
---|
| 537 | MERGE( 1, 0, & |
---|
| 538 | BTEST( wall_flags_0(nzb:nzb_max,j3,i3), 12 ) & |
---|
| 539 | ), DIM = 1 & |
---|
| 540 | ) - 1 |
---|
[1929] | 541 | IF ( ABS( pos_y - ywall ) < eps .AND. & |
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[2232] | 542 | pos_z <= zw(k_wall) .AND. & |
---|
[1929] | 543 | reach_y(t_index) .AND. & |
---|
| 544 | .NOT. reflect_y ) THEN |
---|
[61] | 545 | |
---|
[1929] | 546 | pos_y = MERGE( MIN( 2.0_wp * ywall - pos_y, ywall ), & |
---|
| 547 | MAX( 2.0_wp * ywall - pos_y, ywall ), & |
---|
| 548 | particles(n)%y > ywall ) |
---|
[58] | 549 | |
---|
[1929] | 550 | particles(n)%speed_y = - particles(n)%speed_y |
---|
| 551 | particles(n)%rvar2 = - particles(n)%rvar2 |
---|
| 552 | |
---|
| 553 | reflect_y = .TRUE. |
---|
| 554 | y_ind(t_index:t_index_number) = j1 |
---|
[58] | 555 | |
---|
[1929] | 556 | ELSEIF ( y_wall_reached .AND. .NOT. reflect_y ) THEN |
---|
| 557 | y_ind(t_index:t_index_number) = j2 |
---|
[849] | 558 | ENDIF |
---|
[58] | 559 | ! |
---|
[1929] | 560 | !-- Check if a particle needs to be reflected at any xy-wall. If |
---|
[2232] | 561 | !-- necessary, carry out reflection. |
---|
[1929] | 562 | IF ( downwards .AND. reach_z(t_index) .AND. & |
---|
| 563 | .NOT. reflect_z ) THEN |
---|
[2232] | 564 | ! |
---|
| 565 | !-- Determine index of topography top at (j3,i3) and chick if |
---|
| 566 | !-- particle is below. |
---|
| 567 | k_wall = MAXLOC( & |
---|
| 568 | MERGE( 1, 0, & |
---|
| 569 | BTEST( wall_flags_0(nzb:nzb_max,j3,i3), 12 )& |
---|
| 570 | ), DIM = 1 & |
---|
| 571 | ) - 1 |
---|
| 572 | IF ( pos_z - zw(k_wall) < eps ) THEN |
---|
[1929] | 573 | |
---|
[2232] | 574 | pos_z = MAX( 2.0_wp * zw(k_wall) - pos_z, & |
---|
| 575 | zw(k_wall) ) |
---|
[58] | 576 | |
---|
[1929] | 577 | particles(n)%speed_z = - particles(n)%speed_z |
---|
| 578 | particles(n)%rvar3 = - particles(n)%rvar3 |
---|
[58] | 579 | |
---|
[1929] | 580 | reflect_z = .TRUE. |
---|
[58] | 581 | |
---|
[61] | 582 | ENDIF |
---|
[58] | 583 | |
---|
[849] | 584 | ENDIF |
---|
[58] | 585 | ! |
---|
[1929] | 586 | !-- Swap time |
---|
| 587 | t_old = t(t_index) |
---|
[58] | 588 | |
---|
[1929] | 589 | ENDDO |
---|
[61] | 590 | ! |
---|
[1929] | 591 | !-- If a particle was reflected, calculate final position from last |
---|
| 592 | !-- intermediate position. |
---|
| 593 | IF ( reflect_x .OR. reflect_y .OR. reflect_z ) THEN |
---|
[61] | 594 | |
---|
[1929] | 595 | particles(n)%x = pos_x + ( 1.0_wp - t_old ) * dt_particle & |
---|
| 596 | * particles(n)%speed_x |
---|
| 597 | particles(n)%y = pos_y + ( 1.0_wp - t_old ) * dt_particle & |
---|
| 598 | * particles(n)%speed_y |
---|
| 599 | particles(n)%z = pos_z + ( 1.0_wp - t_old ) * dt_particle & |
---|
| 600 | * particles(n)%speed_z |
---|
[61] | 601 | |
---|
[849] | 602 | ENDIF |
---|
[61] | 603 | |
---|
[1929] | 604 | ENDIF |
---|
[61] | 605 | |
---|
[849] | 606 | ENDDO |
---|
[58] | 607 | |
---|
[849] | 608 | CALL cpu_log( log_point_s(48), 'lpm_wall_reflect', 'stop' ) |
---|
[58] | 609 | |
---|
[849] | 610 | ENDIF |
---|
[61] | 611 | |
---|
[849] | 612 | END SUBROUTINE lpm_boundary_conds |
---|