1 | !> @file lpm_boundary_conds.f90 |
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2 | !------------------------------------------------------------------------------! |
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3 | ! This file is part of PALM. |
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4 | ! |
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5 | ! PALM is free software: you can redistribute it and/or modify it under the |
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6 | ! terms of the GNU General Public License as published by the Free Software |
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7 | ! Foundation, either version 3 of the License, or (at your option) any later |
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8 | ! version. |
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9 | ! |
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10 | ! PALM is distributed in the hope that it will be useful, but WITHOUT ANY |
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11 | ! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR |
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12 | ! A PARTICULAR PURPOSE. See the GNU General Public License for more details. |
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13 | ! |
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14 | ! You should have received a copy of the GNU General Public License along with |
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15 | ! PALM. If not, see <http://www.gnu.org/licenses/>. |
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16 | ! |
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17 | ! Copyright 1997-2016 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 2001 2016-08-20 18:41:22Z suehring $ |
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27 | ! |
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28 | ! 2000 2016-08-20 18:09:15Z knoop |
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29 | ! Forced header and separation lines into 80 columns |
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30 | ! |
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31 | ! 1929 2016-06-09 16:25:25Z suehring |
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32 | ! Rewritten wall reflection |
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33 | ! |
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34 | ! 1822 2016-04-07 07:49:42Z hoffmann |
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35 | ! Tails removed. Unused variables removed. |
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36 | ! |
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37 | ! 1682 2015-10-07 23:56:08Z knoop |
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38 | ! Code annotations made doxygen readable |
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39 | ! |
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40 | ! 1359 2014-04-11 17:15:14Z hoffmann |
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41 | ! New particle structure integrated. |
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42 | ! Kind definition added to all floating point numbers. |
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43 | ! |
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44 | ! 1320 2014-03-20 08:40:49Z raasch |
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45 | ! ONLY-attribute added to USE-statements, |
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46 | ! kind-parameters added to all INTEGER and REAL declaration statements, |
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47 | ! kinds are defined in new module kinds, |
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48 | ! revision history before 2012 removed, |
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49 | ! comment fields (!:) to be used for variable explanations added to |
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50 | ! all variable declaration statements |
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51 | ! |
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52 | ! 1036 2012-10-22 13:43:42Z raasch |
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53 | ! code put under GPL (PALM 3.9) |
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54 | ! |
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55 | ! 849 2012-03-15 10:35:09Z raasch |
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56 | ! routine renamed lpm_boundary_conds, bottom and top boundary conditions |
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57 | ! included (former part of advec_particles) |
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58 | ! |
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59 | ! 824 2012-02-17 09:09:57Z raasch |
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60 | ! particle attributes speed_x|y|z_sgs renamed rvar1|2|3 |
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61 | ! |
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62 | ! Initial version (2007/03/09) |
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63 | ! |
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64 | ! Description: |
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65 | ! ------------ |
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66 | !> Boundary conditions for the Lagrangian particles. |
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67 | !> The routine consists of two different parts. One handles the bottom (flat) |
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68 | !> and top boundary. In this part, also particles which exceeded their lifetime |
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69 | !> are deleted. |
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70 | !> The other part handles the reflection of particles from vertical walls. |
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71 | !> This part was developed by Jin Zhang during 2006-2007. |
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72 | !> |
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73 | !> To do: Code structure for finding the t_index values and for checking the |
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74 | !> ----- reflection conditions is basically the same for all four cases, so it |
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75 | !> should be possible to further simplify/shorten it. |
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76 | !> |
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77 | !> THE WALLS PART OF THIS ROUTINE HAS NOT BEEN TESTED FOR OCEAN RUNS SO FAR!!!! |
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78 | !> (see offset_ocean_*) |
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79 | !------------------------------------------------------------------------------! |
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80 | SUBROUTINE lpm_boundary_conds( range ) |
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81 | |
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82 | |
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83 | USE arrays_3d, & |
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84 | ONLY: zu, zw |
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85 | |
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86 | USE control_parameters, & |
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87 | ONLY: dz, message_string, particle_maximum_age |
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88 | |
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89 | USE cpulog, & |
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90 | ONLY: cpu_log, log_point_s |
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91 | |
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92 | USE grid_variables, & |
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93 | ONLY: ddx, dx, ddy, dy |
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94 | |
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95 | USE indices, & |
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96 | ONLY: nxl, nxr, nyn, nys, nz, nzb_s_inner |
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97 | |
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98 | USE kinds |
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99 | |
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100 | USE particle_attributes, & |
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101 | ONLY: deleted_particles, ibc_par_b, ibc_par_t, number_of_particles, & |
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102 | particles, particle_type, offset_ocean_nzt_m1, & |
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103 | use_sgs_for_particles |
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104 | |
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105 | USE pegrid |
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106 | |
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107 | IMPLICIT NONE |
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108 | |
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109 | CHARACTER (LEN=*) :: range !< |
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110 | |
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111 | INTEGER(iwp) :: inc !< dummy for sorting algorithmus |
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112 | INTEGER(iwp) :: ir !< dummy for sorting algorithmus |
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113 | INTEGER(iwp) :: i1 !< grid index (x) of old particle position |
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114 | INTEGER(iwp) :: i2 !< grid index (x) of current particle position |
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115 | INTEGER(iwp) :: i3 !< grid index (x) of intermediate particle position |
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116 | INTEGER(iwp) :: jr !< dummy for sorting algorithmus |
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117 | INTEGER(iwp) :: j1 !< grid index (y) of old particle position |
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118 | INTEGER(iwp) :: j2 !< grid index (x) of current particle position |
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119 | INTEGER(iwp) :: j3 !< grid index (x) of intermediate particle position |
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120 | INTEGER(iwp) :: n !< particle number |
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121 | INTEGER(iwp) :: t_index !< running index for intermediate particle timesteps in reflection algorithmus |
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122 | INTEGER(iwp) :: t_index_number !< number of intermediate particle timesteps in reflection algorithmus |
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123 | INTEGER(iwp) :: tmp_x !< dummy for sorting algorithmus |
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124 | INTEGER(iwp) :: tmp_y !< dummy for sorting algorithmus |
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125 | |
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126 | INTEGER(iwp), DIMENSION(0:10) :: x_ind(0:10) = 0 !< index array (x) of intermediate particle positions |
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127 | INTEGER(iwp), DIMENSION(0:10) :: y_ind(0:10) = 0 !< index array (x) of intermediate particle positions |
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128 | |
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129 | LOGICAL :: cross_wall_x !< flag to check if particle reflection along x is necessary |
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130 | LOGICAL :: cross_wall_y !< flag to check if particle reflection along y is necessary |
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131 | LOGICAL :: downwards !< flag to check if particle reflection along z is necessary (only if particle move downwards) |
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132 | LOGICAL :: reflect_x !< flag to check if particle is already reflected along x |
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133 | LOGICAL :: reflect_y !< flag to check if particle is already reflected along y |
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134 | LOGICAL :: reflect_z !< flag to check if particle is already reflected along z |
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135 | LOGICAL :: tmp_reach_x !< dummy for sorting algorithmus |
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136 | LOGICAL :: tmp_reach_y !< dummy for sorting algorithmus |
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137 | LOGICAL :: tmp_reach_z !< dummy for sorting algorithmus |
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138 | LOGICAL :: x_wall_reached !< flag to check if particle has already reached wall |
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139 | LOGICAL :: y_wall_reached !< flag to check if particle has already reached wall |
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140 | |
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141 | LOGICAL, DIMENSION(0:10) :: reach_x !< flag to check if particle is at a yz-wall |
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142 | LOGICAL, DIMENSION(0:10) :: reach_y !< flag to check if particle is at a xz-wall |
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143 | LOGICAL, DIMENSION(0:10) :: reach_z !< flag to check if particle is at a xy-wall |
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144 | |
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145 | REAL(wp) :: dt_particle !< particle timestep |
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146 | REAL(wp) :: dum !< dummy argument |
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147 | REAL(wp) :: eps = 1E-10_wp !< security number to check if particle has reached a wall |
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148 | REAL(wp) :: pos_x !< intermediate particle position (x) |
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149 | REAL(wp) :: pos_x_old !< particle position (x) at previous particle timestep |
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150 | REAL(wp) :: pos_y !< intermediate particle position (y) |
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151 | REAL(wp) :: pos_y_old !< particle position (y) at previous particle timestep |
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152 | REAL(wp) :: pos_z !< intermediate particle position (z) |
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153 | REAL(wp) :: pos_z_old !< particle position (z) at previous particle timestep |
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154 | REAL(wp) :: prt_x !< current particle position (x) |
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155 | REAL(wp) :: prt_y !< current particle position (y) |
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156 | REAL(wp) :: prt_z !< current particle position (z) |
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157 | REAL(wp) :: t_old !< previous reflection time |
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158 | REAL(wp) :: tmp_t !< dummy for sorting algorithmus |
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159 | REAL(wp) :: xwall !< location of wall in x |
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160 | REAL(wp) :: ywall !< location of wall in y |
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161 | REAL(wp) :: zwall1 !< location of wall in z (old grid box) |
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162 | REAL(wp) :: zwall2 !< location of wall in z (current grid box) |
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163 | REAL(wp) :: zwall3 !< location of wall in z (old y, current x) |
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164 | REAL(wp) :: zwall4 !< location of wall in z (current y, old x) |
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165 | |
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166 | REAL(wp), DIMENSION(0:10) :: t !< reflection time |
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167 | |
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168 | |
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169 | IF ( range == 'bottom/top' ) THEN |
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170 | |
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171 | ! |
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172 | !-- Apply boundary conditions to those particles that have crossed the top or |
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173 | !-- bottom boundary and delete those particles, which are older than allowed |
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174 | DO n = 1, number_of_particles |
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175 | |
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176 | ! |
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177 | !-- Stop if particles have moved further than the length of one |
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178 | !-- PE subdomain (newly released particles have age = age_m!) |
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179 | IF ( particles(n)%age /= particles(n)%age_m ) THEN |
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180 | IF ( ABS(particles(n)%speed_x) > & |
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181 | ((nxr-nxl+2)*dx)/(particles(n)%age-particles(n)%age_m) .OR. & |
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182 | ABS(particles(n)%speed_y) > & |
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183 | ((nyn-nys+2)*dy)/(particles(n)%age-particles(n)%age_m) ) THEN |
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184 | |
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185 | WRITE( message_string, * ) 'particle too fast. n = ', n |
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186 | CALL message( 'lpm_boundary_conds', 'PA0148', 2, 2, -1, 6, 1 ) |
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187 | ENDIF |
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188 | ENDIF |
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189 | |
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190 | IF ( particles(n)%age > particle_maximum_age .AND. & |
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191 | particles(n)%particle_mask ) & |
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192 | THEN |
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193 | particles(n)%particle_mask = .FALSE. |
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194 | deleted_particles = deleted_particles + 1 |
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195 | ENDIF |
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196 | |
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197 | IF ( particles(n)%z >= zu(nz) .AND. particles(n)%particle_mask ) THEN |
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198 | IF ( ibc_par_t == 1 ) THEN |
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199 | ! |
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200 | !-- Particle absorption |
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201 | particles(n)%particle_mask = .FALSE. |
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202 | deleted_particles = deleted_particles + 1 |
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203 | ELSEIF ( ibc_par_t == 2 ) THEN |
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204 | ! |
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205 | !-- Particle reflection |
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206 | particles(n)%z = 2.0_wp * zu(nz) - particles(n)%z |
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207 | particles(n)%speed_z = -particles(n)%speed_z |
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208 | IF ( use_sgs_for_particles .AND. & |
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209 | particles(n)%rvar3 > 0.0_wp ) THEN |
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210 | particles(n)%rvar3 = -particles(n)%rvar3 |
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211 | ENDIF |
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212 | ENDIF |
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213 | ENDIF |
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214 | |
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215 | IF ( particles(n)%z < zw(0) .AND. particles(n)%particle_mask ) THEN |
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216 | IF ( ibc_par_b == 1 ) THEN |
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217 | ! |
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218 | !-- Particle absorption |
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219 | particles(n)%particle_mask = .FALSE. |
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220 | deleted_particles = deleted_particles + 1 |
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221 | ELSEIF ( ibc_par_b == 2 ) THEN |
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222 | ! |
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223 | !-- Particle reflection |
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224 | particles(n)%z = 2.0_wp * zw(0) - particles(n)%z |
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225 | particles(n)%speed_z = -particles(n)%speed_z |
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226 | IF ( use_sgs_for_particles .AND. & |
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227 | particles(n)%rvar3 < 0.0_wp ) THEN |
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228 | particles(n)%rvar3 = -particles(n)%rvar3 |
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229 | ENDIF |
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230 | ENDIF |
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231 | ENDIF |
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232 | ENDDO |
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233 | |
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234 | ELSEIF ( range == 'walls' ) THEN |
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235 | |
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236 | |
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237 | CALL cpu_log( log_point_s(48), 'lpm_wall_reflect', 'start' ) |
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238 | |
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239 | DO n = 1, number_of_particles |
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240 | ! |
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241 | !-- Recalculate particle timestep |
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242 | dt_particle = particles(n)%age - particles(n)%age_m |
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243 | ! |
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244 | !-- Obtain x/y indices for current particle position |
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245 | i2 = ( particles(n)%x + 0.5_wp * dx ) * ddx |
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246 | j2 = ( particles(n)%y + 0.5_wp * dy ) * ddy |
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247 | ! |
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248 | !-- Save current particle positions |
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249 | prt_x = particles(n)%x |
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250 | prt_y = particles(n)%y |
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251 | prt_z = particles(n)%z |
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252 | ! |
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253 | !-- Recalculate old particle positions |
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254 | pos_x_old = particles(n)%x - particles(n)%speed_x * dt_particle |
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255 | pos_y_old = particles(n)%y - particles(n)%speed_y * dt_particle |
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256 | pos_z_old = particles(n)%z - particles(n)%speed_z * dt_particle |
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257 | ! |
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258 | !-- Obtain x/y indices for old particle positions |
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259 | i1 = ( pos_x_old + 0.5_wp * dx ) * ddx |
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260 | j1 = ( pos_y_old + 0.5_wp * dy ) * ddy |
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261 | ! |
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262 | !-- Determine horizontal as well as vertical walls at which particle can |
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263 | !-- be potentially reflected. |
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264 | !-- Start with walls aligned in yz layer. |
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265 | !-- Wall to the right |
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266 | IF ( prt_x > pos_x_old ) THEN |
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267 | xwall = ( i1 + 0.5_wp ) * dx |
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268 | ! |
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269 | !-- Wall to the left |
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270 | ELSE |
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271 | xwall = ( i1 - 0.5_wp ) * dx |
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272 | ENDIF |
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273 | ! |
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274 | !-- Walls aligned in xz layer |
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275 | !-- Wall to the north |
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276 | IF ( prt_y > pos_y_old ) THEN |
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277 | ywall = ( j1 + 0.5_wp ) * dy |
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278 | !-- Wall to the south |
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279 | ELSE |
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280 | ywall = ( j1 - 0.5_wp ) * dy |
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281 | ENDIF |
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282 | ! |
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283 | !-- Walls aligned in xy layer at which particle can be possiblly reflected |
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284 | zwall1 = zw(nzb_s_inner(j2,i2)) |
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285 | zwall2 = zw(nzb_s_inner(j1,i1)) |
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286 | zwall3 = zw(nzb_s_inner(j1,i2)) |
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287 | zwall4 = zw(nzb_s_inner(j2,i1)) |
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288 | ! |
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289 | !-- Initialize flags to check if particle reflection is necessary |
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290 | downwards = .FALSE. |
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291 | cross_wall_x = .FALSE. |
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292 | cross_wall_y = .FALSE. |
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293 | ! |
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294 | !-- Initialize flags to check if a wall is reached |
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295 | reach_x = .FALSE. |
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296 | reach_y = .FALSE. |
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297 | reach_z = .FALSE. |
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298 | ! |
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299 | !-- Initialize flags to check if a particle was already reflected |
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300 | reflect_x = .FALSE. |
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301 | reflect_y = .FALSE. |
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302 | reflect_z = .FALSE. |
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303 | ! |
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304 | !-- Initialize flags to check if a vertical wall is already crossed. |
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305 | !-- ( Required to obtain correct indices. ) |
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306 | x_wall_reached = .FALSE. |
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307 | y_wall_reached = .FALSE. |
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308 | ! |
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309 | !-- Initialize time array |
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310 | t = 0.0_wp |
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311 | ! |
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312 | !-- Check if particle can reach any wall. This case, calculate the |
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313 | !-- fractional time needed to reach this wall. Store this fractional |
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314 | !-- timestep in array t. Moreover, store indices for these grid |
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315 | !-- boxes where the respective wall belongs to. |
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316 | !-- Start with x-direction. |
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317 | t_index = 1 |
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318 | t(t_index) = ( xwall - pos_x_old ) & |
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319 | / MERGE( MAX( prt_x - pos_x_old, 1E-30_wp ), & |
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320 | MIN( prt_x - pos_x_old, -1E-30_wp ), & |
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321 | prt_x > pos_x_old ) |
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322 | x_ind(t_index) = i2 |
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323 | y_ind(t_index) = j1 |
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324 | reach_x(t_index) = .TRUE. |
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325 | reach_y(t_index) = .FALSE. |
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326 | reach_z(t_index) = .FALSE. |
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327 | ! |
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328 | !-- Store these values only if particle really reaches any wall. t must |
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329 | !-- be in a interval between [0:1]. |
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330 | IF ( t(t_index) <= 1.0_wp .AND. t(t_index) >= 0.0_wp ) THEN |
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331 | t_index = t_index + 1 |
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332 | cross_wall_x = .TRUE. |
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333 | ENDIF |
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334 | ! |
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335 | !-- y-direction |
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336 | t(t_index) = ( ywall - pos_y_old ) & |
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337 | / MERGE( MAX( prt_y - pos_y_old, 1E-30_wp ), & |
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338 | MIN( prt_y - pos_y_old, -1E-30_wp ), & |
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339 | prt_y > pos_y_old ) |
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340 | x_ind(t_index) = i1 |
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341 | y_ind(t_index) = j2 |
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342 | reach_x(t_index) = .FALSE. |
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343 | reach_y(t_index) = .TRUE. |
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344 | reach_z(t_index) = .FALSE. |
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345 | IF ( t(t_index) <= 1.0_wp .AND. t(t_index) >= 0.0_wp ) THEN |
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346 | t_index = t_index + 1 |
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347 | cross_wall_y = .TRUE. |
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348 | ENDIF |
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349 | ! |
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350 | !-- z-direction |
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351 | !-- At first, check if particle moves downwards. Only in this case a |
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352 | !-- particle can be reflected vertically. |
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353 | IF ( prt_z < pos_z_old ) THEN |
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354 | |
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355 | downwards = .TRUE. |
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356 | dum = 1.0_wp / MERGE( MAX( prt_z - pos_z_old, 1E-30_wp ), & |
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357 | MIN( prt_z - pos_z_old, -1E-30_wp ), & |
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358 | prt_z > pos_z_old ) |
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359 | |
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360 | t(t_index) = ( zwall1 - pos_z_old ) * dum |
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361 | x_ind(t_index) = i2 |
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362 | y_ind(t_index) = j2 |
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363 | reach_x(t_index) = .FALSE. |
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364 | reach_y(t_index) = .FALSE. |
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365 | reach_z(t_index) = .TRUE. |
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366 | IF ( t(t_index) <= 1.0_wp .AND. t(t_index) >= 0.0_wp ) & |
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367 | t_index = t_index + 1 |
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368 | |
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369 | reach_x(t_index) = .FALSE. |
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370 | reach_y(t_index) = .FALSE. |
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371 | reach_z(t_index) = .TRUE. |
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372 | t(t_index) = ( zwall2 - pos_z_old ) * dum |
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373 | x_ind(t_index) = i1 |
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374 | y_ind(t_index) = j1 |
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375 | IF ( t(t_index) <= 1.0_wp .AND. t(t_index) >= 0.0_wp ) & |
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376 | t_index = t_index + 1 |
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377 | |
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378 | reach_x(t_index) = .FALSE. |
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379 | reach_y(t_index) = .FALSE. |
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380 | reach_z(t_index) = .TRUE. |
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381 | t(t_index) = ( zwall3 - pos_z_old ) * dum |
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382 | x_ind(t_index) = i2 |
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383 | y_ind(t_index) = j1 |
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384 | IF ( t(t_index) <= 1.0_wp .AND. t(t_index) >= 0.0_wp ) & |
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385 | t_index = t_index + 1 |
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386 | |
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387 | reach_x(t_index) = .FALSE. |
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388 | reach_y(t_index) = .FALSE. |
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389 | reach_z(t_index) = .TRUE. |
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390 | t(t_index) = ( zwall4 - pos_z_old ) * dum |
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391 | x_ind(t_index) = i1 |
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392 | y_ind(t_index) = j2 |
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393 | IF ( t(t_index) <= 1.0_wp .AND. t(t_index) >= 0.0_wp ) & |
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394 | t_index = t_index + 1 |
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395 | |
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396 | END IF |
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397 | t_index_number = t_index - 1 |
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398 | ! |
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399 | !-- Carry out reflection only if particle reaches any wall |
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400 | IF ( cross_wall_x .OR. cross_wall_y .OR. downwards ) THEN |
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401 | ! |
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402 | !-- Sort fractional timesteps in ascending order. Also sort the |
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403 | !-- corresponding indices and flag according to the time interval a |
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404 | !-- particle reaches the respective wall. |
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405 | inc = 1 |
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406 | jr = 1 |
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407 | DO WHILE ( inc <= t_index_number ) |
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408 | inc = 3 * inc + 1 |
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409 | ENDDO |
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410 | |
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411 | DO WHILE ( inc > 1 ) |
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412 | inc = inc / 3 |
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413 | DO ir = inc+1, t_index_number |
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414 | tmp_t = t(ir) |
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415 | tmp_x = x_ind(ir) |
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416 | tmp_y = y_ind(ir) |
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417 | tmp_reach_x = reach_x(ir) |
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418 | tmp_reach_y = reach_y(ir) |
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419 | tmp_reach_z = reach_z(ir) |
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420 | jr = ir |
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421 | DO WHILE ( t(jr-inc) > tmp_t ) |
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422 | t(jr) = t(jr-inc) |
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423 | x_ind(jr) = x_ind(jr-inc) |
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424 | y_ind(jr) = y_ind(jr-inc) |
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425 | reach_x(jr) = reach_x(jr-inc) |
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426 | reach_y(jr) = reach_y(jr-inc) |
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427 | reach_z(jr) = reach_z(jr-inc) |
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428 | jr = jr - inc |
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429 | IF ( jr <= inc ) EXIT |
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430 | ENDDO |
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431 | t(jr) = tmp_t |
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432 | x_ind(jr) = tmp_x |
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433 | y_ind(jr) = tmp_y |
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434 | reach_x(jr) = tmp_reach_x |
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435 | reach_y(jr) = tmp_reach_y |
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436 | reach_z(jr) = tmp_reach_z |
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437 | ENDDO |
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438 | ENDDO |
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439 | ! |
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440 | !-- Initialize temporary particle positions |
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441 | pos_x = pos_x_old |
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442 | pos_y = pos_y_old |
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443 | pos_z = pos_z_old |
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444 | ! |
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445 | !-- Loop over all times a particle possibly moves into a new grid box |
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446 | t_old = 0.0_wp |
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447 | DO t_index = 1, t_index_number |
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448 | ! |
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449 | !-- Calculate intermediate particle position according to the |
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450 | !-- timesteps a particle reaches any wall. |
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451 | pos_x = pos_x + ( t(t_index) - t_old ) * dt_particle & |
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452 | * particles(n)%speed_x |
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453 | pos_y = pos_y + ( t(t_index) - t_old ) * dt_particle & |
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454 | * particles(n)%speed_y |
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455 | pos_z = pos_z + ( t(t_index) - t_old ) * dt_particle & |
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456 | * particles(n)%speed_z |
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457 | ! |
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458 | !-- Obtain x/y grid indices for intermediate particle position from |
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459 | !-- sorted index array |
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460 | i3 = x_ind(t_index) |
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461 | j3 = y_ind(t_index) |
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462 | ! |
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463 | !-- Check which wall is already reached |
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464 | IF ( .NOT. x_wall_reached ) x_wall_reached = reach_x(t_index) |
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465 | IF ( .NOT. y_wall_reached ) y_wall_reached = reach_y(t_index) |
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466 | ! |
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467 | !-- Check if a particle needs to be reflected at any yz-wall. If |
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468 | !-- necessary, carry out reflection. Please note, a security |
---|
469 | !-- constant is required, as the particle position do not |
---|
470 | !-- necessarily exactly match the wall location due to rounding |
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471 | !-- errors. |
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472 | IF ( ABS( pos_x - xwall ) < eps .AND. & |
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473 | pos_z <= zw(nzb_s_inner(j3,i3)) .AND. & |
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474 | reach_x(t_index) .AND. & |
---|
475 | .NOT. reflect_x ) THEN |
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476 | ! |
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477 | !-- Reflection in x-direction. |
---|
478 | !-- Ensure correct reflection by MIN/MAX functions, depending on |
---|
479 | !-- direction of particle transport. |
---|
480 | !-- Due to rounding errors pos_x do not exactly matches the wall |
---|
481 | !-- location, leading to erroneous reflection. |
---|
482 | pos_x = MERGE( MIN( 2.0_wp * xwall - pos_x, xwall ), & |
---|
483 | MAX( 2.0_wp * xwall - pos_x, xwall ), & |
---|
484 | particles(n)%x > xwall ) |
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485 | ! |
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486 | !-- Change sign of particle speed |
---|
487 | particles(n)%speed_x = - particles(n)%speed_x |
---|
488 | ! |
---|
489 | !-- Change also sign of subgrid-scale particle speed |
---|
490 | particles(n)%rvar1 = - particles(n)%rvar1 |
---|
491 | ! |
---|
492 | !-- Set flag that reflection along x is already done |
---|
493 | reflect_x = .TRUE. |
---|
494 | ! |
---|
495 | !-- As particle do not crosses any further yz-wall during |
---|
496 | !-- this timestep, set further x-indices to the current one. |
---|
497 | x_ind(t_index:t_index_number) = i1 |
---|
498 | ! |
---|
499 | !-- If particle already reached the wall but was not reflected, |
---|
500 | !-- set further x-indices to the new one. |
---|
501 | ELSEIF ( x_wall_reached .AND. .NOT. reflect_x ) THEN |
---|
502 | x_ind(t_index:t_index_number) = i2 |
---|
503 | ENDIF |
---|
504 | ! |
---|
505 | !-- Check if a particle needs to be reflected at any xz-wall. If |
---|
506 | !-- necessary, carry out reflection. |
---|
507 | IF ( ABS( pos_y - ywall ) < eps .AND. & |
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508 | pos_z <= zw(nzb_s_inner(j3,i3)) .AND. & |
---|
509 | reach_y(t_index) .AND. & |
---|
510 | .NOT. reflect_y ) THEN |
---|
511 | |
---|
512 | pos_y = MERGE( MIN( 2.0_wp * ywall - pos_y, ywall ), & |
---|
513 | MAX( 2.0_wp * ywall - pos_y, ywall ), & |
---|
514 | particles(n)%y > ywall ) |
---|
515 | |
---|
516 | particles(n)%speed_y = - particles(n)%speed_y |
---|
517 | particles(n)%rvar2 = - particles(n)%rvar2 |
---|
518 | |
---|
519 | reflect_y = .TRUE. |
---|
520 | y_ind(t_index:t_index_number) = j1 |
---|
521 | |
---|
522 | ELSEIF ( y_wall_reached .AND. .NOT. reflect_y ) THEN |
---|
523 | y_ind(t_index:t_index_number) = j2 |
---|
524 | ENDIF |
---|
525 | ! |
---|
526 | !-- Check if a particle needs to be reflected at any xy-wall. If |
---|
527 | !-- necessary, carry out reflection. |
---|
528 | IF ( downwards .AND. reach_z(t_index) .AND. & |
---|
529 | .NOT. reflect_z ) THEN |
---|
530 | IF ( pos_z - zw(nzb_s_inner(j3,i3)) < eps ) THEN |
---|
531 | |
---|
532 | pos_z = MAX( 2.0_wp * zw(nzb_s_inner(j3,i3)) - pos_z, & |
---|
533 | zw(nzb_s_inner(j3,i3)) ) |
---|
534 | |
---|
535 | particles(n)%speed_z = - particles(n)%speed_z |
---|
536 | particles(n)%rvar3 = - particles(n)%rvar3 |
---|
537 | |
---|
538 | reflect_z = .TRUE. |
---|
539 | |
---|
540 | ENDIF |
---|
541 | |
---|
542 | ENDIF |
---|
543 | ! |
---|
544 | !-- Swap time |
---|
545 | t_old = t(t_index) |
---|
546 | |
---|
547 | ENDDO |
---|
548 | ! |
---|
549 | !-- If a particle was reflected, calculate final position from last |
---|
550 | !-- intermediate position. |
---|
551 | IF ( reflect_x .OR. reflect_y .OR. reflect_z ) THEN |
---|
552 | |
---|
553 | particles(n)%x = pos_x + ( 1.0_wp - t_old ) * dt_particle & |
---|
554 | * particles(n)%speed_x |
---|
555 | particles(n)%y = pos_y + ( 1.0_wp - t_old ) * dt_particle & |
---|
556 | * particles(n)%speed_y |
---|
557 | particles(n)%z = pos_z + ( 1.0_wp - t_old ) * dt_particle & |
---|
558 | * particles(n)%speed_z |
---|
559 | |
---|
560 | ENDIF |
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561 | |
---|
562 | ENDIF |
---|
563 | |
---|
564 | ENDDO |
---|
565 | |
---|
566 | CALL cpu_log( log_point_s(48), 'lpm_wall_reflect', 'stop' ) |
---|
567 | |
---|
568 | ENDIF |
---|
569 | |
---|
570 | END SUBROUTINE lpm_boundary_conds |
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