1 | SUBROUTINE init_slope |
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2 | |
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3 | !--------------------------------------------------------------------------------! |
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4 | ! This file is part of PALM. |
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5 | ! |
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6 | ! PALM is free software: you can redistribute it and/or modify it under the terms |
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7 | ! of the GNU General Public License as published by the Free Software Foundation, |
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8 | ! either version 3 of the License, or (at your option) any later 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 1997-2012 Leibniz University 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 | ! Former revisions: |
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24 | ! ----------------- |
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25 | ! $Id: init_slope.f90 1037 2012-10-22 14:10:22Z raasch $ |
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26 | ! |
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27 | ! 1036 2012-10-22 13:43:42Z raasch |
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28 | ! code put under GPL (PALM 3.9) |
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29 | ! |
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30 | ! 667 2010-12-23 12:06:00Z suehring/gryschka |
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31 | ! nxl-1, nxr+1, nys-1, nyn+1 replaced by nxlg, nxrg, nysg, nyng. |
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32 | ! |
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33 | ! 622 2010-12-10 08:08:13Z raasch |
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34 | ! optional barriers included in order to speed up collective operations |
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35 | ! |
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36 | ! Feb. 2007 |
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37 | ! RCS Log replace by Id keyword, revision history cleaned up |
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38 | ! |
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39 | ! Revision 1.5 2006/02/23 12:35:34 raasch |
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40 | ! nanz_2dh renamed ngp_2dh |
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41 | ! |
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42 | ! Revision 1.1 2000/04/27 07:06:24 raasch |
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43 | ! Initial revision |
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44 | ! |
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45 | ! |
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46 | ! Description: |
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47 | ! ------------ |
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48 | ! Initialization of the temperature field and other variables used in case |
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49 | ! of a sloping surface. |
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50 | ! Remember: when a sloping surface is used, only one constant temperature |
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51 | ! gradient is allowed! |
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52 | !------------------------------------------------------------------------------! |
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53 | |
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54 | USE arrays_3d |
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55 | USE constants |
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56 | USE grid_variables |
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57 | USE indices |
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58 | USE pegrid |
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59 | USE control_parameters |
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60 | |
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61 | IMPLICIT NONE |
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62 | |
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63 | INTEGER :: i, j, k |
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64 | REAL :: alpha, height, pt_value, radius |
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65 | REAL, DIMENSION(:), ALLOCATABLE :: pt_init_local |
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66 | |
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67 | ! |
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68 | !-- Calculate reference temperature field needed for computing buoyancy |
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69 | ALLOCATE( pt_slope_ref(nzb:nzt+1,nxlg:nxrg) ) |
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70 | |
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71 | DO i = nxlg, nxrg |
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72 | DO k = nzb, nzt+1 |
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73 | |
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74 | ! |
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75 | !-- Compute height of grid-point relative to lower left corner of |
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76 | !-- the total domain. |
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77 | !-- First compute the distance between the actual grid point and the |
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78 | !-- lower left corner as well as the angle between the line connecting |
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79 | !-- these points and the bottom of the model. |
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80 | IF ( k /= nzb ) THEN |
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81 | radius = SQRT( ( i * dx )**2 + zu(k)**2 ) |
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82 | height = zu(k) |
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83 | ELSE |
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84 | radius = SQRT( ( i * dx )**2 ) |
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85 | height = 0.0 |
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86 | ENDIF |
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87 | IF ( radius /= 0.0 ) THEN |
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88 | alpha = ASIN( height / radius ) |
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89 | ELSE |
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90 | alpha = 0.0 |
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91 | ENDIF |
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92 | ! |
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93 | !-- Compute temperatures in the rotated coordinate system |
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94 | alpha = alpha + alpha_surface / 180.0 * pi |
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95 | pt_value = pt_surface + radius * SIN( alpha ) * & |
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96 | pt_vertical_gradient(1) / 100.0 |
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97 | pt_slope_ref(k,i) = pt_value |
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98 | ENDDO |
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99 | ENDDO |
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100 | |
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101 | ! |
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102 | !-- Temperature difference between left and right boundary of the total domain, |
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103 | !-- used for the cyclic boundary in x-direction |
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104 | pt_slope_offset = (nx+1) * dx * sin_alpha_surface * & |
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105 | pt_vertical_gradient(1) / 100.0 |
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106 | |
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107 | |
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108 | ! |
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109 | !-- Following action must only be executed for initial runs |
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110 | IF ( TRIM( initializing_actions ) /= 'read_restart_data' ) THEN |
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111 | ! |
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112 | !-- Set initial temperature equal to the reference temperature field |
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113 | DO j = nysg, nyng |
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114 | pt(:,j,:) = pt_slope_ref |
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115 | ENDDO |
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116 | |
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117 | ! |
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118 | !-- Recompute the mean initial temperature profile (mean along x-direction of |
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119 | !-- the rotated coordinate system) |
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120 | ALLOCATE( pt_init_local(nzb:nzt+1) ) |
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121 | pt_init_local = 0.0 |
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122 | DO i = nxl, nxr |
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123 | DO j = nys, nyn |
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124 | DO k = nzb, nzt+1 |
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125 | pt_init_local(k) = pt_init_local(k) + pt(k,j,i) |
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126 | ENDDO |
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127 | ENDDO |
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128 | ENDDO |
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129 | |
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130 | #if defined( __parallel ) |
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131 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
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132 | CALL MPI_ALLREDUCE( pt_init_local, pt_init, nzt+2-nzb, MPI_REAL, & |
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133 | MPI_SUM, comm2d, ierr ) |
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134 | #else |
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135 | pt_init = pt_init_local |
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136 | #endif |
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137 | |
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138 | pt_init = pt_init / ngp_2dh(0) |
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139 | DEALLOCATE( pt_init_local ) |
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140 | |
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141 | ENDIF |
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142 | |
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143 | END SUBROUTINE init_slope |
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