1 | SUBROUTINE init_rankine |
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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_rankine.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 | ! Calls of exchange_horiz are modified. |
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33 | ! |
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34 | ! 107 2007-08-17 13:54:45Z raasch |
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35 | ! Initial profiles are reset to constant profiles |
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36 | ! |
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37 | ! 75 2007-03-22 09:54:05Z raasch |
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38 | ! uxrp, vynp eliminated, 2nd+3rd argument removed from exchange horiz |
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39 | ! |
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40 | ! RCS Log replace by Id keyword, revision history cleaned up |
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41 | ! |
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42 | ! Revision 1.11 2005/03/26 20:38:49 raasch |
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43 | ! Arguments for non-cyclic boundary conditions added to argument list of |
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44 | ! routine exchange_horiz |
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45 | ! |
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46 | ! Revision 1.1 1997/08/11 06:18:43 raasch |
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47 | ! Initial revision |
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48 | ! |
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49 | ! |
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50 | ! Description: |
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51 | ! ------------ |
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52 | ! Initialize a (nondivergent) Rankine eddy with a vertical axis in order to test |
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53 | ! the advection terms and the pressure solver. |
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54 | !------------------------------------------------------------------------------! |
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55 | |
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56 | USE arrays_3d |
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57 | USE constants |
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58 | USE grid_variables |
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59 | USE indices |
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60 | USE control_parameters |
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61 | |
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62 | IMPLICIT NONE |
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63 | |
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64 | INTEGER :: i, ic, j, jc, k, kc1, kc2 |
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65 | REAL :: alpha, betrag, radius, rc, uw, vw, x, y |
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66 | |
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67 | ! |
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68 | !-- Default: eddy radius rc, eddy strength z, |
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69 | !-- position of eddy centre: ic, jc, kc1, kc2 |
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70 | rc = 4.0 * dx |
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71 | ic = ( nx+1 ) / 2 |
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72 | jc = ic |
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73 | kc1 = nzb |
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74 | kc2 = nzt+1 |
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75 | |
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76 | ! |
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77 | !-- Reset initial profiles to constant profiles |
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78 | IF ( INDEX(initializing_actions, 'set_constant_profiles') /= 0 ) THEN |
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79 | DO i = nxlg, nxrg |
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80 | DO j = nysg, nyng |
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81 | pt(:,j,i) = pt_init |
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82 | u(:,j,i) = u_init |
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83 | v(:,j,i) = v_init |
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84 | ENDDO |
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85 | ENDDO |
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86 | ENDIF |
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87 | |
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88 | ! |
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89 | !-- Compute the u-component. |
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90 | DO i = nxl, nxr |
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91 | DO j = nys, nyn |
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92 | x = ( i - ic - 0.5 ) * dx |
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93 | y = ( j - jc ) * dy |
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94 | radius = SQRT( x**2 + y**2 ) |
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95 | IF ( radius <= 2.0 * rc ) THEN |
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96 | betrag = radius / ( 2.0 * rc ) * 0.08 |
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97 | ELSEIF ( radius > 2.0 * rc .AND. radius < 8.0 * rc ) THEN |
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98 | betrag = 0.08 * EXP( -( radius - 2.0 * rc ) / 2.0 ) |
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99 | ELSE |
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100 | betrag = 0.0 |
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101 | ENDIF |
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102 | |
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103 | IF ( x == 0.0 ) THEN |
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104 | IF ( y > 0.0 ) THEN |
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105 | alpha = pi / 2.0 |
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106 | ELSEIF ( y < 0.0 ) THEN |
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107 | alpha = 3.0 * pi / 2.0 |
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108 | ENDIF |
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109 | ELSE |
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110 | IF ( x < 0.0 ) THEN |
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111 | alpha = ATAN( y / x ) + pi |
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112 | ELSE |
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113 | IF ( y < 0.0 ) THEN |
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114 | alpha = ATAN( y / x ) + 2.0 * pi |
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115 | ELSE |
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116 | alpha = ATAN( y / x ) |
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117 | ENDIF |
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118 | ENDIF |
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119 | ENDIF |
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120 | |
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121 | uw = -SIN( alpha ) * betrag |
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122 | |
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123 | DO k = kc1, kc2 |
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124 | u(k,j,i) = u(k,j,i) + uw |
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125 | ENDDO |
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126 | ENDDO |
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127 | ENDDO |
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128 | |
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129 | ! |
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130 | !-- Compute the v-component. |
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131 | DO i = nxl, nxr |
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132 | DO j = nys, nyn |
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133 | x = ( i - ic ) * dx |
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134 | y = ( j - jc - 0.5) * dy |
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135 | radius = SQRT( x**2 + y**2 ) |
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136 | IF ( radius <= 2.0 * rc ) THEN |
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137 | betrag = radius / ( 2.0 * rc ) * 0.08 |
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138 | ELSEIF ( radius > 2.0 * rc .AND. radius < 8.0 * rc ) THEN |
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139 | betrag = 0.08 * EXP( -( radius - 2.0 * rc ) / 2.0 ) |
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140 | ELSE |
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141 | betrag = 0.0 |
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142 | ENDIF |
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143 | |
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144 | IF ( x == 0.0 ) THEN |
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145 | IF ( y > 0.0 ) THEN |
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146 | alpha = pi / 2.0 |
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147 | ELSEIF ( y < 0.0 ) THEN |
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148 | alpha = 3.0 * pi / 2.0 |
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149 | ENDIF |
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150 | ELSE |
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151 | IF ( x < 0.0 ) THEN |
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152 | alpha = ATAN( y / x ) + pi |
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153 | ELSE |
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154 | IF ( y < 0.0 ) THEN |
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155 | alpha = ATAN( y / x ) + 2.0 * pi |
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156 | ELSE |
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157 | alpha = ATAN( y / x ) |
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158 | ENDIF |
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159 | ENDIF |
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160 | ENDIF |
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161 | |
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162 | vw = COS( alpha ) * betrag |
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163 | |
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164 | DO k = kc1, kc2 |
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165 | v(k,j,i) = v(k,j,i) + vw |
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166 | ENDDO |
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167 | ENDDO |
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168 | ENDDO |
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169 | |
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170 | ! |
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171 | !-- Exchange of boundary values for the velocities. |
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172 | CALL exchange_horiz( u, nbgp) |
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173 | CALL exchange_horiz( v, nbgp ) |
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174 | ! |
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175 | !-- Make velocity field nondivergent. |
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176 | n_sor = nsor_ini |
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177 | CALL pres |
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178 | n_sor = nsor |
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179 | |
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180 | END SUBROUTINE init_rankine |
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