[1] | 1 | SUBROUTINE init_rankine |
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| 2 | |
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| 3 | !------------------------------------------------------------------------------! |
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| 4 | ! Actual revisions: |
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| 5 | ! ----------------- |
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| 6 | ! |
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| 7 | ! |
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| 8 | ! Former revisions: |
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| 9 | ! ----------------- |
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| 10 | ! $Log: init_rankine.f90,v $ |
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| 11 | ! Revision 1.11 2005/03/26 20:38:49 raasch |
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| 12 | ! Arguments for non-cyclic boundary conditions added to argument list of |
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| 13 | ! routine exchange_horiz |
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| 14 | ! |
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| 15 | ! Revision 1.10 2004/01/28 15:11:27 raasch |
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| 16 | ! Setting of bt before calling pres removed |
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| 17 | ! |
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| 18 | ! Revision 1.9 2001/03/30 07:32:49 raasch |
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| 19 | ! Arguments removed from pres, |
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| 20 | ! Translation of remaining German identifiers (variables, subroutines, etc.) |
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| 21 | ! |
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| 22 | ! Revision 1.8 2001/01/22 19:44:52 letzel |
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| 23 | ! All comments translated into English. |
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| 24 | ! |
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| 25 | ! Revision 1.7 2001/01/22 07:20:30 raasch |
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| 26 | ! Module test_variables removed |
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| 27 | ! |
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| 28 | ! Revision 1.6 1998/07/06 12:17:44 raasch |
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| 29 | ! + USE test_variables |
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| 30 | ! |
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| 31 | ! Revision 1.5 1998/04/15 11:20:38 raasch |
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| 32 | ! pt, usws und vsws werden an pres uebergeben |
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| 33 | ! |
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| 34 | ! Revision 1.4 1997/09/12 06:26:30 raasch |
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| 35 | ! Wirbelradius jetzt proportional zur Gitterweite |
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| 36 | ! |
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| 37 | ! Revision 1.3 1997/09/09 08:29:24 raasch |
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| 38 | ! Kehrwerte der Gitterweiten implementiert |
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| 39 | ! |
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| 40 | ! Revision 1.2 1997/08/26 06:31:33 raasch |
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| 41 | ! +tend in pres-Aufruf |
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| 42 | ! |
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| 43 | ! Revision 1.1 1997/08/11 06:18:43 raasch |
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| 44 | ! Initial revision |
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| 45 | ! |
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| 46 | ! |
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| 47 | ! Description: |
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| 48 | ! ------------ |
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| 49 | ! Initialize a (nondivergent) Rankine eddy with a vertical axis in order to test |
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| 50 | ! the advection terms and the pressure solver. |
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| 51 | !------------------------------------------------------------------------------! |
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| 52 | |
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| 53 | USE arrays_3d |
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| 54 | USE constants |
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| 55 | USE grid_variables |
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| 56 | USE indices |
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| 57 | USE control_parameters |
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| 58 | |
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| 59 | IMPLICIT NONE |
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| 60 | |
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| 61 | INTEGER :: i, ic, j, jc, k, kc1, kc2 |
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| 62 | REAL :: alpha, betrag, radius, rc, uw, vw, x, y |
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| 63 | |
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| 64 | ! |
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| 65 | !-- Default: eddy radius rc, eddy strength z, |
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| 66 | !-- position of eddy centre: ic, jc, kc1, kc2 |
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| 67 | rc = 4.0 * dx |
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| 68 | ic = ( nx+1 ) / 2 |
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| 69 | jc = ic |
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| 70 | kc1 = nzb |
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| 71 | kc2 = nzt+1 |
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| 72 | |
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| 73 | ! |
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| 74 | !-- Compute the u-component. |
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| 75 | DO i = nxl, nxr |
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| 76 | DO j = nys, nyn |
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| 77 | x = ( i - ic - 0.5 ) * dx |
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| 78 | y = ( j - jc ) * dy |
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| 79 | radius = SQRT( x**2 + y**2 ) |
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| 80 | IF ( radius <= 2.0 * rc ) THEN |
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| 81 | betrag = radius / ( 2.0 * rc ) * 0.08 |
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| 82 | ELSEIF ( radius > 2.0 * rc .AND. radius < 8.0 * rc ) THEN |
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| 83 | betrag = 0.08 * EXP( -( radius - 2.0 * rc ) / 2.0 ) |
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| 84 | ELSE |
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| 85 | betrag = 0.0 |
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| 86 | ENDIF |
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| 87 | |
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| 88 | IF ( x == 0.0 ) THEN |
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| 89 | IF ( y > 0.0 ) THEN |
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| 90 | alpha = pi / 2.0 |
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| 91 | ELSEIF ( y < 0.0 ) THEN |
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| 92 | alpha = 3.0 * pi / 2.0 |
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| 93 | ENDIF |
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| 94 | ELSE |
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| 95 | IF ( x < 0.0 ) THEN |
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| 96 | alpha = ATAN( y / x ) + pi |
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| 97 | ELSE |
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| 98 | IF ( y < 0.0 ) THEN |
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| 99 | alpha = ATAN( y / x ) + 2.0 * pi |
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| 100 | ELSE |
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| 101 | alpha = ATAN( y / x ) |
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| 102 | ENDIF |
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| 103 | ENDIF |
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| 104 | ENDIF |
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| 105 | |
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| 106 | uw = -SIN( alpha ) * betrag |
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| 107 | |
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| 108 | DO k = kc1, kc2 |
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| 109 | u(k,j,i) = u(k,j,i) + uw |
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| 110 | ENDDO |
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| 111 | ENDDO |
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| 112 | ENDDO |
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| 113 | |
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| 114 | ! |
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| 115 | !-- Compute the v-component. |
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| 116 | DO i = nxl, nxr |
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| 117 | DO j = nys, nyn |
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| 118 | x = ( i - ic ) * dx |
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| 119 | y = ( j - jc - 0.5) * dy |
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| 120 | radius = SQRT( x**2 + y**2 ) |
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| 121 | IF ( radius <= 2.0 * rc ) THEN |
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| 122 | betrag = radius / ( 2.0 * rc ) * 0.08 |
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| 123 | ELSEIF ( radius > 2.0 * rc .AND. radius < 8.0 * rc ) THEN |
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| 124 | betrag = 0.08 * EXP( -( radius - 2.0 * rc ) / 2.0 ) |
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| 125 | ELSE |
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| 126 | betrag = 0.0 |
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| 127 | ENDIF |
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| 128 | |
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| 129 | IF ( x == 0.0 ) THEN |
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| 130 | IF ( y > 0.0 ) THEN |
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| 131 | alpha = pi / 2.0 |
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| 132 | ELSEIF ( y < 0.0 ) THEN |
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| 133 | alpha = 3.0 * pi / 2.0 |
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| 134 | ENDIF |
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| 135 | ELSE |
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| 136 | IF ( x < 0.0 ) THEN |
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| 137 | alpha = ATAN( y / x ) + pi |
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| 138 | ELSE |
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| 139 | IF ( y < 0.0 ) THEN |
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| 140 | alpha = ATAN( y / x ) + 2.0 * pi |
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| 141 | ELSE |
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| 142 | alpha = ATAN( y / x ) |
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| 143 | ENDIF |
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| 144 | ENDIF |
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| 145 | ENDIF |
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| 146 | |
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| 147 | vw = COS( alpha ) * betrag |
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| 148 | |
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| 149 | DO k = kc1, kc2 |
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| 150 | v(k,j,i) = v(k,j,i) + vw |
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| 151 | ENDDO |
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| 152 | ENDDO |
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| 153 | ENDDO |
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| 154 | |
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| 155 | ! |
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| 156 | !-- Exchange of boundary values for the velocities. |
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| 157 | CALL exchange_horiz( u, uxrp, 0 ) |
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| 158 | CALL exchange_horiz( v, 0, vynp ) |
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| 159 | ! |
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| 160 | !-- Make velocity field nondivergent. |
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| 161 | n_sor = nsor_ini |
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| 162 | CALL pres |
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| 163 | n_sor = nsor |
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| 164 | |
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| 165 | END SUBROUTINE init_rankine |
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