[97] | 1 | SUBROUTINE diffusivities( var, var_reference ) |
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[1] | 2 | |
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[1036] | 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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[484] | 20 | ! Current revisions: |
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[1] | 21 | ! ----------------- |
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[98] | 22 | ! |
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[1017] | 23 | ! |
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[98] | 24 | ! Former revisions: |
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| 25 | ! ----------------- |
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| 26 | ! $Id: diffusivities.f90 1036 2012-10-22 13:43:42Z raasch $ |
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| 27 | ! |
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[1017] | 28 | ! 1015 2012-09-27 09:23:24Z raasch |
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| 29 | ! OpenACC statements added + code changes required for GPU optimization, |
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| 30 | ! adjustment of mixing length to the Prandtl mixing length at first grid point |
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| 31 | ! above ground removed |
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| 32 | ! |
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[668] | 33 | ! 667 2010-12-23 12:06:00Z suehring/gryschka |
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| 34 | ! nxl-1, nxr+1, nys-1, nyn+1 replaced by nxlg, nxrg, nysg, nyng |
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| 35 | ! |
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[139] | 36 | ! 137 2007-11-28 08:50:10Z letzel |
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| 37 | ! Bugfix for summation of sums_l_l for flow_statistics |
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| 38 | ! Vertical scalar profiles now based on nzb_s_inner and ngp_2dh_s_inner. |
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| 39 | ! |
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[98] | 40 | ! 97 2007-06-21 08:23:15Z raasch |
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[94] | 41 | ! Adjustment of mixing length calculation for the ocean version. |
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| 42 | ! This is also a bugfix, because the height above the topography is now |
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| 43 | ! used instead of the height above level k=0. |
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[97] | 44 | ! theta renamed var, dpt_dz renamed dvar_dz, +new argument var_reference |
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| 45 | ! use_pt_reference renamed use_reference |
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[77] | 46 | ! |
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| 47 | ! 57 2007-03-09 12:05:41Z raasch |
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| 48 | ! Reference temperature pt_reference can be used in buoyancy term |
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| 49 | ! |
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[3] | 50 | ! RCS Log replace by Id keyword, revision history cleaned up |
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| 51 | ! |
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[1] | 52 | ! Revision 1.24 2006/04/26 12:16:26 raasch |
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| 53 | ! OpenMP optimization (+sums_l_l_t), sqrt_e must be private |
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| 54 | ! |
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| 55 | ! Revision 1.1 1997/09/19 07:41:10 raasch |
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| 56 | ! Initial revision |
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| 57 | ! |
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| 58 | ! |
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| 59 | ! Description: |
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| 60 | ! ------------ |
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| 61 | ! Computation of the turbulent diffusion coefficients for momentum and heat |
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| 62 | ! according to Prandtl-Kolmogorov |
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| 63 | !------------------------------------------------------------------------------! |
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| 64 | |
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| 65 | USE arrays_3d |
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| 66 | USE control_parameters |
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| 67 | USE grid_variables |
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| 68 | USE indices |
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| 69 | USE pegrid |
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| 70 | USE statistics |
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| 71 | |
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| 72 | IMPLICIT NONE |
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| 73 | |
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| 74 | INTEGER :: i, j, k, omp_get_thread_num, sr, tn |
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| 75 | |
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[1015] | 76 | REAL :: dvar_dz, l, ll, l_stable, sqrt_e, var_reference |
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[1] | 77 | |
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[667] | 78 | REAL :: var(nzb:nzt+1,nysg:nyng,nxlg:nxrg) |
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[97] | 79 | |
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[1] | 80 | |
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| 81 | ! |
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| 82 | !-- Default thread number in case of one thread |
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| 83 | tn = 0 |
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| 84 | |
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| 85 | ! |
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| 86 | !-- Initialization for calculation of the mixing length profile |
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| 87 | sums_l_l = 0.0 |
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| 88 | |
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| 89 | ! |
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| 90 | !-- Compute the turbulent diffusion coefficient for momentum |
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[1015] | 91 | !$OMP PARALLEL PRIVATE (dvar_dz,i,j,k,l,ll,l_stable,sqrt_e,sr,tn) |
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[1] | 92 | !$ tn = omp_get_thread_num() |
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| 93 | |
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[1015] | 94 | ! |
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| 95 | !-- Data declerations for accelerators |
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| 96 | !$acc data present( dd2zu, e, km, kh, l_grid, l_wall, nzb_s_inner, rif, var ) |
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| 97 | !$acc kernels |
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| 98 | |
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| 99 | ! |
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| 100 | !-- Introduce an optional minimum tke |
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| 101 | IF ( e_min > 0.0 ) THEN |
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| 102 | !$OMP DO |
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| 103 | !$acc loop |
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| 104 | DO i = nxlg, nxrg |
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| 105 | DO j = nysg, nyng |
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| 106 | !$acc loop vector( 32 ) |
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| 107 | DO k = 1, nzt |
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| 108 | IF ( k > nzb_s_inner(j,i) ) THEN |
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| 109 | e(k,j,i) = MAX( e(k,j,i), e_min ) |
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| 110 | ENDIF |
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| 111 | ENDDO |
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| 112 | ENDDO |
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| 113 | ENDDO |
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| 114 | ENDIF |
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| 115 | |
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[1] | 116 | !$OMP DO |
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[1015] | 117 | !$acc loop |
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[667] | 118 | DO i = nxlg, nxrg |
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| 119 | DO j = nysg, nyng |
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[1015] | 120 | !$acc loop vector( 32 ) |
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| 121 | DO k = 1, nzt |
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[1] | 122 | |
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[1015] | 123 | IF ( k > nzb_s_inner(j,i) ) THEN |
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[1] | 124 | |
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[1015] | 125 | sqrt_e = SQRT( e(k,j,i) ) |
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[1] | 126 | ! |
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[1015] | 127 | !-- Determine the mixing length |
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| 128 | dvar_dz = atmos_ocean_sign * & ! inverse effect of pt/rho gradient |
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| 129 | ( var(k+1,j,i) - var(k-1,j,i) ) * dd2zu(k) |
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| 130 | IF ( dvar_dz > 0.0 ) THEN |
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| 131 | IF ( use_reference ) THEN |
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| 132 | l_stable = 0.76 * sqrt_e / & |
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| 133 | SQRT( g / var_reference * dvar_dz ) + 1E-5 |
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| 134 | ELSE |
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| 135 | l_stable = 0.76 * sqrt_e / & |
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| 136 | SQRT( g / var(k,j,i) * dvar_dz ) + 1E-5 |
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| 137 | ENDIF |
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| 138 | ELSE |
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| 139 | l_stable = l_grid(k) |
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| 140 | ENDIF |
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[1] | 141 | ! |
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[1015] | 142 | !-- Adjustment of the mixing length |
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| 143 | IF ( wall_adjustment ) THEN |
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| 144 | l = MIN( l_wall(k,j,i), l_grid(k), l_stable ) |
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| 145 | ll = MIN( l_wall(k,j,i), l_grid(k) ) |
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[57] | 146 | ELSE |
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[1015] | 147 | l = MIN( l_grid(k), l_stable ) |
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| 148 | ll = l_grid(k) |
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[57] | 149 | ENDIF |
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[1015] | 150 | |
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| 151 | ! |
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| 152 | !-- Compute diffusion coefficients for momentum and heat |
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| 153 | km(k,j,i) = 0.1 * l * sqrt_e |
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| 154 | kh(k,j,i) = ( 1.0 + 2.0 * l / ll ) * km(k,j,i) |
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| 155 | |
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[1] | 156 | ENDIF |
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| 157 | |
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[1015] | 158 | #if ! defined( __openacc ) |
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[1] | 159 | ! |
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[1015] | 160 | !++ Statistics still have to be realized for accelerators |
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| 161 | !-- Summation for averaged profile (cf. flow_statistics) |
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| 162 | DO sr = 0, statistic_regions |
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| 163 | sums_l_l(k,sr,tn) = sums_l_l(k,sr,tn) + l * rmask(j,i,sr) |
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| 164 | ENDDO |
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| 165 | #endif |
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[1] | 166 | |
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| 167 | ENDDO |
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| 168 | ENDDO |
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| 169 | ENDDO |
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| 170 | |
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[1015] | 171 | #if ! defined( __openacc ) |
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| 172 | ! |
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| 173 | !++ Statistics still have to be realized for accelerators |
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[1] | 174 | sums_l_l(nzt+1,:,tn) = sums_l_l(nzt,:,tn) ! quasi boundary-condition for |
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[667] | 175 | ! data output |
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[1015] | 176 | #endif |
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[1] | 177 | !$OMP END PARALLEL |
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| 178 | |
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| 179 | ! |
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| 180 | !-- Set vertical boundary values (Neumann conditions both at bottom and top). |
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| 181 | !-- Horizontal boundary conditions at vertical walls are not set because |
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| 182 | !-- so far vertical walls require usage of a Prandtl-layer where the boundary |
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| 183 | !-- values of the diffusivities are not needed |
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| 184 | !$OMP PARALLEL DO |
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[1015] | 185 | !$acc loop |
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[667] | 186 | DO i = nxlg, nxrg |
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| 187 | DO j = nysg, nyng |
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[1] | 188 | km(nzb_s_inner(j,i),j,i) = km(nzb_s_inner(j,i)+1,j,i) |
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| 189 | km(nzt+1,j,i) = km(nzt,j,i) |
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| 190 | kh(nzb_s_inner(j,i),j,i) = kh(nzb_s_inner(j,i)+1,j,i) |
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| 191 | kh(nzt+1,j,i) = kh(nzt,j,i) |
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| 192 | ENDDO |
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| 193 | ENDDO |
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| 194 | |
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| 195 | ! |
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| 196 | !-- Set Neumann boundary conditions at the outflow boundaries in case of |
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| 197 | !-- non-cyclic lateral boundaries |
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| 198 | IF ( outflow_l ) THEN |
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| 199 | km(:,:,nxl-1) = km(:,:,nxl) |
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| 200 | kh(:,:,nxl-1) = kh(:,:,nxl) |
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| 201 | ENDIF |
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| 202 | IF ( outflow_r ) THEN |
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| 203 | km(:,:,nxr+1) = km(:,:,nxr) |
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| 204 | kh(:,:,nxr+1) = kh(:,:,nxr) |
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| 205 | ENDIF |
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| 206 | IF ( outflow_s ) THEN |
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| 207 | km(:,nys-1,:) = km(:,nys,:) |
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| 208 | kh(:,nys-1,:) = kh(:,nys,:) |
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| 209 | ENDIF |
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| 210 | IF ( outflow_n ) THEN |
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| 211 | km(:,nyn+1,:) = km(:,nyn,:) |
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| 212 | kh(:,nyn+1,:) = kh(:,nyn,:) |
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| 213 | ENDIF |
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| 214 | |
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[1015] | 215 | !$acc end kernels |
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| 216 | !$acc end data |
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[1] | 217 | |
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| 218 | END SUBROUTINE diffusivities |
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