[1682] | 1 | !> @file timestep.f90 |
---|
[2000] | 2 | !------------------------------------------------------------------------------! |
---|
[2696] | 3 | ! This file is part of the PALM model system. |
---|
[1036] | 4 | ! |
---|
[2000] | 5 | ! PALM is free software: you can redistribute it and/or modify it under the |
---|
| 6 | ! terms of the GNU General Public License as published by the Free Software |
---|
| 7 | ! Foundation, either version 3 of the License, or (at your option) any later |
---|
| 8 | ! version. |
---|
[1036] | 9 | ! |
---|
| 10 | ! PALM is distributed in the hope that it will be useful, but WITHOUT ANY |
---|
| 11 | ! WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR |
---|
| 12 | ! A PARTICULAR PURPOSE. See the GNU General Public License for more details. |
---|
| 13 | ! |
---|
| 14 | ! You should have received a copy of the GNU General Public License along with |
---|
| 15 | ! PALM. If not, see <http://www.gnu.org/licenses/>. |
---|
| 16 | ! |
---|
[2101] | 17 | ! Copyright 1997-2017 Leibniz Universitaet Hannover |
---|
[2000] | 18 | !------------------------------------------------------------------------------! |
---|
[1036] | 19 | ! |
---|
[258] | 20 | ! Current revisions: |
---|
[866] | 21 | ! ------------------ |
---|
[1485] | 22 | ! |
---|
[2258] | 23 | ! |
---|
[1485] | 24 | ! Former revisions: |
---|
| 25 | ! ----------------- |
---|
| 26 | ! $Id: timestep.f90 2696 2017-12-14 17:12:51Z suehring $ |
---|
[2365] | 27 | ! Vertical grid nesting: Sync fine and coarse grid timestep (SadiqHuq) |
---|
| 28 | ! |
---|
| 29 | ! 2258 2017-06-08 07:55:13Z suehring |
---|
[2258] | 30 | ! Bugfix, add pre-preprocessor directives to enable non-parrallel mode |
---|
[1485] | 31 | ! |
---|
[2258] | 32 | ! 2168 2017-03-06 13:08:38Z suehring |
---|
| 33 | ! |
---|
[2131] | 34 | ! 2130 2017-01-24 16:25:39Z raasch |
---|
| 35 | ! bugfix: in case of nested runs the stop condition in case of too small |
---|
| 36 | ! timesteps is communicated to all parent/child processes, |
---|
| 37 | ! some formatting done |
---|
| 38 | ! |
---|
[2119] | 39 | ! 2118 2017-01-17 16:38:49Z raasch |
---|
| 40 | ! OpenACC directives and related part of code removed |
---|
| 41 | ! |
---|
[2001] | 42 | ! 2000 2016-08-20 18:09:15Z knoop |
---|
| 43 | ! Forced header and separation lines into 80 columns |
---|
| 44 | ! |
---|
[1851] | 45 | ! 1849 2016-04-08 11:33:18Z hoffmann |
---|
| 46 | ! Adapted for modularization of microphysics |
---|
[1852] | 47 | ! |
---|
[1683] | 48 | ! 1682 2015-10-07 23:56:08Z knoop |
---|
| 49 | ! Code annotations made doxygen readable |
---|
| 50 | ! |
---|
[1485] | 51 | ! 1484 2014-10-21 10:53:05Z kanani |
---|
[1484] | 52 | ! Changes due to new module structure of the plant canopy model: |
---|
| 53 | ! calculations and parameters related to the plant canopy model removed |
---|
| 54 | ! (the limitation of the canopy drag, i.e. that the canopy drag itself should |
---|
| 55 | ! not change the sign of the velocity components, is now assured for in the |
---|
| 56 | ! calculation of the canopy tendency terms in subroutine plant_canopy_model) |
---|
[1343] | 57 | ! |
---|
| 58 | ! 1342 2014-03-26 17:04:47Z kanani |
---|
| 59 | ! REAL constants defined as wp-kind |
---|
| 60 | ! |
---|
[1323] | 61 | ! 1322 2014-03-20 16:38:49Z raasch |
---|
| 62 | ! REAL functions provided with KIND-attribute |
---|
| 63 | ! |
---|
[1321] | 64 | ! 1320 2014-03-20 08:40:49Z raasch |
---|
[1320] | 65 | ! ONLY-attribute added to USE-statements, |
---|
| 66 | ! kind-parameters added to all INTEGER and REAL declaration statements, |
---|
| 67 | ! kinds are defined in new module kinds, |
---|
| 68 | ! old module precision_kind is removed, |
---|
| 69 | ! revision history before 2012 removed, |
---|
| 70 | ! comment fields (!:) to be used for variable explanations added to |
---|
| 71 | ! all variable declaration statements |
---|
[1321] | 72 | ! |
---|
[1258] | 73 | ! 1257 2013-11-08 15:18:40Z raasch |
---|
| 74 | ! openacc porting |
---|
| 75 | ! bugfix for calculation of advective timestep in case of vertically stretched |
---|
| 76 | ! grids |
---|
| 77 | ! |
---|
[1093] | 78 | ! 1092 2013-02-02 11:24:22Z raasch |
---|
| 79 | ! unused variables removed |
---|
| 80 | ! |
---|
[1054] | 81 | ! 1053 2012-11-13 17:11:03Z hoffmann |
---|
| 82 | ! timestep is reduced in two-moment cloud scheme according to the maximum |
---|
| 83 | ! terminal velocity of rain drops |
---|
| 84 | ! |
---|
[1037] | 85 | ! 1036 2012-10-22 13:43:42Z raasch |
---|
| 86 | ! code put under GPL (PALM 3.9) |
---|
| 87 | ! |
---|
[1002] | 88 | ! 1001 2012-09-13 14:08:46Z raasch |
---|
| 89 | ! all actions concerning leapfrog scheme removed |
---|
| 90 | ! |
---|
[979] | 91 | ! 978 2012-08-09 08:28:32Z fricke |
---|
| 92 | ! restriction of the outflow damping layer in the diffusion criterion removed |
---|
| 93 | ! |
---|
[867] | 94 | ! 866 2012-03-28 06:44:41Z raasch |
---|
| 95 | ! bugfix for timestep calculation in case of Galilei transformation, |
---|
| 96 | ! special treatment in case of mirror velocity boundary condition removed |
---|
| 97 | ! |
---|
[1] | 98 | ! Revision 1.1 1997/08/11 06:26:19 raasch |
---|
| 99 | ! Initial revision |
---|
| 100 | ! |
---|
| 101 | ! |
---|
| 102 | ! Description: |
---|
| 103 | ! ------------ |
---|
[1682] | 104 | !> Compute the time step under consideration of the FCL and diffusion criterion. |
---|
[1] | 105 | !------------------------------------------------------------------------------! |
---|
[1682] | 106 | SUBROUTINE timestep |
---|
| 107 | |
---|
[1] | 108 | |
---|
[1320] | 109 | USE arrays_3d, & |
---|
[1484] | 110 | ONLY: dzu, dzw, kh, km, u, v, w |
---|
[1320] | 111 | |
---|
| 112 | USE control_parameters, & |
---|
| 113 | ONLY: cfl_factor, coupling_mode, dt_3d, dt_fixed, dt_max, & |
---|
[1484] | 114 | galilei_transformation, old_dt, message_string, & |
---|
[1320] | 115 | stop_dt, terminate_coupled, terminate_coupled_remote, & |
---|
| 116 | timestep_reason, u_gtrans, use_ug_for_galilei_tr, v_gtrans |
---|
| 117 | |
---|
| 118 | USE cpulog, & |
---|
| 119 | ONLY: cpu_log, log_point |
---|
| 120 | |
---|
| 121 | USE grid_variables, & |
---|
| 122 | ONLY: dx, dx2, dy, dy2 |
---|
| 123 | |
---|
| 124 | USE indices, & |
---|
| 125 | ONLY: nxl, nxlg, nxr, nxrg, nyn, nyng, nys, nysg, nzb, nzt |
---|
| 126 | |
---|
[1] | 127 | USE interfaces |
---|
[1320] | 128 | |
---|
| 129 | USE kinds |
---|
| 130 | |
---|
[1849] | 131 | USE microphysics_mod, & |
---|
| 132 | ONLY: dt_precipitation |
---|
| 133 | |
---|
[1] | 134 | USE pegrid |
---|
| 135 | |
---|
[2130] | 136 | USE pmc_interface, & |
---|
| 137 | ONLY: nested_run |
---|
| 138 | |
---|
[1320] | 139 | USE statistics, & |
---|
| 140 | ONLY: flow_statistics_called, hom, u_max, u_max_ijk, v_max, v_max_ijk,& |
---|
| 141 | w_max, w_max_ijk |
---|
| 142 | |
---|
[2365] | 143 | USE vertical_nesting_mod, & |
---|
| 144 | ONLY: vnested, vnest_timestep_sync |
---|
| 145 | |
---|
[1] | 146 | IMPLICIT NONE |
---|
| 147 | |
---|
[1682] | 148 | INTEGER(iwp) :: i !< |
---|
| 149 | INTEGER(iwp) :: j !< |
---|
| 150 | INTEGER(iwp) :: k !< |
---|
[1] | 151 | |
---|
[2130] | 152 | LOGICAL :: stop_dt_local !< local switch for controlling the time stepping |
---|
| 153 | |
---|
[1682] | 154 | REAL(wp) :: div !< |
---|
| 155 | REAL(wp) :: dt_diff !< |
---|
| 156 | REAL(wp) :: dt_diff_l !< |
---|
| 157 | REAL(wp) :: dt_u !< |
---|
| 158 | REAL(wp) :: dt_u_l !< |
---|
| 159 | REAL(wp) :: dt_v !< |
---|
| 160 | REAL(wp) :: dt_v_l !< |
---|
| 161 | REAL(wp) :: dt_w !< |
---|
| 162 | REAL(wp) :: dt_w_l !< |
---|
| 163 | REAL(wp) :: u_gtrans_l !< |
---|
| 164 | REAL(wp) :: u_max_l !< |
---|
| 165 | REAL(wp) :: u_min_l !< |
---|
| 166 | REAL(wp) :: value !< |
---|
| 167 | REAL(wp) :: v_gtrans_l !< |
---|
| 168 | REAL(wp) :: v_max_l !< |
---|
| 169 | REAL(wp) :: v_min_l !< |
---|
| 170 | REAL(wp) :: w_max_l !< |
---|
| 171 | REAL(wp) :: w_min_l !< |
---|
[1320] | 172 | |
---|
[1682] | 173 | REAL(wp), DIMENSION(2) :: uv_gtrans !< |
---|
| 174 | REAL(wp), DIMENSION(2) :: uv_gtrans_l !< |
---|
| 175 | REAL(wp), DIMENSION(3) :: reduce !< |
---|
| 176 | REAL(wp), DIMENSION(3) :: reduce_l !< |
---|
| 177 | REAL(wp), DIMENSION(nzb+1:nzt) :: dxyz2_min !< |
---|
[1] | 178 | |
---|
| 179 | |
---|
[667] | 180 | |
---|
[1] | 181 | CALL cpu_log( log_point(12), 'calculate_timestep', 'start' ) |
---|
| 182 | |
---|
| 183 | ! |
---|
| 184 | !-- In case of Galilei-transform not using the geostrophic wind as translation |
---|
| 185 | !-- velocity, compute the volume-averaged horizontal velocity components, which |
---|
| 186 | !-- will then be subtracted from the horizontal wind for the time step and |
---|
| 187 | !-- horizontal advection routines. |
---|
| 188 | IF ( galilei_transformation .AND. .NOT. use_ug_for_galilei_tr ) THEN |
---|
| 189 | IF ( flow_statistics_called ) THEN |
---|
| 190 | ! |
---|
| 191 | !-- Horizontal averages already existent, just need to average them |
---|
| 192 | !-- vertically. |
---|
[1342] | 193 | u_gtrans = 0.0_wp |
---|
| 194 | v_gtrans = 0.0_wp |
---|
[1] | 195 | DO k = nzb+1, nzt |
---|
| 196 | u_gtrans = u_gtrans + hom(k,1,1,0) |
---|
| 197 | v_gtrans = v_gtrans + hom(k,1,2,0) |
---|
| 198 | ENDDO |
---|
[1322] | 199 | u_gtrans = u_gtrans / REAL( nzt - nzb, KIND=wp ) |
---|
| 200 | v_gtrans = v_gtrans / REAL( nzt - nzb, KIND=wp ) |
---|
[1] | 201 | ELSE |
---|
| 202 | ! |
---|
| 203 | !-- Averaging over the entire model domain. |
---|
[1342] | 204 | u_gtrans_l = 0.0_wp |
---|
| 205 | v_gtrans_l = 0.0_wp |
---|
[1] | 206 | DO i = nxl, nxr |
---|
| 207 | DO j = nys, nyn |
---|
| 208 | DO k = nzb+1, nzt |
---|
[1257] | 209 | u_gtrans_l = u_gtrans_l + u(k,j,i) |
---|
| 210 | v_gtrans_l = v_gtrans_l + v(k,j,i) |
---|
[1] | 211 | ENDDO |
---|
| 212 | ENDDO |
---|
| 213 | ENDDO |
---|
[2130] | 214 | uv_gtrans_l(1) = u_gtrans_l / & |
---|
| 215 | REAL( (nxr-nxl+1)*(nyn-nys+1)*(nzt-nzb), KIND=wp ) |
---|
| 216 | uv_gtrans_l(2) = v_gtrans_l / & |
---|
| 217 | REAL( (nxr-nxl+1)*(nyn-nys+1)*(nzt-nzb), KIND=wp ) |
---|
[1] | 218 | #if defined( __parallel ) |
---|
[622] | 219 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
---|
[2130] | 220 | CALL MPI_ALLREDUCE( uv_gtrans_l, uv_gtrans, 2, MPI_REAL, MPI_SUM, & |
---|
[1] | 221 | comm2d, ierr ) |
---|
[1322] | 222 | u_gtrans = uv_gtrans(1) / REAL( numprocs, KIND=wp ) |
---|
| 223 | v_gtrans = uv_gtrans(2) / REAL( numprocs, KIND=wp ) |
---|
[1] | 224 | #else |
---|
| 225 | u_gtrans = uv_gtrans_l(1) |
---|
| 226 | v_gtrans = uv_gtrans_l(2) |
---|
| 227 | #endif |
---|
| 228 | ENDIF |
---|
| 229 | ENDIF |
---|
| 230 | |
---|
[866] | 231 | ! |
---|
[1257] | 232 | !-- Determine the maxima of the velocity components, including their |
---|
| 233 | !-- grid index positions. |
---|
[1320] | 234 | CALL global_min_max( nzb, nzt+1, nysg, nyng, nxlg, nxrg, u, 'abs', 0.0_wp, & |
---|
[866] | 235 | u_max, u_max_ijk ) |
---|
[1320] | 236 | CALL global_min_max( nzb, nzt+1, nysg, nyng, nxlg, nxrg, v, 'abs', 0.0_wp, & |
---|
[866] | 237 | v_max, v_max_ijk ) |
---|
[1320] | 238 | CALL global_min_max( nzb, nzt+1, nysg, nyng, nxlg, nxrg, w, 'abs', 0.0_wp, & |
---|
[866] | 239 | w_max, w_max_ijk ) |
---|
| 240 | |
---|
[1257] | 241 | IF ( .NOT. dt_fixed ) THEN |
---|
[866] | 242 | ! |
---|
[1257] | 243 | !-- Variable time step: |
---|
| 244 | !-- Calculate the maximum time step according to the CFL-criterion, |
---|
| 245 | !-- individually for each velocity component |
---|
[1342] | 246 | dt_u_l = 999999.9_wp |
---|
| 247 | dt_v_l = 999999.9_wp |
---|
| 248 | dt_w_l = 999999.9_wp |
---|
[1257] | 249 | DO i = nxl, nxr |
---|
| 250 | DO j = nys, nyn |
---|
| 251 | DO k = nzb+1, nzt |
---|
[2130] | 252 | dt_u_l = MIN( dt_u_l, ( dx / & |
---|
| 253 | ( ABS( u(k,j,i) - u_gtrans ) + 1.0E-10_wp ) ) ) |
---|
| 254 | dt_v_l = MIN( dt_v_l, ( dy / & |
---|
| 255 | ( ABS( v(k,j,i) - v_gtrans ) + 1.0E-10_wp ) ) ) |
---|
| 256 | dt_w_l = MIN( dt_w_l, ( dzu(k) / & |
---|
| 257 | ( ABS( w(k,j,i) ) + 1.0E-10_wp ) ) ) |
---|
[1257] | 258 | ENDDO |
---|
| 259 | ENDDO |
---|
| 260 | ENDDO |
---|
[1] | 261 | |
---|
[1257] | 262 | #if defined( __parallel ) |
---|
| 263 | reduce_l(1) = dt_u_l |
---|
| 264 | reduce_l(2) = dt_v_l |
---|
| 265 | reduce_l(3) = dt_w_l |
---|
| 266 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
---|
| 267 | CALL MPI_ALLREDUCE( reduce_l, reduce, 3, MPI_REAL, MPI_MIN, comm2d, ierr ) |
---|
| 268 | dt_u = reduce(1) |
---|
| 269 | dt_v = reduce(2) |
---|
| 270 | dt_w = reduce(3) |
---|
| 271 | #else |
---|
| 272 | dt_u = dt_u_l |
---|
| 273 | dt_v = dt_v_l |
---|
| 274 | dt_w = dt_w_l |
---|
| 275 | #endif |
---|
| 276 | |
---|
[1] | 277 | ! |
---|
| 278 | !-- Compute time step according to the diffusion criterion. |
---|
| 279 | !-- First calculate minimum grid spacing which only depends on index k |
---|
[1342] | 280 | dt_diff_l = 999999.0_wp |
---|
[1] | 281 | |
---|
| 282 | DO k = nzb+1, nzt |
---|
[1342] | 283 | dxyz2_min(k) = MIN( dx2, dy2, dzw(k)*dzw(k) ) * 0.125_wp |
---|
[1] | 284 | ENDDO |
---|
| 285 | |
---|
[2118] | 286 | !$OMP PARALLEL private(i,j,k,value) reduction(MIN: dt_diff_l) |
---|
| 287 | !$OMP DO |
---|
[1] | 288 | DO i = nxl, nxr |
---|
| 289 | DO j = nys, nyn |
---|
| 290 | DO k = nzb+1, nzt |
---|
[2130] | 291 | dt_diff_l = MIN( dt_diff_l, dxyz2_min(k) / & |
---|
| 292 | ( MAX( kh(k,j,i), km(k,j,i) ) + 1E-20_wp ) ) |
---|
[1] | 293 | ENDDO |
---|
| 294 | ENDDO |
---|
| 295 | ENDDO |
---|
[2118] | 296 | !$OMP END PARALLEL |
---|
[1] | 297 | #if defined( __parallel ) |
---|
[622] | 298 | IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) |
---|
[2130] | 299 | CALL MPI_ALLREDUCE( dt_diff_l, dt_diff, 1, MPI_REAL, MPI_MIN, comm2d, & |
---|
[1] | 300 | ierr ) |
---|
| 301 | #else |
---|
| 302 | dt_diff = dt_diff_l |
---|
| 303 | #endif |
---|
| 304 | |
---|
| 305 | ! |
---|
[316] | 306 | !-- The time step is the minimum of the 3-4 components and the diffusion time |
---|
[1001] | 307 | !-- step minus a reduction (cfl_factor) to be on the safe side. |
---|
[1] | 308 | !-- The time step must not exceed the maximum allowed value. |
---|
[2130] | 309 | dt_3d = cfl_factor * MIN( dt_diff, dt_u, dt_v, dt_w, dt_precipitation ) |
---|
[1] | 310 | dt_3d = MIN( dt_3d, dt_max ) |
---|
| 311 | |
---|
| 312 | ! |
---|
| 313 | !-- Remember the restricting time step criterion for later output. |
---|
[1484] | 314 | IF ( MIN( dt_u, dt_v, dt_w ) < dt_diff ) THEN |
---|
[1] | 315 | timestep_reason = 'A' |
---|
| 316 | ELSE |
---|
| 317 | timestep_reason = 'D' |
---|
| 318 | ENDIF |
---|
| 319 | |
---|
| 320 | ! |
---|
| 321 | !-- Set flag if the time step becomes too small. |
---|
[1342] | 322 | IF ( dt_3d < ( 0.00001_wp * dt_max ) ) THEN |
---|
[1] | 323 | stop_dt = .TRUE. |
---|
[108] | 324 | |
---|
[2130] | 325 | WRITE( message_string, * ) 'Time step has reached minimum limit.', & |
---|
| 326 | '&dt = ', dt_3d, ' s Simulation is terminated.', & |
---|
| 327 | '&old_dt = ', old_dt, ' s', & |
---|
| 328 | '&dt_u = ', dt_u, ' s', & |
---|
| 329 | '&dt_v = ', dt_v, ' s', & |
---|
| 330 | '&dt_w = ', dt_w, ' s', & |
---|
| 331 | '&dt_diff = ', dt_diff, ' s', & |
---|
| 332 | '&u_max = ', u_max, ' m/s k=', u_max_ijk(1), & |
---|
| 333 | ' j=', u_max_ijk(2), ' i=', u_max_ijk(3), & |
---|
| 334 | '&v_max = ', v_max, ' m/s k=', v_max_ijk(1), & |
---|
| 335 | ' j=', v_max_ijk(2), ' i=', v_max_ijk(3), & |
---|
| 336 | '&w_max = ', w_max, ' m/s k=', w_max_ijk(1), & |
---|
[320] | 337 | ' j=', w_max_ijk(2), ' i=', w_max_ijk(3) |
---|
[258] | 338 | CALL message( 'timestep', 'PA0312', 0, 1, 0, 6, 0 ) |
---|
[108] | 339 | ! |
---|
| 340 | !-- In case of coupled runs inform the remote model of the termination |
---|
| 341 | !-- and its reason, provided the remote model has not already been |
---|
| 342 | !-- informed of another termination reason (terminate_coupled > 0) before. |
---|
[222] | 343 | #if defined( __parallel ) |
---|
[108] | 344 | IF ( coupling_mode /= 'uncoupled' .AND. terminate_coupled == 0 ) THEN |
---|
| 345 | terminate_coupled = 2 |
---|
[2130] | 346 | IF ( myid == 0 ) THEN |
---|
[667] | 347 | CALL MPI_SENDRECV( & |
---|
[2130] | 348 | terminate_coupled, 1, MPI_INTEGER, target_id, 0, & |
---|
| 349 | terminate_coupled_remote, 1, MPI_INTEGER, target_id, 0, & |
---|
[667] | 350 | comm_inter, status, ierr ) |
---|
| 351 | ENDIF |
---|
[2130] | 352 | CALL MPI_BCAST( terminate_coupled_remote, 1, MPI_INTEGER, 0, & |
---|
| 353 | comm2d, ierr) |
---|
[108] | 354 | ENDIF |
---|
[222] | 355 | #endif |
---|
[1] | 356 | ENDIF |
---|
| 357 | |
---|
| 358 | ! |
---|
[2130] | 359 | !-- In case of nested runs all parent/child processes have to terminate if |
---|
| 360 | !-- one process has set the stop flag, i.e. they need to set the stop flag |
---|
| 361 | !-- too. |
---|
| 362 | IF ( nested_run ) THEN |
---|
| 363 | stop_dt_local = stop_dt |
---|
[2258] | 364 | #if defined( __parallel ) |
---|
[2130] | 365 | CALL MPI_ALLREDUCE( stop_dt_local, stop_dt, 1, MPI_LOGICAL, MPI_LOR, & |
---|
| 366 | MPI_COMM_WORLD, ierr ) |
---|
[2258] | 367 | #endif |
---|
[2130] | 368 | ENDIF |
---|
| 369 | |
---|
| 370 | ! |
---|
[1001] | 371 | !-- Ensure a smooth value (two significant digits) of the timestep. |
---|
[1342] | 372 | div = 1000.0_wp |
---|
[1001] | 373 | DO WHILE ( dt_3d < div ) |
---|
[1342] | 374 | div = div / 10.0_wp |
---|
[1001] | 375 | ENDDO |
---|
[1342] | 376 | dt_3d = NINT( dt_3d * 100.0_wp / div ) * div / 100.0_wp |
---|
[1] | 377 | |
---|
| 378 | ! |
---|
[1001] | 379 | !-- Adjust the time step |
---|
| 380 | old_dt = dt_3d |
---|
[1] | 381 | |
---|
[1001] | 382 | ENDIF |
---|
[1] | 383 | |
---|
[2365] | 384 | ! |
---|
| 385 | !-- Vertical nesting: coarse and fine grid timestep has to be identical |
---|
| 386 | IF ( vnested ) CALL vnest_timestep_sync |
---|
| 387 | |
---|
[1] | 388 | CALL cpu_log( log_point(12), 'calculate_timestep', 'stop' ) |
---|
| 389 | |
---|
| 390 | END SUBROUTINE timestep |
---|