| 1 | SUBROUTINE pres |
|---|
| 2 | |
|---|
| 3 | !------------------------------------------------------------------------------! |
|---|
| 4 | ! Actual revisions: |
|---|
| 5 | ! ----------------- |
|---|
| 6 | ! |
|---|
| 7 | ! |
|---|
| 8 | ! Former revisions: |
|---|
| 9 | ! ----------------- |
|---|
| 10 | ! $Id: pres.f90 198 2008-09-17 08:55:28Z heinze $ |
|---|
| 11 | ! |
|---|
| 12 | ! 151 2008-03-07 13:42:18Z raasch |
|---|
| 13 | ! Bugfix in volume flow control for non-cyclic boundary conditions |
|---|
| 14 | ! |
|---|
| 15 | ! 106 2007-08-16 14:30:26Z raasch |
|---|
| 16 | ! Volume flow conservation added for the remaining three outflow boundaries |
|---|
| 17 | ! |
|---|
| 18 | ! 85 2007-05-11 09:35:14Z raasch |
|---|
| 19 | ! Division through dt_3d replaced by multiplication of the inverse. |
|---|
| 20 | ! For performance optimisation, this is done in the loop calculating the |
|---|
| 21 | ! divergence instead of using a seperate loop. |
|---|
| 22 | ! |
|---|
| 23 | ! 75 2007-03-22 09:54:05Z raasch |
|---|
| 24 | ! Volume flow control for non-cyclic boundary conditions added (currently only |
|---|
| 25 | ! for the north boundary!!), 2nd+3rd argument removed from exchange horiz, |
|---|
| 26 | ! mean vertical velocity is removed in case of Neumann boundary conditions |
|---|
| 27 | ! both at the bottom and the top |
|---|
| 28 | ! |
|---|
| 29 | ! RCS Log replace by Id keyword, revision history cleaned up |
|---|
| 30 | ! |
|---|
| 31 | ! Revision 1.25 2006/04/26 13:26:12 raasch |
|---|
| 32 | ! OpenMP optimization (+localsum, threadsum) |
|---|
| 33 | ! |
|---|
| 34 | ! Revision 1.1 1997/07/24 11:24:44 raasch |
|---|
| 35 | ! Initial revision |
|---|
| 36 | ! |
|---|
| 37 | ! |
|---|
| 38 | ! Description: |
|---|
| 39 | ! ------------ |
|---|
| 40 | ! Compute the divergence of the provisional velocity field. Solve the Poisson |
|---|
| 41 | ! equation for the perturbation pressure. Compute the final velocities using |
|---|
| 42 | ! this perturbation pressure. Compute the remaining divergence. |
|---|
| 43 | !------------------------------------------------------------------------------! |
|---|
| 44 | |
|---|
| 45 | USE arrays_3d |
|---|
| 46 | USE constants |
|---|
| 47 | USE control_parameters |
|---|
| 48 | USE cpulog |
|---|
| 49 | USE grid_variables |
|---|
| 50 | USE indices |
|---|
| 51 | USE interfaces |
|---|
| 52 | USE pegrid |
|---|
| 53 | USE poisfft_mod |
|---|
| 54 | USE poisfft_hybrid_mod |
|---|
| 55 | USE statistics |
|---|
| 56 | |
|---|
| 57 | IMPLICIT NONE |
|---|
| 58 | |
|---|
| 59 | INTEGER :: i, j, k, sr |
|---|
| 60 | |
|---|
| 61 | REAL :: ddt_3d, localsum, threadsum |
|---|
| 62 | |
|---|
| 63 | REAL, DIMENSION(1:2) :: volume_flow_l, volume_flow_offset |
|---|
| 64 | REAL, DIMENSION(1:nzt) :: w_l, w_l_l |
|---|
| 65 | |
|---|
| 66 | |
|---|
| 67 | CALL cpu_log( log_point(8), 'pres', 'start' ) |
|---|
| 68 | |
|---|
| 69 | |
|---|
| 70 | ddt_3d = 1.0 / dt_3d |
|---|
| 71 | |
|---|
| 72 | ! |
|---|
| 73 | !-- Multigrid method needs additional grid points for the divergence array |
|---|
| 74 | IF ( psolver == 'multigrid' ) THEN |
|---|
| 75 | DEALLOCATE( d ) |
|---|
| 76 | ALLOCATE( d(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1) ) |
|---|
| 77 | ENDIF |
|---|
| 78 | |
|---|
| 79 | ! |
|---|
| 80 | !-- Conserve the volume flow at the outflow in case of non-cyclic lateral |
|---|
| 81 | !-- boundary conditions |
|---|
| 82 | !-- WARNING: so far, this conservation does not work at the left/south |
|---|
| 83 | !-- boundary if the topography at the inflow differs from that at the |
|---|
| 84 | !-- outflow! For this case, volume_flow_area needs adjustment! |
|---|
| 85 | ! |
|---|
| 86 | !-- Left/right |
|---|
| 87 | IF ( conserve_volume_flow .AND. ( outflow_l .OR. outflow_r ) ) THEN |
|---|
| 88 | |
|---|
| 89 | volume_flow(1) = 0.0 |
|---|
| 90 | volume_flow_l(1) = 0.0 |
|---|
| 91 | |
|---|
| 92 | IF ( outflow_l ) THEN |
|---|
| 93 | i = 0 |
|---|
| 94 | ELSEIF ( outflow_r ) THEN |
|---|
| 95 | i = nx+1 |
|---|
| 96 | ENDIF |
|---|
| 97 | |
|---|
| 98 | DO j = nys, nyn |
|---|
| 99 | ! |
|---|
| 100 | !-- Sum up the volume flow through the south/north boundary |
|---|
| 101 | DO k = nzb_2d(j,i) + 1, nzt |
|---|
| 102 | volume_flow_l(1) = volume_flow_l(1) + u(k,j,i) * dzu(k) |
|---|
| 103 | ENDDO |
|---|
| 104 | ENDDO |
|---|
| 105 | |
|---|
| 106 | #if defined( __parallel ) |
|---|
| 107 | CALL MPI_ALLREDUCE( volume_flow_l(1), volume_flow(1), 1, MPI_REAL, & |
|---|
| 108 | MPI_SUM, comm1dy, ierr ) |
|---|
| 109 | #else |
|---|
| 110 | volume_flow = volume_flow_l |
|---|
| 111 | #endif |
|---|
| 112 | volume_flow_offset(1) = ( volume_flow_initial(1) - volume_flow(1) ) & |
|---|
| 113 | / volume_flow_area(1) |
|---|
| 114 | |
|---|
| 115 | DO j = nys-1, nyn+1 |
|---|
| 116 | DO k = nzb_v_inner(j,i) + 1, nzt |
|---|
| 117 | u(k,j,i) = u(k,j,i) + volume_flow_offset(1) |
|---|
| 118 | ENDDO |
|---|
| 119 | ENDDO |
|---|
| 120 | |
|---|
| 121 | ENDIF |
|---|
| 122 | |
|---|
| 123 | ! |
|---|
| 124 | !-- South/north |
|---|
| 125 | IF ( conserve_volume_flow .AND. ( outflow_n .OR. outflow_s ) ) THEN |
|---|
| 126 | |
|---|
| 127 | volume_flow(2) = 0.0 |
|---|
| 128 | volume_flow_l(2) = 0.0 |
|---|
| 129 | |
|---|
| 130 | IF ( outflow_s ) THEN |
|---|
| 131 | j = 0 |
|---|
| 132 | ELSEIF ( outflow_n ) THEN |
|---|
| 133 | j = ny+1 |
|---|
| 134 | ENDIF |
|---|
| 135 | |
|---|
| 136 | DO i = nxl, nxr |
|---|
| 137 | ! |
|---|
| 138 | !-- Sum up the volume flow through the south/north boundary |
|---|
| 139 | DO k = nzb_2d(j,i) + 1, nzt |
|---|
| 140 | volume_flow_l(2) = volume_flow_l(2) + v(k,j,i) * dzu(k) |
|---|
| 141 | ENDDO |
|---|
| 142 | ENDDO |
|---|
| 143 | |
|---|
| 144 | #if defined( __parallel ) |
|---|
| 145 | CALL MPI_ALLREDUCE( volume_flow_l(2), volume_flow(2), 1, MPI_REAL, & |
|---|
| 146 | MPI_SUM, comm1dx, ierr ) |
|---|
| 147 | #else |
|---|
| 148 | volume_flow = volume_flow_l |
|---|
| 149 | #endif |
|---|
| 150 | volume_flow_offset(2) = ( volume_flow_initial(2) - volume_flow(2) ) & |
|---|
| 151 | / volume_flow_area(2) |
|---|
| 152 | |
|---|
| 153 | DO i = nxl-1, nxr+1 |
|---|
| 154 | DO k = nzb_v_inner(j,i) + 1, nzt |
|---|
| 155 | v(k,j,i) = v(k,j,i) + volume_flow_offset(2) |
|---|
| 156 | ENDDO |
|---|
| 157 | ENDDO |
|---|
| 158 | |
|---|
| 159 | ENDIF |
|---|
| 160 | |
|---|
| 161 | ! |
|---|
| 162 | !-- Remove mean vertical velocity |
|---|
| 163 | IF ( ibc_p_b == 1 .AND. ibc_p_t == 1 ) THEN |
|---|
| 164 | IF ( simulated_time > 0.0 ) THEN ! otherwise nzb_w_inner is not yet known |
|---|
| 165 | w_l = 0.0; w_l_l = 0.0 |
|---|
| 166 | DO i = nxl, nxr |
|---|
| 167 | DO j = nys, nyn |
|---|
| 168 | DO k = nzb_w_inner(j,i)+1, nzt |
|---|
| 169 | w_l_l(k) = w_l_l(k) + w(k,j,i) |
|---|
| 170 | ENDDO |
|---|
| 171 | ENDDO |
|---|
| 172 | ENDDO |
|---|
| 173 | #if defined( __parallel ) |
|---|
| 174 | CALL MPI_ALLREDUCE( w_l_l(1), w_l(1), nzt, MPI_REAL, MPI_SUM, comm2d, & |
|---|
| 175 | ierr ) |
|---|
| 176 | #else |
|---|
| 177 | w_l = w_l_l |
|---|
| 178 | #endif |
|---|
| 179 | DO k = 1, nzt |
|---|
| 180 | w_l(k) = w_l(k) / ngp_2dh_outer(k,0) |
|---|
| 181 | ENDDO |
|---|
| 182 | DO i = nxl-1, nxr+1 |
|---|
| 183 | DO j = nys-1, nyn+1 |
|---|
| 184 | DO k = nzb_w_inner(j,i)+1, nzt |
|---|
| 185 | w(k,j,i) = w(k,j,i) - w_l(k) |
|---|
| 186 | ENDDO |
|---|
| 187 | ENDDO |
|---|
| 188 | ENDDO |
|---|
| 189 | ENDIF |
|---|
| 190 | ENDIF |
|---|
| 191 | |
|---|
| 192 | ! |
|---|
| 193 | !-- Compute the divergence of the provisional velocity field. |
|---|
| 194 | CALL cpu_log( log_point_s(1), 'divergence', 'start' ) |
|---|
| 195 | |
|---|
| 196 | IF ( psolver == 'multigrid' ) THEN |
|---|
| 197 | !$OMP PARALLEL DO SCHEDULE( STATIC ) |
|---|
| 198 | DO i = nxl-1, nxr+1 |
|---|
| 199 | DO j = nys-1, nyn+1 |
|---|
| 200 | DO k = nzb, nzt+1 |
|---|
| 201 | d(k,j,i) = 0.0 |
|---|
| 202 | ENDDO |
|---|
| 203 | ENDDO |
|---|
| 204 | ENDDO |
|---|
| 205 | ELSE |
|---|
| 206 | !$OMP PARALLEL DO SCHEDULE( STATIC ) |
|---|
| 207 | DO i = nxl, nxra |
|---|
| 208 | DO j = nys, nyna |
|---|
| 209 | DO k = nzb+1, nzta |
|---|
| 210 | d(k,j,i) = 0.0 |
|---|
| 211 | ENDDO |
|---|
| 212 | ENDDO |
|---|
| 213 | ENDDO |
|---|
| 214 | ENDIF |
|---|
| 215 | |
|---|
| 216 | localsum = 0.0 |
|---|
| 217 | threadsum = 0.0 |
|---|
| 218 | |
|---|
| 219 | #if defined( __ibm ) |
|---|
| 220 | !$OMP PARALLEL PRIVATE (i,j,k) FIRSTPRIVATE(threadsum) REDUCTION(+:localsum) |
|---|
| 221 | !$OMP DO SCHEDULE( STATIC ) |
|---|
| 222 | DO i = nxl, nxr |
|---|
| 223 | DO j = nys, nyn |
|---|
| 224 | DO k = nzb_s_inner(j,i)+1, nzt |
|---|
| 225 | d(k,j,i) = ( ( u(k,j,i+1) - u(k,j,i) ) * ddx + & |
|---|
| 226 | ( v(k,j+1,i) - v(k,j,i) ) * ddy + & |
|---|
| 227 | ( w(k,j,i) - w(k-1,j,i) ) * ddzw(k) ) * ddt_3d |
|---|
| 228 | ENDDO |
|---|
| 229 | ! |
|---|
| 230 | !-- Additional pressure boundary condition at the bottom boundary for |
|---|
| 231 | !-- inhomogeneous Prandtl layer heat fluxes and temperatures, respectively |
|---|
| 232 | !-- dp/dz = -(dtau13/dx + dtau23/dy) + g*pt'/pt0. |
|---|
| 233 | !-- This condition must not be applied at the start of a run, because then |
|---|
| 234 | !-- flow_statistics has not yet been called and thus sums = 0. |
|---|
| 235 | IF ( ibc_p_b == 2 .AND. sums(nzb+1,4) /= 0.0 ) THEN |
|---|
| 236 | k = nzb_s_inner(j,i) |
|---|
| 237 | d(k+1,j,i) = d(k+1,j,i) + ( & |
|---|
| 238 | ( usws(j,i+1) - usws(j,i) ) * ddx & |
|---|
| 239 | + ( vsws(j+1,i) - vsws(j,i) ) * ddy & |
|---|
| 240 | - g * ( pt(k+1,j,i) - sums(k+1,4) ) / & |
|---|
| 241 | sums(k+1,4) & |
|---|
| 242 | ) * ddzw(k+1) * ddt_3d |
|---|
| 243 | ENDIF |
|---|
| 244 | |
|---|
| 245 | ! |
|---|
| 246 | !-- Compute possible PE-sum of divergences for flow_statistics |
|---|
| 247 | DO k = nzb_s_inner(j,i)+1, nzt |
|---|
| 248 | threadsum = threadsum + ABS( d(k,j,i) ) |
|---|
| 249 | ENDDO |
|---|
| 250 | |
|---|
| 251 | ENDDO |
|---|
| 252 | ENDDO |
|---|
| 253 | |
|---|
| 254 | localsum = ( localsum + threadsum ) * dt_3d |
|---|
| 255 | !$OMP END PARALLEL |
|---|
| 256 | #else |
|---|
| 257 | IF ( ibc_p_b == 2 .AND. sums(nzb+1,4) /= 0.0 ) THEN |
|---|
| 258 | !$OMP PARALLEL PRIVATE (i,j,k) |
|---|
| 259 | !$OMP DO SCHEDULE( STATIC ) |
|---|
| 260 | DO i = nxl, nxr |
|---|
| 261 | DO j = nys, nyn |
|---|
| 262 | DO k = nzb_s_inner(j,i)+1, nzt |
|---|
| 263 | d(k,j,i) = ( ( u(k,j,i+1) - u(k,j,i) ) * ddx + & |
|---|
| 264 | ( v(k,j+1,i) - v(k,j,i) ) * ddy + & |
|---|
| 265 | ( w(k,j,i) - w(k-1,j,i) ) * ddzw(k) ) * ddt_3d |
|---|
| 266 | ENDDO |
|---|
| 267 | ENDDO |
|---|
| 268 | ! |
|---|
| 269 | !-- Additional pressure boundary condition at the bottom boundary for |
|---|
| 270 | !-- inhomogeneous Prandtl layer heat fluxes and temperatures, respectively |
|---|
| 271 | !-- dp/dz = -(dtau13/dx + dtau23/dy) + g*pt'/pt0. |
|---|
| 272 | !-- This condition must not be applied at the start of a run, because then |
|---|
| 273 | !-- flow_statistics has not yet been called and thus sums = 0. |
|---|
| 274 | DO j = nys, nyn |
|---|
| 275 | k = nzb_s_inner(j,i) |
|---|
| 276 | d(k+1,j,i) = d(k+1,j,i) + ( & |
|---|
| 277 | ( usws(j,i+1) - usws(j,i) ) * ddx & |
|---|
| 278 | + ( vsws(j+1,i) - vsws(j,i) ) * ddy & |
|---|
| 279 | - g * ( pt(k+1,j,i) - sums(k+1,4) ) / & |
|---|
| 280 | sums(k+1,4) & |
|---|
| 281 | ) * ddzw(k+1) * ddt_3d |
|---|
| 282 | ENDDO |
|---|
| 283 | ENDDO |
|---|
| 284 | !$OMP END PARALLEL |
|---|
| 285 | |
|---|
| 286 | ELSE |
|---|
| 287 | |
|---|
| 288 | !$OMP PARALLEL PRIVATE (i,j,k) |
|---|
| 289 | !$OMP DO SCHEDULE( STATIC ) |
|---|
| 290 | DO i = nxl, nxr |
|---|
| 291 | DO j = nys, nyn |
|---|
| 292 | DO k = nzb_s_inner(j,i)+1, nzt |
|---|
| 293 | d(k,j,i) = ( ( u(k,j,i+1) - u(k,j,i) ) * ddx + & |
|---|
| 294 | ( v(k,j+1,i) - v(k,j,i) ) * ddy + & |
|---|
| 295 | ( w(k,j,i) - w(k-1,j,i) ) * ddzw(k) ) * ddt_3d |
|---|
| 296 | ENDDO |
|---|
| 297 | ENDDO |
|---|
| 298 | ENDDO |
|---|
| 299 | !$OMP END PARALLEL |
|---|
| 300 | |
|---|
| 301 | ENDIF |
|---|
| 302 | |
|---|
| 303 | ! |
|---|
| 304 | !-- Compute possible PE-sum of divergences for flow_statistics |
|---|
| 305 | !$OMP PARALLEL PRIVATE (i,j,k) FIRSTPRIVATE(threadsum) REDUCTION(+:localsum) |
|---|
| 306 | !$OMP DO SCHEDULE( STATIC ) |
|---|
| 307 | DO i = nxl, nxr |
|---|
| 308 | DO j = nys, nyn |
|---|
| 309 | DO k = nzb+1, nzt |
|---|
| 310 | threadsum = threadsum + ABS( d(k,j,i) ) |
|---|
| 311 | ENDDO |
|---|
| 312 | ENDDO |
|---|
| 313 | ENDDO |
|---|
| 314 | localsum = ( localsum + threadsum ) * dt_3d |
|---|
| 315 | !$OMP END PARALLEL |
|---|
| 316 | #endif |
|---|
| 317 | |
|---|
| 318 | ! |
|---|
| 319 | !-- For completeness, set the divergence sum of all statistic regions to those |
|---|
| 320 | !-- of the total domain |
|---|
| 321 | sums_divold_l(0:statistic_regions) = localsum |
|---|
| 322 | |
|---|
| 323 | ! |
|---|
| 324 | !-- Determine absolute minimum/maximum (only for test cases, therefore as |
|---|
| 325 | !-- comment line) |
|---|
| 326 | ! CALL global_min_max( nzb+1, nzt, nys, nyn, nxl, nxr, d, 'abs', divmax, & |
|---|
| 327 | ! divmax_ijk ) |
|---|
| 328 | |
|---|
| 329 | CALL cpu_log( log_point_s(1), 'divergence', 'stop' ) |
|---|
| 330 | |
|---|
| 331 | ! |
|---|
| 332 | !-- Compute the pressure perturbation solving the Poisson equation |
|---|
| 333 | IF ( psolver(1:7) == 'poisfft' ) THEN |
|---|
| 334 | |
|---|
| 335 | ! |
|---|
| 336 | !-- Enlarge the size of tend, used as a working array for the transpositions |
|---|
| 337 | IF ( nxra > nxr .OR. nyna > nyn .OR. nza > nz ) THEN |
|---|
| 338 | DEALLOCATE( tend ) |
|---|
| 339 | ALLOCATE( tend(1:nza,nys:nyna,nxl:nxra) ) |
|---|
| 340 | ENDIF |
|---|
| 341 | |
|---|
| 342 | ! |
|---|
| 343 | !-- Solve Poisson equation via FFT and solution of tridiagonal matrices |
|---|
| 344 | IF ( psolver == 'poisfft' ) THEN |
|---|
| 345 | ! |
|---|
| 346 | !-- Solver for 2d-decomposition |
|---|
| 347 | CALL poisfft( d, tend ) |
|---|
| 348 | ELSEIF ( psolver == 'poisfft_hybrid' ) THEN |
|---|
| 349 | ! |
|---|
| 350 | !-- Solver for 1d-decomposition (using MPI and OpenMP). |
|---|
| 351 | !-- The old hybrid-solver is still included here, as long as there |
|---|
| 352 | !-- are some optimization problems in poisfft |
|---|
| 353 | CALL poisfft_hybrid( d ) |
|---|
| 354 | ENDIF |
|---|
| 355 | |
|---|
| 356 | ! |
|---|
| 357 | !-- Resize tend to its normal size |
|---|
| 358 | IF ( nxra > nxr .OR. nyna > nyn .OR. nza > nz ) THEN |
|---|
| 359 | DEALLOCATE( tend ) |
|---|
| 360 | ALLOCATE( tend(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1) ) |
|---|
| 361 | ENDIF |
|---|
| 362 | |
|---|
| 363 | ! |
|---|
| 364 | !-- Store computed perturbation pressure and set boundary condition in |
|---|
| 365 | !-- z-direction |
|---|
| 366 | !$OMP PARALLEL DO |
|---|
| 367 | DO i = nxl, nxr |
|---|
| 368 | DO j = nys, nyn |
|---|
| 369 | DO k = nzb+1, nzt |
|---|
| 370 | tend(k,j,i) = d(k,j,i) |
|---|
| 371 | ENDDO |
|---|
| 372 | ENDDO |
|---|
| 373 | ENDDO |
|---|
| 374 | |
|---|
| 375 | ! |
|---|
| 376 | !-- Bottom boundary: |
|---|
| 377 | !-- This condition is only required for internal output. The pressure |
|---|
| 378 | !-- gradient (dp(nzb+1)-dp(nzb))/dz is not used anywhere else. |
|---|
| 379 | IF ( ibc_p_b == 1 ) THEN |
|---|
| 380 | ! |
|---|
| 381 | !-- Neumann (dp/dz = 0) |
|---|
| 382 | !$OMP PARALLEL DO |
|---|
| 383 | DO i = nxl-1, nxr+1 |
|---|
| 384 | DO j = nys-1, nyn+1 |
|---|
| 385 | tend(nzb_s_inner(j,i),j,i) = tend(nzb_s_inner(j,i)+1,j,i) |
|---|
| 386 | ENDDO |
|---|
| 387 | ENDDO |
|---|
| 388 | |
|---|
| 389 | ELSEIF ( ibc_p_b == 2 ) THEN |
|---|
| 390 | ! |
|---|
| 391 | !-- Neumann condition for inhomogeneous surfaces, |
|---|
| 392 | !-- here currently still in the form of a zero gradient. Actually |
|---|
| 393 | !-- dp/dz = -(dtau13/dx + dtau23/dy) + g*pt'/pt0 would have to be used for |
|---|
| 394 | !-- the computation (cf. above: computation of divergences). |
|---|
| 395 | !$OMP PARALLEL DO |
|---|
| 396 | DO i = nxl-1, nxr+1 |
|---|
| 397 | DO j = nys-1, nyn+1 |
|---|
| 398 | tend(nzb_s_inner(j,i),j,i) = tend(nzb_s_inner(j,i)+1,j,i) |
|---|
| 399 | ENDDO |
|---|
| 400 | ENDDO |
|---|
| 401 | |
|---|
| 402 | ELSE |
|---|
| 403 | ! |
|---|
| 404 | !-- Dirichlet |
|---|
| 405 | !$OMP PARALLEL DO |
|---|
| 406 | DO i = nxl-1, nxr+1 |
|---|
| 407 | DO j = nys-1, nyn+1 |
|---|
| 408 | tend(nzb_s_inner(j,i),j,i) = 0.0 |
|---|
| 409 | ENDDO |
|---|
| 410 | ENDDO |
|---|
| 411 | |
|---|
| 412 | ENDIF |
|---|
| 413 | |
|---|
| 414 | ! |
|---|
| 415 | !-- Top boundary |
|---|
| 416 | IF ( ibc_p_t == 1 ) THEN |
|---|
| 417 | ! |
|---|
| 418 | !-- Neumann |
|---|
| 419 | !$OMP PARALLEL DO |
|---|
| 420 | DO i = nxl-1, nxr+1 |
|---|
| 421 | DO j = nys-1, nyn+1 |
|---|
| 422 | tend(nzt+1,j,i) = tend(nzt,j,i) |
|---|
| 423 | ENDDO |
|---|
| 424 | ENDDO |
|---|
| 425 | |
|---|
| 426 | ELSE |
|---|
| 427 | ! |
|---|
| 428 | !-- Dirichlet |
|---|
| 429 | !$OMP PARALLEL DO |
|---|
| 430 | DO i = nxl-1, nxr+1 |
|---|
| 431 | DO j = nys-1, nyn+1 |
|---|
| 432 | tend(nzt+1,j,i) = 0.0 |
|---|
| 433 | ENDDO |
|---|
| 434 | ENDDO |
|---|
| 435 | |
|---|
| 436 | ENDIF |
|---|
| 437 | |
|---|
| 438 | ! |
|---|
| 439 | !-- Exchange boundaries for p |
|---|
| 440 | CALL exchange_horiz( tend ) |
|---|
| 441 | |
|---|
| 442 | ELSEIF ( psolver == 'sor' ) THEN |
|---|
| 443 | |
|---|
| 444 | ! |
|---|
| 445 | !-- Solve Poisson equation for perturbation pressure using SOR-Red/Black |
|---|
| 446 | !-- scheme |
|---|
| 447 | CALL sor( d, ddzu, ddzw, p ) |
|---|
| 448 | tend = p |
|---|
| 449 | |
|---|
| 450 | ELSEIF ( psolver == 'multigrid' ) THEN |
|---|
| 451 | |
|---|
| 452 | ! |
|---|
| 453 | !-- Solve Poisson equation for perturbation pressure using Multigrid scheme, |
|---|
| 454 | !-- array tend is used to store the residuals |
|---|
| 455 | CALL poismg( tend ) |
|---|
| 456 | |
|---|
| 457 | ! |
|---|
| 458 | !-- Restore perturbation pressure on tend because this array is used |
|---|
| 459 | !-- further below to correct the velocity fields |
|---|
| 460 | tend = p |
|---|
| 461 | |
|---|
| 462 | ENDIF |
|---|
| 463 | |
|---|
| 464 | ! |
|---|
| 465 | !-- Store perturbation pressure on array p, used in the momentum equations |
|---|
| 466 | IF ( psolver(1:7) == 'poisfft' ) THEN |
|---|
| 467 | ! |
|---|
| 468 | !-- Here, only the values from the left and right boundaries are copied |
|---|
| 469 | !-- The remaining values are copied in the following loop due to speed |
|---|
| 470 | !-- optimization |
|---|
| 471 | !$OMP PARALLEL DO |
|---|
| 472 | DO j = nys-1, nyn+1 |
|---|
| 473 | DO k = nzb, nzt+1 |
|---|
| 474 | p(k,j,nxl-1) = tend(k,j,nxl-1) |
|---|
| 475 | p(k,j,nxr+1) = tend(k,j,nxr+1) |
|---|
| 476 | ENDDO |
|---|
| 477 | ENDDO |
|---|
| 478 | ENDIF |
|---|
| 479 | |
|---|
| 480 | ! |
|---|
| 481 | !-- Correction of the provisional velocities with the current perturbation |
|---|
| 482 | !-- pressure just computed |
|---|
| 483 | IF ( conserve_volume_flow .AND. & |
|---|
| 484 | ( bc_lr == 'cyclic' .OR. bc_ns == 'cyclic' ) ) THEN |
|---|
| 485 | volume_flow_l(1) = 0.0 |
|---|
| 486 | volume_flow_l(2) = 0.0 |
|---|
| 487 | ENDIF |
|---|
| 488 | !$OMP PARALLEL PRIVATE (i,j,k) |
|---|
| 489 | !$OMP DO |
|---|
| 490 | DO i = nxl, nxr |
|---|
| 491 | IF ( psolver(1:7) == 'poisfft' ) THEN |
|---|
| 492 | DO j = nys-1, nyn+1 |
|---|
| 493 | DO k = nzb, nzt+1 |
|---|
| 494 | p(k,j,i) = tend(k,j,i) |
|---|
| 495 | ENDDO |
|---|
| 496 | ENDDO |
|---|
| 497 | ENDIF |
|---|
| 498 | DO j = nys, nyn |
|---|
| 499 | DO k = nzb_w_inner(j,i)+1, nzt |
|---|
| 500 | w(k,j,i) = w(k,j,i) - dt_3d * & |
|---|
| 501 | ( tend(k+1,j,i) - tend(k,j,i) ) * ddzu(k+1) |
|---|
| 502 | ENDDO |
|---|
| 503 | DO k = nzb_u_inner(j,i)+1, nzt |
|---|
| 504 | u(k,j,i) = u(k,j,i) - dt_3d * ( tend(k,j,i) - tend(k,j,i-1) ) * ddx |
|---|
| 505 | ENDDO |
|---|
| 506 | DO k = nzb_v_inner(j,i)+1, nzt |
|---|
| 507 | v(k,j,i) = v(k,j,i) - dt_3d * ( tend(k,j,i) - tend(k,j-1,i) ) * ddy |
|---|
| 508 | ENDDO |
|---|
| 509 | |
|---|
| 510 | ! |
|---|
| 511 | !-- Sum up the volume flow through the right and north boundary |
|---|
| 512 | IF ( conserve_volume_flow .AND. bc_lr == 'cyclic' .AND. & |
|---|
| 513 | i == nx ) THEN |
|---|
| 514 | !$OMP CRITICAL |
|---|
| 515 | DO k = nzb_2d(j,i) + 1, nzt |
|---|
| 516 | volume_flow_l(1) = volume_flow_l(1) + u(k,j,i) * dzu(k) |
|---|
| 517 | ENDDO |
|---|
| 518 | !$OMP END CRITICAL |
|---|
| 519 | ENDIF |
|---|
| 520 | IF ( conserve_volume_flow .AND. bc_ns == 'cyclic' .AND. & |
|---|
| 521 | j == ny ) THEN |
|---|
| 522 | !$OMP CRITICAL |
|---|
| 523 | DO k = nzb_2d(j,i) + 1, nzt |
|---|
| 524 | volume_flow_l(2) = volume_flow_l(2) + v(k,j,i) * dzu(k) |
|---|
| 525 | ENDDO |
|---|
| 526 | !$OMP END CRITICAL |
|---|
| 527 | ENDIF |
|---|
| 528 | |
|---|
| 529 | ENDDO |
|---|
| 530 | ENDDO |
|---|
| 531 | !$OMP END PARALLEL |
|---|
| 532 | |
|---|
| 533 | ! |
|---|
| 534 | !-- Conserve the volume flow |
|---|
| 535 | IF ( conserve_volume_flow .AND. & |
|---|
| 536 | ( bc_lr == 'cyclic' .OR. bc_ns == 'cyclic' ) ) THEN |
|---|
| 537 | |
|---|
| 538 | #if defined( __parallel ) |
|---|
| 539 | CALL MPI_ALLREDUCE( volume_flow_l(1), volume_flow(1), 2, MPI_REAL, & |
|---|
| 540 | MPI_SUM, comm2d, ierr ) |
|---|
| 541 | #else |
|---|
| 542 | volume_flow = volume_flow_l |
|---|
| 543 | #endif |
|---|
| 544 | |
|---|
| 545 | volume_flow_offset = ( volume_flow_initial - volume_flow ) / & |
|---|
| 546 | volume_flow_area |
|---|
| 547 | |
|---|
| 548 | !$OMP PARALLEL PRIVATE (i,j,k) |
|---|
| 549 | !$OMP DO |
|---|
| 550 | DO i = nxl, nxr |
|---|
| 551 | DO j = nys, nyn |
|---|
| 552 | IF ( bc_lr == 'cyclic' ) THEN |
|---|
| 553 | DO k = nzb_u_inner(j,i) + 1, nzt |
|---|
| 554 | u(k,j,i) = u(k,j,i) + volume_flow_offset(1) |
|---|
| 555 | ENDDO |
|---|
| 556 | ENDIF |
|---|
| 557 | IF ( bc_ns == 'cyclic' ) THEN |
|---|
| 558 | DO k = nzb_v_inner(j,i) + 1, nzt |
|---|
| 559 | v(k,j,i) = v(k,j,i) + volume_flow_offset(2) |
|---|
| 560 | ENDDO |
|---|
| 561 | ENDIF |
|---|
| 562 | ENDDO |
|---|
| 563 | ENDDO |
|---|
| 564 | !$OMP END PARALLEL |
|---|
| 565 | |
|---|
| 566 | ENDIF |
|---|
| 567 | |
|---|
| 568 | ! |
|---|
| 569 | !-- Exchange of boundaries for the velocities |
|---|
| 570 | CALL exchange_horiz( u ) |
|---|
| 571 | CALL exchange_horiz( v ) |
|---|
| 572 | CALL exchange_horiz( w ) |
|---|
| 573 | |
|---|
| 574 | ! |
|---|
| 575 | !-- Compute the divergence of the corrected velocity field, |
|---|
| 576 | !-- a possible PE-sum is computed in flow_statistics |
|---|
| 577 | CALL cpu_log( log_point_s(1), 'divergence', 'start' ) |
|---|
| 578 | sums_divnew_l = 0.0 |
|---|
| 579 | |
|---|
| 580 | ! |
|---|
| 581 | !-- d must be reset to zero because it can contain nonzero values below the |
|---|
| 582 | !-- topography |
|---|
| 583 | IF ( topography /= 'flat' ) d = 0.0 |
|---|
| 584 | |
|---|
| 585 | localsum = 0.0 |
|---|
| 586 | threadsum = 0.0 |
|---|
| 587 | |
|---|
| 588 | !$OMP PARALLEL PRIVATE (i,j,k) FIRSTPRIVATE(threadsum) REDUCTION(+:localsum) |
|---|
| 589 | !$OMP DO SCHEDULE( STATIC ) |
|---|
| 590 | #if defined( __ibm ) |
|---|
| 591 | DO i = nxl, nxr |
|---|
| 592 | DO j = nys, nyn |
|---|
| 593 | DO k = nzb_s_inner(j,i)+1, nzt |
|---|
| 594 | d(k,j,i) = ( u(k,j,i+1) - u(k,j,i) ) * ddx + & |
|---|
| 595 | ( v(k,j+1,i) - v(k,j,i) ) * ddy + & |
|---|
| 596 | ( w(k,j,i) - w(k-1,j,i) ) * ddzw(k) |
|---|
| 597 | ENDDO |
|---|
| 598 | DO k = nzb+1, nzt |
|---|
| 599 | threadsum = threadsum + ABS( d(k,j,i) ) |
|---|
| 600 | ENDDO |
|---|
| 601 | ENDDO |
|---|
| 602 | ENDDO |
|---|
| 603 | #else |
|---|
| 604 | DO i = nxl, nxr |
|---|
| 605 | DO j = nys, nyn |
|---|
| 606 | DO k = nzb_s_inner(j,i)+1, nzt |
|---|
| 607 | d(k,j,i) = ( u(k,j,i+1) - u(k,j,i) ) * ddx + & |
|---|
| 608 | ( v(k,j+1,i) - v(k,j,i) ) * ddy + & |
|---|
| 609 | ( w(k,j,i) - w(k-1,j,i) ) * ddzw(k) |
|---|
| 610 | threadsum = threadsum + ABS( d(k,j,i) ) |
|---|
| 611 | ENDDO |
|---|
| 612 | ENDDO |
|---|
| 613 | ENDDO |
|---|
| 614 | #endif |
|---|
| 615 | localsum = localsum + threadsum |
|---|
| 616 | !$OMP END PARALLEL |
|---|
| 617 | |
|---|
| 618 | ! |
|---|
| 619 | !-- For completeness, set the divergence sum of all statistic regions to those |
|---|
| 620 | !-- of the total domain |
|---|
| 621 | sums_divnew_l(0:statistic_regions) = localsum |
|---|
| 622 | |
|---|
| 623 | CALL cpu_log( log_point_s(1), 'divergence', 'stop' ) |
|---|
| 624 | |
|---|
| 625 | CALL cpu_log( log_point(8), 'pres', 'stop' ) |
|---|
| 626 | |
|---|
| 627 | |
|---|
| 628 | END SUBROUTINE pres |
|---|
