Changeset 2118 for palm/trunk/SOURCE/diffusion_v.f90
- Timestamp:
- Jan 17, 2017 4:38:49 PM (7 years ago)
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- 1 edited
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palm/trunk/SOURCE/diffusion_v.f90 (modified) (5 diffs)
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palm/trunk/SOURCE/diffusion_v.f90
r2101 r2118 20 20 ! Current revisions: 21 21 ! ----------------- 22 ! 22 ! OpenACC version of subroutine removed 23 23 ! 24 24 ! Former revisions: … … 35 35 ! Module renamed (removed _mod) 36 36 ! 37 !38 37 ! 1850 2016-04-08 13:29:27Z maronga 39 38 ! Module renamed 40 !41 39 ! 42 40 ! 1740 2016-01-13 08:19:40Z raasch … … 92 90 93 91 PRIVATE 94 PUBLIC diffusion_v , diffusion_v_acc92 PUBLIC diffusion_v 95 93 96 94 INTERFACE diffusion_v … … 98 96 MODULE PROCEDURE diffusion_v_ij 99 97 END INTERFACE diffusion_v 100 101 INTERFACE diffusion_v_acc102 MODULE PROCEDURE diffusion_v_acc103 END INTERFACE diffusion_v_acc104 98 105 99 CONTAINS … … 275 269 ! Description: 276 270 ! ------------ 277 !> Call for all grid points - accelerator version278 !------------------------------------------------------------------------------!279 SUBROUTINE diffusion_v_acc280 281 USE arrays_3d, &282 ONLY: ddzu, ddzw, km, tend, u, v, vsws, vswst, w, &283 drho_air, rho_air_zw284 285 USE control_parameters, &286 ONLY: constant_top_momentumflux, topography, use_surface_fluxes, &287 use_top_fluxes288 289 USE grid_variables, &290 ONLY: ddx, ddy, ddy2, fxm, fxp, wall_v291 292 USE indices, &293 ONLY: i_left, i_right, j_north, j_south, nxl, nxr, nyn, nys, nzb, &294 nzb_diff_v, nzb_v_inner, nzb_v_outer, nzt, nzt_diff295 296 USE kinds297 298 IMPLICIT NONE299 300 INTEGER(iwp) :: i !<301 INTEGER(iwp) :: j !<302 INTEGER(iwp) :: k !<303 REAL(wp) :: kmxm !<304 REAL(wp) :: kmxp !<305 REAL(wp) :: kmzm !<306 REAL(wp) :: kmzp !<307 308 REAL(wp), DIMENSION(nzb:nzt+1,nys:nyn,nxl:nxr) :: vsus !<309 !$acc declare create ( vsus )310 311 !312 !-- First calculate horizontal momentum flux v'u' at vertical walls,313 !-- if neccessary314 IF ( topography /= 'flat' ) THEN315 CALL wall_fluxes_acc( vsus, 0.0_wp, 1.0_wp, 0.0_wp, 0.0_wp, &316 nzb_v_inner, nzb_v_outer, wall_v )317 ENDIF318 319 !$acc kernels present ( u, v, w, km, tend, vsws, vswst ) &320 !$acc present ( ddzu, ddzw, fxm, fxp, wall_v ) &321 !$acc present ( nzb_v_inner, nzb_v_outer, nzb_diff_v )322 DO i = i_left, i_right323 DO j = j_south, j_north324 !325 !-- Compute horizontal diffusion326 DO k = 1, nzt327 IF ( k > nzb_v_outer(j,i) ) THEN328 !329 !-- Interpolate eddy diffusivities on staggered gridpoints330 kmxp = 0.25_wp * &331 ( km(k,j,i)+km(k,j,i+1)+km(k,j-1,i)+km(k,j-1,i+1) )332 kmxm = 0.25_wp * &333 ( km(k,j,i)+km(k,j,i-1)+km(k,j-1,i)+km(k,j-1,i-1) )334 335 tend(k,j,i) = tend(k,j,i) &336 & + ( kmxp * ( v(k,j,i+1) - v(k,j,i) ) * ddx &337 & + kmxp * ( u(k,j,i+1) - u(k,j-1,i+1) ) * ddy &338 & - kmxm * ( v(k,j,i) - v(k,j,i-1) ) * ddx &339 & - kmxm * ( u(k,j,i) - u(k,j-1,i) ) * ddy &340 & ) * ddx &341 & + 2.0_wp * ( &342 & km(k,j,i) * ( v(k,j+1,i) - v(k,j,i) ) &343 & - km(k,j-1,i) * ( v(k,j,i) - v(k,j-1,i) ) &344 & ) * ddy2345 ENDIF346 ENDDO347 348 !349 !-- Wall functions at the left and right walls, respectively350 DO k = 1, nzt351 IF( k > nzb_v_inner(j,i) .AND. k <= nzb_v_outer(j,i) .AND. &352 wall_v(j,i) /= 0.0_wp ) THEN353 354 kmxp = 0.25_wp * &355 ( km(k,j,i)+km(k,j,i+1)+km(k,j-1,i)+km(k,j-1,i+1) )356 kmxm = 0.25_wp * &357 ( km(k,j,i)+km(k,j,i-1)+km(k,j-1,i)+km(k,j-1,i-1) )358 359 tend(k,j,i) = tend(k,j,i) &360 + 2.0_wp * ( &361 km(k,j,i) * ( v(k,j+1,i) - v(k,j,i) ) &362 - km(k,j-1,i) * ( v(k,j,i) - v(k,j-1,i) ) &363 ) * ddy2 &364 + ( fxp(j,i) * ( &365 kmxp * ( v(k,j,i+1) - v(k,j,i) ) * ddx &366 + kmxp * ( u(k,j,i+1) - u(k,j-1,i+1) ) * ddy &367 ) &368 - fxm(j,i) * ( &369 kmxm * ( v(k,j,i) - v(k,j,i-1) ) * ddx &370 + kmxm * ( u(k,j,i) - u(k,j-1,i) ) * ddy &371 ) &372 + wall_v(j,i) * vsus(k,j,i) &373 ) * ddx374 ENDIF375 ENDDO376 377 !378 !-- Compute vertical diffusion. In case of simulating a Prandtl379 !-- layer, index k starts at nzb_v_inner+2.380 DO k = 1, nzt_diff381 IF ( k >= nzb_diff_v(j,i) ) THEN382 !383 !-- Interpolate eddy diffusivities on staggered gridpoints384 kmzp = 0.25_wp * &385 ( km(k,j,i)+km(k+1,j,i)+km(k,j-1,i)+km(k+1,j-1,i) )386 kmzm = 0.25_wp * &387 ( km(k,j,i)+km(k-1,j,i)+km(k,j-1,i)+km(k-1,j-1,i) )388 389 tend(k,j,i) = tend(k,j,i) &390 & + ( kmzp * ( ( v(k+1,j,i) - v(k,j,i) ) * ddzu(k+1)&391 & + ( w(k,j,i) - w(k,j-1,i) ) * ddy &392 & ) * rho_air_zw(k) &393 & - kmzm * ( ( v(k,j,i) - v(k-1,j,i) ) * ddzu(k)&394 & + ( w(k-1,j,i) - w(k-1,j-1,i) ) * ddy &395 & ) * rho_air_zw(k-1) &396 & ) * ddzw(k) * drho_air(k)397 ENDIF398 ENDDO399 400 ENDDO401 ENDDO402 403 !404 !-- Vertical diffusion at the first grid point above the surface,405 !-- if the momentum flux at the bottom is given by the Prandtl law406 !-- or if it is prescribed by the user.407 !-- Difference quotient of the momentum flux is not formed over408 !-- half of the grid spacing (2.0*ddzw(k)) any more, since the409 !-- comparison with other (LES) models showed that the values of410 !-- the momentum flux becomes too large in this case.411 !-- The term containing w(k-1,..) (see above equation) is removed here412 !-- because the vertical velocity is assumed to be zero at the surface.413 IF ( use_surface_fluxes ) THEN414 415 DO i = i_left, i_right416 DO j = j_south, j_north417 418 k = nzb_v_inner(j,i)+1419 !420 !-- Interpolate eddy diffusivities on staggered gridpoints421 kmzp = 0.25_wp * &422 ( km(k,j,i)+km(k+1,j,i)+km(k,j-1,i)+km(k+1,j-1,i) )423 424 tend(k,j,i) = tend(k,j,i) &425 & + ( kmzp * ( ( v(k+1,j,i) - v(k,j,i) ) * ddzu(k+1) &426 & + ( w(k,j,i) - w(k,j-1,i) ) * ddy &427 & ) * rho_air_zw(k) &428 & - ( -vsws(j,i) ) &429 & ) * ddzw(k) * drho_air(k)430 ENDDO431 ENDDO432 433 ENDIF434 435 !436 !-- Vertical diffusion at the first gridpoint below the top boundary,437 !-- if the momentum flux at the top is prescribed by the user438 IF ( use_top_fluxes .AND. constant_top_momentumflux ) THEN439 440 k = nzt441 442 DO i = i_left, i_right443 DO j = j_south, j_north444 445 !446 !-- Interpolate eddy diffusivities on staggered gridpoints447 kmzm = 0.25_wp * &448 ( km(k,j,i)+km(k-1,j,i)+km(k,j-1,i)+km(k-1,j-1,i) )449 450 tend(k,j,i) = tend(k,j,i) &451 & + ( ( -vswst(j,i) ) &452 & - kmzm * ( ( v(k,j,i) - v(k-1,j,i) ) * ddzu(k) &453 & + ( w(k-1,j,i) - w(k-1,j-1,i) ) * ddy &454 & ) * rho_air_zw(k-1) &455 & ) * ddzw(k) * drho_air(k)456 ENDDO457 ENDDO458 459 ENDIF460 !$acc end kernels461 462 END SUBROUTINE diffusion_v_acc463 464 465 !------------------------------------------------------------------------------!466 ! Description:467 ! ------------468 271 !> Call for grid point i,j 469 272 !------------------------------------------------------------------------------!
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