!> @file poismg.f90 !--------------------------------------------------------------------------------------------------! ! This file is part of the PALM model system. ! ! PALM is free software: you can redistribute it and/or modify it under the terms of the GNU General ! Public License as published by the Free Software Foundation, either version 3 of the License, or ! (at your option) any later version. ! ! PALM is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the ! implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General ! Public License for more details. ! ! You should have received a copy of the GNU General Public License along with PALM. If not, see ! . ! ! Copyright 1997-2020 Leibniz Universitaet Hannover !--------------------------------------------------------------------------------------------------! ! ! ! Current revisions: ! ----------------- ! ! ! Former revisions: ! ----------------- ! $Id: poismg_mod.f90 4649 2020-08-25 12:11:17Z oliver.maas $ ! File re-formatted to follow the PALM coding standard ! ! ! 4457 2020-03-11 14:20:43Z raasch ! Use statement for exchange horiz added ! ! 4432 2020-02-28 07:43:21Z raasch ! Bugfix for previous revision (vector directive was changed by mistake) ! ! 4429 2020-02-27 15:24:30Z raasch ! Statement added to avoid compile error due to unused dummy argument ! Bugfix: cpp-directives added for serial mode ! ! 4360 2020-01-07 11:25:50Z suehring ! Corrected "Former revisions" section ! ! 3725 2019-02-07 10:11:02Z raasch ! Unused subroutine removed ! ! 3655 2019-01-07 16:51:22Z knoop ! Unnecessary check eliminated ! ! Following optimisations have been made: ! - Vectorisation (for Intel-CPUs) of the red-black algorithm by resorting array elements with even ! and odd indices ! - Explicit boundary conditions for building walls removed (solver is running through the ! buildings) ! - Reduced data transfer in case of ghost point exchange, because only "red" or "black" data points ! need to be exchanged. This is not applied for coarser grid levels, since for then the transfer ! time is latency bound ! ! !--------------------------------------------------------------------------------------------------! ! Description: ! ------------ !> Solves the Poisson equation for the perturbation pressure with a multigrid V- or W-Cycle scheme. !> !> This multigrid method was originally developed for PALM by Joerg Uhlenbrock, !> September 2000 - July 2001. It has been optimised for speed by Klaus Ketelsen in November 2014. !> !> @attention Loop unrolling and cache optimization in SOR-Red/Black method still does not give the ! expected speedup! !> !> @todo Further work required. !--------------------------------------------------------------------------------------------------! MODULE poismg_mod USE control_parameters, & ONLY: bc_dirichlet_l, & bc_dirichlet_n, & bc_dirichlet_r, & bc_dirichlet_s, & bc_radiation_l, & bc_radiation_n, & bc_radiation_r, & bc_radiation_s, & grid_level, & nesting_offline USE cpulog, & ONLY: cpu_log, & log_point_s USE exchange_horiz_mod, & ONLY: exchange_horiz USE kinds USE pegrid PRIVATE INTEGER, SAVE :: ind_even_odd !< border index between even and odd k index INTEGER, DIMENSION(:), SAVE, ALLOCATABLE :: even_odd_level !< stores ind_even_odd for all MG levels REAL(wp), DIMENSION(:,:), SAVE, ALLOCATABLE :: f1_mg_b, f2_mg_b, f3_mg_b !< blocked version of f1_mg ... INTERFACE poismg MODULE PROCEDURE poismg END INTERFACE poismg INTERFACE sort_k_to_even_odd_blocks MODULE PROCEDURE sort_k_to_even_odd_blocks ! MODULE PROCEDURE sort_k_to_even_odd_blocks_int MODULE PROCEDURE sort_k_to_even_odd_blocks_1d END INTERFACE sort_k_to_even_odd_blocks PUBLIC poismg CONTAINS !--------------------------------------------------------------------------------------------------! ! Description: ! ------------ !> Solves the Poisson equation for the perturbation pressure with a multigrid V- or W-Cycle scheme. !--------------------------------------------------------------------------------------------------! SUBROUTINE poismg( r ) USE arrays_3d, & ONLY: d, & p_loc USE control_parameters, & ONLY: bc_lr_cyc, & bc_ns_cyc, & gathered_size, & grid_level, & grid_level_count, & ibc_p_t, & maximum_grid_level, & message_string, & mgcycles, & mg_cycles, & mg_switch_to_pe0_level, & residual_limit, & subdomain_size USE cpulog, & ONLY: cpu_log, & log_point_s USE indices, & ONLY: nxl, & nxlg, & nxl_mg, & nxr, & nxrg, & nxr_mg, & nys, & nysg, & nys_mg, & nyn, & nyng, & nyn_mg, & nzb, & nzt, & nzt_mg IMPLICIT NONE REAL(wp) :: maxerror !< REAL(wp) :: maximum_mgcycles !< REAL(wp) :: residual_norm !< REAL(wp), DIMENSION(nzb:nzt+1,nys-1:nyn+1,nxl-1:nxr+1) :: r !< REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: p3 !< CALL cpu_log( log_point_s(29), 'poismg', 'start' ) ! !-- Initialize arrays and variables used in this subroutine !-- If the number of grid points of the gathered grid, which is collected on PE0, is larger than the !-- number of grid points of a PE, than array p3 will be enlarged. IF ( gathered_size > subdomain_size ) THEN ALLOCATE( p3(nzb:nzt_mg(mg_switch_to_pe0_level)+1,nys_mg( & mg_switch_to_pe0_level)-1:nyn_mg(mg_switch_to_pe0_level)+1, & nxl_mg(mg_switch_to_pe0_level)-1:nxr_mg(mg_switch_to_pe0_level)+1) ) ELSE ALLOCATE ( p3(nzb:nzt+1,nysg:nyng,nxlg:nxrg) ) ENDIF p3 = 0.0_wp ! !-- Ghost boundaries have to be added to divergence array. !-- Exchange routine needs to know the grid level! grid_level = maximum_grid_level CALL exchange_horiz( d, 1) ! !-- Set bottom and top boundary conditions d(nzb,:,:) = d(nzb+1,:,:) IF ( ibc_p_t == 1 ) d(nzt+1,:,: ) = d(nzt,:,:) ! !-- Set lateral boundary conditions in non-cyclic case IF ( .NOT. bc_lr_cyc ) THEN IF ( bc_dirichlet_l .OR. bc_radiation_l ) d(:,:,nxl-1) = d(:,:,nxl) IF ( bc_dirichlet_r .OR. bc_radiation_r ) d(:,:,nxr+1) = d(:,:,nxr) ENDIF IF ( .NOT. bc_ns_cyc ) THEN IF ( bc_dirichlet_n .OR. bc_radiation_n ) d(:,nyn+1,:) = d(:,nyn,:) IF ( bc_dirichlet_s .OR. bc_radiation_s ) d(:,nys-1,:) = d(:,nys,:) ENDIF ! !-- Initiation of the multigrid scheme. Does n cycles until the residual is smaller than the given !-- limit. The accuracy of the solution of the poisson equation will increase with the number of !-- cycles. If the number of cycles is preset by the user, this number will be carried out !-- regardless of the accuracy. grid_level_count = 0 mgcycles = 0 IF ( mg_cycles == -1 ) THEN maximum_mgcycles = 0 residual_norm = 1.0_wp ELSE maximum_mgcycles = mg_cycles residual_norm = 0.0_wp ENDIF ! !-- Initial settings for sorting k-dimension from sequential order (alternate even/odd) into blocks !-- of even and odd or vice versa CALL init_even_odd_blocks ! !-- Sort input arrays in even/odd blocks along k-dimension CALL sort_k_to_even_odd_blocks( d, grid_level ) CALL sort_k_to_even_odd_blocks( p_loc, grid_level ) ! !-- The complete multigrid cycles are running in block mode, i.e. over seperate data blocks of even !-- and odd indices DO WHILE ( residual_norm > residual_limit .OR. mgcycles < maximum_mgcycles ) CALL next_mg_level( d, p_loc, p3, r) ! !-- Calculate the residual if the user has not preset the number of cycles to be performed IF ( maximum_mgcycles == 0 ) THEN CALL resid( d, p_loc, r ) maxerror = SUM( r(nzb+1:nzt,nys:nyn,nxl:nxr)**2 ) #if defined( __parallel ) IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) CALL MPI_ALLREDUCE( maxerror, residual_norm, 1, MPI_REAL, MPI_SUM, comm2d, ierr) #else residual_norm = maxerror #endif residual_norm = SQRT( residual_norm ) ENDIF mgcycles = mgcycles + 1 ! !-- If the user has not limited the number of cycles, stop the run in case of insufficient !-- convergence IF ( mgcycles > 1000 .AND. mg_cycles == -1 ) THEN message_string = 'no sufficient convergence within 1000 cycles' CALL message( 'poismg', 'PA0283', 1, 2, 0, 6, 0 ) ENDIF ENDDO DEALLOCATE( p3 ) ! !-- Result has to be sorted back from even/odd blocks to sequential order CALL sort_k_to_sequential( p_loc ) ! !-- Unset the grid level. Variable is used to determine the MPI datatypes for ghost point exchange grid_level = 0 CALL cpu_log( log_point_s(29), 'poismg', 'stop' ) END SUBROUTINE poismg !--------------------------------------------------------------------------------------------------! ! Description: ! ------------ !> Computes the residual of the perturbation pressure. !--------------------------------------------------------------------------------------------------! SUBROUTINE resid( f_mg, p_mg, r ) USE arrays_3d, & ONLY: rho_air_mg USE control_parameters, & ONLY: bc_lr_cyc, & bc_ns_cyc, & ibc_p_b, & ibc_p_t USE grid_variables, & ONLY: ddx2_mg, & ddy2_mg USE indices, & ONLY: nxl_mg, & nxr_mg, & nys_mg, & nyn_mg, & nzb, & nzt_mg IMPLICIT NONE INTEGER(iwp) :: i !< index variable along x INTEGER(iwp) :: j !< index variable along y INTEGER(iwp) :: k !< index variable along z INTEGER(iwp) :: l !< index indicating grid level INTEGER(iwp) :: km1 !< index variable along z dimension (k-1) INTEGER(iwp) :: kp1 !< index variable along z dimension (k+1) REAL(wp), DIMENSION(nzb:nzt_mg(grid_level)+1,nys_mg(grid_level)-1:nyn_mg(grid_level)+1, & nxl_mg(grid_level)-1:nxr_mg(grid_level)+1) :: f_mg !< velocity divergence REAL(wp), DIMENSION(nzb:nzt_mg(grid_level)+1,nys_mg(grid_level)-1:nyn_mg(grid_level)+1, & nxl_mg(grid_level)-1:nxr_mg(grid_level)+1) :: p_mg !< perturbation pressure REAL(wp), DIMENSION(nzb:nzt_mg(grid_level)+1,nys_mg(grid_level)-1:nyn_mg(grid_level)+1, & nxl_mg(grid_level)-1:nxr_mg(grid_level)+1) :: r !< residuum of perturbation pressure ! !-- Calculate the residual l = grid_level CALL cpu_log( log_point_s(53), 'resid', 'start' ) !$OMP PARALLEL PRIVATE (i,j,k,km1,kp1) !$OMP DO DO i = nxl_mg(l), nxr_mg(l) DO j = nys_mg(l), nyn_mg(l) !DIR$ IVDEP DO k = ind_even_odd+1, nzt_mg(l) km1 = k-ind_even_odd-1 kp1 = k-ind_even_odd r(k,j,i) = f_mg(k,j,i) - rho_air_mg(k,l) * ddx2_mg(l) & * ( p_mg(k,j,i+1) + p_mg(k,j,i-1) ) & - rho_air_mg(k,l) * ddy2_mg(l) * ( p_mg(k,j+1,i) + p_mg(k,j-1,i) ) & - f2_mg_b(k,l) * p_mg(kp1,j,i) - f3_mg_b(k,l) * p_mg(km1,j,i) & + f1_mg_b(k,l) * p_mg(k,j,i) ENDDO !DIR$ IVDEP DO k = nzb+1, ind_even_odd km1 = k+ind_even_odd kp1 = k+ind_even_odd+1 r(k,j,i) = f_mg(k,j,i) - rho_air_mg(k,l) * ddx2_mg(l) & * ( p_mg(k,j,i+1) + p_mg(k,j,i-1) ) - rho_air_mg(k,l) * ddy2_mg(l) & * ( p_mg(k,j+1,i) + p_mg(k,j-1,i) ) - f2_mg_b(k,l) * p_mg(kp1,j,i) & - f3_mg_b(k,l) * p_mg(km1,j,i) + f1_mg_b(k,l) * p_mg(k,j,i) ENDDO ENDDO ENDDO !$OMP END PARALLEL ! !-- Horizontal boundary conditions CALL exchange_horiz( r, 1) IF ( .NOT. bc_lr_cyc ) THEN IF ( bc_dirichlet_l .OR. bc_radiation_l ) THEN r(:,:,nxl_mg(l)-1) = r(:,:,nxl_mg(l)) ENDIF IF ( bc_dirichlet_r .OR. bc_radiation_r ) THEN r(:,:,nxr_mg(l)+1) = r(:,:,nxr_mg(l)) ENDIF ENDIF IF ( .NOT. bc_ns_cyc ) THEN IF ( bc_dirichlet_n .OR. bc_radiation_n ) THEN r(:,nyn_mg(l)+1,:) = r(:,nyn_mg(l),:) ENDIF IF ( bc_dirichlet_s .OR. bc_radiation_s ) THEN r(:,nys_mg(l)-1,:) = r(:,nys_mg(l),:) ENDIF ENDIF ! !-- Boundary conditions at bottom and top of the domain. Points may be within buildings, but that !-- doesn't matter. IF ( ibc_p_b == 1 ) THEN ! !-- Equivalent to r(nzb,:,: ) = r(nzb+1,:,:) r(nzb,:,: ) = r(ind_even_odd+1,:,:) ELSE r(nzb,:,: ) = 0.0_wp ENDIF IF ( ibc_p_t == 1 ) THEN ! !-- Equivalent to r(nzt_mg(l)+1,:,: ) = r(nzt_mg(l),:,:) r(nzt_mg(l)+1,:,: ) = r(ind_even_odd,:,:) ELSE r(nzt_mg(l)+1,:,: ) = 0.0_wp ENDIF CALL cpu_log( log_point_s(53), 'resid', 'stop' ) END SUBROUTINE resid !--------------------------------------------------------------------------------------------------! ! Description: ! ------------ !> Interpolates the residual on the next coarser grid with "full weighting" scheme !--------------------------------------------------------------------------------------------------! SUBROUTINE restrict( f_mg, r ) USE control_parameters, & ONLY: bc_lr_cyc, & bc_ns_cyc, & ibc_p_b, & ibc_p_t USE indices, & ONLY: nxl_mg, & nxr_mg, & nys_mg, & nyn_mg, & nzb, & nzt_mg IMPLICIT NONE INTEGER(iwp) :: i !< index variable along x on finer grid INTEGER(iwp) :: ic !< index variable along x on coarser grid INTEGER(iwp) :: j !< index variable along y on finer grid INTEGER(iwp) :: jc !< index variable along y on coarser grid INTEGER(iwp) :: k !< index variable along z on finer grid INTEGER(iwp) :: kc !< index variable along z on coarser grid INTEGER(iwp) :: l !< index indicating finer grid level INTEGER(iwp) :: km1 !< index variable along z dimension (k-1 on finer level) INTEGER(iwp) :: kp1 !< index variable along z dimension (k+1 on finer level) REAL(wp), DIMENSION(nzb:nzt_mg(grid_level)+1,nys_mg(grid_level)-1:nyn_mg(grid_level)+1, & nxl_mg(grid_level)-1:nxr_mg(grid_level)+1) :: f_mg !< Residual on coarser grid level REAL(wp), DIMENSION(nzb:nzt_mg(grid_level+1)+1,nys_mg(grid_level+1)-1:nyn_mg(grid_level+1)+1, & nxl_mg(grid_level+1)-1:nxr_mg(grid_level+1)+1) :: r !< Residual on finer grid level ! !-- Interpolate the residual l = grid_level CALL cpu_log( log_point_s(54), 'restrict', 'start' ) ! !-- No wall treatment !$OMP PARALLEL PRIVATE (i,j,k,ic,jc,kc,km1,kp1) !$OMP DO SCHEDULE( STATIC ) DO ic = nxl_mg(l), nxr_mg(l) i = 2 * ic DO jc = nys_mg(l), nyn_mg(l) ! !-- Calculation for the first point along k j = 2 * jc ! !-- Calculation for the other points along k !DIR$ IVDEP DO k = ind_even_odd+1, nzt_mg(l+1) ! Fine grid at this point km1 = k-ind_even_odd-1 kp1 = k-ind_even_odd kc = k-ind_even_odd ! Coarse grid index f_mg(kc,jc,ic) = 1.0_wp / 64.0_wp & * ( 8.0_wp * r(k,j,i) + 4.0_wp * ( r(k,j,i-1) + r(k,j,i+1) & + r(k,j+1,i) + r(k,j-1,i) ) & + 2.0_wp * ( r(k,j-1,i-1) + r(k,j+1,i-1) & + r(k,j-1,i+1) + r(k,j+1,i+1) ) & + 4.0_wp * r(km1,j,i) & + 2.0_wp * ( r(km1,j,i-1) + r(km1,j,i+1) & + r(km1,j+1,i) + r(km1,j-1,i) ) & + ( r(km1,j-1,i-1) + r(km1,j+1,i-1) & + r(km1,j-1,i+1) + r(km1,j+1,i+1) ) & + 4.0_wp * r(kp1,j,i) & + 2.0_wp * ( r(kp1,j,i-1) + r(kp1,j,i+1) & + r(kp1,j+1,i) + r(kp1,j-1,i) ) & + ( r(kp1,j-1,i-1) + r(kp1,j+1,i-1) & + r(kp1,j-1,i+1) + r(kp1,j+1,i+1) ) & ) ENDDO ENDDO ENDDO !$OMP ENDDO !$OMP END PARALLEL ! !-- Ghost point exchange CALL exchange_horiz( f_mg, 1) ! !-- Horizontal boundary conditions IF ( .NOT. bc_lr_cyc ) THEN IF ( bc_dirichlet_l .OR. bc_radiation_l ) THEN f_mg(:,:,nxl_mg(l)-1) = f_mg(:,:,nxl_mg(l)) ENDIF IF ( bc_dirichlet_r .OR. bc_radiation_r ) THEN f_mg(:,:,nxr_mg(l)+1) = f_mg(:,:,nxr_mg(l)) ENDIF ENDIF IF ( .NOT. bc_ns_cyc ) THEN IF ( bc_dirichlet_n .OR. bc_radiation_n ) THEN f_mg(:,nyn_mg(l)+1,:) = f_mg(:,nyn_mg(l),:) ENDIF IF ( bc_dirichlet_s .OR. bc_radiation_s ) THEN f_mg(:,nys_mg(l)-1,:) = f_mg(:,nys_mg(l),:) ENDIF ENDIF ! !-- Boundary conditions at bottom and top of the domain. These points are not handled by the above !-- loop. Points may be within buildings, but that doesn't matter. Remark: f_mg is ordered !-- sequentielly after interpolation on coarse grid (is ordered in odd-even blocks further below). IF ( ibc_p_b == 1 ) THEN f_mg(nzb,:,: ) = f_mg(nzb+1,:,:) ELSE f_mg(nzb,:,: ) = 0.0_wp ENDIF IF ( ibc_p_t == 1 ) THEN f_mg(nzt_mg(l)+1,:,: ) = f_mg(nzt_mg(l),:,:) ELSE f_mg(nzt_mg(l)+1,:,: ) = 0.0_wp ENDIF CALL cpu_log( log_point_s(54), 'restrict', 'stop' ) ! !-- Since residual is in sequential order after interpolation, an additional sorting in odd-even !-- blocks along z dimension is required at this point. CALL sort_k_to_even_odd_blocks( f_mg , l) END SUBROUTINE restrict !--------------------------------------------------------------------------------------------------! ! Description: ! ------------ !> Interpolates the correction of the perturbation pressure to the next finer grid. !--------------------------------------------------------------------------------------------------! SUBROUTINE prolong( p, temp ) USE control_parameters, & ONLY: bc_lr_cyc, & bc_ns_cyc, & ibc_p_b, & ibc_p_t USE indices, & ONLY: nxl_mg, & nxr_mg, & nys_mg, & nyn_mg, & nzb, & nzt_mg IMPLICIT NONE INTEGER(iwp) :: i !< index variable along x on coarser grid level INTEGER(iwp) :: j !< index variable along y on coarser grid level INTEGER(iwp) :: k !< index variable along z on coarser grid level INTEGER(iwp) :: l !< index indicating finer grid level INTEGER(iwp) :: kp1 !< index variable along z INTEGER(iwp) :: ke !< index for prolog even INTEGER(iwp) :: ko !< index for prolog odd REAL(wp), DIMENSION(nzb:nzt_mg(grid_level-1)+1,nys_mg(grid_level-1)-1:nyn_mg(grid_level-1)+1, & nxl_mg(grid_level-1)-1:nxr_mg(grid_level-1)+1 ) :: p !< perturbation pressure on coarser grid level REAL(wp), DIMENSION(nzb:nzt_mg(grid_level)+1,nys_mg(grid_level)-1:nyn_mg(grid_level)+1, & nxl_mg(grid_level)-1:nxr_mg(grid_level)+1) :: temp !< perturbation pressure on finer grid level CALL cpu_log( log_point_s(55), 'prolong', 'start' ) ! !-- First, store elements of the coarser grid on the next finer grid l = grid_level ind_even_odd = even_odd_level(grid_level-1) !$OMP PARALLEL PRIVATE (i,j,k,kp1,ke,ko) !$OMP DO DO i = nxl_mg(l-1), nxr_mg(l-1) DO j = nys_mg(l-1), nyn_mg(l-1) !DIR$ IVDEP DO k = ind_even_odd+1, nzt_mg(l-1) kp1 = k - ind_even_odd ke = 2 * ( k-ind_even_odd - 1 ) + 1 ko = 2 * k - 1 ! !-- Points of the coarse grid are directly stored on the next finer grid temp(ko,2*j,2*i) = p(k,j,i) ! !-- Points between two coarse-grid points temp(ko,2*j,2*i+1) = 0.5_wp * ( p(k,j,i) + p(k,j,i+1) ) temp(ko,2*j+1,2*i) = 0.5_wp * ( p(k,j,i) + p(k,j+1,i) ) temp(ke,2*j,2*i) = 0.5_wp * ( p(k,j,i) + p(kp1,j,i) ) ! !-- Points in the center of the planes stretched by four points of the coarse grid cube temp(ko,2*j+1,2*i+1) = 0.25_wp * ( p(k,j,i) + p(k,j,i+1) + & p(k,j+1,i) + p(k,j+1,i+1) ) temp(ke,2*j,2*i+1) = 0.25_wp * ( p(k,j,i) + p(k,j,i+1) + & p(kp1,j,i) + p(kp1,j,i+1) ) temp(ke,2*j+1,2*i) = 0.25_wp * ( p(k,j,i) + p(k,j+1,i) + & p(kp1,j,i) + p(kp1,j+1,i) ) ! !-- Points in the middle of coarse grid cube temp(ke,2*j+1,2*i+1) = 0.125_wp * ( p(k,j,i) + p(k,j,i+1) + p(k,j+1,i) & + p(k,j+1,i+1) + p(kp1,j,i) + p(kp1,j,i+1) & + p(kp1,j+1,i) + p(kp1,j+1,i+1) ) ENDDO !DIR$ IVDEP DO k = nzb+1, ind_even_odd kp1 = k + ind_even_odd + 1 ke = 2 * k ko = 2 * ( k + ind_even_odd ) ! !-- Points of the coarse grid are directly stored on the next finer grid temp(ko,2*j,2*i) = p(k,j,i) ! !-- Points between two coarse-grid points temp(ko,2*j,2*i+1) = 0.5_wp * ( p(k,j,i) + p(k,j,i+1) ) temp(ko,2*j+1,2*i) = 0.5_wp * ( p(k,j,i) + p(k,j+1,i) ) temp(ke,2*j,2*i) = 0.5_wp * ( p(k,j,i) + p(kp1,j,i) ) ! !-- Points in the center of the planes stretched by four points !-- of the coarse grid cube temp(ko,2*j+1,2*i+1) = 0.25_wp * ( p(k,j,i) + p(k,j,i+1) + & p(k,j+1,i) + p(k,j+1,i+1) ) temp(ke,2*j,2*i+1) = 0.25_wp * ( p(k,j,i) + p(k,j,i+1) + & p(kp1,j,i) + p(kp1,j,i+1) ) temp(ke,2*j+1,2*i) = 0.25_wp * ( p(k,j,i) + p(k,j+1,i) + & p(kp1,j,i) + p(kp1,j+1,i) ) ! !-- Points in the middle of coarse grid cube temp(ke,2*j+1,2*i+1) = 0.125_wp * ( p(k,j,i) + p(k,j,i+1) + p(k,j+1,i) & + p(k,j+1,i+1) + p(kp1,j,i) + p(kp1,j,i+1) & + p(kp1,j+1,i) + p(kp1,j+1,i+1) ) ENDDO ENDDO ENDDO !$OMP END PARALLEL ind_even_odd = even_odd_level(grid_level) ! !-- Horizontal boundary conditions CALL exchange_horiz( temp, 1) IF ( .NOT. bc_lr_cyc ) THEN IF ( bc_dirichlet_l .OR. bc_radiation_l ) THEN temp(:,:,nxl_mg(l)-1) = temp(:,:,nxl_mg(l)) ENDIF IF ( bc_dirichlet_r .OR. bc_radiation_r ) THEN temp(:,:,nxr_mg(l)+1) = temp(:,:,nxr_mg(l)) ENDIF ENDIF IF ( .NOT. bc_ns_cyc ) THEN IF ( bc_dirichlet_n .OR. bc_radiation_n ) THEN temp(:,nyn_mg(l)+1,:) = temp(:,nyn_mg(l),:) ENDIF IF ( bc_dirichlet_s .OR. bc_radiation_s ) THEN temp(:,nys_mg(l)-1,:) = temp(:,nys_mg(l),:) ENDIF ENDIF ! !-- Bottom and top boundary conditions IF ( ibc_p_b == 1 ) THEN ! !-- Equivalent to temp(nzb,:,: ) = temp(nzb+1,:,:) temp(nzb,:,: ) = temp(ind_even_odd+1,:,:) ELSE temp(nzb,:,: ) = 0.0_wp ENDIF IF ( ibc_p_t == 1 ) THEN ! !-- Equivalent to temp(nzt_mg(l)+1,:,: ) = temp(nzt_mg(l),:,:) temp(nzt_mg(l)+1,:,: ) = temp(ind_even_odd,:,:) ELSE temp(nzt_mg(l)+1,:,: ) = 0.0_wp ENDIF CALL cpu_log( log_point_s(55), 'prolong', 'stop' ) END SUBROUTINE prolong !--------------------------------------------------------------------------------------------------! ! Description: ! ------------ !> Relaxation method for the multigrid scheme. A Gauss-Seidel iteration with 3D-Red-Black !> decomposition (GS-RB) is used. !--------------------------------------------------------------------------------------------------! SUBROUTINE redblack( f_mg, p_mg ) USE arrays_3d, & ONLY: rho_air_mg USE control_parameters, & ONLY: bc_lr_cyc, & bc_ns_cyc, & ibc_p_b, & ibc_p_t, & ngsrb USE grid_variables, & ONLY: ddx2_mg, & ddy2_mg USE indices, & ONLY: nxl_mg, & nxr_mg, & nys_mg, & nyn_mg, & nzb, & nzt_mg IMPLICIT NONE INTEGER(iwp) :: color !< grid point color, either red or black INTEGER(iwp) :: i !< index variable along x INTEGER(iwp) :: ic !< index variable along x INTEGER(iwp) :: j !< index variable along y INTEGER(iwp) :: jc !< index variable along y INTEGER(iwp) :: jj !< index variable along y INTEGER(iwp) :: k !< index variable along z INTEGER(iwp) :: km1 !< index variable (k-1) INTEGER(iwp) :: kp1 !< index variable (k+1) INTEGER(iwp) :: l !< grid level INTEGER(iwp) :: n !< loop variable Gauß-Seidel iterations LOGICAL :: unroll !< flag indicating whether loop unrolling is possible REAL(wp), DIMENSION(nzb:nzt_mg(grid_level)+1,nys_mg(grid_level)-1:nyn_mg(grid_level)+1, & nxl_mg(grid_level)-1:nxr_mg(grid_level)+1) :: f_mg !< residual of perturbation pressure REAL(wp), DIMENSION(nzb:nzt_mg(grid_level)+1,nys_mg(grid_level)-1:nyn_mg(grid_level)+1, & nxl_mg(grid_level)-1:nxr_mg(grid_level)+1) :: p_mg !< perturbation pressure l = grid_level unroll = ( MOD( nyn_mg(l)-nys_mg(l)+1, 4 ) == 0 .AND. MOD( nxr_mg(l)-nxl_mg(l)+1, 2 ) == 0 ) DO n = 1, ngsrb DO color = 1, 2 IF ( .NOT. unroll ) THEN CALL cpu_log( log_point_s(36), 'redblack_no_unroll_f', 'start' ) ! !-- Without unrolling of loops, no cache optimization !$OMP PARALLEL PRIVATE (i,j,k,km1,kp1) !$OMP DO DO i = nxl_mg(l), nxr_mg(l), 2 DO j = nys_mg(l) + 2 - color, nyn_mg(l), 2 !DIR$ IVDEP DO k = ind_even_odd+1, nzt_mg(l) km1 = k-ind_even_odd-1 kp1 = k-ind_even_odd p_mg(k,j,i) = 1.0_wp / f1_mg_b(k,l) & * ( rho_air_mg(k,l) * ddx2_mg(l) * & ( p_mg(k,j,i+1) + p_mg(k,j,i-1) ) & + rho_air_mg(k,l) * ddy2_mg(l) * & ( p_mg(k,j+1,i) + p_mg(k,j-1,i) ) & + f2_mg_b(k,l) * p_mg(kp1,j,i) & + f3_mg_b(k,l) * p_mg(km1,j,i) - f_mg(k,j,i) & ) ENDDO ENDDO ENDDO !$OMP DO DO i = nxl_mg(l)+1, nxr_mg(l), 2 DO j = nys_mg(l) + (color-1), nyn_mg(l), 2 !DIR$ IVDEP DO k = ind_even_odd+1, nzt_mg(l) km1 = k-ind_even_odd-1 kp1 = k-ind_even_odd p_mg(k,j,i) = 1.0_wp / f1_mg_b(k,l) * ( & rho_air_mg(k,l) * ddx2_mg(l) * & ( p_mg(k,j,i+1) + p_mg(k,j,i-1) ) & + rho_air_mg(k,l) * ddy2_mg(l) * & ( p_mg(k,j+1,i) + p_mg(k,j-1,i) ) & + f2_mg_b(k,l) * p_mg(kp1,j,i) & + f3_mg_b(k,l) * p_mg(km1,j,i) & - f_mg(k,j,i) ) ENDDO ENDDO ENDDO !$OMP DO DO i = nxl_mg(l), nxr_mg(l), 2 DO j = nys_mg(l) + (color-1), nyn_mg(l), 2 !DIR$ IVDEP DO k = nzb+1, ind_even_odd km1 = k+ind_even_odd kp1 = k+ind_even_odd+1 p_mg(k,j,i) = 1.0_wp / f1_mg_b(k,l) * ( & rho_air_mg(k,l) * ddx2_mg(l) * & ( p_mg(k,j,i+1) + p_mg(k,j,i-1) ) & + rho_air_mg(k,l) * ddy2_mg(l) * & ( p_mg(k,j+1,i) + p_mg(k,j-1,i) ) & + f2_mg_b(k,l) * p_mg(kp1,j,i) & + f3_mg_b(k,l) * p_mg(km1,j,i) & - f_mg(k,j,i) ) ENDDO ENDDO ENDDO !$OMP DO DO i = nxl_mg(l)+1, nxr_mg(l), 2 DO j = nys_mg(l) + 2 - color, nyn_mg(l), 2 !DIR$ IVDEP DO k = nzb+1, ind_even_odd km1 = k+ind_even_odd kp1 = k+ind_even_odd+1 p_mg(k,j,i) = 1.0_wp / f1_mg_b(k,l) * ( & rho_air_mg(k,l) * ddx2_mg(l) * & ( p_mg(k,j,i+1) + p_mg(k,j,i-1) ) & + rho_air_mg(k,l) * ddy2_mg(l) * & ( p_mg(k,j+1,i) + p_mg(k,j-1,i) ) & + f2_mg_b(k,l) * p_mg(kp1,j,i) & + f3_mg_b(k,l) * p_mg(km1,j,i) & - f_mg(k,j,i) ) ENDDO ENDDO ENDDO !$OMP END PARALLEL CALL cpu_log( log_point_s(36), 'redblack_no_unroll_f', 'stop' ) ELSE ! !-- Loop unrolling along y, only one i loop for better cache use CALL cpu_log( log_point_s(38), 'redblack_unroll_f', 'start' ) !$OMP PARALLEL PRIVATE (i,j,k,ic,jc,km1,kp1,jj) !$OMP DO DO ic = nxl_mg(l), nxr_mg(l), 2 DO jc = nys_mg(l), nyn_mg(l), 4 i = ic jj = jc+2-color !DIR$ IVDEP DO k = ind_even_odd+1, nzt_mg(l) km1 = k-ind_even_odd-1 kp1 = k-ind_even_odd j = jj p_mg(k,j,i) = 1.0_wp / f1_mg_b(k,l) * ( & rho_air_mg(k,l) * ddx2_mg(l) * & ( p_mg(k,j,i+1) + p_mg(k,j,i-1) ) & + rho_air_mg(k,l) * ddy2_mg(l) * & ( p_mg(k,j+1,i) + p_mg(k,j-1,i) ) & + f2_mg_b(k,l) * p_mg(kp1,j,i) & + f3_mg_b(k,l) * p_mg(km1,j,i) & - f_mg(k,j,i) ) j = jj+2 p_mg(k,j,i) = 1.0_wp / f1_mg_b(k,l) * ( & rho_air_mg(k,l) * ddx2_mg(l) * & ( p_mg(k,j,i+1) + p_mg(k,j,i-1) ) & + rho_air_mg(k,l) * ddy2_mg(l) * & ( p_mg(k,j+1,i) + p_mg(k,j-1,i) ) & + f2_mg_b(k,l) * p_mg(kp1,j,i) & + f3_mg_b(k,l) * p_mg(km1,j,i) & - f_mg(k,j,i) ) ENDDO i = ic+1 jj = jc+color-1 !DIR$ IVDEP DO k = ind_even_odd+1, nzt_mg(l) km1 = k-ind_even_odd-1 kp1 = k-ind_even_odd j = jj p_mg(k,j,i) = 1.0_wp / f1_mg_b(k,l) * ( & rho_air_mg(k,l) * ddx2_mg(l) * & ( p_mg(k,j,i+1) + p_mg(k,j,i-1) ) & + rho_air_mg(k,l) * ddy2_mg(l) * & ( p_mg(k,j+1,i) + p_mg(k,j-1,i) ) & + f2_mg_b(k,l) * p_mg(kp1,j,i) & + f3_mg_b(k,l) * p_mg(km1,j,i) & - f_mg(k,j,i) ) j = jj+2 p_mg(k,j,i) = 1.0_wp / f1_mg_b(k,l) * ( & rho_air_mg(k,l) * ddx2_mg(l) * & ( p_mg(k,j,i+1) + p_mg(k,j,i-1) ) & + rho_air_mg(k,l) * ddy2_mg(l) * & ( p_mg(k,j+1,i) + p_mg(k,j-1,i) ) & + f2_mg_b(k,l) * p_mg(kp1,j,i) & + f3_mg_b(k,l) * p_mg(km1,j,i) & - f_mg(k,j,i) ) ENDDO i = ic jj = jc+color-1 !DIR$ IVDEP DO k = nzb+1, ind_even_odd km1 = k+ind_even_odd kp1 = k+ind_even_odd+1 j = jj p_mg(k,j,i) = 1.0_wp / f1_mg_b(k,l) * ( & rho_air_mg(k,l) * ddx2_mg(l) * & ( p_mg(k,j,i+1) + p_mg(k,j,i-1) ) & + rho_air_mg(k,l) * ddy2_mg(l) * & ( p_mg(k,j+1,i) + p_mg(k,j-1,i) ) & + f2_mg_b(k,l) * p_mg(kp1,j,i) & + f3_mg_b(k,l) * p_mg(km1,j,i) & - f_mg(k,j,i) ) j = jj+2 p_mg(k,j,i) = 1.0_wp / f1_mg_b(k,l) * ( & rho_air_mg(k,l) * ddx2_mg(l) * & ( p_mg(k,j,i+1) + p_mg(k,j,i-1) ) & + rho_air_mg(k,l) * ddy2_mg(l) * & ( p_mg(k,j+1,i) + p_mg(k,j-1,i) ) & + f2_mg_b(k,l) * p_mg(kp1,j,i) & + f3_mg_b(k,l) * p_mg(km1,j,i) & - f_mg(k,j,i) ) ENDDO i = ic+1 jj = jc+2-color !DIR$ IVDEP DO k = nzb+1, ind_even_odd km1 = k+ind_even_odd kp1 = k+ind_even_odd+1 j = jj p_mg(k,j,i) = 1.0_wp / f1_mg_b(k,l) * ( & rho_air_mg(k,l) * ddx2_mg(l) * & ( p_mg(k,j,i+1) + p_mg(k,j,i-1) ) & + rho_air_mg(k,l) * ddy2_mg(l) * & ( p_mg(k,j+1,i) + p_mg(k,j-1,i) ) & + f2_mg_b(k,l) * p_mg(kp1,j,i) & + f3_mg_b(k,l) * p_mg(km1,j,i) & - f_mg(k,j,i) ) j = jj+2 p_mg(k,j,i) = 1.0_wp / f1_mg_b(k,l) * ( & rho_air_mg(k,l) * ddx2_mg(l) * & ( p_mg(k,j,i+1) + p_mg(k,j,i-1) ) & + rho_air_mg(k,l) * ddy2_mg(l) * & ( p_mg(k,j+1,i) + p_mg(k,j-1,i) ) & + f2_mg_b(k,l) * p_mg(kp1,j,i) & + f3_mg_b(k,l) * p_mg(km1,j,i) & - f_mg(k,j,i) ) ENDDO ENDDO ENDDO !$OMP END PARALLEL CALL cpu_log( log_point_s(38), 'redblack_unroll_f', 'stop' ) ENDIF ! !-- Horizontal boundary conditions CALL special_exchange_horiz( p_mg, color ) IF ( .NOT. bc_lr_cyc ) THEN IF ( bc_dirichlet_l .OR. bc_radiation_l ) THEN p_mg(:,:,nxl_mg(l)-1) = p_mg(:,:,nxl_mg(l)) ENDIF IF ( bc_dirichlet_r .OR. bc_radiation_r ) THEN p_mg(:,:,nxr_mg(l)+1) = p_mg(:,:,nxr_mg(l)) ENDIF ENDIF IF ( .NOT. bc_ns_cyc ) THEN IF ( bc_dirichlet_n .OR. bc_radiation_n ) THEN p_mg(:,nyn_mg(l)+1,:) = p_mg(:,nyn_mg(l),:) ENDIF IF ( bc_dirichlet_s .OR. bc_radiation_s ) THEN p_mg(:,nys_mg(l)-1,:) = p_mg(:,nys_mg(l),:) ENDIF ENDIF ! !-- Bottom and top boundary conditions IF ( ibc_p_b == 1 ) THEN ! !-- Equivalent to p_mg(nzb,:,: ) = p_mg(nzb+1,:,:) p_mg(nzb,:,: ) = p_mg(ind_even_odd+1,:,:) ELSE p_mg(nzb,:,: ) = 0.0_wp ENDIF IF ( ibc_p_t == 1 ) THEN ! !-- Equivalent to p_mg(nzt_mg(l)+1,:,: ) = p_mg(nzt_mg(l),:,:) p_mg(nzt_mg(l)+1,:,: ) = p_mg(ind_even_odd,:,:) ELSE p_mg(nzt_mg(l)+1,:,: ) = 0.0_wp ENDIF ENDDO ENDDO END SUBROUTINE redblack !--------------------------------------------------------------------------------------------------! ! Description: ! ------------ !> Sort k-dimension from sequential into blocks of even and odd. This is required to vectorize the !> red-black subroutine. Version for 3D-REAL arrays !--------------------------------------------------------------------------------------------------! SUBROUTINE sort_k_to_even_odd_blocks( p_mg , glevel ) USE indices, & ONLY: nxl_mg, & nxr_mg, & nys_mg, & nyn_mg, & nzb, & nzt_mg IMPLICIT NONE INTEGER(iwp), INTENT(IN) :: glevel !< grid level REAL(wp), DIMENSION(nzb:nzt_mg(glevel)+1,nys_mg(glevel)-1:nyn_mg(glevel)+1, & nxl_mg(glevel)-1:nxr_mg(glevel)+1) :: p_mg !< array to be sorted ! !-- Local variables INTEGER(iwp) :: i !< index variable along x INTEGER(iwp) :: ind !< index variable along z INTEGER(iwp) :: j !< index variable along y INTEGER(iwp) :: k !< index variable along z INTEGER(iwp) :: l !< grid level REAL(wp), DIMENSION(nzb:nzt_mg(glevel)+1) :: tmp !< odd-even sorted temporary array CALL cpu_log( log_point_s(52), 'sort_k_to_even_odd', 'start' ) l = glevel ind_even_odd = even_odd_level(l) !$OMP PARALLEL PRIVATE (i,j,k,ind,tmp) !$OMP DO DO i = nxl_mg(l)-1, nxr_mg(l)+1 DO j = nys_mg(l)-1, nyn_mg(l)+1 ! !-- Sort the data with even k index ind = nzb-1 DO k = nzb, nzt_mg(l), 2 ind = ind + 1 tmp(ind) = p_mg(k,j,i) ENDDO ! !-- Sort the data with odd k index DO k = nzb+1, nzt_mg(l)+1, 2 ind = ind + 1 tmp(ind) = p_mg(k,j,i) ENDDO p_mg(:,j,i) = tmp ENDDO ENDDO !$OMP END PARALLEL CALL cpu_log( log_point_s(52), 'sort_k_to_even_odd', 'stop' ) END SUBROUTINE sort_k_to_even_odd_blocks !--------------------------------------------------------------------------------------------------! ! Description: ! ------------ !> Sort k-dimension from sequential into blocks of even and odd. This is required to vectorize the !> red-black subroutine. Version for 1D-REAL arrays !--------------------------------------------------------------------------------------------------! SUBROUTINE sort_k_to_even_odd_blocks_1d( f_mg, f_mg_b, glevel ) USE indices, & ONLY: nzb, & nzt_mg IMPLICIT NONE INTEGER(iwp), INTENT(IN) :: glevel !< grid level REAL(wp), DIMENSION(nzb+1:nzt_mg(glevel)) :: f_mg !< 1D input array REAL(wp), DIMENSION(nzb:nzt_mg(glevel)+1) :: f_mg_b !< 1D output array ! !-- Local variables INTEGER(iwp) :: ind !< index variable along z INTEGER(iwp) :: k !< index variable along z ind = nzb - 1 ! !-- Sort the data with even k index DO k = nzb, nzt_mg(glevel), 2 ind = ind + 1 IF ( k >= nzb+1 .AND. k <= nzt_mg(glevel) ) THEN f_mg_b(ind) = f_mg(k) ENDIF ENDDO ! !-- Sort the data with odd k index DO k = nzb+1, nzt_mg(glevel)+1, 2 ind = ind + 1 IF( k >= nzb+1 .AND. k <= nzt_mg(glevel) ) THEN f_mg_b(ind) = f_mg(k) ENDIF ENDDO END SUBROUTINE sort_k_to_even_odd_blocks_1d !--------------------------------------------------------------------------------------------------! ! Description: ! ------------ !> Sort k-dimension from sequential into blocks of even and odd. This is required to vectorize the !> red-black subroutine. Version for 2D-INTEGER arrays !--------------------------------------------------------------------------------------------------! ! SUBROUTINE sort_k_to_even_odd_blocks_int( i_mg , glevel ) ! ! ! USE indices, & ! ONLY: nxl_mg, nxr_mg, nys_mg, nyn_mg, nzb, nzt_mg ! ! IMPLICIT NONE ! ! INTEGER(iwp), INTENT(IN) :: glevel !< grid level ! ! INTEGER(iwp), DIMENSION(nzb:nzt_mg(glevel)+1, & ! nys_mg(glevel)-1:nyn_mg(glevel)+1, & ! nxl_mg(glevel)-1:nxr_mg(glevel)+1) :: & ! i_mg !< array to be sorted !! !!-- Local variables ! INTEGER(iwp) :: i !< index variabel along x ! INTEGER(iwp) :: j !< index variable along y ! INTEGER(iwp) :: k !< index variable along z ! INTEGER(iwp) :: l !< grid level ! INTEGER(iwp) :: ind !< index variable along z ! INTEGER(iwp),DIMENSION(nzb:nzt_mg(glevel)+1) :: tmp !< temporary odd-even sorted array ! ! ! CALL cpu_log( log_point_s(52), 'sort_k_to_even_odd', 'start' ) ! ! l = glevel ! ind_even_odd = even_odd_level(l) ! ! DO i = nxl_mg(l)-1, nxr_mg(l)+1 ! DO j = nys_mg(l)-1, nyn_mg(l)+1 ! ! !-- Sort the data with even k index ! ind = nzb-1 ! DO k = nzb, nzt_mg(l), 2 ! ind = ind + 1 ! tmp(ind) = i_mg(k,j,i) ! ENDDO ! !-- Sort the data with odd k index ! DO k = nzb+1, nzt_mg(l)+1, 2 ! ind = ind + 1 ! tmp(ind) = i_mg(k,j,i) ! ENDDO ! ! i_mg(:,j,i) = tmp ! ! ENDDO ! ENDDO ! ! CALL cpu_log( log_point_s(52), 'sort_k_to_even_odd', 'stop' ) ! ! END SUBROUTINE sort_k_to_even_odd_blocks_int !--------------------------------------------------------------------------------------------------! ! Description: ! ------------ !> Sort k-dimension from blocks of even and odd into sequential !--------------------------------------------------------------------------------------------------! SUBROUTINE sort_k_to_sequential( p_mg ) USE control_parameters, & ONLY: grid_level USE indices, & ONLY: nxl_mg, & nxr_mg, & nys_mg, & nyn_mg, & nzb, & nzt_mg IMPLICIT NONE REAL(wp), DIMENSION(nzb:nzt_mg(grid_level)+1,nys_mg(grid_level)-1:nyn_mg(grid_level)+1, & nxl_mg(grid_level)-1:nxr_mg(grid_level)+1) :: p_mg !< array to be sorted ! !-- Local variables INTEGER(iwp) :: i !< index variable along x INTEGER(iwp) :: j !< index variable along y INTEGER(iwp) :: k !< index variable along z INTEGER(iwp) :: l !< grid level INTEGER(iwp) :: ind !< index variable along z REAL(wp),DIMENSION(nzb:nzt_mg(grid_level)+1) :: tmp !< l = grid_level !$OMP PARALLEL PRIVATE (i,j,k,ind,tmp) !$OMP DO DO i = nxl_mg(l)-1, nxr_mg(l)+1 DO j = nys_mg(l)-1, nyn_mg(l)+1 ind = nzb - 1 tmp = p_mg(:,j,i) DO k = nzb, nzt_mg(l), 2 ind = ind + 1 p_mg(k,j,i) = tmp(ind) ENDDO DO k = nzb+1, nzt_mg(l)+1, 2 ind = ind + 1 p_mg(k,j,i) = tmp(ind) ENDDO ENDDO ENDDO !$OMP END PARALLEL END SUBROUTINE sort_k_to_sequential !--------------------------------------------------------------------------------------------------! ! Description: ! ------------ !> Gather subdomain data from all PEs. !--------------------------------------------------------------------------------------------------! #if defined( __parallel ) SUBROUTINE mg_gather( f2, f2_sub ) USE control_parameters, & ONLY: grid_level USE cpulog, & ONLY: cpu_log, & log_point_s USE indices, & ONLY: mg_loc_ind, & nxl_mg, & nxr_mg, & nys_mg, & nyn_mg, & nzb, & nzt_mg IMPLICIT NONE INTEGER(iwp) :: i !< INTEGER(iwp) :: il !< INTEGER(iwp) :: ir !< INTEGER(iwp) :: j !< INTEGER(iwp) :: jn !< INTEGER(iwp) :: js !< INTEGER(iwp) :: k !< INTEGER(iwp) :: nwords !< REAL(wp), DIMENSION(nzb:nzt_mg(grid_level)+1,nys_mg(grid_level)-1:nyn_mg(grid_level)+1, & nxl_mg(grid_level)-1:nxr_mg(grid_level)+1) :: f2 !< REAL(wp), DIMENSION(nzb:nzt_mg(grid_level)+1,nys_mg(grid_level)-1:nyn_mg(grid_level)+1, & nxl_mg(grid_level)-1:nxr_mg(grid_level)+1) :: f2_l !< REAL(wp), DIMENSION(nzb:mg_loc_ind(5,myid)+1,mg_loc_ind(3,myid)-1:mg_loc_ind(4,myid)+1, & mg_loc_ind(1,myid)-1:mg_loc_ind(2,myid)+1) :: f2_sub !< CALL cpu_log( log_point_s(34), 'mg_gather', 'start' ) f2_l = 0.0_wp ! !-- Store the local subdomain array on the total array js = mg_loc_ind(3,myid) IF ( south_border_pe ) js = js - 1 jn = mg_loc_ind(4,myid) IF ( north_border_pe ) jn = jn + 1 il = mg_loc_ind(1,myid) IF ( left_border_pe ) il = il - 1 ir = mg_loc_ind(2,myid) IF ( right_border_pe ) ir = ir + 1 DO i = il, ir DO j = js, jn DO k = nzb, nzt_mg(grid_level)+1 f2_l(k,j,i) = f2_sub(k,j,i) ENDDO ENDDO ENDDO ! !-- Find out the number of array elements of the total array nwords = SIZE( f2 ) ! !-- Gather subdomain data from all PEs IF ( collective_wait ) CALL MPI_BARRIER( comm2d, ierr ) CALL MPI_ALLREDUCE( f2_l(nzb,nys_mg(grid_level)-1,nxl_mg(grid_level)-1), & f2(nzb,nys_mg(grid_level)-1,nxl_mg(grid_level)-1), nwords, MPI_REAL, & MPI_SUM, comm2d, ierr ) CALL cpu_log( log_point_s(34), 'mg_gather', 'stop' ) END SUBROUTINE mg_gather #endif !--------------------------------------------------------------------------------------------------! ! Description: ! ------------ !> @todo It might be possible to improve the speed of this routine by using non-blocking !> communication !--------------------------------------------------------------------------------------------------! #if defined( __parallel ) SUBROUTINE mg_scatter( p2, p2_sub ) USE control_parameters, & ONLY: grid_level USE cpulog, & ONLY: cpu_log, & log_point_s USE indices, & ONLY: mg_loc_ind, & nxl_mg, & nxr_mg, & nys_mg, & nyn_mg, & nzb, & nzt_mg IMPLICIT NONE REAL(wp), DIMENSION(nzb:nzt_mg(grid_level-1)+1,nys_mg(grid_level-1)-1:nyn_mg(grid_level-1)+1, & nxl_mg(grid_level-1)-1:nxr_mg(grid_level-1)+1) :: p2 !< REAL(wp), DIMENSION(nzb:mg_loc_ind(5,myid)+1,mg_loc_ind(3,myid)-1:mg_loc_ind(4,myid)+1, & mg_loc_ind(1,myid)-1:mg_loc_ind(2,myid)+1) :: p2_sub !< CALL cpu_log( log_point_s(35), 'mg_scatter', 'start' ) p2_sub = p2(:,mg_loc_ind(3,myid)-1:mg_loc_ind(4,myid)+1, & mg_loc_ind(1,myid)-1:mg_loc_ind(2,myid)+1) CALL cpu_log( log_point_s(35), 'mg_scatter', 'stop' ) END SUBROUTINE mg_scatter #endif !--------------------------------------------------------------------------------------------------! ! Description: ! ------------ !> This is where the multigrid technique takes place. V- and W- Cycle are implemented and steered by !> the parameter "gamma". Parameter "nue" determines the convergence of the multigrid iterative !> solution. There are nue times RB-GS iterations. It should be set to "1" or "2", considering the !> time effort one would like to invest. Last choice shows a very good converging factor, but leads !> to an increase in computing time. !--------------------------------------------------------------------------------------------------! RECURSIVE SUBROUTINE next_mg_level( f_mg, p_mg, p3, r ) USE control_parameters, & ONLY: bc_lr_dirrad, & bc_lr_raddir, & bc_ns_dirrad, & bc_ns_raddir, & child_domain, & gamma_mg, & grid_level_count, & maximum_grid_level, & mg_switch_to_pe0_level, & mg_switch_to_pe0, & ngsrb USE indices, & ONLY: mg_loc_ind, & nxl, & nxl_mg, & nxr, & nxr_mg, & nys, & nys_mg, & nyn, & nyn_mg, & nzb, & nzt, & nzt_mg IMPLICIT NONE INTEGER(iwp) :: i !< index variable along x INTEGER(iwp) :: j !< index variable along y INTEGER(iwp) :: k !< index variable along z INTEGER(iwp) :: nxl_mg_save !< INTEGER(iwp) :: nxr_mg_save !< INTEGER(iwp) :: nyn_mg_save !< INTEGER(iwp) :: nys_mg_save !< INTEGER(iwp) :: nzt_mg_save !< REAL(wp), DIMENSION(nzb:nzt_mg(grid_level)+1,nys_mg(grid_level)-1:nyn_mg(grid_level)+1, & nxl_mg(grid_level)-1:nxr_mg(grid_level)+1) :: f_mg !< REAL(wp), DIMENSION(nzb:nzt_mg(grid_level)+1,nys_mg(grid_level)-1:nyn_mg(grid_level)+1, & nxl_mg(grid_level)-1:nxr_mg(grid_level)+1) :: p_mg !< REAL(wp), DIMENSION(nzb:nzt_mg(grid_level)+1,nys_mg(grid_level)-1:nyn_mg(grid_level)+1, & nxl_mg(grid_level)-1:nxr_mg(grid_level)+1) :: p3 !< REAL(wp), DIMENSION(nzb:nzt_mg(grid_level)+1,nys_mg(grid_level)-1:nyn_mg(grid_level)+1, & nxl_mg(grid_level)-1:nxr_mg(grid_level)+1) :: r !< REAL(wp), DIMENSION(nzb:nzt_mg(grid_level-1)+1,nys_mg(grid_level-1)-1:nyn_mg(grid_level-1)+1, & nxl_mg(grid_level-1)-1:nxr_mg(grid_level-1)+1) :: f2 !< REAL(wp), DIMENSION(nzb:nzt_mg(grid_level-1)+1,nys_mg(grid_level-1)-1:nyn_mg(grid_level-1)+1, & nxl_mg(grid_level-1)-1:nxr_mg(grid_level-1)+1) :: p2 !< REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: f2_sub !< #if defined( __parallel ) REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: p2_sub !< #endif ! !-- Restriction to the coarsest grid 10 IF ( grid_level == 1 ) THEN ! !-- Solution on the coarsest grid. Double the number of Gauss-Seidel iterations in order to get a !-- more accurate solution. ngsrb = 2 * ngsrb ind_even_odd = even_odd_level(grid_level) CALL redblack( f_mg, p_mg ) ngsrb = ngsrb / 2 ELSEIF ( grid_level /= 1 ) THEN grid_level_count(grid_level) = grid_level_count(grid_level) + 1 ! !-- Solution on the actual grid level ind_even_odd = even_odd_level(grid_level) CALL redblack( f_mg, p_mg ) ! !-- Determination of the actual residual CALL resid( f_mg, p_mg, r ) !-- Restriction of the residual (finer grid values!) to the next coarser grid. Therefore, the !-- grid level has to be decremented now. nxl..nzt have to be set to the coarse grid values, !-- because these variables are needed for the exchange of ghost points in routine exchange_horiz grid_level = grid_level - 1 nxl = nxl_mg(grid_level) nys = nys_mg(grid_level) nxr = nxr_mg(grid_level) nyn = nyn_mg(grid_level) nzt = nzt_mg(grid_level) IF ( grid_level == mg_switch_to_pe0_level ) THEN ! !-- From this level on, calculations are done on PE0 only. First, carry out restriction on the !-- subdomain. Therefore, indices of the level have to be changed to subdomain values in !-- between (otherwise, the restrict routine would expect the gathered array). nxl_mg_save = nxl_mg(grid_level) nxr_mg_save = nxr_mg(grid_level) nys_mg_save = nys_mg(grid_level) nyn_mg_save = nyn_mg(grid_level) nzt_mg_save = nzt_mg(grid_level) nxl_mg(grid_level) = mg_loc_ind(1,myid) nxr_mg(grid_level) = mg_loc_ind(2,myid) nys_mg(grid_level) = mg_loc_ind(3,myid) nyn_mg(grid_level) = mg_loc_ind(4,myid) nzt_mg(grid_level) = mg_loc_ind(5,myid) nxl = mg_loc_ind(1,myid) nxr = mg_loc_ind(2,myid) nys = mg_loc_ind(3,myid) nyn = mg_loc_ind(4,myid) nzt = mg_loc_ind(5,myid) ALLOCATE( f2_sub(nzb:nzt_mg(grid_level)+1,nys_mg(grid_level)-1:nyn_mg(grid_level)+1, & nxl_mg(grid_level)-1:nxr_mg(grid_level)+1) ) CALL restrict( f2_sub, r ) ! !-- Restore the correct indices of this level nxl_mg(grid_level) = nxl_mg_save nxr_mg(grid_level) = nxr_mg_save nys_mg(grid_level) = nys_mg_save nyn_mg(grid_level) = nyn_mg_save nzt_mg(grid_level) = nzt_mg_save nxl = nxl_mg(grid_level) nxr = nxr_mg(grid_level) nys = nys_mg(grid_level) nyn = nyn_mg(grid_level) nzt = nzt_mg(grid_level) ! !-- Gather all arrays from the subdomains on PE0 #if defined( __parallel ) CALL mg_gather( f2, f2_sub ) #endif ! !-- Set switch for routine exchange_horiz, that no ghostpoint exchange has to be carried out !-- from now on mg_switch_to_pe0 = .TRUE. ! !-- In case of non-cyclic lateral boundary conditions, both in- and outflow conditions have to !-- be used on all PEs after the switch, because then they have the total domain. IF ( bc_lr_dirrad ) THEN bc_dirichlet_l = .TRUE. bc_dirichlet_r = .FALSE. bc_radiation_l = .FALSE. bc_radiation_r = .TRUE. ELSEIF ( bc_lr_raddir ) THEN bc_dirichlet_l = .FALSE. bc_dirichlet_r = .TRUE. bc_radiation_l = .TRUE. bc_radiation_r = .FALSE. ELSEIF ( child_domain .OR. nesting_offline ) THEN bc_dirichlet_l = .TRUE. bc_dirichlet_r = .TRUE. ENDIF IF ( bc_ns_dirrad ) THEN bc_dirichlet_n = .TRUE. bc_dirichlet_s = .FALSE. bc_radiation_n = .FALSE. bc_radiation_s = .TRUE. ELSEIF ( bc_ns_raddir ) THEN bc_dirichlet_n = .FALSE. bc_dirichlet_s = .TRUE. bc_radiation_n = .TRUE. bc_radiation_s = .FALSE. ELSEIF ( child_domain .OR. nesting_offline) THEN bc_dirichlet_s = .TRUE. bc_dirichlet_n = .TRUE. ENDIF DEALLOCATE( f2_sub ) ELSE CALL restrict( f2, r ) ind_even_odd = even_odd_level(grid_level) ! Must be after restrict ENDIF p2 = 0.0_wp ! !-- Repeat the same procedure untill the coarsest grid is reached CALL next_mg_level( f2, p2, p3, r ) ENDIF ! !-- Now follows the prolongation IF ( grid_level >= 2 ) THEN ! !-- Prolongation of the new residual. The values are transferred from the coarse to the next !-- finer grid. IF ( grid_level == mg_switch_to_pe0_level+1 ) THEN #if defined( __parallel ) ! !-- At this level, the new residual first has to be scattered from PE0 to the other PEs ALLOCATE( p2_sub(nzb:mg_loc_ind(5,myid)+1,mg_loc_ind(3,myid)-1:mg_loc_ind(4,myid)+1, & mg_loc_ind(1,myid)-1:mg_loc_ind(2,myid)+1) ) CALL mg_scatter( p2, p2_sub ) ! !-- Therefore, indices of the previous level have to be changed to subdomain values in between !-- (otherwise, the prolong routine would expect the gathered array). nxl_mg_save = nxl_mg(grid_level-1) nxr_mg_save = nxr_mg(grid_level-1) nys_mg_save = nys_mg(grid_level-1) nyn_mg_save = nyn_mg(grid_level-1) nzt_mg_save = nzt_mg(grid_level-1) nxl_mg(grid_level-1) = mg_loc_ind(1,myid) nxr_mg(grid_level-1) = mg_loc_ind(2,myid) nys_mg(grid_level-1) = mg_loc_ind(3,myid) nyn_mg(grid_level-1) = mg_loc_ind(4,myid) nzt_mg(grid_level-1) = mg_loc_ind(5,myid) ! !-- Set switch for routine exchange_horiz, that ghost point exchange has to be carried out !-- again from now on mg_switch_to_pe0 = .FALSE. ! !-- For non-cyclic lateral boundary conditions and in case of nesting, restore the in-/outflow !-- conditions. bc_dirichlet_l = .FALSE.; bc_dirichlet_r = .FALSE. bc_dirichlet_n = .FALSE.; bc_dirichlet_s = .FALSE. bc_radiation_l = .FALSE.; bc_radiation_r = .FALSE. bc_radiation_n = .FALSE.; bc_radiation_s = .FALSE. IF ( pleft == MPI_PROC_NULL ) THEN IF ( bc_lr_dirrad .OR. child_domain .OR. nesting_offline ) THEN bc_dirichlet_l = .TRUE. ELSEIF ( bc_lr_raddir ) THEN bc_radiation_l = .TRUE. ENDIF ENDIF IF ( pright == MPI_PROC_NULL ) THEN IF ( bc_lr_dirrad ) THEN bc_radiation_r = .TRUE. ELSEIF ( bc_lr_raddir .OR. child_domain .OR. nesting_offline ) THEN bc_dirichlet_r = .TRUE. ENDIF ENDIF IF ( psouth == MPI_PROC_NULL ) THEN IF ( bc_ns_dirrad ) THEN bc_radiation_s = .TRUE. ELSEIF ( bc_ns_raddir .OR. child_domain .OR. nesting_offline ) THEN bc_dirichlet_s = .TRUE. ENDIF ENDIF IF ( pnorth == MPI_PROC_NULL ) THEN IF ( bc_ns_dirrad .OR. child_domain .OR. nesting_offline ) THEN bc_dirichlet_n = .TRUE. ELSEIF ( bc_ns_raddir ) THEN bc_radiation_n = .TRUE. ENDIF ENDIF CALL prolong( p2_sub, p3 ) ! !-- Restore the correct indices of the previous level nxl_mg(grid_level-1) = nxl_mg_save nxr_mg(grid_level-1) = nxr_mg_save nys_mg(grid_level-1) = nys_mg_save nyn_mg(grid_level-1) = nyn_mg_save nzt_mg(grid_level-1) = nzt_mg_save DEALLOCATE( p2_sub ) #endif ELSE CALL prolong( p2, p3 ) ENDIF ! !-- Computation of the new pressure correction. Therefore, values from prior grids are added up !-- automatically stage by stage. DO i = nxl_mg(grid_level)-1, nxr_mg(grid_level)+1 DO j = nys_mg(grid_level)-1, nyn_mg(grid_level)+1 DO k = nzb, nzt_mg(grid_level)+1 p_mg(k,j,i) = p_mg(k,j,i) + p3(k,j,i) ENDDO ENDDO ENDDO ! !-- Relaxation of the new solution CALL redblack( f_mg, p_mg ) ENDIF ! !-- The following few lines serve the steering of the multigrid scheme IF ( grid_level == maximum_grid_level ) THEN GOTO 20 ELSEIF ( grid_level /= maximum_grid_level .AND. grid_level /= 1 .AND. & grid_level_count(grid_level) /= gamma_mg ) THEN GOTO 10 ENDIF ! !-- Reset counter for the next call of poismg grid_level_count(grid_level) = 0 ! !-- Continue with the next finer level. nxl..nzt have to be set to the finer grid values, because !-- these variables are needed for the exchange of ghost points in routine exchange_horiz. grid_level = grid_level + 1 ind_even_odd = even_odd_level(grid_level) nxl = nxl_mg(grid_level) nxr = nxr_mg(grid_level) nys = nys_mg(grid_level) nyn = nyn_mg(grid_level) nzt = nzt_mg(grid_level) 20 CONTINUE END SUBROUTINE next_mg_level !--------------------------------------------------------------------------------------------------! ! Description: ! ------------ !> Initial settings for sorting k-dimension from sequential order (alternate even/odd) into blocks !> of even and odd or vice versa !--------------------------------------------------------------------------------------------------! SUBROUTINE init_even_odd_blocks USE arrays_3d, & ONLY: f1_mg, & f2_mg, & f3_mg USE control_parameters, & ONLY: grid_level, & maximum_grid_level USE indices, & ONLY: nzb, & nzt, & nzt_mg USE indices, & ONLY: nzb, & nzt_mg IMPLICIT NONE ! !-- Local variables INTEGER(iwp) :: i !< INTEGER(iwp) :: l !< LOGICAL, SAVE :: lfirst = .TRUE. !< IF ( .NOT. lfirst ) RETURN ALLOCATE( even_odd_level(maximum_grid_level) ) ALLOCATE( f1_mg_b(nzb:nzt+1,maximum_grid_level), f2_mg_b(nzb:nzt+1,maximum_grid_level), & f3_mg_b(nzb:nzt+1,maximum_grid_level) ) ! !-- Set border index between the even and odd block DO i = maximum_grid_level, 1, -1 even_odd_level(i) = nzt_mg(i) / 2 ENDDO ! !-- Sort grid coefficients used in red/black scheme and for calculating the residual to block !-- (even/odd) structure DO l = maximum_grid_level, 1 , -1 CALL sort_k_to_even_odd_blocks( f1_mg(nzb+1:nzt_mg(grid_level),l), & f1_mg_b(nzb:nzt_mg(grid_level)+1,l), l ) CALL sort_k_to_even_odd_blocks( f2_mg(nzb+1:nzt_mg(grid_level),l), & f2_mg_b(nzb:nzt_mg(grid_level)+1,l), l ) CALL sort_k_to_even_odd_blocks( f3_mg(nzb+1:nzt_mg(grid_level),l), & f3_mg_b(nzb:nzt_mg(grid_level)+1,l), l ) ENDDO lfirst = .FALSE. END SUBROUTINE init_even_odd_blocks !--------------------------------------------------------------------------------------------------! ! Description: ! ------------ !> Special exchange_horiz subroutine for use in redblack. Transfers only "red" or "black" data !> points. !--------------------------------------------------------------------------------------------------! SUBROUTINE special_exchange_horiz( p_mg, color ) USE control_parameters, & ONLY: grid_level #if defined( __parallel ) USE control_parameters, & ONLY: mg_switch_to_pe0_level, & synchronous_exchange #endif USE indices, & ONLY: nxl_mg, & nxr_mg, & nys_mg, & nyn_mg, & nzb, & nzt_mg #if defined( __parallel ) USE indices, & ONLY: nxl, & nxr, & nys, & nyn, & nzt #endif IMPLICIT NONE INTEGER(iwp), INTENT(IN) :: color !< flag for grid point type (red or black) REAL(wp), DIMENSION(nzb:nzt_mg(grid_level)+1,nys_mg(grid_level)-1:nyn_mg(grid_level)+1, & nxl_mg(grid_level)-1:nxr_mg(grid_level)+1) :: p_mg !< treated array #if defined ( __parallel ) ! !-- Local variables INTEGER(iwp) :: i !< index variable along x INTEGER(iwp) :: i1 !< index variable along x on coarse level INTEGER(iwp) :: i2 !< index variable along x on coarse level INTEGER(iwp) :: j !< index variable along y INTEGER(iwp) :: j1 !< index variable along y on coarse level INTEGER(iwp) :: j2 !< index variable along y on coarse level INTEGER(iwp) :: k !< index variable along z INTEGER(iwp) :: l !< short for grid level INTEGER(iwp) :: jys !< index for lower local PE boundary along y INTEGER(iwp) :: jyn !< index for upper local PE boundary along y INTEGER(iwp) :: ixl !< index for lower local PE boundary along x INTEGER(iwp) :: ixr !< index for upper local PE boundary along x LOGICAL :: synchronous_exchange_save !< dummy to reset synchronous_exchange to prescribed value REAL(wp), DIMENSION(:,:,:), ALLOCATABLE :: temp !< temporary array on next coarser grid level synchronous_exchange_save = synchronous_exchange synchronous_exchange = .FALSE. l = grid_level ind_even_odd = even_odd_level(grid_level) ! !-- Restricted transfer only on finer levels with enough data. Restricted transfer is not possible !-- for levels smaller or equal to 'switch to PE0 levels', since array bounds do not fit. !-- Moreover, it is not possible for the coarsest grid level, since the dimensions of temp are not !-- defined. For such cases, normal exchange_horiz is called. IF ( l > 1 .AND. l > mg_switch_to_pe0_level + 1 .AND. & ( ngp_xz(grid_level) >= 900 .OR. ngp_yz(grid_level) >= 900 ) ) THEN jys = nys_mg(grid_level-1) jyn = nyn_mg(grid_level-1) ixl = nxl_mg(grid_level-1) ixr = nxr_mg(grid_level-1) ALLOCATE( temp(nzb:nzt_mg(l-1)+1,jys-1:jyn+1,ixl-1:ixr+1) ) ! !-- Handling the even k Values !-- Collecting data for the north - south exchange !-- Since only every second value has to be transfered, data are stored on the next coarser grid !-- level, because the arrays on that level have just the required size i1 = nxl_mg(grid_level-1) i2 = nxl_mg(grid_level-1) DO i = nxl_mg(l), nxr_mg(l), 2 DO j = nys_mg(l) + 2 - color, nyn_mg(l), 2 IF ( j == nys_mg(l) ) THEN !DIR$ IVDEP DO k = ind_even_odd+1, nzt_mg(l) temp(k-ind_even_odd,jys,i1) = p_mg(k,j,i) ENDDO i1 = i1 + 1 ENDIF IF ( j == nyn_mg(l) ) THEN !DIR$ IVDEP DO k = ind_even_odd+1, nzt_mg(l) temp(k-ind_even_odd,jyn,i2) = p_mg(k,j,i) ENDDO i2 = i2 + 1 ENDIF ENDDO ENDDO DO i = nxl_mg(l)+1, nxr_mg(l), 2 DO j = nys_mg(l) + (color-1), nyn_mg(l), 2 IF ( j == nys_mg(l) ) THEN !DIR$ IVDEP DO k = ind_even_odd+1, nzt_mg(l) temp(k-ind_even_odd,jys,i1) = p_mg(k,j,i) ENDDO i1 = i1 + 1 ENDIF IF ( j == nyn_mg(l) ) THEN !DIR$ IVDEP DO k = ind_even_odd+1, nzt_mg(l) temp(k-ind_even_odd,jyn,i2) = p_mg(k,j,i) ENDDO i2 = i2 + 1 ENDIF ENDDO ENDDO grid_level = grid_level-1 nxl = nxl_mg(grid_level) nys = nys_mg(grid_level) nxr = nxr_mg(grid_level) nyn = nyn_mg(grid_level) nzt = nzt_mg(grid_level) send_receive = 'ns' CALL exchange_horiz( temp, 1 ) grid_level = grid_level+1 i1 = nxl_mg(grid_level-1) i2 = nxl_mg(grid_level-1) DO i = nxl_mg(l), nxr_mg(l), 2 DO j = nys_mg(l) + 2 - color, nyn_mg(l), 2 IF ( j == nys_mg(l) ) THEN !DIR$ IVDEP DO k = ind_even_odd+1, nzt_mg(l) p_mg(k,nyn_mg(l)+1,i) = temp(k-ind_even_odd,jyn+1,i1) ENDDO i1 = i1 + 1 ENDIF IF ( j == nyn_mg(l) ) THEN !DIR$ IVDEP DO k = ind_even_odd+1, nzt_mg(l) p_mg(k,nys_mg(l)-1,i) = temp(k-ind_even_odd,jys-1,i2) ENDDO i2 = i2 + 1 ENDIF ENDDO ENDDO DO i = nxl_mg(l)+1, nxr_mg(l), 2 DO j = nys_mg(l) + (color-1), nyn_mg(l), 2 IF ( j == nys_mg(l) ) THEN !DIR$ IVDEP DO k = ind_even_odd+1, nzt_mg(l) p_mg(k,nyn_mg(l)+1,i) = temp(k-ind_even_odd,jyn+1,i1) ENDDO i1 = i1 + 1 ENDIF IF ( j == nyn_mg(l) ) THEN !DIR$ IVDEP DO k = ind_even_odd+1, nzt_mg(l) p_mg(k,nys_mg(l)-1,i) = temp(k-ind_even_odd,jys-1,i2) ENDDO i2 = i2 + 1 ENDIF ENDDO ENDDO ! !-- Collecting data for the left - right exchange. !-- Since only every second value has to be transfered, data are stored on the next coarser grid !-- level, because the arrays on that level have just the required size. j1 = nys_mg(grid_level-1) j2 = nys_mg(grid_level-1) DO j = nys_mg(l) + 2 - color, nyn_mg(l), 2 DO i = nxl_mg(l), nxr_mg(l), 2 IF ( i == nxl_mg(l) ) THEN !DIR$ IVDEP DO k = ind_even_odd+1, nzt_mg(l) temp(k-ind_even_odd,j1,ixl) = p_mg(k,j,i) ENDDO j1 = j1 + 1 ENDIF IF ( i == nxr_mg(l) ) THEN !DIR$ IVDEP DO k = ind_even_odd+1, nzt_mg(l) temp(k-ind_even_odd,j2,ixr) = p_mg(k,j,i) ENDDO j2 = j2 + 1 ENDIF ENDDO ENDDO DO j = nys_mg(l) + (color-1), nyn_mg(l), 2 DO i = nxl_mg(l)+1, nxr_mg(l), 2 IF ( i == nxl_mg(l) ) THEN !DIR$ IVDEP DO k = ind_even_odd+1, nzt_mg(l) temp(k-ind_even_odd,j1,ixl) = p_mg(k,j,i) ENDDO j1 = j1 + 1 ENDIF IF ( i == nxr_mg(l) ) THEN !DIR$ IVDEP DO k = ind_even_odd+1, nzt_mg(l) temp(k-ind_even_odd,j2,ixr) = p_mg(k,j,i) ENDDO j2 = j2 + 1 ENDIF ENDDO ENDDO grid_level = grid_level-1 send_receive = 'lr' CALL exchange_horiz( temp, 1 ) grid_level = grid_level+1 j1 = nys_mg(grid_level-1) j2 = nys_mg(grid_level-1) DO j = nys_mg(l) + 2 - color, nyn_mg(l), 2 DO i = nxl_mg(l), nxr_mg(l), 2 IF ( i == nxl_mg(l) ) THEN !DIR$ IVDEP DO k = ind_even_odd+1, nzt_mg(l) p_mg(k,j,nxr_mg(l)+1) = temp(k-ind_even_odd,j1,ixr+1) ENDDO j1 = j1 + 1 ENDIF IF ( i == nxr_mg(l) ) THEN !DIR$ IVDEP DO k = ind_even_odd+1, nzt_mg(l) p_mg(k,j,nxl_mg(l)-1) = temp(k-ind_even_odd,j2,ixl-1) ENDDO j2 = j2 + 1 ENDIF ENDDO ENDDO DO j = nys_mg(l) + (color-1), nyn_mg(l), 2 DO i = nxl_mg(l)+1, nxr_mg(l), 2 IF ( i == nxl_mg(l) ) THEN !DIR$ IVDEP DO k = ind_even_odd+1, nzt_mg(l) p_mg(k,j,nxr_mg(l)+1) = temp(k-ind_even_odd,j1,ixr+1) ENDDO j1 = j1 + 1 ENDIF IF ( i == nxr_mg(l) ) THEN !DIR$ IVDEP DO k = ind_even_odd+1, nzt_mg(l) p_mg(k,j,nxl_mg(l)-1) = temp(k-ind_even_odd,j2,ixl-1) ENDDO j2 = j2 + 1 ENDIF ENDDO ENDDO ! !-- Now handling the even k values !-- Collecting data for the north - south exchange. !-- Since only every second value has to be transfered, data are stored on the next coarser grid !-- level, because the arrays on that level have just the required size. i1 = nxl_mg(grid_level-1) i2 = nxl_mg(grid_level-1) DO i = nxl_mg(l), nxr_mg(l), 2 DO j = nys_mg(l) + (color-1), nyn_mg(l), 2 IF ( j == nys_mg(l) ) THEN !DIR$ IVDEP DO k = nzb+1, ind_even_odd temp(k,jys,i1) = p_mg(k,j,i) ENDDO i1 = i1 + 1 ENDIF IF ( j == nyn_mg(l) ) THEN !DIR$ IVDEP DO k = nzb+1, ind_even_odd temp(k,jyn,i2) = p_mg(k,j,i) ENDDO i2 = i2 + 1 ENDIF ENDDO ENDDO DO i = nxl_mg(l)+1, nxr_mg(l), 2 DO j = nys_mg(l) + 2 - color, nyn_mg(l), 2 IF ( j == nys_mg(l) ) THEN !DIR$ IVDEP DO k = nzb+1, ind_even_odd temp(k,jys,i1) = p_mg(k,j,i) ENDDO i1 = i1 + 1 ENDIF IF ( j == nyn_mg(l) ) THEN !DIR$ IVDEP DO k = nzb+1, ind_even_odd temp(k,jyn,i2) = p_mg(k,j,i) ENDDO i2 = i2 + 1 ENDIF ENDDO ENDDO grid_level = grid_level-1 send_receive = 'ns' CALL exchange_horiz( temp, 1 ) grid_level = grid_level+1 i1 = nxl_mg(grid_level-1) i2 = nxl_mg(grid_level-1) DO i = nxl_mg(l), nxr_mg(l), 2 DO j = nys_mg(l) + (color-1), nyn_mg(l), 2 IF ( j == nys_mg(l) ) THEN !DIR$ IVDEP DO k = nzb+1, ind_even_odd p_mg(k,nyn_mg(l)+1,i) = temp(k,jyn+1,i1) ENDDO i1 = i1 + 1 ENDIF IF ( j == nyn_mg(l) ) THEN !DIR$ IVDEP DO k = nzb+1, ind_even_odd p_mg(k,nys_mg(l)-1,i) = temp(k,jys-1,i2) ENDDO i2 = i2 + 1 ENDIF ENDDO ENDDO DO i = nxl_mg(l)+1, nxr_mg(l), 2 DO j = nys_mg(l) + 2 - color, nyn_mg(l), 2 IF ( j == nys_mg(l) ) THEN !DIR$ IVDEP DO k = nzb+1, ind_even_odd p_mg(k,nyn_mg(l)+1,i) = temp(k,jyn+1,i1) ENDDO i1 = i1 + 1 ENDIF IF ( j == nyn_mg(l) ) THEN !DIR$ IVDEP DO k = nzb+1, ind_even_odd p_mg(k,nys_mg(l)-1,i) = temp(k,jys-1,i2) ENDDO i2 = i2 + 1 ENDIF ENDDO ENDDO j1 = nys_mg(grid_level-1) j2 = nys_mg(grid_level-1) DO i = nxl_mg(l), nxr_mg(l), 2 DO j = nys_mg(l) + (color-1), nyn_mg(l), 2 IF ( i == nxl_mg(l) ) THEN !DIR$ IVDEP DO k = nzb+1, ind_even_odd temp(k,j1,ixl) = p_mg(k,j,i) ENDDO j1 = j1 + 1 ENDIF IF ( i == nxr_mg(l) ) THEN !DIR$ IVDEP DO k = nzb+1, ind_even_odd temp(k,j2,ixr) = p_mg(k,j,i) ENDDO j2 = j2 + 1 ENDIF ENDDO ENDDO DO i = nxl_mg(l)+1, nxr_mg(l), 2 DO j = nys_mg(l) + 2 - color, nyn_mg(l), 2 IF ( i == nxl_mg(l) ) THEN !DIR$ IVDEP DO k = nzb+1, ind_even_odd temp(k,j1,ixl) = p_mg(k,j,i) ENDDO j1 = j1 + 1 ENDIF IF ( i == nxr_mg(l) ) THEN !DIR$ IVDEP DO k = nzb+1, ind_even_odd temp(k,j2,ixr) = p_mg(k,j,i) ENDDO j2 = j2 + 1 ENDIF ENDDO ENDDO grid_level = grid_level-1 send_receive = 'lr' CALL exchange_horiz( temp, 1 ) grid_level = grid_level+1 nxl = nxl_mg(grid_level) nys = nys_mg(grid_level) nxr = nxr_mg(grid_level) nyn = nyn_mg(grid_level) nzt = nzt_mg(grid_level) j1 = nys_mg(grid_level-1) j2 = nys_mg(grid_level-1) DO i = nxl_mg(l), nxr_mg(l), 2 DO j = nys_mg(l) + (color-1), nyn_mg(l), 2 IF ( i == nxl_mg(l) ) THEN !DIR$ IVDEP DO k = nzb+1, ind_even_odd p_mg(k,j,nxr_mg(l)+1) = temp(k,j1,ixr+1) ENDDO j1 = j1 + 1 ENDIF IF ( i == nxr_mg(l) ) THEN !DIR$ IVDEP DO k = nzb+1, ind_even_odd p_mg(k,j,nxl_mg(l)-1) = temp(k,j2,ixl-1) ENDDO j2 = j2 + 1 ENDIF ENDDO ENDDO DO i = nxl_mg(l)+1, nxr_mg(l), 2 DO j = nys_mg(l) + 2 - color, nyn_mg(l), 2 IF ( i == nxl_mg(l) ) THEN !DIR$ IVDEP DO k = nzb+1, ind_even_odd p_mg(k,j,nxr_mg(l)+1) = temp(k,j1,ixr+1) ENDDO j1 = j1 + 1 ENDIF IF ( i == nxr_mg(l) ) THEN !DIR$ IVDEP DO k = nzb+1, ind_even_odd p_mg(k,j,nxl_mg(l)-1) = temp(k,j2,ixl-1) ENDDO j2 = j2 + 1 ENDIF ENDDO ENDDO DEALLOCATE( temp ) ELSE ! !-- Standard horizontal ghost boundary exchange for small coarse grid levels, where the transfer !-- time is latency bound CALL exchange_horiz( p_mg, 1 ) ENDIF ! !-- Reset values to default PALM setup synchronous_exchange = synchronous_exchange_save send_receive = 'al' #else ! !-- Next line is to avoid compiler error due to unused dummy argument IF ( color == 1234567 ) RETURN ! !-- Standard horizontal ghost boundary exchange for small coarse grid levels, where the transfer !-- time is latency bound. CALL exchange_horiz( p_mg, 1 ) #endif END SUBROUTINE special_exchange_horiz END MODULE poismg_mod