MODULE dynnxt1d !!====================================================================== !! *** MODULE dynnxt1d *** !! Ocean dynamics: time stepping in 1D configuration !!====================================================================== #if defined key_c1d !!---------------------------------------------------------------------- !! 'key_c1d' 1D Configuration !!---------------------------------------------------------------------- !!---------------------------------------------------------------------- !! dyn_nxt_1d : update the horizontal velocity from the momentum trend !!---------------------------------------------------------------------- !! * Modules used USE oce ! ocean dynamics and tracers USE dom_oce ! ocean space and time domain USE in_out_manager ! I/O manager USE lbclnk ! lateral boundary condition (or mpp link) USE prtctl ! Print control IMPLICIT NONE PRIVATE !! * Accessibility PUBLIC dyn_nxt_1d ! routine called by step.F90 !!---------------------------------------------------------------------- CONTAINS SUBROUTINE dyn_nxt_1d ( kt ) !!---------------------------------------------------------------------- !! *** ROUTINE dyn_nxt_1d *** !! !! ** Purpose : Compute the after horizontal velocity from the !! momentum trend. !! !! ** Method : Apply lateral boundary conditions on the trends (ua,va) !! through calls to routine lbc_lnk. !! After velocity is compute using a leap-frog scheme environment: !! (ua,va) = (ub,vb) + 2 rdt (ua,va) !! Time filter applied on now horizontal velocity to avoid the !! divergence of two consecutive time-steps and swap of dynamics !! arrays to start the next time step: !! (ub,vb) = (un,vn) + atfp [ (ub,vb) + (ua,va) - 2 (un,vn) ] !! (un,vn) = (ua,va) !! !! ** Action : - Update ub,vb arrays, the before horizontal velocity !! - Update un,vn arrays, the now horizontal velocity !! !! History : !! ! 87-02 (P. Andrich, D. L Hostis) Original code !! ! 90-10 (C. Levy, G. Madec) !! ! 93-03 (M. Guyon) symetrical conditions !! ! 97-02 (G. Madec & M. Imbard) opa, release 8.0 !! ! 97-04 (A. Weaver) Euler forward step !! ! 97-06 (G. Madec) lateral boudary cond., lbc routine !! 8.5 ! 02-08 (G. Madec) F90: Free form and module !! ! 04-10 (C. Ethe) 1D configuration !!---------------------------------------------------------------------- !! * Arguments INTEGER, INTENT( in ) :: kt ! ocean time-step index !! * Local declarations INTEGER :: ji, jj, jk ! dummy loop indices REAL(wp) :: z2dt ! temporary scalar !!---------------------------------------------------------------------- !! OPA 9.0 , LOCEAN-IPSL (2005) !! $Header$ !! This software is governed by the CeCILL licence see modipsl/doc/NEMO_CeCILL.txt !!---------------------------------------------------------------------- IF( kt == nit000 ) THEN IF(lwp) WRITE(numout,*) IF(lwp) WRITE(numout,*) 'dyn_nxt_1d : time stepping on 1D configuation' IF(lwp) WRITE(numout,*) '~~~~~~~' ENDIF ! Local constant initialization z2dt = 2. * rdt IF( neuler == 0 .AND. kt == nit000 ) z2dt = rdt ! Lateral boundary conditions on ( ua, va ) CALL lbc_lnk( ua, 'U', -1. ) CALL lbc_lnk( va, 'V', -1. ) ! ! =============== DO jk = 1, jpkm1 ! Horizontal slab ! ! =============== ! Next velocity ! ------------- DO jj = 1, jpj ! caution: don't use (:,:) for this loop DO ji = 1, jpi ! it causes optimization problems on NEC in auto-tasking ! Leap-frog time stepping ua(ji,jj,jk) = ( ub(ji,jj,jk) + z2dt * ua(ji,jj,jk) ) * umask(ji,jj,jk) va(ji,jj,jk) = ( vb(ji,jj,jk) + z2dt * va(ji,jj,jk) ) * vmask(ji,jj,jk) END DO END DO ! ! =============== END DO ! End of slab ! ! =============== ! ! =============== DO jk = 1, jpkm1 ! Horizontal slab ! ! =============== ! Time filter and swap of dynamics arrays ! ------------------------------------------ IF( neuler == 0 .AND. kt == nit000 ) THEN DO jj = 1, jpj ! caution: don't use (:,:) for this loop DO ji = 1, jpi ! it causes optimization problems on NEC in auto-tasking ! Euler (forward) time stepping ub(ji,jj,jk) = un(ji,jj,jk) vb(ji,jj,jk) = vn(ji,jj,jk) un(ji,jj,jk) = ua(ji,jj,jk) vn(ji,jj,jk) = va(ji,jj,jk) END DO END DO ELSE DO jj = 1, jpj ! caution: don't use (:,:) for this loop DO ji = 1, jpi ! it causes optimization problems on NEC in auto-tasking ! Leap-frog time stepping ub(ji,jj,jk) = atfp * ( ub(ji,jj,jk) + ua(ji,jj,jk) ) + atfp1 * un(ji,jj,jk) vb(ji,jj,jk) = atfp * ( vb(ji,jj,jk) + va(ji,jj,jk) ) + atfp1 * vn(ji,jj,jk) un(ji,jj,jk) = ua(ji,jj,jk) vn(ji,jj,jk) = va(ji,jj,jk) END DO END DO ENDIF ! ! =============== END DO ! End of slab ! ! =============== IF(ln_ctl) THEN CALL prt_ctl(tab3d_1=un, clinfo1=' nxt_1d - Un: ', mask1=umask, & & tab3d_2=vn, clinfo2=' Vn: ', mask2=vmask) ENDIF ! IF(l_ctl) WRITE(numout,*) ' nxt - Un: ', SUM(un(2:nictl,2:njctl,1:jpkm1)*umask(2:nictl,2:njctl,1:jpkm1)), & ! & ' Vn: ', SUM(vn(2:nictl,2:njctl,1:jpkm1)*vmask(2:nictl,2:njctl,1:jpkm1)) END SUBROUTINE dyn_nxt_1d #else !!---------------------------------------------------------------------- !! Default key NO 1D Config !!---------------------------------------------------------------------- CONTAINS SUBROUTINE dyn_nxt_1d ( kt ) WRITE(*,*) 'dyn_nxt_1d: You should not have seen this print! error?', kt END SUBROUTINE dyn_nxt_1d #endif !!====================================================================== END MODULE dynnxt1d