MODULE dynnxt !!====================================================================== !! *** MODULE dynnxt *** !! Ocean dynamics: time stepping !!====================================================================== !!---------------------------------------------------------------------- !! dyn_nxt : 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 obc_oce ! ocean open boundary conditions USE obcdyn ! open boundary condition for momentum (obc_dyn routine) USE obcdyn_bt ! 2D open boundary condition for momentum (obc_dyn_bt routine) USE obcvol ! ocean open boundary condition (obc_vol routines) USE dynspg_oce ! type of surface pressure gradient USE lbclnk ! lateral boundary condition (or mpp link) USE prtctl ! Print control USE agrif_opa_update USE agrif_opa_interp IMPLICIT NONE PRIVATE !! * Accessibility PUBLIC dyn_nxt ! routine called by step.F90 !!---------------------------------------------------------------------- CONTAINS SUBROUTINE dyn_nxt ( kt ) !!---------------------------------------------------------------------- !! *** ROUTINE dyn_nxt *** !! !! ** 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) !! Note that if lk_dynspg_flt=T, the time stepping has already been !! performed in dynspg module !! 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 !! ! 02-10 (C. Talandier, A-M. Treguier) Open boundary cond. !! 9.0 ! 05-11 (V. Garnier) Surface pressure gradient organization !!---------------------------------------------------------------------- !! * 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 : time stepping' 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 ! ------------- #if defined key_dynspg_flt ! Leap-frog time stepping already done in dynspg.F routine #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 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 # if defined key_obc ! ! =============== END DO ! End of slab ! ! =============== ! Update (ua,va) along open boundaries (only in the rigid-lid case) CALL obc_dyn( kt ) IF ( lk_dynspg_exp .OR. lk_dynspg_ts ) THEN !Flather boundary condition : ! - Update sea surface height on each open boundary ! sshn (= after ssh) for explicit case ! sshn_b (= after ssha_b) for time-splitting case ! - Correct the barotropic velocities CALL obc_dyn_bt( kt ) !Boundary conditions on sshn ( after ssh) CALL lbc_lnk( sshn, 'T', 1. ) IF(ln_ctl) THEN ! print sum trends (used for debugging) CALL prt_ctl(tab2d_1=sshn, clinfo1=' ssh : ', mask1=tmask) ENDIF IF ( ln_vol_cst ) CALL obc_vol( kt ) ENDIF ! ! =============== DO jk = 1, jpkm1 ! Horizontal slab ! ! =============== # endif # if defined key_agrif ! ! =============== END DO ! End of slab ! ! =============== ! Update (ua,va) along open boundaries (only in the rigid-lid case) CALL Agrif_dyn( kt ) ! ! =============== DO jk = 1, jpkm1 ! Horizontal slab ! ! =============== # endif #endif ! 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 - Un: ', mask1=umask, & & tab3d_2=vn, clinfo2=' Vn: ', mask2=vmask) ENDIF #if defined key_agrif IF (.NOT.Agrif_Root()) CALL Agrif_Update_Dyn( kt ) #endif END SUBROUTINE dyn_nxt !!====================================================================== END MODULE dynnxt