source: NEMO/branches/2020/dev_r13333_KERNEL-08_techene_gm_HPG_SPG/src/OCE/DYN/dynspg_exp.F90 @ 13362

Last change on this file since 13362 was 13362, checked in by techene, 8 weeks ago

horizontal surface pressure gradient is now added systematically (linear and non-linear case) to rhs when explicit time scheme, it is not removed in the non linear case when time splitting

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1MODULE dynspg_exp
2   !!======================================================================
3   !!                   ***  MODULE  dynspg_exp  ***
4   !! Ocean dynamics:  surface pressure gradient trend, explicit scheme
5   !!======================================================================
6   !! History :  2.0  !  2005-11  (V. Garnier, G. Madec, L. Bessieres) Original code
7   !!            3.2  !  2009-06  (G. Madec, M. Leclair, R. Benshila) introduce sshwzv module
8   !!----------------------------------------------------------------------
9
10   !!----------------------------------------------------------------------
11   !!   dyn_spg_exp  : update the momentum trend with the surface
12   !!                      pressure gradient in the free surface constant 
13   !!                      volume case with vector optimization
14   !!----------------------------------------------------------------------
15   USE oce             ! ocean dynamics and tracers
16   USE dom_oce         ! ocean space and time domain
17   USE sbc_oce         ! surface boundary condition: ocean
18   USE phycst          ! physical constants
19   !
20   USE in_out_manager  ! I/O manager
21   USE lib_mpp         ! distributed memory computing library
22   USE lbclnk          ! ocean lateral boundary conditions (or mpp link)
23   USE prtctl          ! Print control
24   USE iom             ! I/O library
25
26   IMPLICIT NONE
27   PRIVATE
28
29   PUBLIC   dyn_spg_exp   ! called in dynspg.F90
30
31   !! * Substitutions
32#  include "do_loop_substitute.h90"
33   !!----------------------------------------------------------------------
34   !! NEMO/OCE 4.0 , NEMO Consortium (2018)
35   !! $Id$
36   !! Software governed by the CeCILL license (see ./LICENSE)
37   !!----------------------------------------------------------------------
38CONTAINS
39
40   SUBROUTINE dyn_spg_exp( kt, Kmm, puu, pvv, Krhs )
41      !!----------------------------------------------------------------------
42      !!                  ***  routine dyn_spg_exp  ***
43      !!
44      !! ** Purpose :   Compute the now trend due to the surface pressure
45      !!              gradient in case of explicit free surface formulation and
46      !!              add it to the general trend of momentum equation.
47      !!
48      !! ** Method  :   Explicit free surface formulation. Add to the general
49      !!              momentum trend the surface pressure gradient :
50      !!                      (uu(rhs),vv(rhs)) = (uu(rhs),vv(rhs)) + (spgu,spgv)
51      !!              where spgu = -1/rho0 d/dx(ps) = -g/e1u di( ssh(now) )
52      !!                    spgv = -1/rho0 d/dy(ps) = -g/e2v dj( ssh(now) )
53      !!
54      !! ** Action :   (puu(:,:,:,Krhs),pvv(:,:,:,Krhs))   trend of horizontal velocity increased by
55      !!                         the surf. pressure gradient trend
56      !!---------------------------------------------------------------------
57      INTEGER                             , INTENT( in )  ::  kt        ! ocean time-step index
58      INTEGER                             , INTENT( in )  ::  Kmm, Krhs ! ocean time level indices
59      REAL(wp), DIMENSION(jpi,jpj,jpk,jpt), INTENT(inout) ::  puu, pvv  ! ocean velocities and RHS of momentum equation
60      !!
61      INTEGER ::   ji, jj, jk   ! dummy loop indices
62      REAL(wp), DIMENSION(jpi,jpj) ::   zpgu, zpgv   ! 2D workspace
63      !!----------------------------------------------------------------------
64      !
65      IF( kt == nit000 ) THEN
66         IF(lwp) WRITE(numout,*)
67         IF(lwp) WRITE(numout,*) 'dyn_spg_exp : surface pressure gradient trend'
68         IF(lwp) WRITE(numout,*) '~~~~~~~~~~~   (explicit free surface)'
69         !
70         zpgu(:,:) = 0._wp   ;   zpgv(:,:) = 0._wp
71         !
72         IF( .NOT.ln_linssh .AND. lwp ) WRITE(numout,*) '      non linear free surface: spg is included in dynhpg'
73      ENDIF
74      !
75      DO_2D( 0, 0, 0, 0 )
76         zpgu(ji,jj) = - grav * ( ssh(ji+1,jj,Kmm) - ssh(ji,jj,Kmm) ) * r1_e1u(ji,jj)
77         zpgv(ji,jj) = - grav * ( ssh(ji,jj+1,Kmm) - ssh(ji,jj,Kmm) ) * r1_e2v(ji,jj)
78      END_2D
79      !
80      DO_3D( 0, 0, 0, 0, 1, jpkm1 )
81         puu(ji,jj,jk,Krhs) = puu(ji,jj,jk,Krhs) + zpgu(ji,jj)
82         pvv(ji,jj,jk,Krhs) = pvv(ji,jj,jk,Krhs) + zpgv(ji,jj)
83      END_3D
84      !
85   END SUBROUTINE dyn_spg_exp
86
87   !!======================================================================
88END MODULE dynspg_exp
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