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C $Header: /u/gcmpack/MITgcm/model/src/forward_step.F,v 1.27 2001/12/11 14:58:46 jmc Exp $ |
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C $Name: $ |
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|
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#include "CPP_OPTIONS.h" |
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|
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CBOP |
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C !ROUTINE: FORWARD_STEP |
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C !INTERFACE: |
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SUBROUTINE FORWARD_STEP( iloop, myTime, myIter, myThid ) |
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|
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C !DESCRIPTION: \bv |
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C *================================================================== |
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C | SUBROUTINE forward_step |
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C | o Run the ocean model and, optionally, evaluate a cost function. |
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C *================================================================== |
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C | |
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C | THE_MAIN_LOOP is the toplevel routine for the Tangent Linear and |
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C | Adjoint Model Compiler (TAMC). For this purpose the initialization |
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C | of the model was split into two parts. Those parameters that do |
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C | not depend on a specific model run are set in INITIALISE_FIXED, |
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C | whereas those that do depend on the specific realization are |
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C | initialized in INITIALISE_VARIA. |
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C | |
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C *================================================================== |
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C \ev |
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|
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C !USES: |
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IMPLICIT NONE |
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C == Global variables == |
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#include "SIZE.h" |
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#include "EEPARAMS.h" |
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#include "PARAMS.h" |
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#include "DYNVARS.h" |
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#include "FFIELDS.h" |
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|
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#ifdef ALLOW_NONHYDROSTATIC |
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#include "CG3D.h" |
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#endif |
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|
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#ifdef ALLOW_SHAP_FILT |
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#include "SHAP_FILT.h" |
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#endif |
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#ifdef ALLOW_ZONAL_FILT |
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#include "ZONAL_FILT.h" |
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#endif |
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|
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#ifdef ALLOW_AUTODIFF_TAMC |
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#include "tamc.h" |
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#include "ctrl.h" |
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#include "ctrl_dummy.h" |
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#include "cost.h" |
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#endif |
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|
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C !LOCAL VARIABLES: |
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C == Routine arguments == |
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C note: under the multi-threaded model myiter and |
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C mytime are local variables passed around as routine |
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C arguments. Although this is fiddly it saves the need to |
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C impose additional synchronisation points when they are |
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C updated. |
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C myiter - iteration counter for this thread |
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C mytime - time counter for this thread |
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C mythid - thread number for this instance of the routine. |
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integer iloop |
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integer mythid |
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integer myiter |
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_RL mytime |
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INTEGER bi,bj |
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|
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CEOP |
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|
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|
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#ifdef ALLOW_AUTODIFF_TAMC |
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C-- Reset the model iteration counter and the model time. |
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myiter = nIter0 + (iloop-1) |
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mytime = startTime + float(iloop-1)*deltaTclock |
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#endif |
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|
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#ifdef ALLOW_AUTODIFF_TAMC |
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C Include call to a dummy routine. Its adjoint will be |
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C called at the proper place in the adjoint code. |
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C The adjoint routine will print out adjoint values |
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C if requested. The location of the call is important, |
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C it has to be after the adjoint of the exchanges |
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C (DO_GTERM_BLOCKING_EXCHANGES). |
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CALL DUMMY_IN_STEPPING( myTime, myIter, myThid ) |
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CALL DO_FIELDS_BLOCKING_EXCHANGES( myThid ) |
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#endif |
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|
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#ifdef EXACT_CONSERV |
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IF (exactConserv) THEN |
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C-- Update etaH(n+1) : |
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DO bj=myByLo(myThid),myByHi(myThid) |
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DO bi=myBxLo(myThid),myBxHi(myThid) |
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CALL CALC_EXACT_ETA( .FALSE., bi,bj, uVel,vVel, |
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I startTime, nIter0, myThid ) |
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ENDDO |
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ENDDO |
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IF (implicDiv2Dflow .NE. 1. _d 0 ) |
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& _EXCH_XY_R8(etaH, myThid ) |
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ENDIF |
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#endif /* EXACT_CONSERV */ |
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|
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#ifdef NONLIN_FRSURF |
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C-- compute the future surface level thickness |
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C according to etaH(n+1) |
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IF ( nonlinFreeSurf.GT.0) THEN |
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CALL CALC_SURF_DR(etaH, myTime, myIter, myThid ) |
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ENDIF |
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#endif /* NONLIN_FRSURF */ |
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|
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C-- Load forcing/external data fields. |
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#ifdef INCLUDE_EXTERNAL_FORCING_PACKAGE |
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C NOTE, that although the exf package is part of the |
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C distribution, it is not currently maintained, i.e. |
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C exf is disabled by default in genmake. |
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#ifdef ALLOW_AUTODIFF_TAMC |
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c************************************** |
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#include "checkpoint_lev1_directives.h" |
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c************************************** |
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#endif |
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CALL EXF_GETFORCING( mytime, myiter, mythid ) |
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#else |
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CALL TIMER_START('EXTERNAL_FIELDS_LOAD[THE_MAIN_LOOP]',mythid) |
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CALL EXTERNAL_FIELDS_LOAD( mytime, myiter, mythid ) |
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CALL TIMER_STOP ('EXTERNAL_FIELDS_LOAD[THE_MAIN_LOOP]',mythid) |
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#endif |
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|
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C-- Step forward fields and calculate time tendency terms. |
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CALL TIMER_START('THERMODYNAMICS [THE_MAIN_LOOP]',mythid) |
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CALL THERMODYNAMICS( myTime, myIter, myThid ) |
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CALL TIMER_STOP ('THERMODYNAMICS [THE_MAIN_LOOP]',mythid) |
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|
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#ifdef ALLOW_SHAP_FILT |
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IF (useSHAP_FILT .AND. |
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& staggerTimeStep .AND. shap_filt_TrStagg ) THEN |
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CALL TIMER_START('SHAP_FILT [THE_MAIN_LOOP]',myThid) |
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CALL SHAP_FILT_APPLY_TS( gT, gS, myTime, myIter, myThid ) |
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CALL TIMER_STOP ('SHAP_FILT [THE_MAIN_LOOP]',myThid) |
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ENDIF |
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#endif |
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#ifdef ALLOW_ZONAL_FILT |
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IF (useZONAL_FILT .AND. |
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& staggerTimeStep .AND. zonal_filt_TrStagg ) THEN |
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CALL TIMER_START('ZONAL_FILT_APPLY [THE_MAIN_LOOP]',myThid) |
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CALL ZONAL_FILT_APPLY_TS( gT, gS, myThid ) |
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CALL TIMER_STOP ('ZONAL_FILT_APPLY [THE_MAIN_LOOP]',myThid) |
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ENDIF |
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#endif |
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|
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C-- Step forward fields and calculate time tendency terms. |
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IF ( momStepping ) THEN |
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CALL TIMER_START('DYNAMICS [THE_MAIN_LOOP]',mythid) |
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CALL DYNAMICS( myTime, myIter, myThid ) |
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CALL TIMER_STOP ('DYNAMICS [THE_MAIN_LOOP]',mythid) |
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ENDIF |
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|
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#ifdef ALLOW_NONHYDROSTATIC |
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C-- Step forward W field in N-H algorithm |
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IF ( momStepping .AND. nonHydrostatic ) THEN |
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CALL TIMER_START('CALC_GW [THE_MAIN_LOOP]',myThid) |
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CALL CALC_GW(myThid) |
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CALL TIMER_STOP ('CALC_GW [THE_MAIN_LOOP]',myThid) |
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ENDIF |
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#endif |
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|
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#ifdef NONLIN_FRSURF |
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C-- update hfacC,W,S and recip_hFac according to etaH(n+1) : |
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IF ( momStepping ) THEN |
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IF ( nonlinFreeSurf.GT.0) THEN |
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CALL UPDATE_SURF_DR( myTime, myIter, myThid ) |
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ENDIF |
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C- update also CG2D matrix (and preconditioner) |
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IF ( nonlinFreeSurf.GT.2) THEN |
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CALL UPDATE_CG2D( myTime, myIter, myThid ) |
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ENDIF |
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ENDIF |
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#endif |
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|
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C-- Apply Filters to u*,v* before SOLVE_FOR_PRESSURE |
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#ifdef ALLOW_SHAP_FILT |
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IF (useSHAP_FILT .AND. shap_filt_uvStar) THEN |
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CALL TIMER_START('SHAP_FILT [THE_MAIN_LOOP]',myThid) |
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CALL SHAP_FILT_APPLY_UV( gUnm1,gVnm1, myTime,myIter,myThid ) |
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IF (implicDiv2Dflow.LT.1.) THEN |
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C-- Explicit+Implicit part of the Barotropic Flow Divergence |
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C => Filtering of uVel,vVel is necessary |
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CALL SHAP_FILT_APPLY_UV( uVel,vVel, myTime,myIter,myThid ) |
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ENDIF |
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CALL TIMER_STOP ('SHAP_FILT [THE_MAIN_LOOP]',myThid) |
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ENDIF |
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#endif |
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#ifdef ALLOW_ZONAL_FILT |
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IF (useZONAL_FILT .AND. zonal_filt_uvStar) THEN |
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CALL TIMER_START('ZONAL_FILT_APPLY [THE_MAIN_LOOP]',myThid) |
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CALL ZONAL_FILT_APPLY_UV( gUnm1, gVnm1, myThid ) |
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IF (implicDiv2Dflow.LT.1.) THEN |
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C-- Explicit+Implicit part of the Barotropic Flow Divergence |
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C => Filtering of uVel,vVel is necessary |
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CALL ZONAL_FILT_APPLY_UV( uVel, vVel, myThid ) |
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ENDIF |
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CALL TIMER_STOP ('ZONAL_FILT_APPLY [THE_MAIN_LOOP]',myThid) |
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ENDIF |
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#endif |
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|
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C-- Solve elliptic equation(s). |
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C Two-dimensional only for conventional hydrostatic or |
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C three-dimensional for non-hydrostatic and/or IGW scheme. |
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IF ( momStepping ) THEN |
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CALL TIMER_START('SOLVE_FOR_PRESSURE [THE_MAIN_LOOP]',myThid) |
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CALL SOLVE_FOR_PRESSURE( myThid ) |
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CALL TIMER_STOP ('SOLVE_FOR_PRESSURE [THE_MAIN_LOOP]',myThid) |
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ENDIF |
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|
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C-- Correct divergence in flow field and cycle time-stepping |
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C arrays (for all fields) ; update time-counter |
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myIter = nIter0 + iLoop |
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myTime = startTime + deltaTClock * float(iLoop) |
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CALL TIMER_START('THE_CORRECTION_STEP [THE_MAIN_LOOP]',myThid) |
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CALL THE_CORRECTION_STEP(myTime, myIter, myThid) |
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CALL TIMER_STOP ('THE_CORRECTION_STEP [THE_MAIN_LOOP]',myThid) |
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|
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C-- Do "blocking" sends and receives for tendency "overlap" terms |
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c CALL TIMER_START('BLOCKING_EXCHANGES [THE_MAIN_LOOP]',myThid) |
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c CALL DO_GTERM_BLOCKING_EXCHANGES( myThid ) |
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c CALL TIMER_STOP ('BLOCKING_EXCHANGES [THE_MAIN_LOOP]',myThid) |
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|
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C-- Do "blocking" sends and receives for field "overlap" terms |
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CALL TIMER_START('BLOCKING_EXCHANGES [THE_MAIN_LOOP]',myThid) |
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CALL DO_FIELDS_BLOCKING_EXCHANGES( myThid ) |
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CALL TIMER_STOP ('BLOCKING_EXCHANGES [THE_MAIN_LOOP]',myThid) |
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|
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#ifdef ALLOW_FLT |
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C-- Calculate float trajectories |
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IF (useFLT) THEN |
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CALL TIMER_START('FLOATS [THE_MAIN_LOOP]',myThid) |
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CALL FLT_MAIN(myIter,myTime, myThid) |
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CALL TIMER_STOP ('FLOATS [THE_MAIN_LOOP]',myThid) |
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ENDIF |
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#endif |
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|
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#ifndef EXCLUDE_MONITOR |
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C-- Check status of solution (statistics, cfl, etc...) |
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CALL MONITOR( myIter, myTime, myThid ) |
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#endif /* EXCLUDE_MONITOR */ |
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|
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#ifndef ALLOW_AUTODIFF_TAMC |
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C-- Do IO if needed. |
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CALL TIMER_START('DO_THE_MODEL_IO [THE_MAIN_LOOP]',myThid) |
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CALL DO_THE_MODEL_IO( myTime, myIter, myThid ) |
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CALL TIMER_STOP ('DO_THE_MODEL_IO [THE_MAIN_LOOP]',myThid) |
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|
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C-- Save state for restarts |
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C Note: (jmc: is it still the case after ckp35 ?) |
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C ===== |
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C Because of the ordering of the timestepping code and |
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C tendency term code at end of loop model arrays hold |
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C U,V,T,S at "time-level" N but gu, gv, gs, gt, guNM1,... |
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C at "time-level" N+1/2 (guNM1 at "time-level" N+1/2 is |
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C gu at "time-level" N-1/2) and etaN at "time-level" N+1/2. |
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C where N = I+timeLevBase-1 |
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C Thus a checkpoint contains U.0000000000, GU.0000000001 and |
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C etaN.0000000001 in the indexing scheme used for the model |
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C "state" files. This example is referred to as a checkpoint |
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C at time level 1 |
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CALL TIMER_START('WRITE_CHECKPOINT [THE_MAIN_LOOP]',myThid) |
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CALL WRITE_CHECKPOINT( |
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& .FALSE., myTime, myIter, myThid ) |
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CALL TIMER_STOP ('WRITE_CHECKPOINT [THE_MAIN_LOOP]',myThid) |
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|
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#endif /* ALLOW_AUTODIFF_TAMC */ |
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|
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END |
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