/[MITgcm]/MITgcm/pkg/seaice/seaice_jfnk.F
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revision 1.16 by mlosch, Thu Jan 17 08:51:15 2013 UTC revision 1.20 by jmc, Sat Mar 2 04:35:05 2013 UTC
# Line 78  C     parameters to compute convergence Line 78  C     parameters to compute convergence
78        _RL     phi_e, alp_e, JFNKgamma_lin        _RL     phi_e, alp_e, JFNKgamma_lin
79        _RL     FGMRESeps        _RL     FGMRESeps
80        _RL     JFNKtol        _RL     JFNKtol
81  C      
82        _RL     recip_deltaT        _RL     recip_deltaT
83        LOGICAL JFNKconverged, krylovConverged        LOGICAL JFNKconverged, krylovConverged
84        LOGICAL writeNow        LOGICAL writeNow
85        CHARACTER*(MAX_LEN_MBUF) msgBuf        CHARACTER*(MAX_LEN_MBUF) msgBuf
86  C  
87  C     u/vIceRes :: residual of sea-ice momentum equations  C     u/vIceRes :: residual of sea-ice momentum equations
88        _RL uIceRes(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)        _RL uIceRes(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
89        _RL vIceRes(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)        _RL vIceRes(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
 C     vector version of the residuals  
       _RL resTmp (nVec,1,nSx,nSy)  
90  C     du/vIce   :: ice velocity increment to be added to u/vIce  C     du/vIce   :: ice velocity increment to be added to u/vIce
91        _RL duIce  (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)        _RL duIce  (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
92        _RL dvIce  (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)        _RL dvIce  (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
93  C     precomputed (= constant per Newton iteration) versions of  C     precomputed (= constant per Newton iteration) versions of
94  C     zeta, eta, and DWATN, press  C     zeta, eta, and DWATN, press
95        _RL zetaPre (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)        _RL zetaPre (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
96        _RL etaPre  (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)        _RL etaPre  (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
# Line 117  C     with iOutFgmres=1, seaice_fgmres p Line 115  C     with iOutFgmres=1, seaice_fgmres p
115       &     DIFFERENT_MULTIPLE( SEAICE_monFreq, myTime, deltaTClock ) )       &     DIFFERENT_MULTIPLE( SEAICE_monFreq, myTime, deltaTClock ) )
116       &     iOutFGMRES=1       &     iOutFGMRES=1
117    
 C      
118        DO bj=myByLo(myThid),myByHi(myThid)        DO bj=myByLo(myThid),myByHi(myThid)
119         DO bi=myBxLo(myThid),myBxHi(myThid)         DO bi=myBxLo(myThid),myBxHi(myThid)
120          DO J=1-Oly,sNy+Oly          DO J=1-OLy,sNy+OLy
121           DO I=1-Olx,sNx+Olx           DO I=1-OLx,sNx+OLx
122            uIceRes(I,J,bi,bj) = 0. _d 0            uIceRes(I,J,bi,bj) = 0. _d 0
123            vIceRes(I,J,bi,bj) = 0. _d 0            vIceRes(I,J,bi,bj) = 0. _d 0
124            duIce  (I,J,bi,bj) = 0. _d 0            duIce  (I,J,bi,bj) = 0. _d 0
# Line 131  C Line 128  C
128           ENDDO           ENDDO
129          ENDDO          ENDDO
130  C     Compute things that do no change during the Newton iteration:  C     Compute things that do no change during the Newton iteration:
131  C     sea-surface tilt and wind stress:  C     sea-surface tilt and wind stress:
132  C     FORCEX/Y0 - mass*(u/vIceNm1)/deltaT  C     FORCEX/Y0 - mass*(u/vIceNm1)/deltaT
133          DO J=1-Oly,sNy+Oly          DO J=1-OLy,sNy+OLy
134           DO I=1-Olx,sNx+Olx           DO I=1-OLx,sNx+OLx
135            FORCEX(I,J,bi,bj) = FORCEX0(I,J,bi,bj)            FORCEX(I,J,bi,bj) = FORCEX0(I,J,bi,bj)
136       &         + seaiceMassU(I,J,bi,bj)*uIceNm1(I,J,bi,bj)*recip_deltaT           &         + seaiceMassU(I,J,bi,bj)*uIceNm1(I,J,bi,bj)*recip_deltaT
137            FORCEY(I,J,bi,bj) = FORCEY0(I,J,bi,bj)            FORCEY(I,J,bi,bj) = FORCEY0(I,J,bi,bj)
138       &         + seaiceMassV(I,J,bi,bj)*vIceNm1(I,J,bi,bj)*recip_deltaT           &         + seaiceMassV(I,J,bi,bj)*vIceNm1(I,J,bi,bj)*recip_deltaT
139           ENDDO           ENDDO
140          ENDDO          ENDDO
141         ENDDO         ENDDO
# Line 149  C     Start nonlinear Newton iteration: Line 146  C     Start nonlinear Newton iteration:
146         newtonIter = newtonIter + 1         newtonIter = newtonIter + 1
147  C     Compute initial residual F(u), (includes computation of global  C     Compute initial residual F(u), (includes computation of global
148  C     variables DWATN, zeta, and eta)  C     variables DWATN, zeta, and eta)
149         IF ( newtonIter .EQ. 1 ) CALL SEAICE_JFNK_UPDATE(         IF ( newtonIter .EQ. 1 ) CALL SEAICE_JFNK_UPDATE(
150       I      duIce, dvIce,       I      duIce, dvIce,
151       U      uIce, vIce, JFNKresidual,       U      uIce, vIce, JFNKresidual,
152       O      uIceRes, vIceRes,       O      uIceRes, vIceRes,
153       I      newtonIter, myTime, myIter, myThid )       I      newtonIter, myTime, myIter, myThid )
# Line 158  C     local copies of precomputed coeffi Line 155  C     local copies of precomputed coeffi
155  C     constant for the preconditioner  C     constant for the preconditioner
156         DO bj=myByLo(myThid),myByHi(myThid)         DO bj=myByLo(myThid),myByHi(myThid)
157          DO bi=myBxLo(myThid),myBxHi(myThid)          DO bi=myBxLo(myThid),myBxHi(myThid)
158           DO j=1-Oly,sNy+Oly           DO j=1-OLy,sNy+OLy
159            DO i=1-Olx,sNx+Olx            DO i=1-OLx,sNx+OLx
160             zetaPre(I,J,bi,bj) =  zeta(I,J,bi,bj)             zetaPre(I,J,bi,bj) =  zeta(I,J,bi,bj)
161              etaPre(I,J,bi,bj) =   eta(I,J,bi,bj)              etaPre(I,J,bi,bj) =   eta(I,J,bi,bj)
162             etaZPre(I,J,bi,bj) =  etaZ(I,J,bi,bj)             etaZPre(I,J,bi,bj) =  etaZ(I,J,bi,bj)
# Line 170  C     constant for the preconditioner Line 167  C     constant for the preconditioner
167         ENDDO         ENDDO
168  C     compute convergence criterion for linear preconditioned FGMRES  C     compute convergence criterion for linear preconditioned FGMRES
169         JFNKgamma_lin = JFNKgamma_lin_max         JFNKgamma_lin = JFNKgamma_lin_max
170         IF ( newtonIter.GT.1.AND.newtonIter.LE.100         IF ( newtonIter.GT.1.AND.newtonIter.LE.SEAICE_JFNK_tolIter
171       &      .AND.JFNKresidual.LT.JFNKres_t ) THEN       &      .AND.JFNKresidual.LT.JFNKres_t ) THEN
172  C     Eisenstat, 1996, equ.(2.6)        C     Eisenstat, 1996, equ.(2.6)
173          phi_e = 1. _d 0          phi_e = 1. _d 0
174          alp_e = 1. _d 0          alp_e = 1. _d 0
175          JFNKgamma_lin = phi_e*( JFNKresidual/JFNKresidualKm1 )**alp_e          JFNKgamma_lin = phi_e*( JFNKresidual/JFNKresidualKm1 )**alp_e
# Line 181  C     Eisenstat, 1996, equ.(2.6) Line 178  C     Eisenstat, 1996, equ.(2.6)
178         ENDIF         ENDIF
179  C     save the residual for the next iteration  C     save the residual for the next iteration
180         JFNKresidualKm1 = JFNKresidual         JFNKresidualKm1 = JFNKresidual
181  C  
182  C     The Krylov iteration using FGMRES, the preconditioner is LSOR  C     The Krylov iteration using FGMRES, the preconditioner is LSOR
183  C     for now. The code is adapted from SEAICE_LSR, but heavily stripped  C     for now. The code is adapted from SEAICE_LSR, but heavily stripped
184  C     down.  C     down.
# Line 189  C     krylovIter is mapped into "its" in Line 186  C     krylovIter is mapped into "its" in
186  C     in that routine  C     in that routine
187         krylovIter    = 0         krylovIter    = 0
188         iCode         = 0         iCode         = 0
189  C  
190         JFNKconverged = JFNKresidual.LT.JFNKtol         JFNKconverged = JFNKresidual.LT.JFNKtol
191  C  
192  C     do Krylov loop only if convergence is not reached  C     do Krylov loop only if convergence is not reached
193  C  
194         IF ( .NOT.JFNKconverged ) THEN         IF ( .NOT.JFNKconverged ) THEN
195  C  
196  C     start Krylov iteration (FGMRES)  C     start Krylov iteration (FGMRES)
197  C  
198          krylovConverged = .FALSE.          krylovConverged = .FALSE.
199          FGMRESeps = JFNKgamma_lin * JFNKresidual          FGMRESeps = JFNKgamma_lin * JFNKresidual
200          DO WHILE ( .NOT.krylovConverged )          DO WHILE ( .NOT.krylovConverged )
201  C     solution vector sol = du/vIce  C     solution vector sol = du/vIce
202  C     residual vector (rhs) Fu = u/vIceRes  C     residual vector (rhs) Fu = u/vIceRes
203  C     output work vectors wk1, -> input work vector wk2  C     output work vectors wk1, -> input work vector wk2
204  C      
205           CALL SEAICE_FGMRES_DRIVER(           CALL SEAICE_FGMRES_DRIVER(
206       I        uIceRes, vIceRes,       I        uIceRes, vIceRes,
207       U        duIce, dvIce, iCode,       U        duIce, dvIce, iCode,
208       I        FGMRESeps, iOutFGMRES,       I        FGMRESeps, iOutFGMRES,
209       I        newtonIter, krylovIter, myTime, myIter, myThid )       I        newtonIter, krylovIter, myTime, myIter, myThid )
# Line 214  C     FGMRES returns iCode either asking Line 211  C     FGMRES returns iCode either asking
211  C     or product of matrix (Jacobian) times vector. For iCode = 0, terminate  C     or product of matrix (Jacobian) times vector. For iCode = 0, terminate
212  C     iteration  C     iteration
213           IF (iCode.EQ.1) THEN           IF (iCode.EQ.1) THEN
214  C     Call preconditioner  C     Call preconditioner
215            IF ( SOLV_MAX_ITERS .GT. 0 )            IF ( SOLV_MAX_ITERS .GT. 0 )
216       &         CALL SEAICE_PRECONDITIONER(       &         CALL SEAICE_PRECONDITIONER(
217       U         duIce, dvIce,       U         duIce, dvIce,
218       I         zetaPre, etaPre, etaZpre, dwatPre,       I         zetaPre, etaPre, etaZpre, dwatPre,
219       I         newtonIter, krylovIter, myTime, myIter, myThid )       I         newtonIter, krylovIter, myTime, myIter, myThid )
220           ELSEIF (iCode.GE.2) THEN           ELSEIF (iCode.GE.2) THEN
221  C     Compute Jacobian times vector  C     Compute Jacobian times vector
222            CALL SEAICE_JACVEC(            CALL SEAICE_JACVEC(
223       I         uIce, vIce, uIceRes, vIceRes,       I         uIce, vIce, uIceRes, vIceRes,
224       U         duIce, dvIce,         U         duIce, dvIce,
225       I         newtonIter, krylovIter, myTime, myIter, myThid )       I         newtonIter, krylovIter, myTime, myIter, myThid )
226           ENDIF           ENDIF
227           krylovConverged = iCode.EQ.0           krylovConverged = iCode.EQ.0
# Line 234  C     End of Krylov iterate Line 231  C     End of Krylov iterate
231  C     some output diagnostics  C     some output diagnostics
232          IF ( debugLevel.GE.debLevA ) THEN          IF ( debugLevel.GE.debLevA ) THEN
233           _BEGIN_MASTER( myThid )           _BEGIN_MASTER( myThid )
234           totalNewtonItersLoc =           totalNewtonItersLoc =
235       &        SEAICEnewtonIterMax*(myIter-nIter0)+newtonIter       &        SEAICEnewtonIterMax*(myIter-nIter0)+newtonIter
236           WRITE(msgBuf,'(2A,2(1XI6),2E12.5)')           WRITE(msgBuf,'(2A,2(1XI6),2E12.5)')
237       &        ' S/R SEAICE_JFNK: Newton iterate / total, ',       &        ' S/R SEAICE_JFNK: Newton iterate / total, ',
238       &        'JFNKgamma_lin, initial norm = ',       &        'JFNKgamma_lin, initial norm = ',
239       &        newtonIter, totalNewtonItersLoc,       &        newtonIter, totalNewtonItersLoc,
# Line 244  C     some output diagnostics Line 241  C     some output diagnostics
241           CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,           CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
242       &        SQUEEZE_RIGHT, myThid )       &        SQUEEZE_RIGHT, myThid )
243           WRITE(msgBuf,'(3(A,I6))')           WRITE(msgBuf,'(3(A,I6))')
244       &        ' S/R SEAICE_JFNK: Newton iterate / total = ',newtonIter,       &        ' S/R SEAICE_JFNK: Newton iterate / total = ',newtonIter,
245       &        ' / ', totalNewtonItersLoc,       &        ' / ', totalNewtonItersLoc,
246       &        ', Nb. of FGMRES iterations = ', krylovIter       &        ', Nb. of FGMRES iterations = ', krylovIter
247           CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,           CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
# Line 254  C     some output diagnostics Line 251  C     some output diagnostics
251          IF ( krylovIter.EQ.SEAICEkrylovIterMax ) THEN          IF ( krylovIter.EQ.SEAICEkrylovIterMax ) THEN
252           krylovFails = krylovFails + 1           krylovFails = krylovFails + 1
253          ENDIF          ENDIF
254  C     Set the stopping criterion for the Newton iteration  C     Set the stopping criterion for the Newton iteration and the
255          IF ( newtonIter .EQ. 1 ) JFNKtol=JFNKgamma_nonlin*JFNKresidual  C     criterion for the transition from accurate to approximate FGMRES
256            IF ( newtonIter .EQ. 1 ) THEN
257             JFNKtol=JFNKgamma_nonlin*JFNKresidual
258             IF ( JFNKres_tFac .NE. UNSET_RL )
259         &        JFNKres_t = JFNKresidual * JFNKres_tFac
260            ENDIF
261  C     Update linear solution vector and return to Newton iteration  C     Update linear solution vector and return to Newton iteration
262  C     Do a linesearch if necessary, and compute a new residual.  C     Do a linesearch if necessary, and compute a new residual.
263  C     Note that it should be possible to do the following operations  C     Note that it should be possible to do the following operations
264  C     at the beginning of the Newton iteration, thereby saving us from  C     at the beginning of the Newton iteration, thereby saving us from
265  C     the extra call of seaice_jfnk_update, but unfortunately that  C     the extra call of seaice_jfnk_update, but unfortunately that
266  C     changes the results, so we leave the stuff here for now.  C     changes the results, so we leave the stuff here for now.
267          CALL SEAICE_JFNK_UPDATE(          CALL SEAICE_JFNK_UPDATE(
268       I       duIce, dvIce,       I       duIce, dvIce,
269       U       uIce, vIce, JFNKresidual,       U       uIce, vIce, JFNKresidual,
270       O       uIceRes, vIceRes,       O       uIceRes, vIceRes,
271       I       newtonIter, myTime, myIter, myThid )       I       newtonIter, myTime, myIter, myThid )
272  C     reset du/vIce here instead of setting sol = 0 in seaice_fgmres_driver  C     reset du/vIce here instead of setting sol = 0 in seaice_fgmres_driver
273          DO bj=myByLo(myThid),myByHi(myThid)          DO bj=myByLo(myThid),myByHi(myThid)
274           DO bi=myBxLo(myThid),myBxHi(myThid)           DO bi=myBxLo(myThid),myBxHi(myThid)
275            DO J=1-Oly,sNy+Oly            DO J=1-OLy,sNy+OLy
276             DO I=1-Olx,sNx+Olx             DO I=1-OLx,sNx+OLx
277              duIce(I,J,bi,bj)= 0. _d 0              duIce(I,J,bi,bj)= 0. _d 0
278              dvIce(I,J,bi,bj)= 0. _d 0              dvIce(I,J,bi,bj)= 0. _d 0
279             ENDDO             ENDDO
# Line 281  C     reset du/vIce here instead of sett Line 283  C     reset du/vIce here instead of sett
283         ENDIF         ENDIF
284  C     end of Newton iterate  C     end of Newton iterate
285        ENDDO        ENDDO
286  C  
287  C--   Output diagnostics  C--   Output diagnostics
288  C  
289        IF ( SEAICE_monFreq .GT. 0. _d 0 ) THEN        IF ( SEAICE_monFreq .GT. 0. _d 0 ) THEN
290  C     Count iterations  C     Count iterations
291         totalJFNKtimeSteps = totalJFNKtimeSteps + 1         totalJFNKtimeSteps = totalJFNKtimeSteps + 1
# Line 292  C     Count iterations Line 294  C     Count iterations
294  C     Record failure  C     Record failure
295         totalKrylovFails   = totalKrylovFails + krylovFails         totalKrylovFails   = totalKrylovFails + krylovFails
296         IF ( newtonIter .EQ. SEAICEnewtonIterMax ) THEN         IF ( newtonIter .EQ. SEAICEnewtonIterMax ) THEN
297          totalNewtonFails = totalNewtonFails + 1          totalNewtonFails = totalNewtonFails + 1
298         ENDIF         ENDIF
299        ENDIF        ENDIF
300  C     Decide whether it is time to dump and reset the counter  C     Decide whether it is time to dump and reset the counter
301        writeNow = DIFFERENT_MULTIPLE(SEAICE_monFreq,        writeNow = DIFFERENT_MULTIPLE(SEAICE_monFreq,
302       &     myTime+deltaTClock, deltaTClock)       &     myTime+deltaTClock, deltaTClock)
303  #ifdef ALLOW_CAL  #ifdef ALLOW_CAL
304        IF ( useCAL ) THEN        IF ( useCAL ) THEN
305         CALL CAL_TIME2DUMP(         CALL CAL_TIME2DUMP(
306       I      zeroRL, SEAICE_monFreq,  deltaTClock,       I      zeroRL, SEAICE_monFreq,  deltaTClock,
307       U      writeNow,       U      writeNow,
308       I      myTime+deltaTclock, myIter+1, myThid )       I      myTime+deltaTclock, myIter+1, myThid )
# Line 308  C     Decide whether it is time to dump Line 310  C     Decide whether it is time to dump
310  #endif  #endif
311        IF ( writeNow ) THEN        IF ( writeNow ) THEN
312         _BEGIN_MASTER( myThid )         _BEGIN_MASTER( myThid )
313         WRITE(msgBuf,'(A)')         WRITE(msgBuf,'(A)')
314       &' // ======================================================='       &' // ======================================================='
315         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
316       &      SQUEEZE_RIGHT, myThid )       &      SQUEEZE_RIGHT, myThid )
317         WRITE(msgBuf,'(A)') ' // Begin JFNK statistics'         WRITE(msgBuf,'(A)') ' // Begin JFNK statistics'
318         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
319       &      SQUEEZE_RIGHT, myThid )       &      SQUEEZE_RIGHT, myThid )
320         WRITE(msgBuf,'(A)')         WRITE(msgBuf,'(A)')
321       &' // ======================================================='       &' // ======================================================='
322         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
323       &      SQUEEZE_RIGHT, myThid )       &      SQUEEZE_RIGHT, myThid )
324         WRITE(msgBuf,'(A,I10)')         WRITE(msgBuf,'(A,I10)')
325       &      ' %JFNK_MON: time step              = ', myIter+1       &      ' %JFNK_MON: time step              = ', myIter+1
326         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
327       &      SQUEEZE_RIGHT, myThid )       &      SQUEEZE_RIGHT, myThid )
328         WRITE(msgBuf,'(A,I10)')         WRITE(msgBuf,'(A,I10)')
329       &      ' %JFNK_MON: Nb. of time steps      = ', totalJFNKtimeSteps       &      ' %JFNK_MON: Nb. of time steps      = ', totalJFNKtimeSteps
330         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
331       &      SQUEEZE_RIGHT, myThid )       &      SQUEEZE_RIGHT, myThid )
332         WRITE(msgBuf,'(A,I10)')         WRITE(msgBuf,'(A,I10)')
333       &      ' %JFNK_MON: Nb. of Newton steps    = ', totalNewtonIters       &      ' %JFNK_MON: Nb. of Newton steps    = ', totalNewtonIters
334         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
335       &      SQUEEZE_RIGHT, myThid )       &      SQUEEZE_RIGHT, myThid )
336         WRITE(msgBuf,'(A,I10)')         WRITE(msgBuf,'(A,I10)')
337       &      ' %JFNK_MON: Nb. of Krylov steps    = ', totalKrylovIters       &      ' %JFNK_MON: Nb. of Krylov steps    = ', totalKrylovIters
338         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
339       &      SQUEEZE_RIGHT, myThid )       &      SQUEEZE_RIGHT, myThid )
340         WRITE(msgBuf,'(A,I10)')         WRITE(msgBuf,'(A,I10)')
341       &      ' %JFNK_MON: Nb. of Newton failures = ', totalNewtonFails       &      ' %JFNK_MON: Nb. of Newton failures = ', totalNewtonFails
342         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
343       &      SQUEEZE_RIGHT, myThid )       &      SQUEEZE_RIGHT, myThid )
344         WRITE(msgBuf,'(A,I10)')         WRITE(msgBuf,'(A,I10)')
345       &      ' %JFNK_MON: Nb. of Krylov failures = ', totalKrylovFails       &      ' %JFNK_MON: Nb. of Krylov failures = ', totalKrylovFails
346         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
347       &      SQUEEZE_RIGHT, myThid )       &      SQUEEZE_RIGHT, myThid )
348         WRITE(msgBuf,'(A)')         WRITE(msgBuf,'(A)')
349       &' // ======================================================='       &' // ======================================================='
350         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
351       &      SQUEEZE_RIGHT, myThid )       &      SQUEEZE_RIGHT, myThid )
352         WRITE(msgBuf,'(A)') ' // End JFNK statistics'         WRITE(msgBuf,'(A)') ' // End JFNK statistics'
353         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
354       &      SQUEEZE_RIGHT, myThid )       &      SQUEEZE_RIGHT, myThid )
355         WRITE(msgBuf,'(A)')         WRITE(msgBuf,'(A)')
356       &' // ======================================================='       &' // ======================================================='
357         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
358       &      SQUEEZE_RIGHT, myThid )       &      SQUEEZE_RIGHT, myThid )
# Line 367  C     Print more debugging information Line 369  C     Print more debugging information
369        IF ( debugLevel.GE.debLevA ) THEN        IF ( debugLevel.GE.debLevA ) THEN
370         IF ( newtonIter .EQ. SEAICEnewtonIterMax ) THEN         IF ( newtonIter .EQ. SEAICEnewtonIterMax ) THEN
371          _BEGIN_MASTER( myThid )          _BEGIN_MASTER( myThid )
372          WRITE(msgBuf,'(A,I10)')          WRITE(msgBuf,'(A,I10)')
373       &       ' S/R SEAICE_JFNK: JFNK did not converge in timestep ',       &       ' S/R SEAICE_JFNK: JFNK did not converge in timestep ',
374       &       myIter+1       &       myIter+1
375          CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,          CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
# Line 376  C     Print more debugging information Line 378  C     Print more debugging information
378         ENDIF         ENDIF
379         IF ( krylovFails .GT. 0 ) THEN         IF ( krylovFails .GT. 0 ) THEN
380          _BEGIN_MASTER( myThid )          _BEGIN_MASTER( myThid )
381          WRITE(msgBuf,'(A,I4,A,I10)')          WRITE(msgBuf,'(A,I4,A,I10)')
382       &       ' S/R SEAICE_JFNK: FGMRES did not converge ',       &       ' S/R SEAICE_JFNK: FGMRES did not converge ',
383       &       krylovFails, ' times in timestep ', myIter+1       &       krylovFails, ' times in timestep ', myIter+1
384          CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,          CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
# Line 384  C     Print more debugging information Line 386  C     Print more debugging information
386          _END_MASTER( myThid )          _END_MASTER( myThid )
387         ENDIF         ENDIF
388         _BEGIN_MASTER( myThid )         _BEGIN_MASTER( myThid )
389         WRITE(msgBuf,'(A,I6,A,I10)')         WRITE(msgBuf,'(A,I6,A,I10)')
390       &      ' S/R SEAICE_JFNK: Total number FGMRES iterations = ',       &      ' S/R SEAICE_JFNK: Total number FGMRES iterations = ',
391       &      totalKrylovItersLoc, ' in timestep ', myIter+1       &      totalKrylovItersLoc, ' in timestep ', myIter+1
392         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
# Line 400  CBOP Line 402  CBOP
402  C     !ROUTINE: SEAICE_JFNK_UPDATE  C     !ROUTINE: SEAICE_JFNK_UPDATE
403  C     !INTERFACE:  C     !INTERFACE:
404    
405        SUBROUTINE SEAICE_JFNK_UPDATE(        SUBROUTINE SEAICE_JFNK_UPDATE(
406       I     duIce, dvIce,       I     duIce, dvIce,
407       U     uIce, vIce, JFNKresidual,       U     uIce, vIce, JFNKresidual,
408       O     uIceRes, vIceRes,       O     uIceRes, vIceRes,
409       I     newtonIter, myTime, myIter, myThid )       I     newtonIter, myTime, myIter, myThid )
# Line 460  C     i,j,bi,bj :: loop indices Line 462  C     i,j,bi,bj :: loop indices
462        _RL     resLoc, facLS        _RL     resLoc, facLS
463        LOGICAL doLineSearch        LOGICAL doLineSearch
464  C     nVec    :: size of the input vector(s)  C     nVec    :: size of the input vector(s)
465  C     vector version of the residuals  C     resTmp  :: vector version of the residuals
466        INTEGER nVec        INTEGER nVec
467        PARAMETER ( nVec  = 2*sNx*sNy )        PARAMETER ( nVec  = 2*sNx*sNy )
468        _RL resTmp (nVec,1,nSx,nSy)        _RL resTmp (nVec,1,nSx,nSy)
469  C  
470        CHARACTER*(MAX_LEN_MBUF) msgBuf        CHARACTER*(MAX_LEN_MBUF) msgBuf
471  CEOP  CEOP
472    
# Line 474  C     Initialise some local variables Line 476  C     Initialise some local variables
476        facLS = 1. _d 0        facLS = 1. _d 0
477        doLineSearch = .TRUE.        doLineSearch = .TRUE.
478        DO WHILE ( doLineSearch )        DO WHILE ( doLineSearch )
 C     Determine, if we need more iterations  
        doLineSearch = resLoc .GE. JFNKresidual  
 C     Limit the maximum number of iterations arbitrarily to four  
        doLineSearch = doLineSearch .AND. l .LE. 4  
 C     For the first iteration du/vIce = 0 and there will be no  
 C     improvement of the residual possible, so we do only the first  
 C     iteration  
        IF ( newtonIter .EQ. 1 ) doLineSearch = .FALSE.  
 C     Only start a linesearch after some Newton iterations  
        IF ( newtonIter .LE. SEAICE_JFNK_lsIter ) doLineSearch = .FALSE.  
 C     Increment counter  
        l = l + 1  
479  C     Create update  C     Create update
480         DO bj=myByLo(myThid),myByHi(myThid)         DO bj=myByLo(myThid),myByHi(myThid)
481          DO bi=myBxLo(myThid),myBxHi(myThid)          DO bi=myBxLo(myThid),myBxHi(myThid)
482           DO J=1-Oly,sNy+Oly           DO J=1-OLy,sNy+OLy
483            DO I=1-Olx,sNx+Olx            DO I=1-OLx,sNx+OLx
484             uIce(I,J,bi,bj) = uIce(I,J,bi,bj)+facLS*duIce(I,J,bi,bj)             uIce(I,J,bi,bj) = uIce(I,J,bi,bj)+facLS*duIce(I,J,bi,bj)
485             vIce(I,J,bi,bj) = vIce(I,J,bi,bj)+facLS*dvIce(I,J,bi,bj)             vIce(I,J,bi,bj) = vIce(I,J,bi,bj)+facLS*dvIce(I,J,bi,bj)
486            ENDDO            ENDDO
# Line 499  C     Create update Line 489  C     Create update
489         ENDDO         ENDDO
490  C     Compute current residual F(u), (includes re-computation of global  C     Compute current residual F(u), (includes re-computation of global
491  C     variables DWATN, zeta, and eta, i.e. they are different after this)  C     variables DWATN, zeta, and eta, i.e. they are different after this)
492         CALL SEAICE_CALC_RESIDUAL(         CALL SEAICE_CALC_RESIDUAL(
493       I      uIce, vIce,       I      uIce, vIce,
494       O      uIceRes, vIceRes,       O      uIceRes, vIceRes,
495       I      newtonIter, 0, myTime, myIter, myThid )       I      newtonIter, 0, myTime, myIter, myThid )
496  C     Important: Compute the norm of the residual using the same scalar  C     Important: Compute the norm of the residual using the same scalar
497  C     product that SEAICE_FGMRES does  C     product that SEAICE_FGMRES does
498         CALL SEAICE_MAP2VEC(nVec,uIceRes,vIceRes,resTmp,.TRUE.,myThid)         CALL SEAICE_MAP2VEC(nVec,uIceRes,vIceRes,resTmp,.TRUE.,myThid)
499         CALL SEAICE_SCALPROD(nVec,1,1,1,resTmp,resTmp,resLoc,myThid)         CALL SEAICE_SCALPROD(nVec,1,1,1,resTmp,resTmp,resLoc,myThid)
500         resLoc = SQRT(resLoc)         resLoc = SQRT(resLoc)
501    C     Determine, if we need more iterations
502           doLineSearch = resLoc .GE. JFNKresidual
503    C     Limit the maximum number of iterations arbitrarily to four
504           doLineSearch = doLineSearch .AND. l .LT. 4
505    C     For the first iteration du/vIce = 0 and there will be no
506    C     improvement of the residual possible, so we do only the first
507    C     iteration
508           IF ( newtonIter .EQ. 1 ) doLineSearch = .FALSE.
509    C     Only start a linesearch after some Newton iterations
510           IF ( newtonIter .LE. SEAICE_JFNK_lsIter ) doLineSearch = .FALSE.
511    C     Increment counter
512           l = l + 1
513  C     some output diagnostics  C     some output diagnostics
514         IF ( debugLevel.GE.debLevA .AND. doLineSearch ) THEN         IF ( debugLevel.GE.debLevA .AND. doLineSearch ) THEN
515          _BEGIN_MASTER( myThid )          _BEGIN_MASTER( myThid )
516          WRITE(msgBuf,'(2A,2(1XI6),3E12.5)')          WRITE(msgBuf,'(2A,2(1XI6),3E12.5)')
517       &       ' S/R SEAICE_JFNK_UPDATE: Newton iter, LSiter, ',       &       ' S/R SEAICE_JFNK_UPDATE: Newton iter, LSiter, ',
518       &       'facLS, JFNKresidual, resLoc = ',       &       'facLS, JFNKresidual, resLoc = ',
519       &        newtonIter, l, facLS, JFNKresidual, resLoc       &        newtonIter, l, facLS, JFNKresidual, resLoc
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