/[MITgcm]/MITgcm/pkg/seaice/seaice_jfnk.F
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revision 1.17 by mlosch, Thu Jan 17 10:42:43 2013 UTC revision 1.25 by mlosch, Fri Feb 7 14:27:21 2014 UTC
# Line 53  C     myThid :: my Thread Id. number Line 53  C     myThid :: my Thread Id. number
53        INTEGER myIter        INTEGER myIter
54        INTEGER myThid        INTEGER myThid
55    
56  #if ( (defined SEAICE_CGRID) && \  #ifdef SEAICE_ALLOW_JFNK
       (defined SEAICE_ALLOW_JFNK) && \  
       (defined SEAICE_ALLOW_DYNAMICS) )  
57  C     !FUNCTIONS:  C     !FUNCTIONS:
58        LOGICAL  DIFFERENT_MULTIPLE        LOGICAL  DIFFERENT_MULTIPLE
59        EXTERNAL DIFFERENT_MULTIPLE        EXTERNAL DIFFERENT_MULTIPLE
# Line 75  C     FGMRES flag that indicates what fg Line 73  C     FGMRES flag that indicates what fg
73        _RL     JFNKresidual        _RL     JFNKresidual
74        _RL     JFNKresidualKm1        _RL     JFNKresidualKm1
75  C     parameters to compute convergence criterion  C     parameters to compute convergence criterion
76        _RL     phi_e, alp_e, JFNKgamma_lin        _RL     JFNKgamma_lin
77        _RL     FGMRESeps        _RL     FGMRESeps
78        _RL     JFNKtol        _RL     JFNKtol
79  C      C     backward differences extrapolation factors
80          _RL bdfFac, bdfAlpha
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)
90  C     vector version of the residuals  C     extra time level required for backward difference time stepping
91        _RL resTmp (nVec,1,nSx,nSy)        _RL duIcNm1(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
92          _RL dvIcNm1(1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
93  C     du/vIce   :: ice velocity increment to be added to u/vIce  C     du/vIce   :: ice velocity increment to be added to u/vIce
94        _RL duIce  (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)        _RL duIce  (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
95        _RL dvIce  (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)        _RL dvIce  (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
96  C     precomputed (= constant per Newton iteration) versions of  C     precomputed (= constant per Newton iteration) versions of
97  C     zeta, eta, and DWATN, press  C     zeta, eta, and DWATN, press
98        _RL zetaPre (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)        _RL zetaPre (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy)
99        _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 118  C     with iOutFgmres=1, seaice_fgmres p
118       &     DIFFERENT_MULTIPLE( SEAICE_monFreq, myTime, deltaTClock ) )       &     DIFFERENT_MULTIPLE( SEAICE_monFreq, myTime, deltaTClock ) )
119       &     iOutFGMRES=1       &     iOutFGMRES=1
120    
121  C      C     backward difference extrapolation factors
122          bdfFac = 0. _d 0
123          IF ( SEAICEuseBDF2 ) THEN
124           IF ( myIter.EQ.nIter0 .AND. SEAICEmomStartBDF.EQ.0 ) THEN
125            bdfFac = 0. _d 0
126           ELSE
127            bdfFac = 0.5 _d 0
128           ENDIF
129          ENDIF
130          bdfAlpha = 1. _d 0 + bdfFac
131    
132        DO bj=myByLo(myThid),myByHi(myThid)        DO bj=myByLo(myThid),myByHi(myThid)
133         DO bi=myBxLo(myThid),myBxHi(myThid)         DO bi=myBxLo(myThid),myBxHi(myThid)
134          DO J=1-Oly,sNy+Oly          DO J=1-OLy,sNy+OLy
135           DO I=1-Olx,sNx+Olx           DO I=1-OLx,sNx+OLx
136            uIceRes(I,J,bi,bj) = 0. _d 0            uIceRes(I,J,bi,bj) = 0. _d 0
137            vIceRes(I,J,bi,bj) = 0. _d 0            vIceRes(I,J,bi,bj) = 0. _d 0
138            duIce  (I,J,bi,bj) = 0. _d 0            duIce  (I,J,bi,bj) = 0. _d 0
139            dvIce  (I,J,bi,bj) = 0. _d 0            dvIce  (I,J,bi,bj) = 0. _d 0
140             ENDDO
141            ENDDO
142    C     cycle ice velocities
143            DO J=1-OLy,sNy+OLy
144             DO I=1-OLx,sNx+OLx
145              duIcNm1(I,J,bi,bj) = uIce(I,J,bi,bj) * bdfAlpha
146         &         + ( uIce(I,J,bi,bj) - uIceNm1(I,J,bi,bj) ) * bdfFac
147              dvIcNm1(I,J,bi,bj) = vIce(I,J,bi,bj) * bdfAlpha
148         &         + ( vIce(I,J,bi,bj) - vIceNm1(I,J,bi,bj) ) * bdfFac
149            uIceNm1(I,J,bi,bj) = uIce(I,J,bi,bj)            uIceNm1(I,J,bi,bj) = uIce(I,J,bi,bj)
150            vIceNm1(I,J,bi,bj) = vIce(I,J,bi,bj)            vIceNm1(I,J,bi,bj) = vIce(I,J,bi,bj)
151           ENDDO           ENDDO
152          ENDDO          ENDDO
153            IF ( .NOT.SEAICEuseIMEX ) THEN
154  C     Compute things that do no change during the Newton iteration:  C     Compute things that do no change during the Newton iteration:
155  C     sea-surface tilt and wind stress:  C     sea-surface tilt and wind stress:
156  C     FORCEX/Y0 - mass*(u/vIceNm1)/deltaT  C     FORCEX/Y0 - mass*(1.5*u/vIceNm1+0.5*(u/vIceNm1-u/vIceNm2))/deltaT
157          DO J=1-Oly,sNy+Oly          DO J=1-OLy,sNy+OLy
158           DO I=1-Olx,sNx+Olx           DO I=1-OLx,sNx+OLx
159            FORCEX(I,J,bi,bj) = FORCEX0(I,J,bi,bj)            FORCEX(I,J,bi,bj) = FORCEX0(I,J,bi,bj)
160       &         + seaiceMassU(I,J,bi,bj)*uIceNm1(I,J,bi,bj)*recip_deltaT           &         + seaiceMassU(I,J,bi,bj)*duIcNm1(I,J,bi,bj)*recip_deltaT
161            FORCEY(I,J,bi,bj) = FORCEY0(I,J,bi,bj)            FORCEY(I,J,bi,bj) = FORCEY0(I,J,bi,bj)
162       &         + seaiceMassV(I,J,bi,bj)*vIceNm1(I,J,bi,bj)*recip_deltaT           &         + seaiceMassV(I,J,bi,bj)*dvIcNm1(I,J,bi,bj)*recip_deltaT
163           ENDDO           ENDDO
164          ENDDO          ENDDO
165            ENDIF
166         ENDDO         ENDDO
167        ENDDO        ENDDO
168  C     Start nonlinear Newton iteration: outer loop iteration  C     Start nonlinear Newton iteration: outer loop iteration
# Line 149  C     Start nonlinear Newton iteration: Line 171  C     Start nonlinear Newton iteration:
171         newtonIter = newtonIter + 1         newtonIter = newtonIter + 1
172  C     Compute initial residual F(u), (includes computation of global  C     Compute initial residual F(u), (includes computation of global
173  C     variables DWATN, zeta, and eta)  C     variables DWATN, zeta, and eta)
174         IF ( newtonIter .EQ. 1 ) CALL SEAICE_JFNK_UPDATE(         IF ( newtonIter .EQ. 1 ) CALL SEAICE_JFNK_UPDATE(
175       I      duIce, dvIce,       I      duIce, dvIce,
176       U      uIce, vIce, JFNKresidual,       U      uIce, vIce, JFNKresidual,
177       O      uIceRes, vIceRes,       O      uIceRes, vIceRes,
178       I      newtonIter, myTime, myIter, myThid )       I      newtonIter, myTime, myIter, myThid )
# Line 158  C     local copies of precomputed coeffi Line 180  C     local copies of precomputed coeffi
180  C     constant for the preconditioner  C     constant for the preconditioner
181         DO bj=myByLo(myThid),myByHi(myThid)         DO bj=myByLo(myThid),myByHi(myThid)
182          DO bi=myBxLo(myThid),myBxHi(myThid)          DO bi=myBxLo(myThid),myBxHi(myThid)
183           DO j=1-Oly,sNy+Oly           DO j=1-OLy,sNy+OLy
184            DO i=1-Olx,sNx+Olx            DO i=1-OLx,sNx+OLx
185             zetaPre(I,J,bi,bj) =  zeta(I,J,bi,bj)             zetaPre(I,J,bi,bj) =  zeta(I,J,bi,bj)
186              etaPre(I,J,bi,bj) =   eta(I,J,bi,bj)              etaPre(I,J,bi,bj) =   eta(I,J,bi,bj)
187             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 192  C     constant for the preconditioner
192         ENDDO         ENDDO
193  C     compute convergence criterion for linear preconditioned FGMRES  C     compute convergence criterion for linear preconditioned FGMRES
194         JFNKgamma_lin = JFNKgamma_lin_max         JFNKgamma_lin = JFNKgamma_lin_max
195         IF ( newtonIter.GT.1.AND.newtonIter.LE.100         IF ( newtonIter.GT.1.AND.newtonIter.LE.SEAICE_JFNK_tolIter
196       &      .AND.JFNKresidual.LT.JFNKres_t ) THEN       &      .AND.JFNKresidual.LT.JFNKres_t ) THEN
197  C     Eisenstat, 1996, equ.(2.6)        C     Eisenstat and Walker (1996), eq.(2.6)
198          phi_e = 1. _d 0          JFNKgamma_lin = SEAICE_JFNKphi
199          alp_e = 1. _d 0       &       *( JFNKresidual/JFNKresidualKm1 )**SEAICE_JFNKalpha
         JFNKgamma_lin = phi_e*( JFNKresidual/JFNKresidualKm1 )**alp_e  
200          JFNKgamma_lin = min(JFNKgamma_lin_max, JFNKgamma_lin)          JFNKgamma_lin = min(JFNKgamma_lin_max, JFNKgamma_lin)
201          JFNKgamma_lin = max(JFNKgamma_lin_min, JFNKgamma_lin)          JFNKgamma_lin = max(JFNKgamma_lin_min, JFNKgamma_lin)
202         ENDIF         ENDIF
203  C     save the residual for the next iteration  C     save the residual for the next iteration
204         JFNKresidualKm1 = JFNKresidual         JFNKresidualKm1 = JFNKresidual
205  C  
206  C     The Krylov iteration using FGMRES, the preconditioner is LSOR  C     The Krylov iteration using FGMRES, the preconditioner is LSOR
207  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
208  C     down.  C     down.
# Line 189  C     krylovIter is mapped into "its" in Line 210  C     krylovIter is mapped into "its" in
210  C     in that routine  C     in that routine
211         krylovIter    = 0         krylovIter    = 0
212         iCode         = 0         iCode         = 0
213  C  
214         JFNKconverged = JFNKresidual.LT.JFNKtol         JFNKconverged = JFNKresidual.LT.JFNKtol
215  C  
216  C     do Krylov loop only if convergence is not reached  C     do Krylov loop only if convergence is not reached
217  C  
218         IF ( .NOT.JFNKconverged ) THEN         IF ( .NOT.JFNKconverged ) THEN
219  C  
220  C     start Krylov iteration (FGMRES)  C     start Krylov iteration (FGMRES)
221  C  
222          krylovConverged = .FALSE.          krylovConverged = .FALSE.
223          FGMRESeps = JFNKgamma_lin * JFNKresidual          FGMRESeps = JFNKgamma_lin * JFNKresidual
224          DO WHILE ( .NOT.krylovConverged )          DO WHILE ( .NOT.krylovConverged )
225  C     solution vector sol = du/vIce  C     solution vector sol = du/vIce
226  C     residual vector (rhs) Fu = u/vIceRes  C     residual vector (rhs) Fu = u/vIceRes
227  C     output work vectors wk1, -> input work vector wk2  C     output work vectors wk1, -> input work vector wk2
228  C      
229           CALL SEAICE_FGMRES_DRIVER(           CALL SEAICE_FGMRES_DRIVER(
230       I        uIceRes, vIceRes,       I        uIceRes, vIceRes,
231       U        duIce, dvIce, iCode,       U        duIce, dvIce, iCode,
232       I        FGMRESeps, iOutFGMRES,       I        FGMRESeps, iOutFGMRES,
233       I        newtonIter, krylovIter, myTime, myIter, myThid )       I        newtonIter, krylovIter, myTime, myIter, myThid )
# Line 214  C     FGMRES returns iCode either asking Line 235  C     FGMRES returns iCode either asking
235  C     or product of matrix (Jacobian) times vector. For iCode = 0, terminate  C     or product of matrix (Jacobian) times vector. For iCode = 0, terminate
236  C     iteration  C     iteration
237           IF (iCode.EQ.1) THEN           IF (iCode.EQ.1) THEN
238  C     Call preconditioner  C     Call preconditioner
239            IF ( SOLV_MAX_ITERS .GT. 0 )            IF ( SOLV_MAX_ITERS .GT. 0 )
240       &         CALL SEAICE_PRECONDITIONER(       &         CALL SEAICE_PRECONDITIONER(
241       U         duIce, dvIce,       U         duIce, dvIce,
242       I         zetaPre, etaPre, etaZpre, dwatPre,       I         zetaPre, etaPre, etaZpre, dwatPre,
243       I         newtonIter, krylovIter, myTime, myIter, myThid )       I         newtonIter, krylovIter, myTime, myIter, myThid )
244           ELSEIF (iCode.GE.2) THEN           ELSEIF (iCode.GE.2) THEN
245  C     Compute Jacobian times vector  C     Compute Jacobian times vector
246            CALL SEAICE_JACVEC(            CALL SEAICE_JACVEC(
247       I         uIce, vIce, uIceRes, vIceRes,       I         uIce, vIce, uIceRes, vIceRes,
248       U         duIce, dvIce,         U         duIce, dvIce,
249       I         newtonIter, krylovIter, myTime, myIter, myThid )       I         newtonIter, krylovIter, myTime, myIter, myThid )
250           ENDIF           ENDIF
251           krylovConverged = iCode.EQ.0           krylovConverged = iCode.EQ.0
# Line 234  C     End of Krylov iterate Line 255  C     End of Krylov iterate
255  C     some output diagnostics  C     some output diagnostics
256          IF ( debugLevel.GE.debLevA ) THEN          IF ( debugLevel.GE.debLevA ) THEN
257           _BEGIN_MASTER( myThid )           _BEGIN_MASTER( myThid )
258           totalNewtonItersLoc =           totalNewtonItersLoc =
259       &        SEAICEnewtonIterMax*(myIter-nIter0)+newtonIter       &        SEAICEnewtonIterMax*(myIter-nIter0)+newtonIter
260           WRITE(msgBuf,'(2A,2(1XI6),2E12.5)')           WRITE(msgBuf,'(2A,2(1XI6),2E12.5)')
261       &        ' S/R SEAICE_JFNK: Newton iterate / total, ',       &        ' S/R SEAICE_JFNK: Newton iterate / total, ',
262       &        'JFNKgamma_lin, initial norm = ',       &        'JFNKgamma_lin, initial norm = ',
263       &        newtonIter, totalNewtonItersLoc,       &        newtonIter, totalNewtonItersLoc,
# Line 244  C     some output diagnostics Line 265  C     some output diagnostics
265           CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,           CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
266       &        SQUEEZE_RIGHT, myThid )       &        SQUEEZE_RIGHT, myThid )
267           WRITE(msgBuf,'(3(A,I6))')           WRITE(msgBuf,'(3(A,I6))')
268       &        ' S/R SEAICE_JFNK: Newton iterate / total = ',newtonIter,       &        ' S/R SEAICE_JFNK: Newton iterate / total = ',newtonIter,
269       &        ' / ', totalNewtonItersLoc,       &        ' / ', totalNewtonItersLoc,
270       &        ', Nb. of FGMRES iterations = ', krylovIter       &        ', Nb. of FGMRES iterations = ', krylovIter
271           CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,           CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
# Line 267  C     Note that it should be possible to Line 288  C     Note that it should be possible to
288  C     at the beginning of the Newton iteration, thereby saving us from  C     at the beginning of the Newton iteration, thereby saving us from
289  C     the extra call of seaice_jfnk_update, but unfortunately that  C     the extra call of seaice_jfnk_update, but unfortunately that
290  C     changes the results, so we leave the stuff here for now.  C     changes the results, so we leave the stuff here for now.
291          CALL SEAICE_JFNK_UPDATE(          CALL SEAICE_JFNK_UPDATE(
292       I       duIce, dvIce,       I       duIce, dvIce,
293       U       uIce, vIce, JFNKresidual,       U       uIce, vIce, JFNKresidual,
294       O       uIceRes, vIceRes,       O       uIceRes, vIceRes,
295       I       newtonIter, myTime, myIter, myThid )       I       newtonIter, myTime, myIter, myThid )
296  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
297          DO bj=myByLo(myThid),myByHi(myThid)          DO bj=myByLo(myThid),myByHi(myThid)
298           DO bi=myBxLo(myThid),myBxHi(myThid)           DO bi=myBxLo(myThid),myBxHi(myThid)
299            DO J=1-Oly,sNy+Oly            DO J=1-OLy,sNy+OLy
300             DO I=1-Olx,sNx+Olx             DO I=1-OLx,sNx+OLx
301              duIce(I,J,bi,bj)= 0. _d 0              duIce(I,J,bi,bj)= 0. _d 0
302              dvIce(I,J,bi,bj)= 0. _d 0              dvIce(I,J,bi,bj)= 0. _d 0
303             ENDDO             ENDDO
# Line 286  C     reset du/vIce here instead of sett Line 307  C     reset du/vIce here instead of sett
307         ENDIF         ENDIF
308  C     end of Newton iterate  C     end of Newton iterate
309        ENDDO        ENDDO
310  C  
311  C--   Output diagnostics  C--   Output diagnostics
312  C  
313        IF ( SEAICE_monFreq .GT. 0. _d 0 ) THEN        IF ( SEAICE_monFreq .GT. 0. _d 0 ) THEN
314  C     Count iterations  C     Count iterations
315         totalJFNKtimeSteps = totalJFNKtimeSteps + 1         totalJFNKtimeSteps = totalJFNKtimeSteps + 1
# Line 297  C     Count iterations Line 318  C     Count iterations
318  C     Record failure  C     Record failure
319         totalKrylovFails   = totalKrylovFails + krylovFails         totalKrylovFails   = totalKrylovFails + krylovFails
320         IF ( newtonIter .EQ. SEAICEnewtonIterMax ) THEN         IF ( newtonIter .EQ. SEAICEnewtonIterMax ) THEN
321          totalNewtonFails = totalNewtonFails + 1          totalNewtonFails = totalNewtonFails + 1
322         ENDIF         ENDIF
323        ENDIF        ENDIF
324  C     Decide whether it is time to dump and reset the counter  C     Decide whether it is time to dump and reset the counter
325        writeNow = DIFFERENT_MULTIPLE(SEAICE_monFreq,        writeNow = DIFFERENT_MULTIPLE(SEAICE_monFreq,
326       &     myTime+deltaTClock, deltaTClock)       &     myTime+deltaTClock, deltaTClock)
327  #ifdef ALLOW_CAL  #ifdef ALLOW_CAL
328        IF ( useCAL ) THEN        IF ( useCAL ) THEN
329         CALL CAL_TIME2DUMP(         CALL CAL_TIME2DUMP(
330       I      zeroRL, SEAICE_monFreq,  deltaTClock,       I      zeroRL, SEAICE_monFreq,  deltaTClock,
331       U      writeNow,       U      writeNow,
332       I      myTime+deltaTclock, myIter+1, myThid )       I      myTime+deltaTclock, myIter+1, myThid )
# Line 313  C     Decide whether it is time to dump Line 334  C     Decide whether it is time to dump
334  #endif  #endif
335        IF ( writeNow ) THEN        IF ( writeNow ) THEN
336         _BEGIN_MASTER( myThid )         _BEGIN_MASTER( myThid )
337         WRITE(msgBuf,'(A)')         WRITE(msgBuf,'(A)')
338       &' // ======================================================='       &' // ======================================================='
339         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
340       &      SQUEEZE_RIGHT, myThid )       &      SQUEEZE_RIGHT, myThid )
341         WRITE(msgBuf,'(A)') ' // Begin JFNK statistics'         WRITE(msgBuf,'(A)') ' // Begin JFNK statistics'
342         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
343       &      SQUEEZE_RIGHT, myThid )       &      SQUEEZE_RIGHT, myThid )
344         WRITE(msgBuf,'(A)')         WRITE(msgBuf,'(A)')
345       &' // ======================================================='       &' // ======================================================='
346         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
347       &      SQUEEZE_RIGHT, myThid )       &      SQUEEZE_RIGHT, myThid )
348         WRITE(msgBuf,'(A,I10)')         WRITE(msgBuf,'(A,I10)')
349       &      ' %JFNK_MON: time step              = ', myIter+1       &      ' %JFNK_MON: time step              = ', myIter+1
350         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
351       &      SQUEEZE_RIGHT, myThid )       &      SQUEEZE_RIGHT, myThid )
352         WRITE(msgBuf,'(A,I10)')         WRITE(msgBuf,'(A,I10)')
353       &      ' %JFNK_MON: Nb. of time steps      = ', totalJFNKtimeSteps       &      ' %JFNK_MON: Nb. of time steps      = ', totalJFNKtimeSteps
354         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
355       &      SQUEEZE_RIGHT, myThid )       &      SQUEEZE_RIGHT, myThid )
356         WRITE(msgBuf,'(A,I10)')         WRITE(msgBuf,'(A,I10)')
357       &      ' %JFNK_MON: Nb. of Newton steps    = ', totalNewtonIters       &      ' %JFNK_MON: Nb. of Newton steps    = ', totalNewtonIters
358         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
359       &      SQUEEZE_RIGHT, myThid )       &      SQUEEZE_RIGHT, myThid )
360         WRITE(msgBuf,'(A,I10)')         WRITE(msgBuf,'(A,I10)')
361       &      ' %JFNK_MON: Nb. of Krylov steps    = ', totalKrylovIters       &      ' %JFNK_MON: Nb. of Krylov steps    = ', totalKrylovIters
362         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
363       &      SQUEEZE_RIGHT, myThid )       &      SQUEEZE_RIGHT, myThid )
364         WRITE(msgBuf,'(A,I10)')         WRITE(msgBuf,'(A,I10)')
365       &      ' %JFNK_MON: Nb. of Newton failures = ', totalNewtonFails       &      ' %JFNK_MON: Nb. of Newton failures = ', totalNewtonFails
366         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
367       &      SQUEEZE_RIGHT, myThid )       &      SQUEEZE_RIGHT, myThid )
368         WRITE(msgBuf,'(A,I10)')         WRITE(msgBuf,'(A,I10)')
369       &      ' %JFNK_MON: Nb. of Krylov failures = ', totalKrylovFails       &      ' %JFNK_MON: Nb. of Krylov failures = ', totalKrylovFails
370         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
371       &      SQUEEZE_RIGHT, myThid )       &      SQUEEZE_RIGHT, myThid )
372         WRITE(msgBuf,'(A)')         WRITE(msgBuf,'(A)')
373       &' // ======================================================='       &' // ======================================================='
374         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
375       &      SQUEEZE_RIGHT, myThid )       &      SQUEEZE_RIGHT, myThid )
376         WRITE(msgBuf,'(A)') ' // End JFNK statistics'         WRITE(msgBuf,'(A)') ' // End JFNK statistics'
377         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
378       &      SQUEEZE_RIGHT, myThid )       &      SQUEEZE_RIGHT, myThid )
379         WRITE(msgBuf,'(A)')         WRITE(msgBuf,'(A)')
380       &' // ======================================================='       &' // ======================================================='
381         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
382       &      SQUEEZE_RIGHT, myThid )       &      SQUEEZE_RIGHT, myThid )
# Line 372  C     Print more debugging information Line 393  C     Print more debugging information
393        IF ( debugLevel.GE.debLevA ) THEN        IF ( debugLevel.GE.debLevA ) THEN
394         IF ( newtonIter .EQ. SEAICEnewtonIterMax ) THEN         IF ( newtonIter .EQ. SEAICEnewtonIterMax ) THEN
395          _BEGIN_MASTER( myThid )          _BEGIN_MASTER( myThid )
396          WRITE(msgBuf,'(A,I10)')          WRITE(msgBuf,'(A,I10)')
397       &       ' S/R SEAICE_JFNK: JFNK did not converge in timestep ',       &       ' S/R SEAICE_JFNK: JFNK did not converge in timestep ',
398       &       myIter+1       &       myIter+1
399          CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,          CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
# Line 381  C     Print more debugging information Line 402  C     Print more debugging information
402         ENDIF         ENDIF
403         IF ( krylovFails .GT. 0 ) THEN         IF ( krylovFails .GT. 0 ) THEN
404          _BEGIN_MASTER( myThid )          _BEGIN_MASTER( myThid )
405          WRITE(msgBuf,'(A,I4,A,I10)')          WRITE(msgBuf,'(A,I4,A,I10)')
406       &       ' S/R SEAICE_JFNK: FGMRES did not converge ',       &       ' S/R SEAICE_JFNK: FGMRES did not converge ',
407       &       krylovFails, ' times in timestep ', myIter+1       &       krylovFails, ' times in timestep ', myIter+1
408          CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,          CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
# Line 389  C     Print more debugging information Line 410  C     Print more debugging information
410          _END_MASTER( myThid )          _END_MASTER( myThid )
411         ENDIF         ENDIF
412         _BEGIN_MASTER( myThid )         _BEGIN_MASTER( myThid )
413         WRITE(msgBuf,'(A,I6,A,I10)')         WRITE(msgBuf,'(A,I6,A,I10)')
414       &      ' S/R SEAICE_JFNK: Total number FGMRES iterations = ',       &      ' S/R SEAICE_JFNK: Total number FGMRES iterations = ',
415       &      totalKrylovItersLoc, ' in timestep ', myIter+1       &      totalKrylovItersLoc, ' in timestep ', myIter+1
416         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,         CALL PRINT_MESSAGE( msgBuf, standardMessageUnit,
# Line 405  CBOP Line 426  CBOP
426  C     !ROUTINE: SEAICE_JFNK_UPDATE  C     !ROUTINE: SEAICE_JFNK_UPDATE
427  C     !INTERFACE:  C     !INTERFACE:
428    
429        SUBROUTINE SEAICE_JFNK_UPDATE(        SUBROUTINE SEAICE_JFNK_UPDATE(
430       I     duIce, dvIce,       I     duIce, dvIce,
431       U     uIce, vIce, JFNKresidual,       U     uIce, vIce, JFNKresidual,
432       O     uIceRes, vIceRes,       O     uIceRes, vIceRes,
433       I     newtonIter, myTime, myIter, myThid )       I     newtonIter, myTime, myIter, myThid )
# Line 465  C     i,j,bi,bj :: loop indices Line 486  C     i,j,bi,bj :: loop indices
486        _RL     resLoc, facLS        _RL     resLoc, facLS
487        LOGICAL doLineSearch        LOGICAL doLineSearch
488  C     nVec    :: size of the input vector(s)  C     nVec    :: size of the input vector(s)
489  C     vector version of the residuals  C     resTmp  :: vector version of the residuals
490        INTEGER nVec        INTEGER nVec
491        PARAMETER ( nVec  = 2*sNx*sNy )        PARAMETER ( nVec  = 2*sNx*sNy )
492        _RL resTmp (nVec,1,nSx,nSy)        _RL resTmp (nVec,1,nSx,nSy)
493  C  
494        CHARACTER*(MAX_LEN_MBUF) msgBuf        CHARACTER*(MAX_LEN_MBUF) msgBuf
495  CEOP  CEOP
496    
# Line 479  C     Initialise some local variables Line 500  C     Initialise some local variables
500        facLS = 1. _d 0        facLS = 1. _d 0
501        doLineSearch = .TRUE.        doLineSearch = .TRUE.
502        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  
503  C     Create update  C     Create update
504         DO bj=myByLo(myThid),myByHi(myThid)         DO bj=myByLo(myThid),myByHi(myThid)
505          DO bi=myBxLo(myThid),myBxHi(myThid)          DO bi=myBxLo(myThid),myBxHi(myThid)
506           DO J=1-Oly,sNy+Oly           DO J=1-OLy,sNy+OLy
507            DO I=1-Olx,sNx+Olx            DO I=1-OLx,sNx+OLx
508             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)
509             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)
510            ENDDO            ENDDO
# Line 504  C     Create update Line 513  C     Create update
513         ENDDO         ENDDO
514  C     Compute current residual F(u), (includes re-computation of global  C     Compute current residual F(u), (includes re-computation of global
515  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)
516         CALL SEAICE_CALC_RESIDUAL(         CALL SEAICE_CALC_RESIDUAL(
517       I      uIce, vIce,       I      uIce, vIce,
518       O      uIceRes, vIceRes,       O      uIceRes, vIceRes,
519       I      newtonIter, 0, myTime, myIter, myThid )       I      newtonIter, 0, myTime, myIter, myThid )
520  C     Important: Compute the norm of the residual using the same scalar  C     Important: Compute the norm of the residual using the same scalar
521  C     product that SEAICE_FGMRES does  C     product that SEAICE_FGMRES does
522         CALL SEAICE_MAP2VEC(nVec,uIceRes,vIceRes,resTmp,.TRUE.,myThid)         CALL SEAICE_MAP2VEC(nVec,uIceRes,vIceRes,resTmp,.TRUE.,myThid)
523         CALL SEAICE_SCALPROD(nVec,1,1,1,resTmp,resTmp,resLoc,myThid)         CALL SEAICE_SCALPROD(nVec,1,1,1,resTmp,resTmp,resLoc,myThid)
524         resLoc = SQRT(resLoc)         resLoc = SQRT(resLoc)
525    C     Determine, if we need more iterations
526           doLineSearch = resLoc .GE. JFNKresidual
527    C     Limit the maximum number of iterations arbitrarily to four
528           doLineSearch = doLineSearch .AND. l .LT. 4
529    C     For the first iteration du/vIce = 0 and there will be no
530    C     improvement of the residual possible, so we do only the first
531    C     iteration
532           IF ( newtonIter .EQ. 1 ) doLineSearch = .FALSE.
533    C     Only start a linesearch after some Newton iterations
534           IF ( newtonIter .LE. SEAICE_JFNK_lsIter ) doLineSearch = .FALSE.
535    C     Increment counter
536           l = l + 1
537  C     some output diagnostics  C     some output diagnostics
538         IF ( debugLevel.GE.debLevA .AND. doLineSearch ) THEN         IF ( debugLevel.GE.debLevA .AND. doLineSearch ) THEN
539          _BEGIN_MASTER( myThid )          _BEGIN_MASTER( myThid )
540          WRITE(msgBuf,'(2A,2(1XI6),3E12.5)')          WRITE(msgBuf,'(2A,2(1XI6),3E12.5)')
541       &       ' S/R SEAICE_JFNK_UPDATE: Newton iter, LSiter, ',       &       ' S/R SEAICE_JFNK_UPDATE: Newton iter, LSiter, ',
542       &       'facLS, JFNKresidual, resLoc = ',       &       'facLS, JFNKresidual, resLoc = ',
543       &        newtonIter, l, facLS, JFNKresidual, resLoc       &        newtonIter, l, facLS, JFNKresidual, resLoc
# Line 532  C     iterations, 0.25*du/vIce in the se Line 553  C     iterations, 0.25*du/vIce in the se
553  C     This is the new residual  C     This is the new residual
554        JFNKresidual = resLoc        JFNKresidual = resLoc
555    
556  #endif /* SEAICE_ALLOW_DYNAMICS and SEAICE_CGRID and SEAICE_ALLOW_JFNK */  #endif /* SEAICE_ALLOW_JFNK */
557    
558        RETURN        RETURN
559        END        END
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