/[MITgcm]/MITgcm/model/inc/PARAMS.h
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revision 1.6 by adcroft, Wed May 20 21:29:31 1998 UTC revision 1.7 by cnh, Thu May 21 18:28:50 1998 UTC
# Line 10  C     | the parameters can also be found Line 10  C     | the parameters can also be found
10  C     \==========================================================/  C     \==========================================================/
11    
12  C--   Contants  C--   Contants
 C     nOBands - No. of offline data time bands  
       INTEGER nOBands  
       PARAMETER ( nOBands = 12 )  
13  C     Useful physical values  C     Useful physical values
14        Real*8 PI        Real*8 PI
15        PARAMETER ( PI    = 3.14159265358979323844D0   )        PARAMETER ( PI    = 3.14159265358979323844D0   )
16        Real*8 deg2rad        Real*8 deg2rad
17        PARAMETER ( deg2rad = 2.D0*PI/360.D0           )        PARAMETER ( deg2rad = 2.D0*PI/360.D0           )
18    
19    C     Symbolic values
20    C     precXXXX - Used to indicate what precision to use for
21    C                dumping model state.
22          INTEGER precFloat32
23          PARAMETER ( precFloat32 = 0 )
24          INTEGER precFloat64
25          PARAMETER ( precFloat64 = 1 )
26    
27    C     Checkpoint data
28          INTEGER maxNoChkptLev
29          PARAMETER ( maxNoChkptLev = 2 )
30    
31  C--   COMMON /PARM_C/ Character valued parameters used by the model.  C--   COMMON /PARM_C/ Character valued parameters used by the model.
32  C     oBandId  - Offline dataset identifiers for different periods.  C     checkPtSuff - List of checkpoint file suffices
33        COMMON /PARM_C/ oBandId        COMMON /PARM_C/ checkPtSuff
34        CHARACTER*3 oBandId(nOBands)        CHARACTER*(5) checkPtSuff(maxNoChkptLev)
35    
36  C--   COMMON /PARM_I/ Integer valued parameters used by the model.  C--   COMMON /PARM_I/ Integer valued parameters used by the model.
37  C     cg2dMaxIters        - Maximum number of iterations in the  C     cg2dMaxIters        - Maximum number of iterations in the
38  C                           two-dimensional con. grad solver.  C                           two-dimensional con. grad solver.
# Line 32  C     nIter0              - Start time-s Line 42  C     nIter0              - Start time-s
42  C     nTimeSteps          - Number of timesteps to execute  C     nTimeSteps          - Number of timesteps to execute
43  C     numStepsPerPickup   - For offline setup. Frequency of pickup  C     numStepsPerPickup   - For offline setup. Frequency of pickup
44  C                           of flow fields.  C                           of flow fields.
45    C     writeStatePrec      - Precision used for writing model state.
46    C     writeBinaryPrec     - Precision used for writing binary files
47    C     readBinaryPrec      - Precision used for reading binary files
48    C     nCheckLev           - Holds current checkpoint level
49        COMMON /PARM_I/        COMMON /PARM_I/
50       &        cg2dMaxIters,       &        cg2dMaxIters,
51       &        cg2dChkResFreq,       &        cg2dChkResFreq,
52       &        nIter0, nTimeSteps,       &        nIter0, nTimeSteps,
53       &        numStepsPerPickup       &        numStepsPerPickup,
54         &        writeStatePrec, nCheckLev,
55         &        writeBinaryPrec, readBinaryPrec
56        INTEGER cg2dMaxIters        INTEGER cg2dMaxIters
57        INTEGER cg2dChkResFreq        INTEGER cg2dChkResFreq
58        INTEGER nIter0        INTEGER nIter0
59        INTEGER nTimeSteps        INTEGER nTimeSteps
60        INTEGER numStepsPerPickup        INTEGER numStepsPerPickup
61          INTEGER writeStatePrec
62          INTEGER writeBinaryPrec
63          INTEGER readBinaryPrec
64          INTEGER nCheckLev
65    
66  C--   COMMON /PARM_L/ Logical valued parameters used by the model.  C--   COMMON /PARM_L/ Logical valued parameters used by the model.
67  C     usingCartesianGrid - If TRUE grid generation will be in a cartesian  C     usingCartesianGrid - If TRUE grid generation will be in a cartesian
# Line 85  C                     and off. Line 105  C                     and off.
105  C--   COMMON /PARM_R/ "Real" valued parameters used by the model.  C--   COMMON /PARM_R/ "Real" valued parameters used by the model.
106  C     cg2dTargetResidual  C     cg2dTargetResidual
107  C               - Target residual for cg2d solver.  C               - Target residual for cg2d solver.
108    C     cg2dpcOffDFac - Averaging weight for preconditioner off-diagonal.
109    C     Note. 20th May 1998
110    C           I made a weird discovery! In the model paper we argue
111    C           for the form of the preconditioner used here ( see
112    C           A Finite-volume, Incompressible Navier-Stokes Model
113    C           ...., Marshall et. al ). The algebra gives a simple
114    C           0.5 factor for the averaging of ac and aCw to get a
115    C           symmettric pre-conditioner. By using a factor of 0.51
116    C           i.e. scaling the off-diagonal terms in the
117    C           preconditioner down slightly I managed to get the
118    C           number of iterations for convergence in a test case to
119    C           drop form 192 -> 134! Need to investigate this further!
120    C           For now I have introduced a parameter cg2dpcOffDFac which
121    C           defaults to 0.51 but can be set at runtime.
122  C     delZ      - Vertical grid spacing ( m ) - delZ is the distance  C     delZ      - Vertical grid spacing ( m ) - delZ is the distance
123  C                 between "w" surfaces.  C                 between "w" surfaces.
124  C     delX      - Separation between cell faces (m) or (deg), depending  C     delX      - Separation between cell faces (m) or (deg), depending
# Line 119  C                 salt vertically ( m^2/ Line 153  C                 salt vertically ( m^2/
153  C     diffK4S   - Biharmonic diffusion coeff. for mixing of  C     diffK4S   - Biharmonic diffusion coeff. for mixing of
154  C                 salt laterally ( m^4/s )  C                 salt laterally ( m^4/s )
155  C     deltaT    - Default timestep ( s )  C     deltaT    - Default timestep ( s )
156    C     deltaTClock  - Timestep used as model "clock". This determines the
157    C                    IO frequencies and is used in tagging output. It can
158    C                    be totally different to the dynamical time. Typically
159    C                    it will be the deep-water timestep for accelerated runs.
160    C                    Frequency of checkpointing and dumping of the model state
161    C                    are referenced to this clock. ( s )
162  C     deltaTMom    - Timestep for momemtum equations ( s )  C     deltaTMom    - Timestep for momemtum equations ( s )
163  C     deltaTtracer - Timestep for tracer equations ( s )  C     deltaTtracer - Timestep for tracer equations ( s )
164  C     tauCD     - CD scheme coupling timescale ( 1/s )  C     tauCD     - CD scheme coupling timescale ( 1/s )
# Line 130  C     GMdepth   - Depth over which to in Line 170  C     GMdepth   - Depth over which to in
170  C     GMbackground - background value of GM/Redi coefficient  C     GMbackground - background value of GM/Redi coefficient
171  C     startTime - Starting time for this integration ( s ).  C     startTime - Starting time for this integration ( s ).
172  C     endTime   - Ending time for this integration ( s ).  C     endTime   - Ending time for this integration ( s ).
173  C     chkPtFreq - Frequency of check pointing ( s ).  C     chkPtFreq  - Frequency of rolling check pointing ( s ).
174    C     pChkPtFreq - Frequency of permanent check pointing ( s ).
175  C     dumpFreq  - Frequency with which model state is written to  C     dumpFreq  - Frequency with which model state is written to
176  C                 post-processing files ( s ).  C                 post-processing files ( s ).
177        COMMON /PARM_R/ cg2dTargetResidual, delZ, delX, delY, deltaT,        COMMON /PARM_R/ cg2dTargetResidual, cg2dpcOffDFac, delZ, delX, delY,
178       & deltaTmom, deltaTtracer, abeps, startTime, phiMin, thetaMin,       & deltaT,deltaTmom, deltaTtracer, deltaTClock,abeps, startTime, phiMin,
179       & rSphere, f0, fCori, beta, viscAh, viscAz, viscA4, diffKhT, diffKzT,       & thetaMin, rSphere, f0, fCori, beta, viscAh, viscAz, viscA4,
180       & diffK4T, diffKhS, diffKzS, diffK4S, delT, tauCD, rCD,       & diffKhT, diffKzT, diffK4T, diffKhS, diffKzS, diffK4S, delT,
181         & tauCD, rCD,
182       & GMmaxslope,GMlength,GMalpha,GMdepth,GMkbackground,       & GMmaxslope,GMlength,GMalpha,GMdepth,GMkbackground,
183       & gravity, rhonil, tRef, sRef,       & gravity, rhonil, tRef, sRef,
184       & endTime, chkPtFreq, dumpFreq       & endTime, chkPtFreq, pchkPtFreq, dumpFreq
185        _RL cg2dTargetResidual        _RL cg2dTargetResidual
186          _RL cg2dpcOffDFac
187        _RL delZ(Nz)        _RL delZ(Nz)
188        _RL delX(Nx)        _RL delX(Nx)
189        _RL delY(Ny)        _RL delY(Ny)
190        _RL deltaT        _RL deltaT
191          _RL deltaTClock
192        _RL deltaTmom        _RL deltaTmom
193        _RL deltaTtracer        _RL deltaTtracer
194        _RL abeps        _RL abeps
# Line 178  C                 post-processing files Line 222  C                 post-processing files
222        _RL startTime        _RL startTime
223        _RL endTime        _RL endTime
224        _RL chkPtFreq        _RL chkPtFreq
225          _RL pChkPtFreq
226        _RL dumpFreq        _RL dumpFreq
227    
228        COMMON /PARM_A/ HeatCapacity_Cp,        COMMON /PARM_A/ HeatCapacity_Cp,
# Line 194  C     sBeta     - Linear EOS haline cont Line 239  C     sBeta     - Linear EOS haline cont
239        COMMON /PARM_EOS_LIN/ tAlpha,sBeta        COMMON /PARM_EOS_LIN/ tAlpha,sBeta
240        _RL tAlpha        _RL tAlpha
241        _RL sBeta        _RL sBeta
242    
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