[MITgcm-support] Fwd: model time step 'deltaTmom'
Madhu
madhu.iitd at gmail.com
Thu Jul 12 01:44:37 EDT 2012
Hello MITGCM Users
I am using curvilinear grid to rum the MITGCM model. Total number of grid
points are 175x200x15. The horizontal grid resolution dx: 3- 5km and dy:
4 -6 km. The model is running with time step 1sec, which is too small
'deltaTmom = 1.' (for more details following is the data file used for
model run).
The issue is, I want to increase the model time step so that the
simulations can be done faster.
#**********data***********
# ====================
# | Model parameters |
# ====================
#
# Continuous equation parameters
&PARM01
# viscAhGrid = 0.0
viscAh=5.E2,
viscAz=5.E-3,
diffKzT=1.E-4,
diffKzS=1.E-4,
# diffKhT=0,
# diffKhS=0,
no_slip_sides=.TRUE.,
no_slip_bottom=.TRUE.,
tempAdvScheme=33,
saltAdvScheme=33,
staggerTimeStep=.TRUE.,
eosType='LINEAR',
tAlpha=2.E-4,
sBeta =2.E-6,
gravity=9.81,
f0=0.000001365,
beta=1.E-11,
hFacMin=1.,
readBinaryPrec=64,
writeBinaryPrec=64,
nonHydrostatic=.FALSE.,
rigidLid=.FALSE.,
implicitFreeSurface=.TRUE.,
exactConserv=.TRUE.,
useSingleCpuIO=.TRUE.
globalFiles=.FALSE.,
&
# Elliptic solver parameters
&PARM02
cg2dMaxIters=200,
cg2dTargetResidual=1.E-13,
# cg3dMaxIters=100,
# cg3dTargetResidual=1.E-13,
&
# Time stepping parameters
&PARM03
startTime=0.,
endTime=43200.,
deltaTmom = 1.
pChkptFreq=0.,
dumpFreq=21600.,
monitorFreq=21600.,
&
# Gridding parameters
&PARM04
usingCurvilinearGrid=.TRUE.,
delZ= 5.0 , 10.0 , 20.0, 30.0, 40.0 ,
50.0 , 60.0 , 70.0, 80.0, 90.0,
100.0 ,200.0 ,300.0 ,400.0,500.0,
rSphere=6370.E3,
&
# Input datasets
&PARM05
bathyFile='TOPO.bin',
zonalWindFile='Ustr.bin',
meridWindFile='Vstr.bin',
hydrogThetaFile='T15lev.bin',
hydrogSaltFile='S15lev.bin',
checkIniTemp=.false.,
checkIniSalt=.false.,
&
The issue is, I want to increase the model time step so that the
simulations can be done faster.
How to increase the model time step?
If I am increasing 'deltaTmom' >1 model outputs..... NaN.
the files 'packeges.conf' , 'CPP_OPTIONS.h' and 'data.exf' along with the
screan output dump file 'exp1' are atteched.
Waiting for reply.
Madhu
--
Madhu
--
Madhu
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