[MITgcm-support] Does the value of the parameter "viscAh" have a limit? (ideal_2D_oce)

[赖燕红]

Hi,

When I tried to change the parameter "viscAh" from 12E5(its default value) to 12E6 when usind ideal_2D_oce case, for some reason the simulation proceeds extremely slowly, like it only simulates 5000 years after integrated for 48 hours, but normally it only needs a few hours to complete 10 thousand years simulation if we don't change "viscAh" to 12E6, do you know why or does the value of "viscAh" have a limit?

Here's part of my data file:
# Continuous equation parameters
 &PARM01
 tRef= 18.8, 16.3, 13.1, 10.4, 8.1, 6.0, 4.5,
      3.4, 2.7, 2.2, 1.8, 1.5, 1.2, 1.0, 0.9,
 sRef= 15*34.7,
 cosPower=1.,
 viscAr=1.E-3,
 viscAh=12.E6,
 no_slip_sides=.FALSE.,
 no_slip_bottom=.TRUE.,
 bottomDragLinear=1.E-3,
#diffK4T=2.E12,
 diffKhT=0.E3,
 diffKrNrT=1.E-4, 14*1.E-5,
 ivdc_kappa=100.,
 implicitDiffusion=.TRUE.,
 eosType='LINEAR',
 tAlpha=2.E-4,
 sBeta =0.E-4,
 saltStepping=.FALSE.,
 gravity=9.81,
 rhonil=1035.,
 implicitFreeSurface=.TRUE.,
 exactConserv=.TRUE.,  staggerTimeStep=.TRUE., useCDscheme=.TRUE., readBinaryPrec=64, tempAdvScheme=77, usePickupBeforeC54=.TRUE., &# Elliptic solver parameters &PARM02 cg2dMaxIters=1000,#cg2dTargetResidual=1.E-13, cg2dTargetResWunit=1.E-17, &
... 
Thanks in advance!
Yanhong

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