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        Hi,
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        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?
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</p><pre wrap="soft" style="font-family:SimSun;font-size:14px;overflow-wrap:break-word;">Here's part of my data file:</pre>
<pre wrap="soft" style="font-family:SimSun;font-size:14px;overflow-wrap:break-word;"># 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., <span style="font-family:SimSun;"> staggerTimeStep=.TRUE.,</span> <span style="font-family:SimSun;"> useCDscheme=.TRUE.,</span> <span style="font-family:SimSun;"> readBinaryPrec=64,</span> <span style="font-family:SimSun;"> tempAdvScheme=77,</span> <span style="font-family:SimSun;"> usePickupBeforeC54=.TRUE.,</span> <span style="font-family:SimSun;"> &</span> <span style="font-family:SimSun;"># Elliptic solver parameters</span> <span style="font-family:SimSun;"> &PARM02</span> <span style="font-family:SimSun;"> cg2dMaxIters=1000,</span> <span style="font-family:SimSun;">#cg2dTargetResidual=1.E-13,</span> <span style="font-family:SimSun;"> cg2dTargetResWunit=1.E-17,</span> <span style="font-family:SimSun;"> &</span></pre>
<pre wrap="soft" style="font-size:14px;overflow-wrap:break-word;"><span style="font-family:SimSun;">... </span></pre>
<pre wrap="soft" style="font-size:14px;overflow-wrap:break-word;"><span style="font-family:SimSun;">
<pre wrap="soft" style="font-size:14px;overflow-wrap:break-word;">Thanks in advance!</pre>
<pre wrap="soft" style="font-size:14px;overflow-wrap:break-word;">Yanhong</pre>
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