<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">You need to find out why it is becoming unstable. Have a look at the solution and see if you can see where and why it is blowing up.<div class=""><br class=""></div><div class="">Matt</div><div class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Sep 18, 2022, at 6:08 AM, Sabri MUTLU (MAM-ÇTÜE) <<a href="mailto:sabri.mutlu@tubitak.gov.tr" class="">sabri.mutlu@tubitak.gov.tr</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class=""><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt;" class=""><div class=""><span style="font-size: 12pt;" class="">Hi all,</span><br class=""></div><div data-marker="__QUOTED_TEXT__" class=""><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt;" class=""><br class=""><div class="">As a newbie in this field, I need help for the following problem, which I have been trying to deal with for a long time.</div><br class=""><div class="">I built a regional model for my thesis study. When I try to run it for 12 or more days, it gives "NaN" values after 8 or 9 days later in the model. </div><div class="">Could you please examine the following model configuration and give me an idea for possible solution?</div><br class=""><div class="">(I had to choose Orlanski method since don't have any boundary condition to feed the model.)</div><br class=""><div class="">Thank you in advance.</div><div class="">Sabri</div><br class=""><div class=""><div class=""> &PARM01</div><div class=""> viscAh=2.E-2,</div><div class=""> viscAz=1.5E-5,</div><div class=""> no_slip_sides=.TRUE.,</div><div class=""> no_slip_bottom=.TRUE.,</div><div class=""> diffKhT=2.E-2,</div><div class=""> diffKhS=2.E-2,</div><div class=""> diffKzT=2.E-5,</div><div class=""> diffKzS=2.E-5,</div><div class=""> f0=0.948E-4,</div><div class=""> implicitFreeSurface=.TRUE.,</div><div class=""> exactConserv=.TRUE.,</div><div class=""> implicitDiffusion=.TRUE.,</div><div class=""> implicitViscosity=.TRUE.,</div><div class=""> eosType = 'JMD95Z',</div><div class=""> tRef=22.2803,22.3383,22.3646,22.4220,22.5469,22.5081,21.0406,19.6075,18.3619,16.7902,15.8310,15.4016,15.3625,15.3935,15.4334,15.4465,15.4508,15.4710,15.5226,</div><div class="">      15.5428,15.5485,15.5589,15.5829,15.5860,15.5859,15.5767,15.5572,15.5477,15.5357,15.5068,15.4782,15.4640,15.4337,15.3816,15.3480,15.2998,15.2423,15.2127,</div><div class="">      15.1271,15.0639,15.0086,14.9722,14.9229,14.8937,14.8470,14.8073,14.7838,14.7677,14.7392,14.7210,14.7037,14.7036,14.7035,14.7034,14.7033,</div><div class=""> sRef=24.3775,24.4042,24.4730,24.5782,24.7042,24.8407,25.8279,26.4026,28.0163,30.1542,31.7531,33.9951,37.0132,37.5629,37.8303,37.9592,38.0011,38.1433,38.2744,</div><div class="">      38.3184,38.3548,38.4269,38.5535,38.6043,38.6738,38.7411,38.7479,38.7496,38.7510,38.7512,38.7469,38.7529,38.7569,38.7644,38.7666,38.7683,38.7698,38.7696,</div><div class="">      38.7635,38.7563,38.7513,38.7476,38.7427,38.7399,38.7354,38.7326,38.7305,38.7280,38.7254,38.7236,38.7220,38.7220,38.7220,38.7220,38.7220,</div><div class=""> staggerTimeStep = .TRUE.,</div><div class=""> tempAdvScheme = 33,</div><div class=""> saltAdvScheme = 33,</div><div class=""> useSingleCpuIO=.TRUE.,</div><div class=""> bottomDragQuadratic = 0.02,</div><div class=""> select_rStar = 0,</div><div class=""> &</div><br class=""><div class=""> &PARM02</div><div class=""> cg2dMaxIters=300,</div><div class=""> cg2dTargetResidual=1.E-13,</div><div class=""> cg3dMaxIters=20,</div><div class=""> cg3dTargetResidual=1.E-8,</div><div class=""> &</div><div class="">---------</div><div class=""><div class=""> &PARM03</div><div class=""> startTime  = 0.,</div><div class=""> endTime = 1036800.,</div><div class=""> deltaT=5,</div><div class=""> dumpFreq=10800.,</div><div class=""> monitorFreq=3600.,</div><div class=""> monitorSelect=2,</div><div class=""> periodicExternalForcing=.TRUE.,</div><div class=""> externForcingPeriod=10800.,</div><div class=""> externForcingCycle=1036800.,</div><div class=""> &</div><br class=""><div class=""> &PARM04</div><div class=""> usingSphericalPolarGrid=.TRUE.,</div><div class=""> delz = 32*2,22*8,10,</div></div></div><div class=""><div class=""> delX = 528*0.0013,</div><div class=""> delY = 164*0.001,</div><div class=""> ygOrigin=40.656,</div><div class=""> xgOrigin=29.2612,</div><div class=""> &</div><br class=""><div class=""> &PARM05</div><div class=""> bathyFile='bathy_v6_528-164.bin',</div><div class=""> zonalWindFile='windU_2309-0510.bin',</div><div class=""> meridWindFile='windV_2309-0510.bin',</div><div class=""> &</div><br class=""><div class=""><div class=""># Open-boundaries</div><div class=""> &OBCS_PARM01</div><div class=""> OB_Iwest=164*1,</div><div class=""> useOrlanskiWest=.TRUE.,</div><div class=""> useOBCSbalance=.TRUE.,</div><div class=""> useOBCSsponge=.FALSE.,</div><div class=""> OBCS_balanceFacW = -1.,</div><div class=""> &</div><br class=""></div></div><div class=""><div class=""># Packages</div><div class=""> &PACKAGES</div><div class=""> useOBCS=.TRUE.,</div><div class=""> useKPP =.TRUE.,</div><div class=""> &</div></div></div><br class=""></div></div></div>_______________________________________________<br class="">MITgcm-support mailing list<br class=""><a href="mailto:MITgcm-support@mitgcm.org" class="">MITgcm-support@mitgcm.org</a><br class="">https://urldefense.com/v3/__http://mailman.mitgcm.org/mailman/listinfo/mitgcm-support__;!!Mih3wA!FESXL3f13-HEtS0Gpg-VY86MgAy-PM4Ai4Q1CWC9SWho-hAR-5s2KHK44htyZaLDvWLlzjo3dQZ2mwDVIV5cfG84t0U2dw$  <br class=""></div></blockquote></div><br class=""></div></body></html>