<div dir="ltr"><div>Hi all,<br></div><div>I am running a North Atlantic box with thermal forcing only, at 80km resolution with LLC4320 numerics. I can't understand why I have numerical noise even though CFL < 0.02</div><div>Details of the configuration are below.<br></div><div>Thanks for your help,<br></div><div>Antoine<br></div><div><br></div><div> LLC4320 numerics:</div><div><a href="http://wwwcvs.mitgcm.org/viewvc/MITgcm/MITgcm_contrib/llc_hires/llc_4320/input/" target="_blank">http://wwwcvs.mitgcm.org/viewvc/MITgcm/MITgcm_contrib/llc_hires/llc_4320/input/</a></div><div><a href="http://wwwcvs.mitgcm.org/viewvc/MITgcm/MITgcm_contrib/llc_hires/llc_4320/code/" target="_blank">http://wwwcvs.mitgcm.org/viewvc/MITgcm/MITgcm_contrib/llc_hires/llc_4320/code/</a></div><div>except for <br></div><div># rhoConstFresh=999.8,</div><div># viscC4Leith=2.15,</div><div># viscC4Leithd=2.15,</div><div># viscA4GridMax=0.8,</div><div># useAreaViscLength=.TRUE.,</div><div># debuglevel=-1,</div><div># convertFW2Salt=-1.,</div><div># useRealFreshWaterFlux=.TRUE.,</div><div># globalFiles=.TRUE.,</div><div># writeBinaryPrec=32,</div><div># temp_EvPrRn=0.,</div><div># implicSurfPress = 0.6,</div><div># implicDiv2DFlow = 0.6,</div><div># bottomDragQuadratic = 0.0021,</div><div>and no KPP and instead:</div><div>bottomDragLinear =3.E-4,</div><div>viscAz=1.E-3,</div><div>viscAh=1.E3,</div><div>diffKhT=7.E2,</div><div>diffKzT=1.E-4,</div><div> ivdc_kappa=100.,</div><div>cg2dMaxIters=1000,</div><div>cg2dTargetResidual=1.E-13,</div><div><br></div><div><br></div><div><span class="gmail-im"></span></div><div><br></div><div> <br></div><div><span class="gmail-im"></span></div></div>