<div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr">Martin,</div><div dir="ltr"><br></div><div> Thanks much for the reply. I conduct idealized simulations around the Arctic regions. Thus, I need to work on curvilinear coordinates to resolve the singularity problem. I started with the grids on arctic40km and cs_4km. Generally, I got the numerical disturbances around the lateral boundary as the .png file. I tried to update thelateral boundary condition with Orlanski b.c. by adding obcs in packages.conf and useOBCS=.TRUE., in data.pkg, along with the data.obcs file. Hopefully the attached file in code, data.pkg, data.obcs, and data are clear enough. The input files include rhoRefFile, bathyFile, and hydrogThetaFile. The hydrogThetaFile is three dimensional so I don't want to attach it. Probably my update in b.c. was not successful because the temperature patterns are the same as the original one. Thus, I did not attach another .png file. I wonder how to update with the Orlanski b.c. in MITgcm?</div><div><br></div><div><p class="gmail-MsoPlainText" style="margin:0cm 0cm 0.0001pt;font-size:10.5pt"><font face="arial, helvetica, sans-serif"> I will study a planet other than the Earth. Hence, the grids of </font><span style="font-size:small">arctic40km and cs_4km will not be suitable for this work. I wonder the relations between radius and grids information on the curvilinear coordinates and what to start with?</span></p><p class="gmail-MsoPlainText" style="margin:0cm 0cm 0.0001pt;font-size:10.5pt"><font face="arial, helvetica, sans-serif"><br> Hopefully, my descriptions are clear enough and thanks much for your help,<br> </font></p><p class="gmail-MsoPlainText" style="margin:0cm 0cm 0.0001pt;font-size:10.5pt"><font face="arial, helvetica, sans-serif"> Yi-Chih</font></p></div><div dir="ltr"><font face="arial, helvetica, sans-serif"><br></font></div><div dir="ltr"><br></div><div dir="ltr">Date: Mon, 17 Dec 2018 10:49:50 +0100<br>From: Martin Losch <<a href="mailto:Martin.Losch@awi.de" target="_blank">Martin.Losch@awi.de</a>><br>To: MITgcm Support <<a href="mailto:mitgcm-support@mitgcm.org" target="_blank">mitgcm-support@mitgcm.org</a>><br>Subject: Re: [MITgcm-support] is Orlanski radiation condition working<br> in the rotating rank of MITgcm?<br>Message-ID: <<a href="mailto:30F990A0-C8E6-45D5-8C24-13EDF0112321@awi.de" target="_blank">30F990A0-C8E6-45D5-8C24-13EDF0112321@awi.de</a>><br>Content-Type: text/plain; charset="utf-8"<br><br>Yi-Chih,<br><br>I am sorry. I don?t understand what you are doing (and why, but that?s maybe not so important).<br><br>Does you config have anything to do with verification/rotating_tank?<br>This experiment mimics a small tank on a turntable in a lab. It?s not clear to me how to upscale that to the Arctic without fundamentally changing the parameters of the model. <br>Thus, I cannot follow your conclusions that you can fix anything with open boundaries. You need to make sure that your flow parameters are set correctly (eg. horizonal and vertical viscosity, Coriolis parameter, etc ?.)<br><br>Using the grid data from arctic40km or cs_4km confuses me even more in this context. If you do things like this, the coriolis parameter should be automatically set according to the latitudes in the domain. You cannot change the radius of the earth without adjusting the grid information (because grid spacing ~ radius of the earth).<br><br>I don?t think anyone can help you with this unless you are clearer about you configuration. Maybe it would be a good idea to <br>(1) post your configuration somewhere, namelist files, ?code? directory, ?input files" (please no large files on this list)<br>(2) post a plot of the ?disturbances? that you observe, with and without orlanski obcs<br><br>Martin<br></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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