<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">So when you look at<div class="">grep cfl_W STDOUT.0000</div><div class="">the numbers are small (e.g. <= 0.1)</div><div class="">Because this looks like grid scale noise to me. </div><div class=""><br class=""></div><div class="">It does have some interesting structure. Does it grow with time or stay stable?</div><div class="">If it is growing with time it may just be chaos</div><div class="">If it is not growing in time it is likely numerical noise, and you need to damp it somehow (e.g. increase visc and/or diff, or perhaps change numerics in some way)</div><div class=""><br class=""></div><div class="">Matt</div><div class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Sep 3, 2021, at 2:00 PM, Peng Zhan <<a href="mailto:peng.zhan@kaust.edu.sa" class="">peng.zhan@kaust.edu.sa</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><div class="gmail_default" style="font-family:trebuchet ms,sans-serif">Hi Matt,</div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif"><br class=""></div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif">Thanks for the suggestions.</div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif">The problem still persists even with a very small time step and a long <span style="font-family:Arial,Helvetica,sans-serif" class="">restoring timescale.</span></div><div class="gmail_default" style="font-family:trebuchet ms,sans-serif"><span style="font-family:Arial,Helvetica,sans-serif" class=""><br class=""></span></div><div class="gmail_default">It is so weird that those noises in the rbcs run appear when the relaxMaskFile has non-zero values wherever placed in the wet points.</div><div class="gmail_default">I was wondering if anyone has experienced similar problems before?</div><div class="gmail_default"><br class=""></div><div class="gmail_default">Thanks, Peng</div><div class="gmail_default"><br class=""></div></div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Sep 3, 2021 at 12:12 AM Matthew Mazloff <<a href="mailto:mmazloff@ucsd.edu" target="_blank" class="">mmazloff@ucsd.edu</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="">What is your cfl? You may need to reduce your timestep. <div class="">If you prefer not reducing your timestep you could likely increase your diffusivity or viscosity. </div><div class=""><div class=""><br class=""></div><div class="">(Another possibility is that your restoring timescale is too short, but this seems to be showing up even outside the box.)</div><div class=""> </div><div class="">Matt</div><div class=""><br class=""></div><div class=""><br class=""><div class=""><br class=""><blockquote type="cite" class=""><div class="">On Sep 2, 2021, at 1:54 PM, Peng Zhan <<a href="mailto:peng.zhan@kaust.edu.sa" target="_blank" class="">peng.zhan@kaust.edu.sa</a>> wrote:</div><br class=""><div class=""><div dir="ltr" class=""><div class="gmail_default" style="font-family:"trebuchet ms",sans-serif">Hi all,</div><div class="gmail_default" style="font-family:"trebuchet ms",sans-serif"><br class=""></div><div class="gmail_default" style="font-family:"trebuchet ms",sans-serif">I am running an experiment with rbcs for temperature.</div><div class="gmail_default" style="font-family:"trebuchet ms",sans-serif"><br class=""></div><div class="gmail_default" style="font-family:"trebuchet ms",sans-serif">As shown in the following figure a snapshot of the difference between the rbcs run and the free run, while the region to be relaxed can be specified by the relaxMaskFile (roughly the box area), some unexpected noise appears randomly across the domain. </div><div class="gmail_default" style="font-family:"trebuchet ms",sans-serif"><br class=""></div><div class="gmail_default" style="font-family:"trebuchet ms",sans-serif">Any hint to get out of it is highly appreciated!</div><div class="gmail_default" style="font-family:"trebuchet ms",sans-serif">Thanks in advance, Peng</div><span id="gmail-m_-4993157441166108234gmail-m_6306189823816761347gmail-m_9023525307826656803cid:ii_kt3elcbu1" class=""><Screen Shot 2021-09-02 at 11.51.13 PM.png></span><br class=""></div>
<br class="">
<div class=""><hr class=""></div><font face="Arial" size="1" class="">This message and its contents, including attachments are intended solely for the original recipient. If you are not the intended recipient or have received this message in error, please notify me immediately and delete this message from your computer system. Any unauthorized use or distribution is prohibited. Please consider the environment before printing this email.</font>_______________________________________________<br class="">MITgcm-support mailing list<br class=""><a href="mailto:MITgcm-support@mitgcm.org" target="_blank" class="">MITgcm-support@mitgcm.org</a><br class=""><a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__mailman.mitgcm.org_mailman_listinfo_mitgcm-2Dsupport&d=DwICAg&c=-35OiAkTchMrZOngvJPOeA&r=HSHS34ROdfL7f2oVxuKB761hrMvWN1RWA5k3SHGts_s&m=NAU_-idm9JygX7wogiZYnJeDD1wrbJzz-4jC07j4F4c&s=o7wQbUVObU6gtbki11ZV8aVUJts_zjvGRwrMIDQi1ZU&e=" target="_blank" class="">https://urldefense.proofpoint.com/v2/url?u=http-3A__mailman.mitgcm.org_mailman_listinfo_mitgcm-2Dsupport&d=DwICAg&c=-35OiAkTchMrZOngvJPOeA&r=HSHS34ROdfL7f2oVxuKB761hrMvWN1RWA5k3SHGts_s&m=NAU_-idm9JygX7wogiZYnJeDD1wrbJzz-4jC07j4F4c&s=o7wQbUVObU6gtbki11ZV8aVUJts_zjvGRwrMIDQi1ZU&e=</a> <br class=""></div></blockquote></div><br class=""></div></div></div>_______________________________________________<br class="">
MITgcm-support mailing list<br class="">
<a href="mailto:MITgcm-support@mitgcm.org" target="_blank" class="">MITgcm-support@mitgcm.org</a><br class="">
<a href="https://urldefense.com/v3/__http://mailman.mitgcm.org/mailman/listinfo/mitgcm-support__;!!Nmw4Hv0!iV50jiicaR1W8R-AIYenIjN_lJJ-suqA5G6oaPWZlk6MrQJTZpYFnjVHy9iD6bPRpzi7$" rel="noreferrer" target="_blank" class="">https://urldefense.com/v3/__http://mailman.mitgcm.org/mailman/listinfo/mitgcm-support__;!!Nmw4Hv0!iV50jiicaR1W8R-AIYenIjN_lJJ-suqA5G6oaPWZlk6MrQJTZpYFnjVHy9iD6bPRpzi7$</a> <br class="">
</blockquote></div><br clear="all" class=""><div class=""><br class=""></div>-- <br class=""><div dir="ltr" class=""><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><div dir="ltr" class=""><div dir="ltr" class=""><p class=""><span style="font-family:"trebuchet ms",sans-serif" class="">______________________________</span><br class=""></p><div dir="ltr" class=""><font face="tahoma, sans-serif" class="">Dr. Peng Zhan</font></div><div class=""><font face="tahoma, sans-serif" class="">Research Scientist</font></div><div class=""><span style="color:rgb(42,48,54);font-family:tahoma,sans-serif" class="">Physical Science and Engineering Division (PSE)</span></div><div dir="ltr" class=""><font face="tahoma, sans-serif" class="">King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia</font></div><div dir="ltr" class=""></div><div dir="ltr" class=""><font face="tahoma, sans-serif" class="">Mobile: +966 544701621</font><br class=""><b class=""><span style="color:rgb(148,54,52);font-size:10pt" class=""><a href="mailto:peng.zhan@kaust.edu.sa" target="_blank" class=""><span style="color:blue" class=""></span></a></span></b></div><div dir="ltr" class=""><b class=""><span style="color:rgb(148,54,52);font-size:10pt" class=""></span></b> <br class=""></div></div></div></div></div></div></div>
<br class="">
<div class=""><hr class=""></div><font face="Arial" size="1" class="">This message and its contents, including attachments are intended solely for the original recipient. If you are not the intended recipient or have received this message in error, please notify me immediately and delete this message from your computer system. Any unauthorized use or distribution is prohibited. Please consider the environment before printing this email.</font>_______________________________________________<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.proofpoint.com/v2/url?u=http-3A__mailman.mitgcm.org_mailman_listinfo_mitgcm-2Dsupport&d=DwICAg&c=-35OiAkTchMrZOngvJPOeA&r=HSHS34ROdfL7f2oVxuKB761hrMvWN1RWA5k3SHGts_s&m=M7n307B4HPzSAuVW8lL8fjhISF7ywU5GRvQPyjtqjUM&s=-RlNPBw-rNo_YmJp-I212-OJ3HKgTwHCll6Li2OZKX0&e= <br class=""></div></blockquote></div><br class=""></div></body></html>