<div dir="ltr">Jody,<div><br></div><div>I assume you are talking about the config you got from Dhruv. The values we use in those runs were taken from Dimitris Menemenlis and Chris Hill's LLC simulations. The exact same settings are used for 1/12, 1/24, and 1/48 degree global simulations. (Although I do recall that Dhruv had to make some changes related to boundary conditions.)</div><div><br></div><div>-Ryan</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Apr 16, 2018 at 8:59 AM, Malte Jansen <span dir="ltr"><<a href="mailto:mfj@uchicago.edu" target="_blank">mfj@uchicago.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Just to add on to this: the Leith viscosity is supposed to be "scale aware" (at least within a QG turbulence regime), such that the non-dimensional coefficient should be independent of the grid-scale.<br>
<br>
-Malte<div class="HOEnZb"><div class="h5"><br>
<br>
<br>
On 4/16/18 3:16 AM, Martin Losch wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi Jody,<br>
<br>
my reference is pkg/mom_common/mom_calc_visc.F where you can find this:<br>
<br>
C RECOMMENDED VALUES<br>
C viscC2Leith=1-3<br>
C viscC2LeithD=1-3<br>
C viscC4Leith=1-3<br>
C viscC4LeithD=1.5-3<br>
C viscC2smag=2.2-4 (Griffies and Hallberg,2000)<br>
C 0.2-0.9 (Smagorinsky,1993)<br>
C viscC4smag=2.2-4 (Griffies and Hallberg,2000)<br>
<br>
And I think this is where it is described:<br>
B. Fox-Kemper and D. Menemenlis. Can large eddy simulation techniques improve mesoscale-rich ocean models? In M. Hecht and H. Hasumi, editors, Ocean Modeling in an Eddying Regime, volume 177, pages 319-338. AGU Geophysical Monograph Series, 2008.<br>
<a href="http://www.geo.brown.edu/research/Fox-Kemper/pubs/pdfs/FoxKemperMenemenlis08.pdf" rel="noreferrer" target="_blank">http://www.geo.brown.edu/resea<wbr>rch/Fox-Kemper/pubs/pdfs/FoxKe<wbr>mperMenemenlis08.pdf</a><br>
<br>
Martin<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
On 14. Apr 2018, at 22:42, Jody Klymak <<a href="mailto:jklymak@uvic.ca" target="_blank">jklymak@uvic.ca</a>> wrote:<br>
<br>
<br>
Hi all,<br>
<br>
Is there a good reference and/or ruls of thumb for choosing the Leith biharmonic co-efficient? i.e. `viscC4Leith` and `viscC4Leithd`, with particular interest in how the size of the grid affects the choice? I’m using someone else’s setup, using Leith works great for making the flow look reasonable, but it would be nice if it was turned down as much as possible, particularly when I downscale to a smaller grid size…<br>
<br>
Thanks a lot, Jody<br>
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<br></div></div><span class="HOEnZb"><font color="#888888">
-- <br>
Malte F Jansen<br>
Assistant Professor<br>
Department of the Geophysical Sciences<br>
The University of Chicago<br>
5734 South Ellis Avenue<br>
Chicago, IL 60637 USA</font></span><div class="HOEnZb"><div class="h5"><br>
<br>
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