[MITgcm-support] MITgcm-support Digest, Vol 174, Issue 16
Jean-Michel Campin
jmc at mit.edu
Wed Dec 27 12:27:18 EST 2017
Hi Yi Liu,
I would like to make 2 comments here:
1) It's better to send message to the list as "plain text"
instead of html format:
a) html message do not get archived in a nice way, see for example:
http://mailman.mitgcm.org/pipermail/mitgcm-support/2017-December/011393.html
b) I personally don't read html format message (less thing to care about),
but it's a detail.
2) If you are subscribed to receive emails once a day (daily digest), they
will come with subject: "MITgcm-support Digest, Vol ..."
So when you answer one of these emails, please follow the advise that you
get at the end of the email:
> When replying, please edit your Subject line so it is more specific
> than "Re: Contents of MITgcm-support digest..."
Cheers,
Jean-Michel
On Wed, Dec 27, 2017 at 10:41:34PM +0800, liuyi315 wrote:
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> <div><span style="font-family: Verdana, ????????????, ??????, sans-serif; line-height: 22.4px; white-space: pre-wrap;">Hi, Dr. Bertrand,</span></div><div><span style="font-family: Verdana, ????????????, ??????, sans-serif; line-height: 22.4px; white-space: pre-wrap;"><br></span></div><div><span style="font-family: Verdana, ????????????, ??????, sans-serif; line-height: 22.4px; white-space: pre-wrap;">Thanks! I have followed up your advice to do the momentum balance, and the equation is as follows:</span></div><div><span style="font-family: Verdana, ????????????, ??????, sans-serif; line-height: 22.4px; white-space: pre-wrap;"> </span><span style="line-height: 22.4px;">TOTUTEND/86400=-g*d(Eta)/dx+Um_Diss+Um_Advec+Um_dPHdx+Um_Ext+AB_gU+VISrI_Um</span></div><div>note that, (1) I did not use CD scheme (2) I used <span style="line-height: 22.4px;">implicit vertical viscosity (3) I took into account the AB effect..</span></div><div>Unfortunately, the equation still could not balance... I chose snapshot <span style="line-height: 22.4px;">(not time-averaged) </span><span style="line-height: 1.6;">outputs, and selected the surface layer for the computation. I am very confused about it and do not know where is wrong. </span></div><div>Any suggestions is welcome! Thanks again.</div><div><br></div><div>Best, </div><div>Yi Liu</div><div id="ntes-pcmail-signature" style="font-family:'?????????'">
>
> </div></div><div class="J-reply" style="background-color:#f2f2f2;color:black;padding-top:6px;padding-bottom:6px;border-radius:3px;-moz-border-radius:3px;-webkit-border-radius:3px;margin-top:45px;margin-bottom:20px;font-family:'?????????';">
> <div style="font-size:14px;line-height:1.5;word-break:break-all;margin-left:10px;margin-right:10px">On <span class="mail-date">12/26/2017 23:28</span>???<a class="mail-to" style="text-decoration:none;color:#2a83f2;" href="mailto:mitgcm-support-request at mitgcm.org"><mitgcm-support-request at mitgcm.org></a> wrote??? </div>
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> <br>Today's Topics:
> <br>
> <br> 1. Re: [mitgcm-support] On the horizontal momentum budget in the
> <br> MITgcm (Bertrand Louis Rene Delorme)
> <br> 2. Re: Zeroing quantities in the bottom (Jean-Michel Campin)
> <br> 3. flow over 3d Gaussian topography (subhajit kar)
> <br>
> <br>
> <br>----------------------------------------------------------------------
> <br>
> <br>Message: 1
> <br>Date: Tue, 26 Dec 2017 09:46:15 +0000
> <br>From: Bertrand Louis Rene Delorme <bdelorme at stanford.edu>
> <br>To: "mitgcm-support at mitgcm.org" <mitgcm-support at mitgcm.org>
> <br>Subject: Re: [MITgcm-support] [mitgcm-support] On the horizontal
> <br> momentum budget in the MITgcm
> <br>Message-ID: <BEB4D437-A4BC-4813-81F8-E2A237F83526 at stanford.edu>
> <br>Content-Type: text/plain; charset="utf-8"
> <br>
> <br>Hi Yi Liu,
> <br>
> <br>Not sure that it will help but here are a few points to check:
> <br>
> <br>- If you don?t use the CD-Scheme, then Um_Advec already contains the Coriolis term.
> <br>
> <br>- If you use implicit vertical viscosity, that needs to be added (using the flux diagnostic VISrI_Um).
> <br>
> <br>- The AB effect ? who should be small - should be added with the diagnostic AB_gU.
> <br>
> <br>Best,
> <br>Bertrand
> <br>
> <br>
> <br>De : MITgcm-support <mitgcm-support-bounces at mitgcm.org> au nom de liuyi315 <liuyi315 at mails.ucas.ac.cn>
> <br>R?pondre ? : "mitgcm-support at mitgcm.org" <mitgcm-support at mitgcm.org>
> <br>Date : lundi 25 d?cembre 2017 ? 1:54 PM
> <br>? : mitgcm-support <mitgcm-support at mitgcm.org>
> <br>Objet : [MITgcm-support] [mitgcm-support] On the horizontal momentum budget in the MITgcm
> <br>
> <br>Dear all,
> <br>
> <br>Now I am using MITgcm to study the effects of tidal mixing in the Indonesian Seas. I have encountered a problem. I am trying to do the momentum budget analysis using the following equation:
> <br>?TOTUTEND/86400=-g*d Eta/dx+Um_Diss+Um_Advec+Um_Cori+Um_dPHdx+Um_Ext"
> <br>However, the left term could not balance the right and the difference between them is very large. I am not sure whether I have mistakenly ignored some terms or not.
> <br>Could anyone give me some suggestions? Thanks very much.
> <br>
> <br>Best,
> <br>Yi Liu
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> <br>
> <br>Message: 2
> <br>Date: Tue, 26 Dec 2017 08:39:53 -0500
> <br>From: Jean-Michel Campin <jmc at mit.edu>
> <br>To: mitgcm-support at mitgcm.org
> <br>Subject: Re: [MITgcm-support] Zeroing quantities in the bottom
> <br>Message-ID: <20171226133953.GA26957 at ocean.mit.edu>
> <br>Content-Type: text/plain; charset=iso-8859-1
> <br>
> <br>Hi Rahele,
> <br>
> <br>Did you check that the model bottom level (k=Nr) is not empty ?
> <br>This can easily be done by looking at the last level (k=Nr) of grid file
> <br>variables hFacC, hFacW or hFacS : if all zero, then it means that there
> <br>is no water there and therefore T,S,U,V would also be zero.
> <br>
> <br>Cheers,
> <br>Jean-Michel
> <br>
> <br>On Tue, Dec 19, 2017 at 10:01:15PM +0000, rahele shafiee wrote:
> <br>>
> <br>> Hi everyone
> <br>>
> <br>> I have modeled the northern india region. I have usedpackages ???mnc??? and ???obcs???. When it comes to model outputs at points,temperatures, salinity, U, and V ?reach? reaches zero at?the bottom (seabed)?. Can anyone guide me what I've done wrong
> <br>> Thank youRahele
> <br>
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> <br>------------------------------
> <br>
> <br>Message: 3
> <br>Date: Tue, 26 Dec 2017 20:50:10 +0530
> <br>From: subhajit kar <subhajitkar19 at gmail.com>
> <br>To: mitgcm-support at mitgcm.org
> <br>Subject: [MITgcm-support] flow over 3d Gaussian topography
> <br>Message-ID:
> <br> <CABUV2NiZMAD0DDxnJ4UM2hn6WTjMyC1FinhKOd2QoN9Ua6ZQmg at mail.gmail.com>
> <br>Content-Type: text/plain; charset="utf-8"
> <br>
> <br>Hi all,
> <br>
> <br> I am trying model a flow over a Gaussian topography using exp4 example.
> <br>
> <br> I should a surface imprint of topography on the free surface according
> <br>to hydraulic theory.
> <br>
> <br> I am getting something which is not exactly surface imprint. I have
> <br>attached a snapshot of surface elevation due to topography.
> <br>
> <br> Also the boundary has a zero surface height value.
> <br>
> <br> Is there any way I can give a periodic boundary condition?
> <br>
> <br>
> <br>Thanks,
> <br>Subhajit
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