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Hi Brian and the others,<br>
<br>
There is not much you can do about that I gave up trying to do such
models with Gale.<br>
It is now established Q1Q1 elements are not suited for this kind of
problems.<br>
What you can do is to<br>
1) Remove the free surface/sky to work with delta rho instead of rho<br>
2) Increase the resolution.<br>
<br>
Basically you should only use these elements for extended thin shit
problems. <br>
<br>
The old Q1P0 had other problems, but they could be used to model
drip/subduction problems.<br>
<br>
If CIG still wants to spend some time/money on Gale<br>
It would be usefull to have a switch between elements, like in UW so
that depending on the model set up we can choose the best suited
element.<br>
<br>
hope this was helpfull<br>
<br>
Laetitia<br>
<br>
On 9/24/11 12:44 AM, Brian Wilson wrote:
<blockquote
cite="mid:CAPRTR0FGSorf-aKNkDZq=EWysYWk=4=aSGS7gvp_0mxFBNc0Tg@mail.gmail.com"
type="cite">Hi all,<br>
<br>
I'm working on a model of lithospheric drip and despite having
zero flux on the boundaries, I am getting downward velocities with
no compensating upwelling, which would seem to violate the
divergence free condition. Has anybody else had a similar problem
and/or figured out a solution? I've attached a copy of my input
file if anyone wants to look at it; everything is scaled as
follows: distance: km, mass: 10^15 kg, time: m.y.<br>
<br>
Thanks,<br>
Brian<br>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
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<br>
<br>
<div class="moz-signature">-- <br>
<b>Dr Laetitia Le Pourhiet</b><\n>
MCF - Institut des Sciences de la Terre Paris - UPMC<\n>
tel : +33 1 44 27 58 83<\n>
web :
<a class="moz-txt-link-freetext" href="http://perso.numericable.com/laetitia.le.pourhiet/index.html">http://perso.numericable.com/laetitia.le.pourhiet/index.html</a><\n></div>
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