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Hi Taichi,<br>
<br>
DivergenceForce imposes a positive divergence on the designated
elements. DivergenceForce=0 will impose nothing and if its applied to
the center of the ridge axis it will behave as M=0. To get M=1 (100%
plate spreading accommodated magmatically), then you'll have to set
DivergenceForce appropriately for the dike zone width and imposed
spreading rate. <br>
<br>
But again, as I recall, Gale was not imposing the divergence that I had
set it to in the rifting example. In order to get the behavior you
seek, you'll probably have to experiment with what you set
DivergenceForce to as well as how many elements it is applied across
(in the x-direction) . E.g., plot horizontal velocity across the
dike zone for a given DivergenceForce, dike zone width and see what you
get. <br>
<br>
Walter, from what I recall I dont think we got this issue (as well as
my weird "bat ears") sorted out. Perhaps its related to the linear
pressure-elements, which do not do as good a allowing an abrupt change
in pressure?<br>
<br>
Garrett<br>
<br>
Taichi SATO wrote:
<blockquote cite="mid:4AEEC2FD.3010003@ori.u-tokyo.ac.jp" type="cite">
<pre wrap="">Hello,
I now try to create axial vally and axial high by using Gale, but I do
not still understand how to specify melt supply rate. As Walter said
earlier to me the way as below,
</pre>
<blockquote type="cite">
<pre wrap="">" In any case, the left and right sides are both moving at 4e-10 m/s.
</pre>
</blockquote>
<pre wrap=""><!---->The dike is 2000 m across. If the
</pre>
<blockquote type="cite">
<pre wrap="">divergence was completely accounted for in the dike, then we get a
</pre>
</blockquote>
<pre wrap=""><!---->divergence of
</pre>
<blockquote type="cite">
<pre wrap=""> 2*4e-10/2000 = 4e-13
The input file scales time by 1e22, so in the scaled units that becomes
4e9
So in this example, the divergence would only account for 20% of the
</pre>
</blockquote>
<pre wrap=""><!---->expansion. "
But the result is not axial high and something strange.
I think that DivergenceForces = 0 means full melt supply(M=1), is it
correct?
Would you tell me how to specify melt supply rate.
And I have another question.
Should I specify water property(hydrostatic term) for modeling mid-ocean
ridge process?
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</pre>
</blockquote>
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<p class="MsoNormal"><span style="font-size: 9pt; font-family: Arial;">=====================================<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 9pt; font-family: Arial;">Prof.
Garrett Ito<span style=""> </span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 9pt; font-family: Arial;">SOEST,
Geology & Geophysics<span style=""> </span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 9pt; font-family: Arial;">1680
East-West Rd., POST 810<span style=""> </span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 9pt; font-family: Arial;">Univ.
of
Hawaii<span style=""> </span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 9pt; font-family: Arial;">Honolulu,
HI
96822 USA<span style=""> </span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 9pt; font-family: Arial;"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size: 9pt; font-family: Arial;">808-956-9717<span
style=""> </span><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 9pt; font-family: Arial;"><a class="moz-txt-link-abbreviated" href="mailto:gito@hawaii.edu">gito@hawaii.edu</a>
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 9pt; font-family: Arial;"><a class="moz-txt-link-abbreviated" href="http://www.soest.hawaii.edu/GG/FACULTY/ITO">www.soest.hawaii.edu/GG/FACULTY/ITO</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size: 9pt; font-family: Arial;">======================================<o:p></o:p></span></p>
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