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<span style="font-size: 11pt;">Hi Klaus,</span></div>
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<span style="font-size: 11pt;">Some months ago, you emailed me on how gamc is computed per component per material in FLASH as follows:</span></div>
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<b><i><span style="font-family: "Segoe UI", "Segoe UI Web (West European)", "Segoe UI", -apple-system, system-ui, Roboto, "Helvetica Neue", sans-serif; font-size: 14.6667px; background-color: rgb(255, 255, 255); display: inline !important"> eosData(gamc+i)
= eosData(tempToUse+i)/eosData(dens+i) * &</span><br style="font-family: "Segoe UI", "Segoe UI Web (West European)", "Segoe UI", -apple-system, system-ui, Roboto, "Helvetica Neue", sans-serif; font-size: 14.6667px; background-color: rgb(255, 255, 255)">
<span style="font-family: "Segoe UI", "Segoe UI Web (West European)", "Segoe UI", -apple-system, system-ui, Roboto, "Helvetica Neue", sans-serif; font-size: 14.6667px; background-color: rgb(255, 255, 255); display: inline !important">
eosData(dpt+i)**2 / eosData(det+i) &</span><br style="font-family: "Segoe UI", "Segoe UI Web (West European)", "Segoe UI", -apple-system, system-ui, Roboto, "Helvetica Neue", sans-serif; font-size: 14.6667px; background-color: rgb(255, 255, 255)">
<span style="font-family: "Segoe UI", "Segoe UI Web (West European)", "Segoe UI", -apple-system, system-ui, Roboto, "Helvetica Neue", sans-serif; font-size: 14.6667px; background-color: rgb(255, 255, 255); display: inline !important">
+ eosData(dens+i) * eosData(dpd+i)</span><br style="font-family: "Segoe UI", "Segoe UI Web (West European)", "Segoe UI", -apple-system, system-ui, Roboto, "Helvetica Neue", sans-serif; font-size: 14.6667px; background-color: rgb(255, 255, 255)">
<br style="font-family: "Segoe UI", "Segoe UI Web (West European)", "Segoe UI", -apple-system, system-ui, Roboto, "Helvetica Neue", sans-serif; font-size: 14.6667px; background-color: rgb(255, 255, 255)">
<span style="font-family: "Segoe UI", "Segoe UI Web (West European)", "Segoe UI", -apple-system, system-ui, Roboto, "Helvetica Neue", sans-serif; font-size: 14.6667px; background-color: rgb(255, 255, 255); display: inline !important">where dpt represent d Pres
/ d T, det represents d E / d T, and dpd</span><br style="font-family: "Segoe UI", "Segoe UI Web (West European)", "Segoe UI", -apple-system, system-ui, Roboto, "Helvetica Neue", sans-serif; font-size: 14.6667px; background-color: rgb(255, 255, 255)">
<span style="font-family: "Segoe UI", "Segoe UI Web (West European)", "Segoe UI", -apple-system, system-ui, Roboto, "Helvetica Neue", sans-serif; font-size: 14.6667px; background-color: rgb(255, 255, 255); display: inline !important">represents d Pres / d rho.
Each of those derivative terms in computed</span><br style="font-family: "Segoe UI", "Segoe UI Web (West European)", "Segoe UI", -apple-system, system-ui, Roboto, "Helvetica Neue", sans-serif; font-size: 14.6667px; background-color: rgb(255, 255, 255)">
<span style="font-family: "Segoe UI", "Segoe UI Web (West European)", "Segoe UI", -apple-system, system-ui, Roboto, "Helvetica Neue", sans-serif; font-size: 14.6667px; background-color: rgb(255, 255, 255); display: inline !important">from finite differences
of values from Pres(T,rho) and E(T,rho) tables.</span></i></b><br>
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<span style="font-family: "Segoe UI", "Segoe UI Web (West European)", "Segoe UI", -apple-system, system-ui, Roboto, "Helvetica Neue", sans-serif; font-size: 14.6667px; background-color: rgb(255, 255, 255); display: inline !important"><br>
</span></div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<span style="font-family: "Segoe UI", "Segoe UI Web (West European)", "Segoe UI", -apple-system, system-ui, Roboto, "Helvetica Neue", sans-serif; font-size: 14.6667px; background-color: rgb(255, 255, 255); display: inline !important">But how are gamc for each
component (ele, ion, rad) initialized in the simulation? I might be able to figure out the earlier issue if I can understand this part ie initialization of per component gamma values (both for tabulated and gamma law EOS).</span></div>
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<span style="font-family: "Segoe UI", "Segoe UI Web (West European)", "Segoe UI", -apple-system, system-ui, Roboto, "Helvetica Neue", sans-serif; font-size: 14.6667px; background-color: rgb(255, 255, 255); display: inline !important"><br>
</span></div>
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<span style="font-family: "Segoe UI", "Segoe UI Web (West European)", "Segoe UI", -apple-system, system-ui, Roboto, "Helvetica Neue", sans-serif; font-size: 14.6667px; background-color: rgb(255, 255, 255); display: inline !important">Thanks,</span></div>
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<span style="font-family: "Segoe UI", "Segoe UI Web (West European)", "Segoe UI", -apple-system, system-ui, Roboto, "Helvetica Neue", sans-serif; font-size: 14.6667px; background-color: rgb(255, 255, 255); display: inline !important">Nitish</span></div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> flash-users-bounces@flash.uchicago.edu <flash-users-bounces@flash.uchicago.edu> on behalf of Acharya, Nitish <nachary2@ur.rochester.edu><br>
<b>Sent:</b> Tuesday, September 22, 2020 5:09 PM<br>
<b>To:</b> Klaus Weide <klaus@flash.uchicago.edu>; flash-users@flash.uchicago.edu <flash-users@flash.uchicago.edu><br>
<b>Subject:</b> Re: [FLASH-USERS] [EXT] Re: Computed hydro dt is not positive</font>
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Hi Klaus,</div>
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Thank you for your suggestions. </div>
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I checked my EOS file <i>which I have attached here</i>. The data (<b><i>species #2</i></b>) looks just fine but I am still getting the same error right during driver initialization. I have tried reducing the time step and tried to tune couple more runtime
params but the error persists. It's just hard to know at this point what's causing this error. </div>
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I would really appreciate your help,</div>
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Thanks,</div>
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Nitish</div>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> flash-users-bounces@flash.uchicago.edu <flash-users-bounces@flash.uchicago.edu> on behalf of Klaus Weide <klaus@flash.uchicago.edu><br>
<b>Sent:</b> Thursday, September 17, 2020 2:34 PM<br>
<b>To:</b> flash-users@flash.uchicago.edu <flash-users@flash.uchicago.edu><br>
<b>Subject:</b> [EXT] Re: [FLASH-USERS] Computed hydro dt is not positive</font>
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<div class="x_PlainText">On Thu, 17 Sep 2020, Acharya, Nitish wrote:<br>
<br>
> I have been applying the analytical ideal gas EOS to simulate my <br>
> material for a LaserSlab based problem. Recently, instead of using an <br>
> equation, I used the same ideal gas model and built a tabulated IONMIX <br>
> EOS. However, as I use the tabulated EOS for the simulation, I've been <br>
> repeatedly getting an error during driver initialization<br>
<br>
FLASH should generate a file EOS_printout_tables.txt when it starts up.<br>
The first thing I would do is carefully check that file: <br>
<br>
* Do all the data make sense?<br>
* Are all values positive that physically should be positive<br>
(energies, pressures)? <br>
* Are all pressures and energies monotonically increasing with increasing <br>
temperature?<br>
* You should have a nonzero Z(T,density) function (shown under the <br>
heading IONIZATION DATA in the printout file); it should be constant<br>
if your EOS table file is meant to exactly represent a (3T) Gamma Eos.<br>
<br>
Klaus<br>
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