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Hi Paul,</div>
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You can try the following par file options if you haven't already, which helped me to get some laserslab runs working back in FLASH4.7 (adjust accordingly if you're not doing a 3T sim):</div>
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dr_usePOSdefComputeDt = .true.</div>
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dr_posdefdtfactor = 0.1</div>
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dr_numPosdefVars = 3</div>
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dr_posdefVar_1 = "eele"</div>
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dr_posdefVar_2 = "eion"</div>
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dr_posdefVar_3 = "erad"</div>
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The dr_posdefdtfactor of 0.1 might be a bit aggressive (i.e. too small), I haven't played with it. </div>
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Graeme</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 <flash-users-bounces@flash.rochester.edu> on behalf of Paul Campbell <Paul.Campbell@zap.energy><br>
<b>Sent:</b> Tuesday, November 5, 2024 1:37 PM<br>
<b>To:</b> flash-users@flash.rochester.edu <flash-users@flash.rochester.edu><br>
<b>Subject:</b> [FLASH-USERS] Negative Internal Energies in the 2D, AMR, Z-Pinch problem</font>
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<p class="x_MsoNormal">Hello,</p>
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<p class="x_MsoNormal">I am attempting to get the 2D Z-pinch problem working with AMR but have been unable to get the sim to run without crashing . From the logs, I appear to be running into many negative internal energy warnings. It looks like both the electron
and ion temperatures/energies need to be continuously corrected. To try and address this issue, I have tried refining on density, electron, and ion temperatures but the warnings persist. In terms of the AMR settings, I am using a 32x32 grid with 4x4 cells,
a lrefine_max=4, and I have left the refinement cutoffs and filters unchanged from default. My questions are:</p>
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<li class="x_MsoListParagraph" style="margin-left:0in">Is this an issue with the AMR settings, would a finer grid fix this problem?</li><li class="x_MsoListParagraph" style="margin-left:0in">Should I be refining on different parameters?</li><li class="x_MsoListParagraph" style="margin-left:0in">Is this an issue with a non-AMR setting?</li></ol>
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<p class="x_MsoNormal" style=""><span style="font-family:"Calibri",sans-serif">Paul Campbell<br>
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