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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Aptos",sans-serif">Hi Jesse,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Aptos",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Aptos",sans-serif">Your data appears to already be 2D, so there’s nothing to choose for slicing or averaging in the z-direction. In 2D, FLASH assumes a dz = 1.0 cell width in that direction for
some calculations, but the size of the data in the z-direction is always 1 (regardless of AMR level) as you showed in yt’s domain_dimensions output.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Aptos",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal" align="left" style="text-align:left"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#181A1B">Eddie Hansen</span><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="text-align:left"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#181A1B">Applications Group Leader<o:p></o:p></span></p>
<p class="MsoNormal" align="left" style="text-align:left"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#181A1B">Flash Center for Computational Science</span><span style="font-size:10.0pt;font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Aptos",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal" align="left" style="margin-bottom:12.0pt;text-align:left"><b><span lang="EN-GB" style="font-size:12.0pt;font-family:"Aptos",sans-serif;color:black">From:
</span></b><span lang="EN-GB" style="font-size:12.0pt;font-family:"Aptos",sans-serif;color:black">flash-users <flash-users-bounces@flash.rochester.edu> on behalf of Jesse Chen <cxxgc@msn.com><br>
<b>Date: </b>Thursday, March 20, 2025 at 5:57 AM<br>
<b>To: </b>flash-users@flash.rochester.edu <flash-users@flash.rochester.edu><br>
<b>Subject: </b>[FLASH-USERS] Question about analyzing electron density and temperature in FLASH HDF5 files with yt<o:p></o:p></span></p>
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<p class="MsoNormal">Dear FLASH Users and Engineers,<span lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"> <span lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal">I hope this email finds you well. I am currently working with FLASH-generated HDF5 files and using the Python yt package to analyze electron number density and electron temperature in
<b>Cartesian x-y coordinates, </b>AMR meshes.<span lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"> <span lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal">I've noticed some inconsistencies in my results when dealing with AMR data, and I'm wondering about the proper methodology. Specifically, I would like to know:<span lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"> <span lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal">1. When analyzing electron density and temperature in x-y coordinates with AMR data, should I take a specific z-slice (if so, what value of z is typically recommended)? or<span lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"> <span lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal">2. Should I instead calculate the mean values across all z coordinates? (My Nz =8 for my current simulation case)<span lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"> <span lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal">FYI, the dimensions of my simulation is as follows, <span lang="EN-GB">
<o:p></o:p></span></p>
<p class="MsoNormal"> <span lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">yt : [INFO ] 2025-03-20 17:17:23,436 Parameters: domain_dimensions = [ 48 144 1]<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">yt : [INFO ] 2025-03-20 17:17:23,436 Parameters: domain_left_edge = [-0.75 -0.06 0. ]<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">yt : [INFO ] 2025-03-20 17:17:23,436 Parameters: domain_right_edge = [0.75 4.44 1. ]<o:p></o:p></span></p>
<p class="MsoNormal"> <span lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal">I've seen both approaches in some datasets (labeled as "slice0" and "mean"), but I'm not sure which is the standard practice for this type of analysis. Any guidance on best practices or considerations that might affect this decision would
be greatly appreciated.<span lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"> <span lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal">Thank you for your time and expertise.<span lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"> <span lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal">Best regards,<span lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"> <span lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal">Jesse<span lang="EN-GB"><o:p></o:p></span></p>
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