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<p class="MsoNormal"><span style="font-size:11.0pt">Hi Adam,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">RadFLAH refers to Radiation Flux-Limiter Aware Hydro. It uses the code in HydroMain/unsplit_rad, which is a variant of the more widely-used unsplit Hydro implementation in HydroMain/unsplit. It adds terms
to the hydro equations to treat radiation differently, and it is enabled with the setup shortcut +uhd3tR. It only uses 1 radiation group, MHD is not fully implemented, and it generally has had limited use. We do not recommend this implementation for most HEDP
problems.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">You will have better luck with the more widely-used unsplit Hydro implementation with staggered mesh MHD (setup shortcut +usm3t), and then you can also use implicit MGD for radiation transport (+mgd mgd_meshgroups=<your_number_of_radiation_groups>).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">--</span><span style="font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#181A1B">Eddie Hansen</span><span style="font-family:"Calibri",sans-serif;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><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"><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#181A1B">Flash Center for Computational Science</span><span style="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"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black">flash-users <flash-users-bounces@flash.rochester.edu> on behalf of Adam F Kowalski <Adam.F.Kowalski@Colorado.EDU><br>
<b>Date: </b>Tuesday, May 13, 2025 at 11:25 PM<br>
<b>To: </b>flash-users <flash-users@flash.rochester.edu><br>
<b>Subject: </b>[FLASH-USERS] radiation in MHD blast wave example<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt">Dear Flash users,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt">I'm trying to incorporate radiation into the MHD blast wave example (35.2.8 of manual). I see the note about RadFLAH / MGD not yet ready for MHD (Section 15.4). Is radiation with magnetic fields currently
not possible? When I try, I get an error with the temperature returned by the Eos (coincidentally, a similar problem when I try the radiating blast wave example 35.9.2 with a -2d switch on).<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt">Thanks very much,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt">Adam Kowalski<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt">Associate Professor CU Boulder<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;color:black"><o:p> </o:p></span></p>
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