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For Z-pinch problems to work properly with the rest of FLASH, you should not change the unit system from its default value. There are certain material properties and MHD routines in FLASH that assume the default unit system.</div>
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So the units in the output are (mostly) CGS. B-fields are scaled by a factor of sqrt(4 pi), so you multiply an output variable like 'magx' by this factor to get G. Current is tricker. If you're talking about a 'circuit.dat' output file, then the units should
be A. If you're referring to current densities like 'cury' in the output, then you have to multiply by 10^5 / sqrt(4 pi) to get A/m^2.</div>
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For the species, you first have to add them to the species=fill,line,vacu list inside the setup command, and they cannot be longer than 4 characters.</div>
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<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;"><span style="font-family: Arial, sans-serif; font-size: 12pt; color: rgb(24, 26, 27);">Eddie Hansen</span></p>
<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;"><span style="font-family: Arial, sans-serif; font-size: 12pt; color: rgb(24, 26, 27);">Applications Group Leader</span></p>
<p style="margin: 0in; font-family: Calibri, sans-serif; font-size: 11pt;"><span style="font-family: Arial, sans-serif; font-size: 12pt; color: rgb(24, 26, 27);">Flash Center for Computational Science</span></p>
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<b>From: </b>flash-users <flash-users-bounces@flash.rochester.edu> on behalf of lizy <3287940670@qq.com><br>
<b>Date: </b>Sunday, June 29, 2025 at 10:13 PM<br>
<b>To: </b>flash-users <flash-users@flash.rochester.edu><br>
<b>Subject: </b>[FLASH-USERS] questions about 1. Unit system 2. Adding additional types of substances<br>
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<div class="ms-outlook-mobile-reference-message skipProofing">Dear Flash developers and users,</div>
<div class="ms-outlook-mobile-reference-message skipProofing">I have two questions about zpinch simulation and hope to receive your answers.</div>
<div class="ms-outlook-mobile-reference-message skipProofing">1.In the zpinch case, the units of output data, such as current in A/m2 and speed in cm/s, are they correct?</div>
<div class="ms-outlook-mobile-reference-message skipProofing">2.In the 'Simulation_initblock' file, I added substances other than 'fill, line, vacu', such as' line1, line2, line3 ', and defined them in the flash. par file, but why is there only the mass percentage
of' fill, line, vacu 'in the output file? (For example, It is supposed to output the quality scores for "fill, line, vacu, line1, line2, line3",but the result is "fill, line, vacu, line, line,line") </div>
<div class="ms-outlook-mobile-reference-message skipProofing">Thank you very much for your answers.</div>
<div class="ms-outlook-mobile-reference-message skipProofing">lizy</div>
<div class="ms-outlook-mobile-reference-message skipProofing">6.30.2025</div>
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