<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;">Hi Lizy,<div><br></div><div>We have verified the magnetic diffusion for a current drive against some of the solutions derived in this paper: <a href="https://www.osti.gov/servlets/purl/1027976">https://www.osti.gov/servlets/purl/1027976</a></div><div><br></div><div>You can always adjust the resistivity of the conducting material to match the physics of what you’re interested in. The constant current density inside the conductor is the equilibrium solution if you’re considering only magnetic diffusion and a current carrying wire, but will always start out concentrated on the surface and diffuse inwards. If you’re not interested in capturing this transient behavior you can always increase the time step, but are always limited by the CFL condition for the hydro solver. <br id="lineBreakAtBeginningOfMessage"><div>
<div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;">*********************************************<br>Adam Reyes</div><br class="Apple-interchange-newline"><span><img alt="FLASH.jpg" src="cid:EA5A7E59-94B9-4162-879C-B52E774AEA24"></span><meta charset="UTF-8"><br style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; display: inline !important; float: none;">Code Group Leader, Flash Center for </span><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; display: inline !important; float: none;">Computational Science</span><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; 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text-decoration: none;"><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; display: inline !important; float: none;">Research Scientist, Dept. of Physics and </span><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; display: inline !important; float: none;">Astronomy</span><br style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; 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white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; display: inline !important; float: none;"> </span><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; display: inline !important; float: none;">(he / him / his)</span><br style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><span><img alt="FLASH-pride-sml.png" src="cid:CE45460D-2261-4A69-865C-5CF7BEACF620"></span><div style="caret-color: rgb(0, 0, 0); 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<div><br><blockquote type="cite"><div>On May 30, 2024, at 10:13 AM, lizy <3287940670@qq.com> wrote:</div><br class="Apple-interchange-newline"><div><meta http-equiv="Content-Type" content="text/html; charset=GB18030"><div><p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US" style="font-family: Verdana, sans-serif; background: white;">Dear Flash developers and engineers</span>,<span lang="EN-US"><o:p></o:p></span></p><p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US" style="font-family: Verdana, sans-serif;">In two-dimensional axisymmetric simulation, a thin
metal wire with high resistivity (diameter of tens of micrometers) flows
through a current, and the metal wire is surrounded by a vacuum outside. Within
a hundred nanoseconds, the actual situation should be that the current flows
through a low resistivity region, but currently, due to the magnetic field
diffusing from the outside to the inside, the internal metal diffusion
coefficient is too low. Now the current is concentrated at the vacuum metal
boundary rather than in the metal region. I used an implicit resistivitySolver,
but the final result did not match reality. Is there any good solution?</span><span lang="EN-US"><o:p></o:p></span></p><p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US" style="font-family: Verdana, sans-serif;">In addition, the process of implicit magnetic
diffusion should be a solution to the evolution of the global magnetic field,
and the magnetic field should have diffused at the initial moment. However, the
current implicit magnetic diffusion in flash seems to involve calculating the
diffusion of the magnetic field at each time step, resulting in slow diffusion
in areas with low magnetic diffusion coefficients. I still don't quite
understand the process of magnetic diffusion. </span><span lang="EN-US" style="font-family: Verdana, sans-serif; background: white;"> I would especially appreciate your patient answe</span><span style="background: white;">！</span><span style="font-family: Verdana, sans-serif; background: white;"> <span lang="EN-US"><o:p></o:p></span></span></p><p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US" style="font-family: Verdana, sans-serif; background: white;"><span style="mso-spacerun:yes">
</span><span style="mso-spacerun:yes"> </span>Lizy<o:p></o:p></span></p><p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US" style="font-family: Verdana, sans-serif; background: white;"><span style="mso-spacerun:yes">
</span><span style="mso-spacerun:yes"> </span>30,May,2024</span><span lang="EN-US"><o:p></o:p></span></p><br></div>_______________________________________________<br>flash-users mailing list<br>flash-users@flash.rochester.edu<br><br>For list info, including unsubscribe:<br>https://flash.rochester.edu/mailman/listinfo/flash-users<br></div></blockquote></div><br></div></body></html>