<meta http-equiv="Content-Type" content="text/html; charset=utf-8"><div dir="ltr">It looks to me to be a result of too much numerical diffusion. What CFL is being used? What order? Solver? Send your <i>flash.par</i> Benbayer when you get the chance.<div><br></div><div>I am also curious if the expansion looks the same if you multiply it only by the target species mass fraction for the same pseudo-color scale of density (same min/max).</div><div><br></div><div>Best,</div><div>Marissa</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Feb 16, 2022 at 2:41 PM Andy Sha Liao <andy@f.energy> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>Scott,</div><div><br></div><div><br></div><div>The target is not expanding nearly as much on the rear side as it is on the front. If the problem is as you described, then the target should expand from both vacuum interfaces, but only the irradiated side is affected. </div><div><br></div><div><br></div><div>Andy</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Feb 15, 2022 at 2:33 PM Scott Feister <<a href="mailto:sfeister@gmail.com" target="_blank">sfeister@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex"><div dir="ltr">Hi Benbayer,<div><br></div><div>This is a well-known issue in our community, for those studying laser-plasma interactions. FLASH treats everything as a plasma. There are no chemical bonds (e.g. solids physics, liquids physics) which are in the code and would physically prevent such expansion. One workaround can be explained better by others, is to "freeze" the hydrodynamics on cells who do not exceed a certain temperature. We can do that using a variable in flash called "BDRY". I will leave it to others to elaborate.</div><div><br></div><div>As a starting point, search through our past forum discussions for "BDRY". For example, here's a good syntax in Google to search the entire FLASH website:</div><div>"BDRY site:<a href="https://flash.rochester.edu/" target="_blank">https://flash.rochester.edu/</a>"</div><div><br></div><div><a href="https://www.google.com/search?q=BDRY+site%3Ahttps%3A%2F%2Fflash.rochester.edu%2F&oq=BDRY+site%3Ahttps%3A%2F%2Fflash.rochester.edu%2F&aqs=chrome..69i57.4755j0j4&sourceid=chrome&ie=UTF-8" target="_blank">https://www.google.com/search?q=BDRY+site%3Ahttps%3A%2F%2Fflash.rochester.edu%2F&oq=BDRY+site%3Ahttps%3A%2F%2Fflash.rochester.edu%2F&aqs=chrome..69i57.4755j0j4&sourceid=chrome&ie=UTF-8</a><br></div><div><br></div><div>Hope this helps!</div><div><br></div><div>-Scott</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Feb 15, 2022 at 4:14 AM kouider benbayer <<a href="mailto:benbayer.kouider@gmail.com" target="_blank">benbayer.kouider@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div><font size="4" color="#202124">Hi all<font face="Google Sans, Roboto, RobotoDraft, Helvetica, Arial, sans-serif">.</font></font></div><div><font color="#202124"><font face="Google Sans, Roboto, RobotoDraft, Helvetica, Arial, sans-serif"><font style="font-size:17pt" size="5">I have observed a problem of expansion of the whole target over
time instead of expansion at the point where the laser is focused. <br></font></font></font></div><div><font color="#202124"><font face="Google Sans, Roboto, RobotoDraft, Helvetica, Arial, sans-serif"><font style="font-size:17pt" size="5">
<span></span></font></font></font><font color="#202124"><font face="Google Sans, Roboto, RobotoDraft, Helvetica, Arial, sans-serif"><font style="font-size:17pt" size="5">I
am attaching the pseudo plot of density which shows the expansion of
the target.</font></font></font></div><div><font color="#202124"><font face="Google Sans, Roboto, RobotoDraft, Helvetica, Arial, sans-serif"><font style="font-size:17pt" size="5">Can anyone have a solution to this issue?</font></font></font></div><div><font color="#202124"><font face="Google Sans, Roboto, RobotoDraft, Helvetica, Arial, sans-serif"><font style="font-size:17pt" size="5">Best regards.</font></font></font></div><div><font color="#202124"><font face="Google Sans, Roboto, RobotoDraft, Helvetica, Arial, sans-serif"><font style="font-size:17pt" size="5">Benbayer.<br></font></font></font></div></div>
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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><font face="monospace" size="1" color="#000000">%---------------------------------------------%</font><div><font face="monospace" size="1" color="#000000">Marissa B. P. Adams</font></div><div><font face="monospace" size="1" color="#000000">(she/her/hers)</font></div><div><font face="monospace" size="1" color="#000000">Phd Candidate, University of Rochester</font></div><div><font size="1"><b style="color:rgb(0,0,0);font-family:monospace">E-mail:</b><span style="color:rgb(0,0,0);font-family:monospace"> <a href="mailto:madams@pas.rochester.edu" target="_blank">madams@pas.rochester.edu</a></span><br></font></div><div><font face="monospace" size="1" color="#000000"><b>Website:</b> <a href="http://www.pas.rochester.edu/~madams#" target="_blank">https://www.pas.rochester.edu/~madams</a></font></div><div><font size="1"><b style="color:rgb(0,0,0);font-family:monospace">Current Location:</b><br></font></div><div><font color="#000000" face="monospace" size="1">Occupied Seneca Land</font></div><div><font color="#000000" face="monospace" size="1">471 Bausch and Lomb Hall</font></div><div><font color="#000000" face="monospace" size="1">University of Rochester</font></div><div><font color="#000000" face="monospace" size="1">Rochester, NY 14627</font></div></div></div></div></div></div>