<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">Hi Roman,<div><br></div><div>Thanks for the quick response. Using the lrefine_min_init=2 (I also did =3) worked fine and with lrefine_max set 8 gives me a few resolution elements for the amplitude of the perturbation. I have also updated the domain and nblockx/nblocky to reflect a square cell.</div><div><br></div><div>… now if I only had some more processors to run the simulation on. :)</div><div><br></div><div>Any thoughts on setting -maxblocks in the setup file? I originally had the default (1000 I think), and I’ve now upped it to 5000. My computer hasn’t exploded yet, but I’m not really familiar with what determines an optimum number for maxblocks.</div><div><br></div><div>Cheers,</div><div>Mario</div><div><br></div><div apple-content-edited="true">
<div style="color: rgb(0, 0, 0); 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; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div style="color: rgb(0, 0, 0); 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; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">______________________________________</div><div style="color: rgb(0, 0, 0); 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; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"> <span class="Apple-converted-space"> </span></div><div style="color: rgb(0, 0, 0); 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; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">Dr. Mario Manuel<br>Einstein Postdoctoral Fellow, Smithsonian Astrophysical Observatory<br><a href="mailto:mmanuel@umich.edu">mmanuel@umich.edu</a><br>617-899-8381<br><br>University of Michigan<br>Space Research Building<br>2455 Hayward Street<br>Ann Arbor, MI 48109<br>Office: 734-764-4585<br></div><div style="color: rgb(0, 0, 0); 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; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;">______________________________________</div></div>
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<br><div><div>On Sep 16, 2014, at 4:40 AM, Roman Yurchak <<a href="mailto:roman.yurchak@crans.org">roman.yurchak@crans.org</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div style="font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: 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;">Hi Mario,<br><br>I think you must be missing the the lrefine_min_init parameter in your<br>flash.par that sets the minimum number of refinement levels at init time.<br><br>For instance with nxb==nxy==16, to resolve a 0.27um perturbation, I<br>assume you would want at least<br>lrefine_max = 8 # with max resolution 300./(16*(2**(8-1)) = 0.146 µm<br>then you would have to set<br>lrefine_min_init = 2 # i.e. 9.375 µm, as with a default value of 1<br>(=18.75µm) you are on the limit of detecting the foil at init time.<br><br>Besides, it is advised to have square simulations cells, that can be<br>achieved for a 300 um X 1200 um domain with<br>nblockx = 1<br>nblocky = 4<br><br>Best,<br>--<span class="Apple-converted-space"> </span><br>Roman Yurchak<br>PhD student<br>Laboratoire LULI<br>Ecole Polytechnique, France<br><br><br>On 15/09/14 23:49, Mario Manuel wrote:<br><blockquote type="cite">Hi,<br><br>I am trying to setup a simulation that looks at RT growth of seeded<br>perturbations on a laser-accelerated foil. The foil parameters I'd like<br>to implement is a 21um thick foil with a 0.27um sinusoidal amplitude<br>perturbation on it. I have altered the LaserSlab simulation initBlock to<br>do this and I can successfully create a 21um thick foil with a 2um<br>perturbation, but as I try to make the perturbation smaller, the foil<br>entirely disappears from the domain. I have tried to change the<br>lrefine_max parameter to get the resolution I need, but have been thus<br>far unsuccessful at getting down to the sub micron level that i need to<br>run the simulation. I also ran the ./setup with nxb=32 and nyb=32 to try<br>to get at the problem, but still to no avail.<br><br>The domain is rather large, 300 um X 1100 um, due to the fact that I<br>need to have some computational space given to the laser-plasma<br>interaction and to allow the foil to accelerate and move during the<br>simulation.<br><br>Any thoughts on how I could better implement my problem?<br><br>Cheers,<br>Mario<span class="Apple-converted-space"> </span><br><br>______________________________________<br><br><br>Dr. Mario Manuel<br>Einstein Postdoctoral Fellow, Smithsonian Astrophysical Observatory<br><a href="mailto:mmanuel@umich.edu">mmanuel@umich.edu</a><span class="Apple-converted-space"> </span><<a href="mailto:mmanuel@umich.edu">mailto:mmanuel@umich.edu</a>><br>617-899-8381<br><br>University of Michigan<br>Space Research Building<br>2455 Hayward Street<br>Ann Arbor, MI 48109<br>Office: 734-764-4585<br>______________________________________<br><br></blockquote><br><br>--<span class="Apple-converted-space"> </span><br>Roman</div></blockquote></div><br></body></html>