<html><body><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt; color: #000000"><div>Hi everyone,</div><div>I''ve been working on 2D FLASH simulations in cartesian geometry with a laser. </div><div><br data-mce-bogus="1"></div><div><div><img src="cid:00bd692cd30dfe70aca5fe84fe27bacdb59af5cb@zimbra" data-mce-src="cid:00bd692cd30dfe70aca5fe84fe27bacdb59af5cb@zimbra" width="169" height="212"></div></div><div>On this density map in logarithm scale, a laser hits a modulated target (see the modulation at ~0.030cm) from the bottom at normal incidence. </div><div>During the laser irradiation, the target is ablated and ejected through the pseudo vaccum (see the white frame). </div><div><br data-mce-bogus="1"></div><div>My question is: How could I tell FLASH to not refine the region framed?<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>I noticed in the user guide and previous e-mails by the FLASH community that it exists AMR options such as "<!--StartFragment-->refine_cutoff<!--EndFragment--> " or "<!--StartFragment-->derefine_cutoff<!--EndFragment--> " which I think could solve my issue.<br data-mce-bogus="1"></div><div>I tried to play with it but I haven't see any effects on the refinement.<br data-mce-bogus="1"></div><div>For my case, the density gradients in the white frame are big enough to be identify by the AMR. </div><div>However, the absolute density is quiet low so I guess I could use these informations to tell FLASH that under a certain value in density it should forget what are the gradients and not trigger the AMR refinement.<br data-mce-bogus="1"></div><div><br data-mce-bogus="1"></div><div>if <em>refine_var_1 = "dens"</em>, I tried <!--StartFragment--><em>refine_cutoff_1 =1e-5</em> to blunder the AMR for densities below <!--StartFragment-->1e-5<!--EndFragment--> g/cc but I haven't noticed any consequences.<!--EndFragment--> </div><div><br data-mce-bogus="1"></div><div>If you have any idea about how tune the AMR option to solve this kind of issue, let me know!<br></div><div><br data-mce-bogus="1"></div><div>Have a great week-end</div><div><br data-mce-bogus="1"></div><div data-marker="__SIG_POST__">--</div><div><div style="text-align: left;" data-mce-style="text-align: left;"><span style="color: #000000;" data-mce-style="color: #000000;">Thibault Goudal</span></div><div style="text-align: left;" data-mce-style="text-align: left;"><span style="color: #000000;" data-mce-style="color: #000000;">PhD Student CEA</span></div><div style="text-align: left;" data-mce-style="text-align: left;"><span style="color: #000000;" data-mce-style="color: #000000;">CELIA CNRS UMR5107 laboratory</span></div><div style="text-align: left;" data-mce-style="text-align: left;"><span style="color: #000000;" data-mce-style="color: #000000;">+33664160842</span></div><div style="text-align: left;" data-mce-style="text-align: left;"><span style="color: #000000;" data-mce-style="color: #000000;">thibault.goudal@u-bordeaux.fr<br></span></div></div></div></body></html>