{"id":3347,"date":"2023-08-14T13:37:17","date_gmt":"2023-08-14T18:37:17","guid":{"rendered":"https:\/\/wordpress.cels.anl.gov\/lans-seminars\/?post_type=tribe_events&#038;p=3347"},"modified":"2023-08-14T13:37:17","modified_gmt":"2023-08-14T18:37:17","slug":"lans-seminar-102","status":"publish","type":"tribe_events","link":"https:\/\/wordpress.cels.anl.gov\/lans-seminars\/event\/lans-seminar-102\/","title":{"rendered":"LANS Seminar"},"content":{"rendered":"<p><strong>Seminar Title<\/strong>: PDE-based methods for efficient multiscale gas dynamics simulations<\/p>\n<p><strong>Speaker<\/strong>: Raag Ramani, PhD student Applied Mathematics, UC Davis<\/p>\n<p><strong>Date\/Time<\/strong>: August 30, 2023\/10:30 AM-11:30 AM<br \/>\n<strong>Location<\/strong>:<em> See Meeting URL on the cels-seminars website which requires Argonne login.<\/em><\/p>\n<p><strong>Host<\/strong>: Hara Iakovidou<\/p>\n<hr \/>\n<p><strong>Description<\/strong>: We present a new numerical framework for simulating fluid flows in multiple space dimensions, and an associated set of algorithms that are (a) high-order accurate, (b) flexible and applicable to a variety of flow configurations, (c) highly efficient, running an order of magnitude faster than traditional solvers, and (d) simple to implement. Our methodology is founded upon a number of PDE-based modifications to the underlying compressible Euler system, including a nonlinear artificial viscosity stabilization technique, an asymptotic model for unstable contact discontinuities, and a smooth dynamic adaptive mesh redistribution procedure. We will show a number of adaptive simulations of well-known and difficult gas dynamics problems, including strong shocks and unstable contact discontinuities. With the ability for our algorithms to &#8221;zoom-in&#8221; on small-scale vortical structures, our algorithm is the first to provide a speed-up of low-resolution adaptive simulations over high-resolution uniform simulations of comparable quality for unstable Rayleigh-Taylor problems. This is joint work with Steve Shkoller at UC Davis.<\/p>\n<p><strong>Bio<\/strong>: Raag Ramani is a PhD student in the Applied Mathematics department at UC Davis. His research focuses on the development of numerical algorithms for simulating fluid flows, including high-resolution shock-capturing methods, adaptive meshing, multiscale modeling and simulation, vortex methods, and combustion &amp; complex physics.<\/p>\n<p><em>Please note that the meeting URL for this event can be seen on the cels-seminars website, which requires an Argonne login.<\/em><\/p>\n<p>See all upcoming talks at\u00a0<a href=\"https:\/\/www.anl.gov\/mcs\/lans-seminars\">https:\/\/www.anl.gov\/mcs\/lans-seminars<\/a><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Seminar Title: PDE-based methods for efficient multiscale gas dynamics simulations Speaker: Raag Ramani, PhD student Applied Mathematics, UC Davis Date\/Time: August 30, 2023\/10:30 AM-11:30 AM Location: See Meeting URL on the cels-seminars website which requires Argonne login. Host: Hara Iakovidou &hellip; <a href=\"https:\/\/wordpress.cels.anl.gov\/lans-seminars\/event\/lans-seminar-102\/\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":976,"featured_media":0,"template":"","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_tribe_events_status":"","_tribe_events_status_reason":"","footnotes":""},"tags":[],"tribe_events_cat":[2],"class_list":["post-3347","tribe_events","type-tribe_events","status-publish","hentry","tribe_events_cat-seminar","cat_seminar"],"acf":[],"_links":{"self":[{"href":"https:\/\/wordpress.cels.anl.gov\/lans-seminars\/wp-json\/wp\/v2\/tribe_events\/3347","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wordpress.cels.anl.gov\/lans-seminars\/wp-json\/wp\/v2\/tribe_events"}],"about":[{"href":"https:\/\/wordpress.cels.anl.gov\/lans-seminars\/wp-json\/wp\/v2\/types\/tribe_events"}],"author":[{"embeddable":true,"href":"https:\/\/wordpress.cels.anl.gov\/lans-seminars\/wp-json\/wp\/v2\/users\/976"}],"version-history":[{"count":2,"href":"https:\/\/wordpress.cels.anl.gov\/lans-seminars\/wp-json\/wp\/v2\/tribe_events\/3347\/revisions"}],"predecessor-version":[{"id":3350,"href":"https:\/\/wordpress.cels.anl.gov\/lans-seminars\/wp-json\/wp\/v2\/tribe_events\/3347\/revisions\/3350"}],"wp:attachment":[{"href":"https:\/\/wordpress.cels.anl.gov\/lans-seminars\/wp-json\/wp\/v2\/media?parent=3347"}],"wp:term":[{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wordpress.cels.anl.gov\/lans-seminars\/wp-json\/wp\/v2\/tags?post=3347"},{"taxonomy":"tribe_events_cat","embeddable":true,"href":"https:\/\/wordpress.cels.anl.gov\/lans-seminars\/wp-json\/wp\/v2\/tribe_events_cat?post=3347"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}