{"52515":{"#nid":"52515","#data":{"type":"event","title":"CSE Lecture: Accurate, Stable, and Scalable Algorithms for Convection-Dominated Flows (Paul Fischer)","body":[{"value":"\u003Cp\u003EPaul Fischer\u003C\/p\u003E\n\u003Cp\u003EMathematics and Computer Science Division Argonne National Laboratory\u003C\/p\u003E\n\u003Cp\u003E\n\u003C\/p\u003E\n\u003Cp\u003EFor more information please contact Dr. George Biros\u00a0 at \u003Ca href=\u0022mailto:biros@gatech.edu\u0022\u003Ebiros@gatech.edu\u003C\/a\u003E\u003C\/p\u003E\n\u003Cp class=\u0022MsoPlainText\u0022\u003E\u003C\/p\u003E\n\u003Cp\u003E\u0022Accurate, Stable, and Scalable Algorithms for Convection-Dominated Flows\u0022\n\u003C\/p\u003E\n\u003Cp class=\u0022MsoPlainText\u0022\u003E\u003C\/p\u003E\n\u003Cp class=\u0022MsoPlainText\u0022\u003EAbstract:\u003C\/p\u003E\n\u003Cp class=\u0022MsoPlainText\u0022\u003EAccuracy and stability have long been essential pillars of numerical algorithms for the simulation of fluid flow.\u00a0 With the advent of tera- and petascale parallel computers comprising thousands and hundreds of thousands of processors, scalability is emergent as another essential pillar.\u00a0 To first order, scalability implies that the solution time be only weakly dependent on the number of processors P, with n\/P fixed, where n is the number of degrees of freedom in the problem.\u00a0 Time-dependent transport problems having minimal dissipation, such as electromagnetics and convection-dominated flow, face an additional scalability challenge, namely, that dispersion errors accumulated at small scales may become dominant when propagated through the large domains that are afforded by petaflops computers.\u003C\/p\u003E\n\u003Cp class=\u0022MsoPlainText\u0022\u003EThis talk will cover several critical developments that make it possible to use spectral element simulations in large-scale convection-dominated incompressible flow simulations on tens and hundreds of thousands of processors.\u00a0 Discretization advances that have made the spectral element viable for these problems include stabilizing filters and spectral element dealiasing.\u00a0 Solver advances include spectral element multigrid methods that employ robust Schwarz-based smoothers and scalable parallel coarse-grid solvers.\u00a0 In addition to these fundamental elements, we touch upon a few technical details required to exceed processor counts of ten thousand.\u00a0 We present the results of several spectral element simulations, including heat transfer in reactor core subchannels, turbulent MHD,\u00a0 and a detailed discussion of transitional flow in arteriovenous grafts.\u00a0 We conclude with some perspectives on the future of high-order methods and high performance computing applied to computational fluid dynamics.\u003C\/p\u003E\n\u003Cp class=\u0022MsoPlainText\u0022\u003E\u003C\/p\u003E\n\u003Cp class=\u0022MsoPlainText\u0022\u003E\u003Ca href=\u0022http:\/\/www.mcs.anl.gov\/~fischer\/\u0022\u003Ehttp:\/\/www.mcs.anl.gov\/~fischer\/\u003C\/a\u003E\u003C\/p\u003E\n\u003Cp class=\u0022MsoPlainText\u0022\u003E~~~~~~~~~~~~~~~~~~\u003C\/p\u003E\n\u003Cp class=\u0022MsoPlainText\u0022\u003EYou are cordially invited to attend a reception that will follow the seminar to chat informally with faculty and students. Refreshments will be provided.\u003C\/p\u003E\n\u003Cp class=\u0022MsoPlainText\u0022\u003E\u003C\/p\u003E\n\u003Cp class=\u0022MsoPlainText\u0022\u003ETo receive future announcements, please sign up to the cse-seminar email list:\u003C\/p\u003E\n\u003Cp class=\u0022MsoPlainText\u0022\u003E\u003Ca href=\u0022https:\/\/mailman.cc.gatech.edu\/mailman\/listinfo\/cse-seminar\u0022\u003Ehttps:\/\/mailman.cc.gatech.edu\/mailman\/listinfo\/cse-seminar\u003C\/a\u003E\u003C\/p\u003E\n\u003Cp\u003E\u003C\/p\u003E\n\u003Cp\u003E\u003C\/p\u003E","summary":null,"format":"limited_html"}],"field_subtitle":"","field_summary":"","field_summary_sentence":"","uid":"27154","created_gmt":"2010-02-11 15:51:49","changed_gmt":"2016-10-08 01:49:49","author":"Louise Russo","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2009-05-08T15:00:00-04:00","event_time_end":"2009-05-08T16:00:00-04:00","event_time_end_last":"2009-05-08T16:00:00-04:00","gmt_time_start":"2009-05-08 19:00:00","gmt_time_end":"2009-05-08 20:00:00","gmt_time_end_last":"2009-05-08 20:00:00","rrule":null,"timezone":"America\/New_York"},"extras":[],"groups":[{"id":"47223","name":"College of Computing"}],"categories":[],"keywords":[],"core_research_areas":[],"news_room_topics":[],"event_categories":[],"invited_audience":[],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[{"value":"Lometa Mitchell","format":"limited_html"}],"email":[],"slides":[],"orientation":[],"userdata":""}}}