{"683097":{"#nid":"683097","#data":{"type":"news","title":"Pancaked Water Droplets Help Launch Europe\u2019s Fastest Supercomputer","body":[{"value":"\u003Cp\u003EJUPITER became the world\u2019s fourth fastest supercomputer when it debuted last month. Though housed in Germany at the J\u00fclich Supercomputing Centre (JSC), Georgia Tech played a supporting role in helping the system land on the latest\u0026nbsp;\u003Ca href=\u0022https:\/\/top500.org\/lists\/top500\/2025\/06\/\u0022\u003ETOP500 list\u003C\/a\u003E.\u003C\/p\u003E\u003Cp\u003EIn November 2024, JSC granted Assistant Professor Spencer Bryngelson exclusive access to the system through the JUPITER Research and Early Access Program (\u003Ca href=\u0022https:\/\/www.fz-juelich.de\/en\/ias\/jsc\/jupiter\/jureap\u0022\u003EJUREAP\u003C\/a\u003E).\u003C\/p\u003E\u003Cp\u003EBy preparing\u0026nbsp;\u003Ca href=\u0022https:\/\/www.fz-juelich.de\/en\/news\/archive\/press-release\/2025\/jupiter-supercomputer-propels-european-computing-power\u0022\u003EEurope\u2019s fastest supercomputer\u003C\/a\u003E for launch, the joint project yielded valuable simulation data on the effects of shock waves in medicine and transportation.\u003C\/p\u003E\u003Cp\u003E\u201cThe shock-droplet problem has been a hallmark test problem in fluid dynamics for some decades now. It is sufficiently challenging to study that it keeps me scientifically interested, though the results are manifestly important,\u201d Bryngelson said.\u0026nbsp;\u003C\/p\u003E\u003Cp\u003E\u201cUnderstanding the droplet behavior in some extreme regimes remains an open scientific problem of high engineering value.\u201d\u003C\/p\u003E\u003Cp\u003EThrough JUREAP, JSC engineers tested Bryngelson\u2019s Multi-Component Flow Code (\u003Ca href=\u0022https:\/\/mflowcode.github.io\/\u0022\u003EMFC\u003C\/a\u003E) on their computers. The project simulated how liquid droplets behave when struck by a large, high-velocity shock wave moving much faster than the speed of sound.\u003C\/p\u003E\u003Cp\u003ETests produced visualizations of droplets deforming into pancake shapes before ejecting vortex rings as they broke apart from the shock wave. The experiments measured the swirls of air flow formed behind the droplets, known as vorticity.\u003C\/p\u003E\u003Cp\u003EVorticity is one variable aerospace engineers consider when building aircraft designed to fly at supersonic and hypersonic speeds. Small droplets and vortices pose significant hazards for high-Mach vessels.\u003C\/p\u003E\u003Cp\u003EThese computer models reduce the risk and cost associated with physical test runs. By simulating extreme scenarios, the JUREAP project demonstrated a safer and more efficient way to evaluate aerospace systems.\u003C\/p\u003E\u003Cp\u003EThe human body is another fluid space where fast, high-energy flows can occur.\u003C\/p\u003E\u003Cp\u003ESimulations help medical researchers create less invasive shock wave treatments. This technology can be further applied for uses ranging from breaking up kidney stones to treating inflammation.\u0026nbsp;\u003C\/p\u003E\u003Cp\u003EMFC\u2019s versatility for large- and small-scale applications made it suitable for testing JUPITER in its early stages. The project\u2019s success even earned it a JUREAP certificate for scaling efficiency and node performance.\u003C\/p\u003E\u003Cp\u003E\u201cThe use of application codes to test supercomputers is common. We\u2019ve participated in similar programs for OLCF Frontier and LLNL El Capitan,\u201d said Bryngelson, a faculty member with Georgia Tech\u2019s School of Computational Science and Engineering.\u003C\/p\u003E\u003Cp\u003E\u201cEngineers at supercomputer sites usually find and sort most problems on their own. But deploying workloads characteristic of what the JUPITER will run in practice stresses it in new ways. In these instances, we usually end up identifying some failure modes.\u201d\u003C\/p\u003E\u003Cp\u003EThe JSC and Georgia Tech researchers named their joint project Exascale Multiphysics Flows (ExaMFlow).\u003C\/p\u003E\u003Cp\u003EExaMFlow helps keep JUPITER on pace to become Europe\u2019s first exascale supercomputer. This designation refers to any machine capable of computing one exaflop, or one quintillion (\u201c1\u201d followed by 18 zeros) calculations per second.\u0026nbsp;\u003C\/p\u003E\u003Cp\u003EAll three systems that rank ahead of JUPITER are exascale supercomputers. They are\u0026nbsp;\u003Ca href=\u0022https:\/\/asc.llnl.gov\/exascale\/el-capitan\u0022\u003EEl Capitan\u003C\/a\u003E at Lawrence Livermore National Laboratory,\u0026nbsp;\u003Ca href=\u0022https:\/\/www.olcf.ornl.gov\/frontier\/\u0022\u003EFrontier\u003C\/a\u003E at Oak Ridge National Laboratory, and\u0026nbsp;\u003Ca href=\u0022https:\/\/www.anl.gov\/aurora\u0022\u003EAurora\u003C\/a\u003E at Argonne National Laboratory.\u0026nbsp;\u003C\/p\u003E\u003Cp\u003EJUPITER calculates more than 60 billion operations per watt. This makes the supercomputer the most energy-efficient system among the top five.\u0026nbsp;\u003C\/p\u003E\u003Cp\u003EExaMFlow ran Bryngelson\u2019s software on JSC\u2019s\u0026nbsp;\u003Ca href=\u0022https:\/\/www.fz-juelich.de\/en\/ias\/jsc\/systems\/supercomputers\/juwels\u0022\u003EJUWELS Booster\u003C\/a\u003E and JUPITER Exascale Transition Instrument (\u003Ca href=\u0022https:\/\/www.fz-juelich.de\/en\/news\/archive\/press-release\/2024\/new-jupiter-module-strengthens-leading-position-of-europe2019s-upcoming-exascale-supercomputer\u0022\u003EJETI\u003C\/a\u003E). The two modules form the backbone of JUPITER\u2019s full design.\u003C\/p\u003E\u003Cp\u003EExaMFlow\u2019s report showed that MFC performed with near-ideal scaling behavior on JUWELS and JETI compared to similar systems based on NVIDIA A100 GPUs.\u003C\/p\u003E\u003Cp\u003EAccess to NVIDIA hardware at Georgia Tech played a key role in ExaMFlow\u2019s success.\u003C\/p\u003E\u003Cp\u003EThe Institute hosts the\u0026nbsp;\u003Ca href=\u0022https:\/\/pace.gatech.edu\/phoenix-cluster\/\u0022\u003EPhoenix Research Computing Cluster\u003C\/a\u003E, which includes A100 GPUs among its arsenal of components. Bryngelson\u2019s lab owns NVIDIA A100 GPUs and four\u0026nbsp;\u003Ca href=\u0022https:\/\/www.cc.gatech.edu\/news\/researchers-blazing-new-trails-superchip-named-after-computing-pioneer\u0022\u003EGH200 Grace Hopper Superchips\u003C\/a\u003E.\u0026nbsp;\u003C\/p\u003E\u003Cp\u003ESince JUPITER is equipped with around 24,000 Grace Hopper Superchips, Bryngelson\u2019s work with the hardware proved especially insightful for the ExaMFlow project.\u0026nbsp; \u0026nbsp;\u003C\/p\u003E\u003Cp\u003E\u201cThe Grace Hopper chip is interesting. It\u2019s not challenging to use like a regular GPU device when one is familiar with running NVIDIA hardware. The more fun part is using its tightly coupled CPU to GPU interconnect to make use of the CPU as well,\u201d Bryngelson said.\u0026nbsp;\u003C\/p\u003E\u003Cp\u003E\u201cIt\u2019s not immediately obvious how to best do this, though we used a few tricks to tune its use to our application. They appear to work nicely.\u201d\u003C\/p\u003E\u003Cp\u003EJSC researchers \u003Cstrong\u003ELuis Cifuentes\u003C\/strong\u003E, \u003Cstrong\u003ERakesh Sarma\u003C\/strong\u003E, \u003Cstrong\u003ESeong Koh\u003C\/strong\u003E, and \u003Cstrong\u003ESohel Herff\u003C\/strong\u003E played important roles in running Bryngelson\u2019s MFC software on early JUPITER modules.\u0026nbsp;\u003C\/p\u003E\u003Cp\u003EThe ExaMFlow team included NVIDIA scientists \u003Cstrong\u003ENikolaos Tselepidis\u003C\/strong\u003E and \u003Cstrong\u003EBenedikt Dorschner\u003C\/strong\u003E.\u0026nbsp;\u003C\/p\u003E\u003Cp\u003EThe pair observed their company\u2019s hardware used in the field. They return to NVIDIA with notes that help the corporation build the next devices tailored to the need of scientific computing researchers.\u0026nbsp;\u003C\/p\u003E\u003Cp\u003E\u201cWe try to be prepared for the latest, biggest computers. Being able to take immediate advantage of the largest systems is a valuable capability,\u201d Bryngelson said.\u0026nbsp;\u003C\/p\u003E\u003Cp\u003E\u201cWhen the early access systems arrive, it\u2019s a great opportunity for the teams involved to test the machines, demonstrate and tune scientific software, and meet very capable new collaborators.\u201d\u003C\/p\u003E","summary":"","format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"\u003Cp\u003EJUPITER became the world\u2019s fourth fastest supercomputer when it debuted last month. Though housed in Germany at the J\u00fclich Supercomputing Centre (JSC), Georgia Tech played a supporting role in helping the system land on the latest\u0026nbsp;\u003Ca href=\u0022https:\/\/top500.org\/lists\/top500\/2025\/06\/\u0022\u003ETOP500 list\u003C\/a\u003E.\u003C\/p\u003E\u003Cp\u003EIn November 2024, JSC granted Assistant Professor Spencer Bryngelson exclusive access to the system through the JUPITER Research and Early Access Program (\u003Ca href=\u0022https:\/\/www.fz-juelich.de\/en\/ias\/jsc\/jupiter\/jureap\u0022\u003EJUREAP\u003C\/a\u003E).\u003C\/p\u003E\u003Cp\u003EBy preparing\u0026nbsp;\u003Ca href=\u0022https:\/\/www.fz-juelich.de\/en\/news\/archive\/press-release\/2025\/jupiter-supercomputer-propels-european-computing-power\u0022\u003EEurope\u2019s fastest supercomputer\u003C\/a\u003E for launch, the joint project yielded valuable simulation data on the effects of shock waves in medicine and transportation.\u003C\/p\u003E","format":"limited_html"}],"field_summary_sentence":[{"value":"Assistant Professor Spencer Bryngelson participated in the JUPITER Research and Early Access Program, which innovated his fluid dynamics software while stress testing Europe\u0027s fastest supercomputer in preparation for launch."}],"uid":"36319","created_gmt":"2025-07-11 13:05:43","changed_gmt":"2025-07-11 13:14:02","author":"Bryant Wine","boilerplate_text":"","field_publication":"","field_article_url":"","location":"Atlanta, GA","dateline":{"date":"2025-07-11T00:00:00-04:00","iso_date":"2025-07-11T00:00:00-04:00","tz":"America\/New_York"},"extras":[],"hg_media":{"677392":{"id":"677392","type":"image","title":"SHB-Pancaked-Droplet.png","body":null,"created":"1752239195","gmt_created":"2025-07-11 13:06:35","changed":"1752239195","gmt_changed":"2025-07-11 13:06:35","alt":"ExaMFlow 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Booster","file":{"fid":"261288","name":"JUPITER-Booster.jpeg","image_path":"\/sites\/default\/files\/2025\/07\/11\/JUPITER-Booster.jpeg","image_full_path":"http:\/\/hg.gatech.edu\/\/sites\/default\/files\/2025\/07\/11\/JUPITER-Booster.jpeg","mime":"image\/jpeg","size":61966,"path_740":"http:\/\/hg.gatech.edu\/sites\/default\/files\/styles\/740xx_scale\/public\/2025\/07\/11\/JUPITER-Booster.jpeg?itok=yY-RRh5o"}},"677394":{"id":"677394","type":"image","title":"SHB.jpeg","body":null,"created":"1752239292","gmt_created":"2025-07-11 13:08:12","changed":"1752239292","gmt_changed":"2025-07-11 13:08:12","alt":"Spencer Bryngelson","file":{"fid":"261289","name":"SHB.jpeg","image_path":"\/sites\/default\/files\/2025\/07\/11\/SHB.jpeg","image_full_path":"http:\/\/hg.gatech.edu\/\/sites\/default\/files\/2025\/07\/11\/SHB.jpeg","mime":"image\/jpeg","size":97248,"path_740":"http:\/\/hg.gatech.edu\/sites\/default\/files\/styles\/740xx_scale\/public\/2025\/07\/11\/SHB.jpeg?itok=FCxuiSy2"}}},"media_ids":["677392","677393","677394"],"related_links":[{"url":"https:\/\/www.cc.gatech.edu\/news\/pancaked-water-droplets-help-launch-europes-fastest-supercomputer","title":"Pancaked Water Droplets Help Launch Europe\u2019s Fastest Supercomputer"}],"groups":[{"id":"47223","name":"College of Computing"},{"id":"1188","name":"Research Horizons"},{"id":"50877","name":"School of Computational Science and Engineering"}],"categories":[{"id":"136","name":"Aerospace"},{"id":"138","name":"Biotechnology, Health, Bioengineering, Genetics"},{"id":"153","name":"Computer Science\/Information Technology and Security"},{"id":"135","name":"Research"}],"keywords":[{"id":"654","name":"College of Computing"},{"id":"166983","name":"School of Computational Science and Engineering"},{"id":"9153","name":"Research Horizons"},{"id":"187915","name":"go-researchnews"},{"id":"10199","name":"Daily Digest"},{"id":"181991","name":"Georgia Tech News Center"},{"id":"15030","name":"high-performance computing"},{"id":"168929","name":"supercomputers"}],"core_research_areas":[{"id":"39431","name":"Data Engineering and Science"}],"news_room_topics":[],"event_categories":[],"invited_audience":[],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[{"value":"\u003Cp\u003EBryant Wine, Communications Officer\u003Cbr\u003E\u003Ca href=\u0022mailto:bryant.wine@cc.gatech.edu\u0022\u003Ebryant.wine@cc.gatech.edu\u003C\/a\u003E\u003C\/p\u003E","format":"limited_html"}],"email":[],"slides":[],"orientation":[],"userdata":""}}}