Astrophysics

At the heart of some of the smallest and densest stars in the universe lies nuclear matter that might exist in never-before-observed exotic phases. Neutron stars, which form when the …
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Five years ago this month, the Laser Interferometer Gravitational-wave Observatory, or LIGO, made its first detection of gravitational waves, marking a historic event in the astrophysics community. Since then, LIGO …
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Bronson Messer—a computational astrophysicist, Distinguished Scientist in the Scientific Computing and Theoretical Physics groups at the US Department of Energy’s (DOE’s) Oak Ridge National Laboratory (ORNL), and a former Jeopardy! …
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As GPU architectures have become the standard for scientific computing, application teams have had to retrofit their scientific codes to run on new systems. Even teams with codes that have …
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Titan, the groundbreaking Cray XK7 supercomputer operated by the Oak Ridge Leadership Computing Facility (OLCF) at the US Department of Energy’s (DOE’s) Oak Ridge National Laboratory (ORNL), was officially decommissioned …
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Using the Titan supercomputer at the US Department of Energy’s Oak Ridge National Laboratory, a team of astrophysicists created a set of galactic wind simulations of the highest resolution ever …
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Will Fox, a research scientist at the US Department of Energy’s (DOE’s) Princeton Plasma Physics Laboratory (PPPL) and long-time user of the Oak Ridge Leadership Computing Facility (OLCF), has received …
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Frontier is an exascale computer planned for delivery at the Oak Ridge Leadership Computing Facility in 2021. The system will support a wide range of scientific applications for advanced modeling …
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Bronson Messer, a computational scientist at the Oak Ridge Leadership Computing Facility (OLCF), gave an invited talk at the American Physical Society’s (APS’s) “Quarks to the Cosmos” April meeting in …
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In 2017, the Oak Ridge Leadership Computing Facility celebrated 25 years of leadership in high-performance computing. This article is part of a series summarizing a dozen significant contributions to science …
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In 2017, the Oak Ridge Leadership Computing Facility celebrated 25 years of leadership in high-performance computing. This article is part of a series summarizing a dozen significant contributions to science …
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A team at the Oak Ridge Leadership Computing Facility recently addressed a performance bottleneck in one portion of an OLCF user’s application. Because of its efforts, the user’s team saw a sixfold performance improvement in the code.
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When Mike Warren was a graduate student 20 years ago, computational astrophysicists were conducting simulations of the universe’s structure with a million particles representing large masses of matter like galaxy …
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A multi-institution team has been using Titan to create the largest fully-coupled simulation of the universe’s Epoch of Reionization.
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Using Titan, researchers at Stony Brook University completed a three-dimensional, high-resolution investigation of the thermonuclear burning a double-detonation white dwarf undergoes before explosion.
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For 5 years a team led by William Daughton of Los Alamos National Laboratory has been simulating magnetic reconnection in space using the Cray XK7 Titan supercomputer and its predecessor, the Cray XT5 Jaguar supercomputer. The team’s simulations support the National Aeronautics and Space Administration’s Magnetospheric Multiscale Mission.
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