On the cover: A research team led by PrincetonUniversity is using the ALCF's Theta supercomputer to perform large-scale 3D simulations aimed at determining the mechanism of core-collapse supernova explosions. Depicted is the neutrino-driven roiling convection of the nuclear material behind the newly reenergized supernova shock wave that surrounds the newly birthed neutron star, just hundreds of milliseconds after shock revival. The isosurfaces are of specific entropy and the coloring follows the electron fraction. The pathlines trace infalling parcels of matter caught up in the turbulence of the explosion. The neutrino-heated turbulent bubbles help drive the supernova explosion shock wave outwards.
On the cover A snapshot of an expanding detonation wave from a visualization that depicts weak ignition behind a reflected shock in a 2H 2 +O 2 mixture at initially atmospheric pressure..
The experimental new media group -Nomads & Homesteaders explore biotechnology, artificial life systems and simulation through, the Open Source Life (OSL) project.
On the cover Collapse of spherical cloud with 50,000 bubbles. The generation of microjets directed toward the cloud center causes the formation of cap-like bubble shapes.
program, the ALCF is one half of the DOE Leadership Computing Facility, which deploys two diverse highperformance computer architectures dedicated to open science. Available to researchers from universities, industry, and government agencies, the ALCF helps accelerate the pace of discovery and innovation by providing supercomputing resources that are 10 to 100 times more powerful than systems typically available for open scientific research. Through substantial awards of supercomputing time and user support services, the ALCF enables largescale modeling and simulation research aimed at solving some of the world's largest and most complex problems in science and engineering.
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