Bulletin of the American Physical Society
APS April Meeting 2022
Volume 67, Number 6
Saturday–Tuesday, April 9–12, 2022; New York
Session T05: Frontiers in Computational Stellar AstrophysicsInvited Session Live Streamed
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Sponsoring Units: DCOMP DAP Chair: Michael Zingale, Stony Brook University (SUNY) Room: Astor |
Monday, April 11, 2022 3:45PM - 4:21PM |
T05.00001: Core-Collapse Supernova Simulation at the Dawn of the Exascale Era Invited Speaker: Bronson Messer The study of core-collapse supernovae touches on a variety of questions including the origin of the chemical elements, the formation of neutron stars and black holes, the generation of gravitational waves, and the dynamics of the interstellar medium. Computational models of these events are inherently multiscale and multiphysics and have required increasing amounts of computational power as our understanding has matured. Chief among these multiphysics concerns are neutrino weak interactions with the stellar material, the theory of which is still evolving. These interactions are flavor and energy dependent and are notoriously feeble, leading to a need to employ numerically expensive kinetic representations to capture the transport of energy and lepton number. Nevertheless, significant advances in our understanding of core-collapse supernovae have been enabled by petascale computing, and many investigations now agree on the general outlines of the mechanism. I will describe some current projects, including efforts to build a new application code capable of taking advantage of exascale platforms to enable the study of a wide range of progenitor stars via simulations of adequate physical fidelity in tractable runtimes. |
Monday, April 11, 2022 4:21PM - 4:57PM |
T05.00002: Accelerated Computing and its Implications for Computational Astrophysics Invited Speaker: Max Katz In the paradigm of accelerated computing, CPUs, GPUs, and NICs have to be used together to solve computational problems. The density of compute power on a modern server node means that developers must think carefully about how to program their applications so that they do not hit strong scaling limits too early. Additionally, the complexity and diversity of the hardware available on HPC clusters means that there are a number of approachers developers can take to write code that works on today's and tomorrow's clusters. In this presentation I will discuss what some developers have been doing in computational astrophysics and related fields to achieve performance portability (or something approximating it), and what might be different in the future to make it easier. I will specifically discuss what needs to change about code originally written for CPUs when it is adapted for today's heterogeneous systems. Although these changes can be time-consuming and challenge some favored software paradigms (and, in some cases, even some favored programming languages), I will argue that the benefits of this adaptation are clearly worth it. |
Monday, April 11, 2022 4:57PM - 5:33PM |
T05.00003: The Challenge of Simulating Slow Flows in Stellar Astrophysics Invited Speaker: Philipp Edelmann Stars spend most of their lives in rather quiescent phases dominated by slow fluid flow, be it low Mach number convection or wave-like motions. Yet accurately modeling these phases is of great importance for understanding mixing in stars, the resulting impact on nucleosynthesis, and the rich data coming from asteroseismology. This influences the ultimate fate of the star and, in turn, galactic chemical evolution. |
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