Bulletin of the American Physical Society
2005 APS March Meeting
Monday–Friday, March 21–25, 2005; Los Angeles, CA
Session J6: Extreme Computing |
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Sponsoring Units: DCOMP Chair: Thomas Schulthess, Oak Ridge National Laboratory Room: LACC 502A |
Tuesday, March 22, 2005 11:15AM - 11:51AM |
J6.00001: Scientific Discovery through Advanced Computing in Plasma Science Invited Speaker: Advanced computing is generally recognized to be an increasingly vital tool for accelerating progress in scientific research during the 21st Century. For example, the Department of Energy's ``Scientific Discovery through Advanced Computing'' (SciDAC) Program was motivated in large measure by the fact that formidable scientific challenges in its research portfolio could best be addressed by utilizing the combination of the rapid advances in super-computing technology together with the emergence of effective new algorithms and computational methodologies. The imperative is to translate such progress into corresponding increases in the performance of the scientific codes used to model complex physical systems such as those encountered in high temperature plasma research. If properly validated against experimental measurements and analytic benchmarks, these codes can provide reliable predictive capability for the behavior of a broad range of complex natural and engineered systems. This talk reviews recent progress and future directions for advanced simulations with some illustrative examples taken from the plasma science applications area. Significant recent progress has been made in both particle and fluid simulations of fine-scale turbulence and large-scale dynamics, giving increasingly good agreement between experimental observations and computational modeling. This was made possible by the combination of access to powerful new computational resources together with innovative advances in analytic and computational methods for developing reduced descriptions of physics phenomena spanning a huge range in time and space scales. In particular, the plasma science community has made excellent progress in developing advanced codes for which computer run-time and problem size scale well with the number of processors on massively parallel machines (MPP's). A good example is the effective usage of the full power of multi-teraflop (multi-trillion floating point computations per second) MPP's to produce three-dimensional, general geometry, nonlinear particle simulations which have accelerated progress in understanding the nature of plasma turbulence in magnetically-confined high temperature plasmas. These calculations, which typically utilized billions of particles for thousands of time-steps, would not have been possible without access to powerful present generation MPP computers and the associated diagnostic and visualization capabilities. In general, results from advanced simulations provide great encouragement for being able to include increasingly realistic dynamics to enable deeper physics insights into plasmas in both natural and laboratory environments. The associated scientific excitement should serve to stimulate improved cross-cutting collaborations with other fields and also to help attract bright young talent to the computational science area. [Preview Abstract] |
Tuesday, March 22, 2005 11:51AM - 12:27PM |
J6.00002: Exploring the Physics of Supernova Explosions Invited Speaker: There is a growing body of evidence that core-collapse supernova explosions are inherently asymmetric. The origin of this asymmetry may arise in the first few hundred milliseconds after core collapse, when the nascent shock wave is susceptible to the spherical accretion shock instability. As part of the Terascale Supernova Initiative, we are using large-scale three-dimensional simulations to investigate the role of hydrodynamic instabilities in core-collapse supernovae. We show that the collapse of a stationary, spherical star can, through the development of the SASI, produce an asymmetric explosion, leave behind a rapidly spinning neutron star, and impart a significant neutron star kick. [Preview Abstract] |
Tuesday, March 22, 2005 12:27PM - 1:03PM |
J6.00003: Prospects for an Earth system model to study global climate changein global climate modeling Invited Speaker: |
Tuesday, March 22, 2005 1:03PM - 1:39PM |
J6.00004: Does the 2D Hubbard model describe high-temperature superconductors? Invited Speaker: With more than a thousand publications yearly over the past ten years, the 2D Hubbard model has been widely used as a theoretical tool to investigate the physics of the high-temperature superconducting cuprates. Here we present the first numerically exact solution of the conventional 2D Hubbard model. We systematically study the cluster size dependence of superconductivity in the doped model using the dynamical cluster approximation and quantum Monte Carlo as a cluster solver. Due to the non-locality of the d-wave superconducting order parameter, the results on small clusters show large size and geometry effects. These become weaker as the cluster size increases and finite transition temperatures are found in large enough clusters. The extrapolation to infinite cluster size will be discussed. [Preview Abstract] |
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