Jeffrey A. Greenough

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The last 20 years have seen a wide variety of high-resolution methods that can compute sharp, oscillation-free compressible flows. Here, we combine a complementary set of these methods together in a nonlinear (hybridized) fashion. Our base method is built on a monotone high-resolution Godunov method, the piece-wise parabolic method (PPM). PPM is combined(More)
Blue Gene/L represents a new way to build supercomputers, using a large number of low power processors, together with multiple integrated interconnection networks. Whether real applications can scale to tens of thousands of processors (on a machine like Blue Gene/L) has been an open question. In this paper, we describe early experience with several physics(More)
DOI: 10.1177/1094342007085025 2008; 22; 33 International Journal of High Performance Computing Applications and Ümit Çatalyürek Chow McLendon, Bruce Hendrickson, Franz Franchetti, Stefan Kral, Jürgen Lorenz, Christoph W. Überhuber, Edmond Gygi, Timothy C. Germann, Kai Kadau, Peter S. Lomdahl, Charles Rendleman, Michael L. Welcome, William Alan Gara, John A.(More)
We use molecular dynamics (MD) to simulate diffusion in molten aluminum-copper (AlCu) alloys. The self-diffusivities and Maxwell-Stefan diffusivities are calculated for AlCu mixtures using the Green-Kubo formulas at temperatures from 1000 to 4000 K and pressures from 0 to 25 GPa, along with additional points at higher temperatures and pressures. The(More)
\Ve present a numerical method for solving the multifluid equations of gas dynamics using an operator-split second-order Godunoy method for flow in complex geometries in t'\\'O and three dimensions, The multifluid system treats the fluid components as thermodynamically distinct entities and correctly models fluids with different compressibilities, This(More)
The interaction of a small-wavelength multimodal perturbation with a large-wavelength inclined interface perturbation is investigated for the reshocked Richtmyer-Meshkov instability using three-dimensional simulations. The ares code, developed at Lawrence Livermore National Laboratory, was used for these simulations and a detailed comparison of simulation(More)
A computational study of the Richtmyer-Meshkov instability for an inclined interface is presented. The study covers experiments to be performed in the Texas A&M University inclined shock tube facility. Incident shock wave Mach numbers from 1.2 to 2.5, inclination angles from 30° to 60°, and gas pair Atwood numbers of ∼0.67 and ∼0.95 are used in this(More)
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