Speaker: Ross Heath Affiliation: University of Texas Title: A discontinuous Galerkin method for the approximation of collisionless plasmas Date: 31-Jul-2007, Tuesday Time: 11:30 Place: Lidow Complex, room 620 Remarks: Dr Heath is visiting until 13th August ABSTRACT: A discontinuous Galerkin method is presented for approximating the Vlasov-Poisson system of equations describing the time evolution of a collisionless plasma. The method is mass conservative and, in the case that piecewise constant functions are used as a basis, the method preserves the positivity of the distribution function. Numerical results are shown for the 2D phase space case, and are benchmarked against established theoretical results for the phenomenon of linear Landau damping for both Maxwellian and Lorentzian equilibrium distributions and against a variety of standard nonlinear damping problems. Additional Info: As you requested, I will try to focus special attention of the finite element method, in general, and the discontinuous Galerkin (DG) method, in particular, for PDE systems. Also, I will highlight how a code for the DG method can be parallelized in a straightforward manner. Also, for those interested students, I will be available after the talk to discuss any particular PDE systems they are interested in numerically approximating, and should be able to give them some references to help them get starting using the finite element method.
Workshop on Computations in Nanotechnology
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Affiliation: Sun Asia Pacific Science and Technology Center
Title: Road to Petascale - Sun Perspective
Date: 28-Jan-2007, Sunday
Place: Seminar Room B, Lidow Physics Building
(also known as Rm 300, its near the bridge to Taub Humanities)
Remarks: Coffee and cookies at 12:15 outside seminar Rm B
Dr Simon Chong-Wee See is the Director - Advanced Computing Solution, Global Systems Practice and Sun Asia Pacific Science and Technology Center (http://apstc.sun.com.sg) Global Science and Technology Network Sun Microsystems Inc.
|Speaker: Professor D. Stauffer|
Affiliation: University of Cologne
Title: Computer Simulation of Languages
Date: 31-Dec-2006, Sunday
Place: Lidow Complex, room 620
Remarks: Professor Stauffer is visiting HUJI and will be at the Technion for several hours, people wishing to meet with him should contact Joan Adler
Speaker: Professor David Landau Affiliation:Center for Simulational Physics, The University of Georgia, Athens, GA Title: Monte Carlo simulations of Bose-Einstein Condensation in a weakly interacting Bose gas*$ Date: 18-Dec-2006, Monday Time: 16:30 Place: Lidow Complex, room 502
The discovery of Bose-Einstein Condensation (BEC) in weakly interacting Bose gases has been one of the most anticipated and exciting experimental discoveries of the late 20th century. As a consequence, the physics of weakly interacting Bose gases has become the topic of great interest.Although these gases may be dilute, the effects of two-body interactions are important and exceedingly difficult to predict at finite temperature.In particular, the determination of the effect of repulsive interactions on the critical temperature of a homogeneous, weakly interacting Bose gas has had a controversial history. In this talk we shall describe finite-temperature path integral Monte Carlo (PIMC) simulations which have been used to examine the interaction-induced shift of the phase transition temperature for BEC of a homogeneous, weakly interacting Bose gas in three dimensions.In the dilute limit the strength of the inter-atomic interaction is characterized by the s-wave scattering length a, and confinement may be achieved by the imposition of external trapping potentials of varying magnitude and shTape. The PIMC method will first be described, and results for both non-interacting and interacting cases will then be presented. We will provide a resolution of the controversy in the density dependence of the BEC phase transition in the absence of a trap, and will then show results for traps of various shapes as well as for systems with large dipole moments for which dipole-dipole interactions must be included.* Research performed in collaboration with Kwangsik Nho
$ Research support by NASA
Professor Landau's visit is supported by the Lewiner Institute for Theoretical Physics
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