United States Geological Survey’s Use of Washburn University’s High-Performance Academic Computing Environment
Linda Pickett and Brian Kelly of the U.S. Geological Survey have recently used HiPACE for groundwater flow modeling of the Equus Beds aquifer near Wichita, Kansas with MODFLOW-2000, a version of the USGS modular 3D finite-difference ground-water flow model. MODFLOW-2000 generates model-calculated values for groundwater levels and streamflow for comparison to measured values, calculates the sensitivity of hydraulic head to changes in model input parameter values, and performs parameter estimation to adjust parameter values so the difference between observed and measured values are minimized. Although MODFLOW will run on any PC, the parallel processing structure of the HiPACE computing environment allowed faster computation during parameter sensitivity runs. If sensitivity estimation processes were implemented on a single processor, the sensitivity of hydraulic head would be calculated for each parameter for the entire grid sequentially. A sensitivity run for one parameter required over 8 hours to complete on a desktop PC. Sensitivities were calculated for as many as 90 parameters resulting in a potential run time of over 30 days. The parallelization of the program in the HiPACE computing environment allowed the calculations for each parameter to be completed on a separate processor, significantly reducing the clock-time needed for each time step.
11-10-2009 - Physics Department Faculty Member Brian Thomas's students using HiPACE for NASA grant computations
Brian Thomas is principle investigator on a 3-year, $500,000 grant entitled "Astrophysical Ionizing Photon Events and Primary Productivity of Earth's Oceans" which was recently awarded to WU in collaboration with the University of Kansas and the Smithsonian Environmental Research Center.
11-06-2009 - Physics Department Faculty Member Karen Camarda's Paper is the First Resulting From HiPACE
Dynamical Bar-Mode Instability in Differentially Rotating Magnetized Neutron Stars
Authors: Karen D. Camarda, Peter Anninos, P. Chris Fragile, Jose A. Font
(Submitted on 3 Nov 2009)
Abstract: This paper presents a numerical study over a wide parameter space of the likelihood of the dynamical bar-mode instability in differentially rotating magnetized neutron stars. The innovative aspect of this study is the incorporation of magnetic fields in such a context, which have thus far been neglected in the purely hydrodynamical simulations available in the literature. The investigation uses the Cosmos++ code which allows us to perform three dimensional simulations on a cylindrical grid at high resolution. A sample of Newtonian magneto-hydrodynamical simulations starting from a set of models previously analyzed by other authors without magnetic fields has been performed, providing estimates of the effects of magnetic fields on the dynamical bar-mode deformation of rotating neutron stars. Overall, our results suggest that the effect of magnetic fields are not likely to be very significant in realistic configurations. Only in the most extreme cases are the magnetic fields able to suppress growth of the bar mode.
12-26-2007 - New Project: Visualization of Magnetic Domains in the 3-D Ising Model
Follow the link above to see a page dedicated to this project.
12-12-2007 - HiPACE Creates Mandelbrot Set Images and Movies
Follow the link to see images and movies of the Mandelbrot Set.