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Thursday, October 16, 2008
3:00 PM - 4:00 PM
CNLS Conference Room (TA-3, Bldg 1690)

Colloquium

Simulating compressible turbulent mixing with PPM and a new multifluid tracking scheme, PPB

Paul Woodward
University of Minnesota

As part of a collaboration with the Crestone Project team at LANL, my Research team at the University of Minnesota has designed a new multifluid version of our PPM gas dynamics code. A new moment-conserving algorithm, PPB, for the 3-D advection of the multifluid mixing fraction is the key ingredient to this code for handling the behavior of interfaces destabilized by shear and/or acceleration. This advection technique will be described along with the special features that make the method handle sharp multifluid interfaces well. Results for shear instability and Rayleigh-Taylor instability problems will be presented. The method has been implemented on the Roadrunner machine, and it performed well on the single Connected Unit where it was tested in July. Applications on Cartesian grids for the entrainment of stably stratified fluid at the upper boundary of a convectively unstable region in the white-dwarf-like core of a two-solar-mass star will be discussed.

Host: Ben Bergen, CCS-2