Construction of a statistical model for compressible Kelvin Helmholz instability using numerical simulations and experiments

by Assaf Shimony

at Astrophysics and Cosmology Seminar

Wed, 25 May 2016, 11:15
Physics building (#54) room 207

Abstract

The Kelvin Helmholtz KH instability evolves between two fluid regions subjected to a velocity jump at the interface Small initial perturbations located on the shear layer grow in the form of vortices forming a mixing zone The KH instability affects a variety of astrophysical systems including jets and supernovas Motivating by the statistical model for the incompressible case we present an extended model for the general compressible case which separates the problem to two building elements: the evolution of a single vortex and the merger rate of two vortices We study numerically and theoretically the compressibility effects on these two elements and the resultant multi mode mixing zone width known experimentally to have inhibited growth rate Design and analysis of experiments on a high energy density physics platform in the compressible regime indicating a growth rate reduction will be shown and discussed

Created on 24-05-2016 by Bar Lev, Yevgeny (ybarlev)
Updaded on 24-05-2016 by Bar Lev, Yevgeny (ybarlev)