Numerical Simulations and Astrophysical Applications of Laboratory Jets at Omega |
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| Authors: | R F Coker B H Wilde J M Foster B E Blue P A Rosen R J R Williams P Hartigan A Frank C A Back |
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| Institution: | (1) AWE, Aldermaston, Reading, UK;(2) Los Alamos National Laboratory, Los Alamos, NM, USA;(3) Lawrence Livermore National Laboratory, Livermore, CA, USA;(4) Department of Physics and Astronomy, Rice University, Houston, TX, USA;(5) Department of Physics and Astronomy, University of Rochester, Rochester, NY, USA;(6) General Atomic, Inertial Fusion Group, San Diego, CA, USA |
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| Abstract: | We have conducted experiments on the Omega laser at the University of Rochester that have produced jets of supersonic Ti impacting
and being deflected by a ball of high density plastic. These mm-sized jets of dense plasma are highly complex, have large
Reynolds numbers, and, given sufficient time and shear, should produce a fully turbulent flow. The experiments are diagnosed
with a point-projection backlighter, resulting in a single image per shot. Simulations of the 3D hydrodynamics capture the
large-scale features of the experimental data fairly well while missing some of the smaller scale turbulent-like phenomena.
This is to be expected given the limited characterization of the targets as well as the finite resolution of the 3D simulations.
If Euler scaling holds, these experiments should model larger astrophysical jets in objects such as HH 110 where an outflow
can be seen colliding with a molecular cloud. However, Euler scaling demands that not only the isothermal internal Mach numbers
of the two systems be similar but also that any dissipative mechanisms, such as radiative cooling or viscous dissipation,
be of equal importance relative to each other. Similar equations of state are required as well. We discuss such issues in
the context of these experiments and simulations. |
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| Keywords: | Hydrodynamics ISM: Herbig-Haro objects ISM: Jets and outflows Methods: Laboratory |
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