Regimes of the Vishniac–Ryu Decelerating Shock Instability

Drake, R. Paul; Doss, Forrest William

doi:10.3847/1538-4357/aae47d

Title: Regimes of the Vishniac–Ryu Decelerating Shock Instability

Journal Article · 14 November 2018 · The Astrophysical Journal (Online)

DOI: https://doi.org/10.3847/1538-4357/aae47d · OSTI ID:1484645

^[1];

^[2]

Univ. of Michigan, Ann Arbor, MI (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

In this work, we revisit the derivation of the instability of dense shocked layers, originally developed by Vishniac and Ryu. Our motivation is that density profiles found in actual astrophysical and laboratory systems often do not match the assumptions in that paper. In order to identify the anticipated theoretical growth rates for various circumstances, one must first revisit the derivation and allow for the possibility that the density scale length differs, in magnitude and/or in sign, from the isothermal scale height. This analysis leads us to find regimes of purely convective instability and also of Vishniac stabilization of this instability, in addition to some new regimes of Vishniac behavior. We also identify a typographical error in the original paper that matters for quantitative evaluation of growth rates.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Univ. of Michigan, Ann Arbor, MI (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP); USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: 89233218CNA000001; NA0002956; NA0001944; AC52-06NA25396

OSTI ID:: 1484645

Alternate ID(s):: OSTI ID: 1486978

Report Number(s):: LA-UR-18-24184

Journal Information:: The Astrophysical Journal (Online), Vol. 868, Issue 1; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 4 works

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