Finite scale theory: Predicting nature’s shocks

Margolin, L. G.; Plesko, C. S.; Reisner, J. M.

doi:10.1016/j.wavemoti.2020.102647

Finite scale theory: Predicting nature’s shocks

Journal Article · Fri Aug 14 00:00:00 EDT 2020 · Wave Motion

DOI:https://doi.org/10.1016/j.wavemoti.2020.102647· OSTI ID:1657137

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Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

In this paper, we describe a continuum model that accurately reproduces the experimentally measured structure of physical shocks in a perfect gas. In this work, we begin by presenting a history of shock structure research, theoretical, experimental and numerical, to quantify the significant discrepancies between Navier–Stokes predictions and laboratory measurements. In our first main result, we discuss modifications that generalize the Chapman–Enskog approximation and lead to a new continuum model termed the Finite Scale Equations. In our second main result, we use this continuum model to calculate shock structure with results comparable in accuracy to numerical simulations based on the Boltzmann equation.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE; USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 1657137

Alternate ID(s):: OSTI ID: 1776423

Report Number(s):: LA-UR--20-22689

Journal Information:: Wave Motion, Journal Name: Wave Motion Vol. 98; ISSN 0165-2125

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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