Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session X36: Flow Instability: Richtmyer-Meshkov
8:00 AM–10:36 AM,
Tuesday, November 21, 2023
Room: 202B
Chair: Praveen Ramaprabhu, University of North Carolina at Charlotte
Abstract: X36.00005 : Simulations and models to describe initial condition effects on the multi-mode Richtmyer-Meshkov instability
8:52 AM–9:05 AM
Presenter:
Guy Dimonte
(Los Alamos National Laboratory)
Authors:
Guy Dimonte
(Los Alamos National Laboratory)
Praveen K Ramaprabhu
(University of North Carolina at Charlotte)
Madhav Nagori
(University of North Carolina at Charlotte)
Ismael Boureima
(Los Alamos National Laboratory)
The Richtmyer-Meshkov instability (RMI) is shock driven and affects many phenomena from inertial confinement fusion to supernova explosions. The behavior of single-modes in the RMI has been studied expensively but less is known with broadband perturbations that occur in applications. Here, we describe extensive numerical simulations and modeling of the RMI with broadband perturbations with a wavenumber (k) power spectrum of the form P ∝ km. The bubble amplitude hB is found to grow in two stages. First, there is secular growth in time at a rate consistent with linear theory. Second, when hB becomes comparable to the average wavelength 2π/〈k〉 of the spectrum, it grows as a power law in time hB ~ tθ. This behavior is described and modeled over a wide range of m, spectral width, initial amplitudes and time.
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