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4 - Multimode instabilities: Linear and nonlinear regimes

from Part 1 - Fundamentals

Ye Zhou
Affiliation:
Lawrence Livermore National Laboratory, California
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Summary

The multi-mode instability is the simultaneous growth across many wavelengths. This is closer to the reality of many applications. We provide a detailed treatment of the various stages of development. It is widely believed that many turbulent flows, such as RTI, RMI, and KHI mixing layers, evolve toward self-similarity. Here, the RTI grows quadratically with time, and the suitable proportionality constant is the subject of ongoing research. The growth exponent for RMI is also the subject of ongoing research. I also discuss measurements of these parameters in experiments and simulations arising from multimodal initial perturbations.

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Chapter
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Hydrodynamic Instabilities and Turbulence
Rayleigh–Taylor, Richtmyer–Meshkov, and Kelvin–Helmholtz Mixing
, pp. 66 - 90
Publisher: Cambridge University Press
Print publication year: 2024

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