Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session Q49: Extreme-Scale Computational Science Discovery in Fluid Dynamics and Related Disciplines I
3:00 PM–6:00 PM,
Wednesday, March 16, 2022
Room: McCormick Place W-471B
Sponsoring
Units:
DCOMP DFD
Chair: P. K. Yeung, Georgia Tech
Abstract: Q49.00009 : Numerical simulation of the Richtmyer--Meshkov instability evolving from broadband initial perturbations
5:00 PM–5:12 PM
Presenter:
Michael Groom
(University of Sydney)
Authors:
Michael Groom
(University of Sydney)
Ben Thornber
(Univ of Sydney)
The ILES results are used to explore the behaviour of the layer in the high Reynolds number limit at late dimensionless times and demonstrate the persistent influence of initial conditions, as manifested in quantities such as the growth exponent of the mixing layer width θ and the mixing fraction Θ. Specifically, these are shown to depend on the spectral slope m of the initial condition during the period of self-similar growth, which in turn depends on the bandwidth of initial modes. Prior to the development of a turbulent mixing layer, DNS is required for accurate predictions of the transitional behaviour. Direct numerical simulations of the same initial conditions used in the ILES study are performed to illustrate the challenges associated with simultaneously trying to maximise the Reynolds number of the simulation, so that transition through to a fully developed turbulent state may be simulated, as well as trying to maximise the bandwidth of initial modes in order to be representative of the initial surface perturbations found in real flows. Some preliminary results from the simulations will be presented and possible extensions of the current work in order to achieve higher Reynolds numbers and bandwidths will also be discussed.
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