Gas-kinetic simulation of sustained turbulence in minimal Couette flow

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Title: Gas-kinetic simulation of sustained turbulence in minimal Couette flow
Author(s): Papadakis, G
Gallis, M
Torczynski, JR
Bitter, NP
Koehler, TP
Plimpton, SJ
Item Type: Journal Article
Abstract: We provide a demonstration that gas-kinetic methods incorporating molecular chaos can simulate the sustained turbulence that occurs in wall-bounded turbulent shear flows. The direct simulation Monte Carlo method, a gas-kinetic molecular method that enforces molecular chaos for gas-molecule collisions, is used to simulate the minimal Couette flow at Re=500. The resulting law of the wall, the average wall shear stress, the average kinetic energy, and the continually regenerating coherent structures all agree closely with corresponding results from direct numerical simulation of the Navier-Stokes equations. These results indicate that molecular chaos for collisions in gas-kinetic methods does not prevent development of molecular-scale long-range correlations required to form hydrodynamic-scale turbulent coherent structures.
Publication Date: 26-Jul-2018
Date of Acceptance: 3-Jul-2018
ISSN: 2469-990X
Publisher: American Physical Society
Journal / Book Title: Physical Review Fluids
Volume: 3
Issue: 7
Copyright Statement: © 2018 American Physical Society.
Keywords: Science & Technology
Physical Sciences
Physics, Fluids & Plasmas
Publication Status: Published
Article Number: 071402
Online Publication Date: 2018-07-26
Appears in Collections:Faculty of Engineering

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