Altmetric

A molecular dynamics simulation of the turbulent Couette minimal flow unit

Publication available at: https://arxiv.org/pdf/1508.01163
Title: A molecular dynamics simulation of the turbulent Couette minimal flow unit
Authors: Smith, ER
Item Type: Journal Article
Abstract: A molecular dynamics simulation of planar Couette flow is presented for the minimal channel in which turbulence structures can be sustained. Evolution over a single break- down and regeneration cycle is compared to computational fluid dynamics simula- tions. Qualitative similar structures are observed and turbulent statistics show excellent quantitative agreement. The molecular scale law of the wall is presented in which stick-slip molecular wall-fluid interactions replace the no-slip conditions. The impact of grid resolution is explored and the observed structures are seen to be dependent on averaging time and length scales. The kinetic energy spectra show that a range of scales are present in the molecular system and that spectral content is dependent on the grid resolution employed. The subgrid velocity of the molecules is studied using joint probability density functions, molecular trajectories, di ff usion, and Lagrangian statistics. The importance of sub-grid scales, relevance of the Kolmogorov lengthscale, and implications of molecular turbulence are discussed.
Issue Date: 13-Nov-2015
Date of Acceptance: 21-Oct-2015
URI: http://hdl.handle.net/10044/1/53644
DOI: https://dx.doi.org/10.1063/1.4935213
ISSN: 1070-6631
Publisher: AIP Publishing
Journal / Book Title: Physics of Fluids
Volume: 27
Issue: 11
Copyright Statement: © 2015 AIP Publishing LLC.
Sponsor/Funder: Engineering & Physical Science Research Council (E
Funder's Grant Number: EPSRC Fellowship Smith
Keywords: Science & Technology
Technology
Physical Sciences
Mechanics
Physics, Fluids & Plasmas
Physics
NEAR-WALL TURBULENCE
SELF-DIFFUSION
LIQUID
MICROSCALE
FLUIDS
TRANSPORT
SUBJECT
MOTION
SPACE
physics.flu-dyn
01 Mathematical Sciences
02 Physical Sciences
09 Engineering
Fluids & Plasmas
Publication Status: Published
Open Access location: https://arxiv.org/pdf/1508.01163
Article Number: ARTN 115105
Appears in Collections:Civil and Environmental Engineering



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Creative Commons