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Turbulence dissipation and the role of coherent structures in the near wake of a square prism

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Title: Turbulence dissipation and the role of coherent structures in the near wake of a square prism
Authors: Alves Portela, F
Papadakis, G
Vassilicos, JC
Item Type: Journal Article
Abstract: Between streamwise distances 4d and at least 10d in the planar turbulent wake of a square prism of side length d, the turbulent fluctuating velocities are highly non-Gaussian, the turbulent energy spectrum has a close to −5/3 power law range, and the turbulence dissipation rate obeys the nonequilibrium dissipation scaling if the energy of the coherent structures is not included in the scaling. In this same range of streamwise distances, the coherent structure dissipation rate decays proportionally to the stochastic turbulence dissipation rate and there is a strong tendency of alignment or antialignment between fluctuating velocities and fluctuating vorticities which appears to coincide with the presence of coherent structures.
Issue Date: 31-Dec-2018
Date of Acceptance: 1-Dec-2018
URI: http://hdl.handle.net/10044/1/65552
DOI: https://dx.doi.org/10.1103/physrevfluids.3.124609
ISSN: 2469-990X
Publisher: American Physical Society
Journal / Book Title: Physical Review Fluids
Volume: 3
Issue: 12
Copyright Statement: © 2018 American Physical Society.
Sponsor/Funder: Commission of the European Communities
Commission of the European Communities
Funder's Grant Number: 320560
FP7 - 317269
Publication Status: Published
Article Number: 124609
Online Publication Date: 2018-12-26
Appears in Collections:Aeronautics
Faculty of Engineering