Turbulence dissipation and the role of coherent structures in the near wake of a square prism
File(s)PhysRevFluids.3.124609.pdf (1.38 MB)
Published version
Author(s)
Alves Portela, F
Papadakis, G
Vassilicos, JC
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.
Date Issued
2018-12
Date Acceptance
2018-12-01
Citation
Physical Review Fluids, 2018, 3 (12)
ISSN
2469-990X
Publisher
American Physical Society
Journal / Book Title
Physical Review Fluids
Volume
3
Issue
12
Copyright Statement
© 2018 American Physical Society.
Sponsor
Commission of the European Communities
Commission of the European Communities
Grant Number
320560
FP7 - 317269
Publication Status
Published
Article Number
124609
Date Publish Online
2018-12-26