Imperial College London
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ProfessorSylvainLaizet

Faculty of Engineering, Department of Aeronautics

Professor in Computational Fluid Mechanics
 
 
 
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Contact

 

+44 (0)20 7594 5045s.laizet Website

 
 
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Location

 

339City and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Laizet:2015:10.1063/1.4923042,
author = {Laizet, S and Nedic, J and Vassilicos, JC},
doi = {10.1063/1.4923042},
journal = {Physics of Fluids},
title = {The spatial origin of-5/3 spectra in grid-generated turbulence},
url = {http://dx.doi.org/10.1063/1.4923042},
volume = {27},
year = {2015}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - A combined wind tunnel and computational study of grid-generated turbulencealong the centreline shows that the close to −5/3 power law signature of energyspectra in the frequency domain originates relatively close to the grid not only wherethe velocity derivative statistics become quite suddenly isotropic but also wherethe turbulent fluctuating velocities are very intermittent and non-Gaussian. As theinlet flow velocity increases, these power laws are increasingly well defined andincreasingly close to −5/3 over an increasing range of frequencies. However, thisrange continuously decreases with streamwise distance from the grid even though thelocal Reynolds number first increases and then decreases along the same streamwiseextent. The intermittency at the point of origin of the close to −5/3 power spectraconsists of alternations between intense vortex tube clusters with shallow broad-bandspectra and quiescent regions where the velocity fluctuations are smooth with steepenergy spectra.
AU  - Laizet,S
AU  - Nedic,J
AU  - Vassilicos,JC
DO  - 10.1063/1.4923042
PY  - 2015///
SN  - 1089-7666
TI  - The spatial origin of-5/3 spectra in grid-generated turbulence
T2  - Physics of Fluids
UR  - http://dx.doi.org/10.1063/1.4923042
UR  - http://hdl.handle.net/10044/1/25647
VL  - 27
ER  -
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