Imperial College London
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ProfessorSergeiChernyshenko

Faculty of Engineering, Department of Aeronautics

Chair in Aerodynamics
 
 
 
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Contact

 

+44 (0)20 7594 5548s.chernyshenko Website

 
 
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Location

 

211aCity and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Iyer:2019:10.1017/jfm.2019.520,
author = {Iyer, A and Witherden, F and Chernyshenko, S and Vincent, P},
doi = {10.1017/jfm.2019.520},
journal = {Journal of Fluid Mechanics},
pages = {758--780},
title = {Identifying eigenmodes of averaged small-amplitude perturbations to turbulent channel flow},
url = {http://dx.doi.org/10.1017/jfm.2019.520},
volume = {875},
year = {2019}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Eigenmodes of averaged small-amplitude perturbations to a turbulent channel flow — which is one of the most fundamental canonical flows — are identified for the first time via an extensive set of high-fidelity GPU-accelerated direct numerical simulations. While the system governing averaged small-amplitude perturbations to turbulent channel flow remains unknown, the fact such eigenmodes can be identified constitutes direct evidence that it is linear. Moreover, while the eigenvalue associated with the slowest-decaying anti-symmetric eigenmode mode is found to be real, the eigenvalue associated with the slowest-decaying symmetric eigenmode mode is found to be complex. This indicates that the unknown linear system governing the evolution of averaged small-amplitude perturbations cannot be self-adjoint, even for the case of a uni-directional flow. In addition to elucidating aspects of the flow physics, the findings provide guidance for development of new unsteady Reynolds-averaged Navier-Stokes turbulence models, and constitute a new and accessible benchmark problem for assessing the performance of existing models,which are used widely throughout industry.
AU  - Iyer,A
AU  - Witherden,F
AU  - Chernyshenko,S
AU  - Vincent,P
DO  - 10.1017/jfm.2019.520
EP  - 780
PY  - 2019///
SN  - 0022-1120
SP  - 758
TI  - Identifying eigenmodes of averaged small-amplitude perturbations to turbulent channel flow
T2  - Journal of Fluid Mechanics
UR  - http://dx.doi.org/10.1017/jfm.2019.520
UR  - https://www.cambridge.org/core/journals/journal-of-fluid-mechanics/article/identifying-eigenmodes-of-averaged-smallamplitude-perturbations-to-turbulent-channel-flow/EF03E2FFFF1A481FC55448B3F11496F2
UR  - http://hdl.handle.net/10044/1/70664
VL  - 875
ER  -
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