Imperial College London

ProfessorSergeiChernyshenko

Faculty of EngineeringDepartment 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

@inproceedings{Blesbois:2011,
author = {Blesbois, O and Chernyshenko, SI},
title = {Generalised optimal perturbation approach applied to drag reduction by wall oscillations in turbulent flows},
year = {2011}
}

RIS format (EndNote, RefMan)

TY  - CPAPER
AB - © 2011 CURRAN-CONFERENCE. All rights reserved. Drag reduction by wall oscillations in turbulent flows has recently been shown to be a promising technique. The reduction of the near wall streaks amplitude is known to play a significant role in the drag reduction mechanism. To gain a better understanding of the effect of wall oscillations on the streaks, the Generalised Optimal Perturbation (GOP) approach, based on the linearised Navier-Stokes equation, is used. Resemblance between drag and certain quantities arising in the GOP context is observed. It is found that for harmonic wall oscillations the streaks have an approximately constant angle to the main flow direction, with a jump in sign twice in the period. The mechanism of this phenomenon is clarified. The results are in a reasonable agreement with direct numerical simulations.
AU - Blesbois,O
AU - Chernyshenko,SI
PY - 2011///
TI - Generalised optimal perturbation approach applied to drag reduction by wall oscillations in turbulent flows
ER -