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Phase relationships in presence of a synthetic large-scale in a turbulent boundary layer

Duvvuri, Subrahmanyam and McKeon, Beverley J. (2014) Phase relationships in presence of a synthetic large-scale in a turbulent boundary layer. In: 44th AIAA Fluid Dynamics Conference, 16-20 June 2014, Atlanta, GA.

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A synthetic spanwise-constant spatio-temporal mode is excited in a flat plate turbulent boundary layer through a spatially impulsive patch of dynamic wall-roughness. The streamwise wavelength of the synthetic mode approximately corresponds to the very large-scale motions present in high Reynolds number wall turbulence. Hot wire anemometer measurements made downstream of the roughness forcing reveal the nature of the two dimensional synthetic large-scale and its influence on the small-scale turbulence. A clear phase organizing effect on the small-scales is noticed in presence of the synthetic large-scale. A thorough understanding of these phase relations lays the foundation for a framework that allows for practical manipulation of energetic small-scale turbulence through large-scale inputs by utilizing the inherent non-linear coupling present in the governing Navier-Stokes equations.

Item Type:Conference or Workshop Item (Paper)
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URLURL TypeDescription
Duvvuri, Subrahmanyam0000-0001-8082-1658
McKeon, Beverley J.0000-0003-4220-1583
Additional Information:©2014 AIAA. The support of AFOSR (grant FA-9550-12-1-0469, program manager D. Smith) and a Resnick Sustainability Institute Graduate Research Fellowship (S.D.) is gratefully acknowledged.
Group:Graduate Aerospace Laboratories, Resnick Sustainability Institute, GALCIT
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)FA-9550-12-1-0469
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AIAA Paper2014-2883
Record Number:CaltechAUTHORS:20140713-153917772
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:47154
Deposited By: Subrahmanyam Duvvuri
Deposited On:14 Jul 2014 16:15
Last Modified:11 Nov 2021 22:29

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