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Effects of a gain-based optimal forcing on turbulent channel flow

Sharma, A. and Moarref, R. and Luhar, M. and Goldstein, D. B. and McKeon, B. J. (2014) Effects of a gain-based optimal forcing on turbulent channel flow. In: 52nd Aerospace Sciences Meeting, 13-17 January, 2014, National Harbor, MD.

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The effects of introducing a two- or three-dimensional streamwise traveling wave type body forcing in a turbulent channel flow at Re_τ = 180 are investigated using direct numerical simulations (DNS). The optimal forcing shape (that is, the forcing that leads to the most amplified or highest-gain velocity response) is obtained from the resolvent analysis of McKeon & Sharma (2010) for wave-numbers and wave-speed representative of the near-wall cycle. The velocity response due to imposed forcing obtained from DNS is found to agree well with resolvent analysis predictions at small forcing amplitude. The changes in mean velocity, shear stress and kinetic energy are characterized for various amplitudes of forcing.

Item Type:Conference or Workshop Item (Paper)
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URLURL TypeDescription
Sharma, A.0000-0002-7170-1627
McKeon, B. J.0000-0003-4220-1583
Additional Information:© 2014 AIAA. This work is supported by the Air Force Office of Scientific Research under a Basic Research Initiative grant, # FA9550-12-1-0469 (program manager Dr. Doug Smith). The computational support for the simulations is provided by Texas Advanced Computing Center (TACC).
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)FA9550-12-1-0469
Record Number:CaltechAUTHORS:20141107-145723375
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51465
Deposited By: Jamie Sei
Deposited On:07 Nov 2014 23:21
Last Modified:10 Nov 2021 19:11

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