CaltechAUTHORS
Published January 2014 | public
Conference Paper Metadata-only

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

Sharma, A. ORCID icon
Moarref, R.
Luhar, M.
Goldstein, D. B.
McKeon, B. J. ORCID icon
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Abstract

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.

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).

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August 19, 2023
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October 18, 2023