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Turbulence Amplitude Modulation in an Externally Forced, Subsonic Turbulent Boundary Layer

Ranande, Piyush and Duvvuri, Subrahmanyam and McKeon, Beverley and Gordeyev, Stanislav and Christensen, Kenneth and Jumper, Eric (2016) Turbulence Amplitude Modulation in an Externally Forced, Subsonic Turbulent Boundary Layer. In: 54th AIAA Aerospace Sciences Meeting, January 4-8, 2016, San Diego, CA.

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This paper describes an experiment in which a forced shear layer external to a turbulent boundary layer is used to impart external large-scale forcing to the boundary layer. The shear-layer forcing creates periodic coherent vortical structures in the shear layer that convect at the shear-layer convective velocity. The convecting coherent structures create a concomitant unsteady pressure field that provides a disturbance for the turbulent boundary layer on the upper wall of the tunnel above the forced shear layer. The unsteady pressure field in turn creates a variation of the effective freestream velocity experienced by the boundary layer, and both the pressure disturbance and the concomitant velocity fluctuations are reported. The character of the turbulence in the boundary layer due to the external forcing is studied through hot-wire anemometry. Thorough examination of the turbulence results in similarities between the turbulence amplitude modulation results due to these externally-forced experiments and modulation response of an internally-forced boundary layer done by others.

Item Type:Conference or Workshop Item (Paper)
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URLURL TypeDescription
Duvvuri, Subrahmanyam0000-0001-8082-1658
McKeon, Beverley0000-0003-4220-1583
Additional Information:© 2016 AIAA. This effort were funded in part by the High Energy Laser - Joint Technology Office (HEL-JTO) and administered through the Air Force Office for Scientific Research (AFOSR) under Grant Number FA9550-13-1-0001. The U.S. Government is authorized to reproduce and distribute reprints for governmental purposes notwithstanding any copyright notation thereon.
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)FA9550-13-1-0001
Record Number:CaltechAUTHORS:20160212-132731202
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Official Citation:Piyush M. Ranade, Subrahmanyam Duvvuri, Beverley J. McKeon, Stanislav Gordeyev, Kenneth T. Christensen, and Eric J. Jumper. "Turbulence Amplitude Modulation in an Externally Forced, Subsonic Turbulent Boundary Layer", 54th AIAA Aerospace Sciences Meeting, AIAA SciTech, (AIAA 2016-1120).
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:64480
Deposited By: Jamie Sei
Deposited On:18 Feb 2016 23:49
Last Modified:10 Nov 2021 23:31

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