Bulletin of the American Physical Society
71st Annual Meeting of the APS Division of Fluid Dynamics
Volume 63, Number 13
Sunday–Tuesday, November 18–20, 2018; Atlanta, Georgia
Session F26: General Fluid Dynamics: Drag Reduction, Obstacles and Constrictions
8:00 AM–10:10 AM,
Monday, November 19, 2018
Georgia World Congress Center
Room: B314
Chair: Jonathan Clausen, Sandia National Lab
Abstract ID: BAPS.2018.DFD.F26.3
Abstract: F26.00003 : Drag reduction via a spanwise body force and its connections to turbulent dynamics*
8:26 AM–8:39 AM
Presenter:
Jae Sung Park
(University of Nebraska-Lincoln)
Authors:
Ethan Davis
(University of Nebraska-Lincoln)
Thomas Hafner
(University of Nebraska-Lincoln)
Jae Sung Park
(University of Nebraska-Lincoln)
An external body force has been successfully used to achieve turbulent drag reduction. In this study, we investigate the effects of a spanwise body force on skin-friction drag reduction in a turbulent channel flow and its connection to turbulent dynamics. A form of a traveling wave is considered for the spanwise body force, which consists of four control parameters that are the magnitude of force, penetration depth, period of oscillation, and wavelength. Direct numerical simulations (DNS) were performed to investigate the effect of these parameters on drag reduction. The current DNS results show that the skin friction is reduced by as much as 20%. An optimal condition of the spanwise body force for drag reduction is further discussed. Interestingly, it is observed that in low-drag intervals, where the wall shear stress is much less than its mean value, the spanwise body force appears to significantly affect turbulent dynamics to make the wall shear stress not as chaotic as in high-drag events. The power analysis of the body force for actual energy savings will be performed to clarify the roles of the body force for the drag reduction process.
*The authors gratefully acknowledge the financial support from the NASA NE Space Grant Fellowship and NASA NE EPSCoR Research Grant.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.F26.3
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