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 A17: Flow Control: Drag Reduction
8:00 AM–9:57 AM,
Sunday, November 18, 2018
Georgia World Congress Center
Room: B304
Chair: Matthew Juniper, University of Cambridge
Abstract ID: BAPS.2018.DFD.A17.2
Abstract: A17.00002 : Mach number effect on drag control via spanwise wall oscillation in wall-bounded turbulent flows
8:13 AM–8:26 AM
Presenter:
Jie Yao
(Texas Tech Univ)
Authors:
Jie Yao
(Texas Tech Univ)
Fazle Hussain
(Texas Tech Univ)
The spanwise wall oscillation (SWO) is known to substantially reduce the skin-friction drag in wall-bounded turbulent flows. To understand the scope and limitations of this flow control for compressible flows, direct numerical simulations of isothermal channel flow with SWO are performed. At a fixed bulk Reynolds number Reb of 3000, we investigate subsonic and supersonic flows at bulk Mach numbers Mab of 0.8 and 1.5, respectively. The drag reduction DR as a function of the control parameters (namely, maximum wall velocity A+ and oscillation period T+; + denotes wall units scaling) has similar trend as the incompressible case: DR increases monotonically with A+, but varies non-monotonically with T+. For a given maximum wall velocity A+(=12), similar maximum DR is achieved as in the incompressible cases at the same Reτ. However, the optimal oscillation period T+ is found to slightly increase with Ma. The flow statistics and physics are examined to explain the mechanism for drag reduction. Similar to the incompressible case, the coherent structures are highly suppressed by SWO. These results suggest that significant DR can still be achieved via SWO even when the compressibility effect is considered. The effectiveness of SWO at higher Re’s and Ma’s is being explored.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.DFD.A17.2
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