Journal
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
Volume 57, Issue 11, Pages 2133-2140Publisher
SCIENCE PRESS
DOI: 10.1007/s11433-014-5416-2
Keywords
turbulence control; direct numerical simulation; channel flow; Lorentz force; drag reduction
Categories
Funding
- National Natural Science Foundation of China [11172140, 11202102]
- Specialized Research Fund for Doctoral Program of Higher Education [20123219120050]
- EU FP6 Framework Program AVERT
- Faculty of Engineering, University of Nottingham
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Turbulent control and drag reduction in a channel flow via a bidirectional traveling wave induced by spanwise oscillating Lorentz force have been investigated in the paper. The results based on the direct numerical simulation (DNS) indicate that the bidirectional wavy Lorentz force with appropriate control parameters can result in a regular decline of near-wall streaks and vortex structures with respect to the flow direction, leading to the effective suppression of turbulence generation and significant reduction in skin-friction drag. In addition, experiments are carried out in a water tunnel via electro-magnetic (EM) actuators designed to produce the bidirectional traveling wave excitation as described in calculations. As a result, the actual substantial drag reduction is realized successfully in these experiments.
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