Drag reduction by passive in-plane wall motions in turbulent wall-bounded flows
TI Józsa - 2018 - era.ed.ac.uk
Losses associated with turbulent flows dissipate a significant amount of generated energy.
Such losses originate from the drag force, which is often described as the sum of the
pressure drag and the friction drag. This thesis sets out to explore the hypothesis that
passive wall motions driven by fluid mechanical forces are able to reduce the friction drag in
fully developed turbulent boundary layers. Firstly, the streamwise and spanwise opposition
controls proposed by Choi et al.(1994, Journal of Fluid Mechanics) are revisited to identify …
Such losses originate from the drag force, which is often described as the sum of the
pressure drag and the friction drag. This thesis sets out to explore the hypothesis that
passive wall motions driven by fluid mechanical forces are able to reduce the friction drag in
fully developed turbulent boundary layers. Firstly, the streamwise and spanwise opposition
controls proposed by Choi et al.(1994, Journal of Fluid Mechanics) are revisited to identify …
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