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Session: Passive Wake flows
Session starts: Wednesday 05 November, 10:20
Presentation starts: 10:40
Room: Commission roon 2

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Fan Duan (Fluid Mechanics Key Laboratory of Education Ministry, Beihang University, Beijing, China)
Jin-Jun Wang (Fluid Mechanics Key Laboratory of Education Ministry, Beihang University, Beijing, China)

Abstract:
The splitter plate is one of the most effective devices for controlling the flow over a bluff body. Recently, the flexible splitter plate has garnered significant attention due to its self-adaptive behavior and flutter-induced perturbations, which hold promise for a more efficient control effect. In this experimental investigation, we explore the influences of different splitter plates on the wake characteristics of a circular cylinder, with a particular focus on the wake spatial scale and the wake fluctuation. Two characteristic streamwise positions in the wake are identified, that is, x/L_r = 1.0 and x/L_r = 1.8 (L_r is the recirculation region length). The wake flow field is categorized into three stages based on the two positions. The wake overall fluctuation undergoes a linear increase initially, then attains a saturation stage, and finally decays as a power law. For all the cases, the wake overall fluctuations scale with their saturation-stage magnitudes, resulting in a collapse of all the data onto a universal scaling curve.