1. On the thrust generation and wake structures of two travelling-wavy foils
- Author
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Guo-Xin Yan, Li-Ming Chao, Guang Pan, and Dong Zhang
- Subjects
Physics ,Environmental Engineering ,Flow (psychology) ,Reynolds number ,020101 civil engineering ,Ocean Engineering ,Thrust ,02 engineering and technology ,Mechanics ,Wake ,Interference (wave propagation) ,Vortex shedding ,01 natural sciences ,010305 fluids & plasmas ,0201 civil engineering ,symbols.namesake ,0103 physical sciences ,Fluid dynamics ,symbols ,Dimensionless quantity - Abstract
This paper presents a systematic work focused on the thrust generation and wake structures of two travelling-wavy foils with tandem, parallel and staggered arrangements, therein presenting essential information about actual schooling fish. The fluid dynamics around two identical foils arranged with a dimensionless horizontal gap, G x , and vertical gap, G y , are investigated at Reynolds number R e = 2 × 1 0 5 . The wake structures are classified into proximity interference, wake interference, proximity and wake interference, and no interference associated with thrust generation. Based on numerical computations, we find that G x significantly affects the re-organisation of the vortex shedding from the leading and following foils, resulting in various propulsive forces acting on the foils. Moreover, G y causes a result whereby the vortex shedding from the leading foil deflects towards the flow behind the following foil, leading to a slight change in the thrust generation for both travelling-wavy foils. This work is helpful for guiding the queue control of multiple bio-inspired underwater robots.
- Published
- 2019