Dynamic response of a semi-free flexible filament in the wake of a flapping foil
| Autor: | Qi Wang, Xinyi He, Xingjian Lin, Guoyi He |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
Physics::Biological Physics Flapping foil Mechanical Engineering Physics::Medical Physics macromolecular substances Mechanics Wake 01 natural sciences eye diseases 010305 fluids & plasmas Vortex Quantitative Biology::Subcellular Processes Physics::Fluid Dynamics Protein filament Drag Physics::Space Physics 0103 physical sciences Flapping Fish 010306 general physics FOIL method |
| Zdroj: | Journal of Fluids and Structures. 83:40-53 |
| ISSN: | 0889-9746 |
| Popis: | The passive response of a semi-free flexible filament in the wake of a flapping foil is studied numerically Three distinct flapping states are observed for the filament in different vortex streets: flapping between Karman vortices, flapping outside reversed Karman vortices and static in compact Karman vortices. Both the vertical dipole-induced velocity and the transport speed of the vortices determine the filament’s flapping motion. A significant drag reduction is obtained for the filament when flapping outside reversed Karman vortices compared to flapping between vortices. The pitching foil has decreased drag when the downstream filament is static. These passive flapping motions of the filament in different wakes may be beneficial for achieving a better understanding of fish swimming mechanics and behaviors in schools. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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