Vortical structures in the wake of falling plates
| Autor: | Wei-Xi Huang, Yong-Xia Jia, Chun-Xiao Xu, Jun-Duo Zhang, Edwin M. Lau |
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| Rok vydání: | 2018 |
| Předmět: |
Flow visualization
Physics Convection Flow (psychology) 020207 software engineering 02 engineering and technology Mechanics Wake Condensed Matter Physics Vortex shedding 01 natural sciences Kármán vortex street 010305 fluids & plasmas Physics::Fluid Dynamics Particle image velocimetry 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Electrical and Electronic Engineering Falling (sensation) |
| Zdroj: | Journal of Visualization. 22:15-24 |
| ISSN: | 1875-8975 1343-8875 |
| DOI: | 10.1007/s12650-018-0520-4 |
| Popis: | Flow visualization and particle image velocimetry are applied to capture the flow fields generated by all three states of a falling plate in two dimensional passive flight—fluttering, chaotic, and tumbling. The vortical structures are recorded in considerable clarity. Classic vortex shedding from different flight states are observed. The causes of more energetic tumbling mixing and localized fluttering disturbances are discussed. Strong, but small trailing processions of Karman vortex pairs or Kelvin–Helmholtz instabilities are found. It is also found that their formations are dependent on the trajectory, distinguishing the unique flow structures that different flight paths leave behind. The falling plate also induces a significant downwards convective motion. Further investigation shows that the wake trail and the convection contribute to the complex formation and dissipation of large vortical structures. |
| Databáze: | OpenAIRE |
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