Dynamics of a deformable body in a fast flowing soap film.
Dynamics of a deformable body in a fast flowing soap film.
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DOI：
10.1103/physrevlett.97.134502
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发表时间：
2006-06
影响因子：
8.6
通讯作者：
Sunghwan Jung;Kathleen Mareck;M. Shelley;Jun Zhang
中科院分区：
文献类型：
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作者：
Sunghwan Jung;Kathleen Mareck;M. Shelley;Jun Zhang
我们研究嵌入在流动的肥皂膜中的弹性环的行为。这种可变形的环被润湿到膜中，并且被保持固定在单个点处，以抵抗迎面而来的流。我们解释这个系统作为一个二维柔性体在二维流相互作用。这种耦合的流固系统表现出双稳态，既有稳态又有振荡态。在静止状态下，环基本上保持静止，其尾流是冯·卡门涡列。在其振荡状态下，环脱落两个涡偶极子，或更复杂的旋涡结构，在每个振荡周期。我们发现，环路的振荡频率与流速成线性比例，并测得的斯特劳哈尔数可以分离的尾迹结构的基础上。
We study the behavior of an elastic loop embedded in a flowing soap film. This deformable loop is wetted into the film and is held fixed at a single point against the oncoming flow. We interpret this system as a two-dimensional flexible body interacting in a two-dimensional flow. This coupled fluid-structure system shows bistability, with both stationary and oscillatory states. In its stationary state, the loop remains essentially motionless and its wake is a von Kármán vortex street. In its oscillatory state, the loop sheds two vortex dipoles, or more complicated vortical structures, within each oscillation period. We find that the oscillation frequency of the loop is linearly proportional to the flow velocity, and that the measured Strouhal numbers can be separated based on wake structure.