Preferential orientation of spheroidal particles in wavy flow
Preferential orientation of spheroidal particles in wavy flow
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DOI：
10.1017/jfm.2018.738
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发表时间：
2018-10-11
影响因子：
3.7
通讯作者：
Ouellette, Nicholas T.
中科院分区：
文献类型：
--
作者：
DiBenedetto, Michelle H.;Ouellette, Nicholas T.
本文对线性波场中非惯性球形小粒子的角动力学进行了理论研究。我们恢复观察最近报道的DiBenedetto等人。(J.流体机械，第837卷，2018年，pp. 320-340），这些球体的取向往往是一个稳定的极限环组成的一个优选值与叠加振荡。我们表明，这种行为是有限波振幅的后果，是斯托克斯漂移的角度模拟。我们推导出的颗粒，这只取决于颗粒形状的优选取向的表达式，和关于这个优选值的振荡的振幅，这另外取决于波参数和在水柱中的颗粒的深度。
We report a theoretical study of the angular dynamics of small, non-inertial spheroidal particles in a linear wave field. We recover the observation recently reported by DiBenedetto et al.(J. Fluid Mech., vol. 837, 2018, pp. 320-340) that the orientation of these spheroids tends to a stable limit cycle consisting of a preferred value with a superimposed oscillation. We show that this behaviour is a consequence of finite wave amplitude and is the angular analogue of Stokes drift. We derive expressions for both the preferred orientation of the particles, which depends only on particle shape, and the amplitude of the oscillation about this preferred value, which additionally depends on the wave parameters and the depth of the particle in the water column.