Azimuthal flow associated with inertial wave resonance in a precessing cylinder
Azimuthal flow associated with inertial wave resonance in a precessing cylinder
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DOI：
10.1017/s0022112096007380
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发表时间：
1996-07
影响因子：
3.7
通讯作者：
J. J. Kobine-J.
中科院分区：
文献类型：
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作者：
J. J. Kobine-J.
对低粘度流体在绕对称轴作匀速快速旋转的直圆柱内的流动进行了一系列实验。该轴又绕穿过圆柱体质心的第二轴进行不太快的进动。流体对这种力的线性无粘响应可以表示为惯性波模式的谱。然而，有几个有趣的功能，与非线性和粘性效应的问题。一个这样的现象是出现的方位流的条件下，相关的基本线性惯性波的行为。结果提出有关的方式，这种流动取决于各种实验参数。还研究了强迫开始后环流的动力学性质。在强迫频率接近基本惯性波共振的流量被发现有一个漩涡状的结构，这导致的数据表明，流体动力学不稳定性可能会发挥一部分，在所观察到的故障湍流运动的制度强强迫。
A series of experiments has been carried out on low-viscosity fluid in a right-circular cylinder that rotates rapidly at a constant speed about its axis of symmetry. This axis in turn is made to undergo less rapid precession about a second axis passing through the centroid of the cylinder. The linear inviscid response of the fluid to such forcing can be expressed as a spectrum of inertial wave modes. However, there are several interesting features of the problem that are associated with nonlinear and viscous effects. One such phenomenon is the appearance of an azimuthal flow under conditions that are related to the underlying linear inertial wave behaviour. Results are presented concerning the manner in which this flow depends on the various experimental parameters. Dynamical properties of the circulation following the onset of forcing have also been investigated. The flow at forcing frequencies close to the fundamental inertial wave resonance was found to have a vortex-like structure, and this led to data that suggest that hydrodynamic instabilities may play a part in the observed breakdown to turbulent motion in regimes of strong forcing.