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arXiv 1003.3631physics.flu-dyn
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惯性波在旋转流体中的粘性传播

Viscous spreading of an inertial wave beam in a rotating fluid

Pierre-Philippe Cortet, Cyril Lamriben, Frederic Moisy

摘要:

本文报道了旋转流体中振荡圆柱产生的惯性波的实验测量结果。二维波发生在静止的十字形波包中。用共转粒子图像测速系统测量了垂直于造波机的垂直平面内的速度场和涡量场。的粘性传播的光束和相关的衰减的速度和涡度包络的特点。发现它们与线性粘性理论的相似解很好地一致,线性粘性理论是在类似于Thomas和Stevenson [J. Fluid Mech.54(3),495-506(1972)]对内波的经典分析的准平行假设下导出的。

英文摘要:

We report experimental measurements of inertial waves generated by an oscillating cylinder in a rotating fluid. The two-dimensional wave takes place in a stationary cross-shaped wavepacket. Velocity and vorticity fields in a vertical plane normal to the wavemaker are measured by a corotating Particule Image Velocimetry system. The viscous spreading of the wave beam and the associated decay of the velocity and vorticity envelopes are characterized. They are found in good agreement with the similarity solution of a linear viscous theory, derived under a quasi-parallel assumption similar to the classical analysis of Thomas and Stevenson [J. Fluid Mech. 54 (3), 495-506 (1972)] for internal waves.

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