Viscous spreading of an inertial wave beam in a rotating fluid

Details Viscous spreading of an inertial wave beam in a rotating fluid Viscous spreading of an inertial wave beam in a rotating fluid

2010-03-18

arxiv.org/abs/1003.3631v2

Physics

Fluid Dynamics

Scientific paper

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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