旋转流体中惯性波束的粘滞扩散
We report experimental measurements of inertial waves generated by an oscillating cylinder in arotating 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 acorotating particle image velocimetry system. The viscous spreading of the wave beam and theassociated decay of the velocity and vorticity envelopes are characterized. They are found in goodagreement with the similarity solution of a linear viscous theory, derived under a quasiparallelassumption similar to the classical analysis of Thomas and Stevenson “A similarity solution forviscous internal waves,”