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 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 particle 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 quasiparallel
assumption similar to the classical analysis of Thomas and Stevenson A similarity solution for
viscous internal waves, 德国LaVision PIV/PLIF粒子成像测速场仪