Regular and singular flow components for stimulated and free oscillations of a sphere in continuously stratified liquid

The patterns visualizing singular components in flows generated by a sphere performing forced periodic oscillations in continuously stratified liquid is presented. The basic characteristics of a stratified medium are the density and its gradient that are dependent on the vertical coordinate. The source of the motion is a sphere, which executes harmonic vertical oscillations at the frequency with the peak-to-peak value. The smallest of the basic scales determines the spatial resolution of the instrument providing the registration of all flow components. The basic image components are four inclined bimodal beams of periodic internal waves. A constant extended light domain of a complicated shape between the oscillating body and four wave beams exist in the flow pattern. It was observed that the formation jets attain their maxima when the frequency of the body's stimulated oscillations coincides with the buoyancy frequency.