FOCUSING OF INTERNAL WAVES GENERATED BY OSCILLATING TOROIDAL BODIES IN A UNIFORMLY STRATIFIED FLUID
S. A. Kudryashova1, N. D. Shmakova1, N. V. Gavrilov2, E. V. Ermanyuk2
1Perm State Humanitarian-Pedagogical University, Perm, Russia
2Lavrentyev Institute of Hydrodynamics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
Keywords: internal wave, wave focusing, stratified fluid
Abstract
We present an experimental study of internal wave focusing generated by the horizontal oscillations of a toroidal body in a linearly stratified fluid. The cross section of the body is circular, while the curve connecting the centers of these cross sections is elliptical, defining a torus-like shape. For the case of an axisymmetric oscillating torus, the measured amplitude distribution of internal waves in its vicinity is compared with predictions from linear theory under the thin-body approximation. We show that wave generation by non-axisymmetric radiators leads to a reduction in the wave amplitude within the focal zone, attributable to differences in both the total radiated power and the spatial structure of the focusing region. Finally, we construct isosurfaces of the experimentally measured wave amplitudes in the focusing zone and compare these data with results derived from ray theory.
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