Internal Gravity Waves

The image shows internal gravity waves generated in a salt stratified fluid. by vertically oscillating an elliptical cylinder. The wave emanate from the cylinder in a cross pattern (one branch of which is shown), although the phase lines move in a direction perpendicular to the group velocity. A secondary weak beam of waves emanates above the primary beam in this experiment. This secondary beam results from nonlinear wave-wave interactions between the primary beams that travel upward and downward to the right of the cylinder. Using a new ``synthetic schlieren'' technique, the structure of the waves are quantitatively measured continuously and non-intrusively, making use of DigImage, an image retrieval and processing system. The experimental results are then compared with numerical simulations and theoretical predictions.
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Bruce R. Sutherland, Mar 97,