Abstract
The dynamics of a neutrally buoyant float descending from the surface to its level of neutral buoyancy in a stable linearly stratified fluid are considered theoretically and experimentally. When the descent is large compared to the float size, the dynamics can be modeled by balancing the acceleration, buoyancy and drag forces, using a quadratic velocity drag form. A general analytical solution can be found in the phase plane, and several typical solutions are computed. Results of visual and quantitative experiments in a salt-stratified tank were in agreement with the theoretical results.
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