Bottom and surface proximity effects on the added mass of Rankine ovoids.
Fickel, Monty George.
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The free-surface and bottom-proximity effects on the added mass of Rankine ovoids of various length-to-diameter ratios were experimentally investigated by vertically oscillating the ovoids normal to their major axis. The results have shown that the bottom-proximity increases the added mass and the free-surface proximity decreases it. Furthermore, the added mass increases with increasing length-to-diameter ratio, i.e., for more cylinder-like ovoids, and approaches that predicted analytically for an infinitely long cylinder. Finally, an appropriate analysis based on the strip-method and the cylinder results has shown that the bottom-proximity effect on the added mass of Rankine ovoids may be predicted with sufficient accuracy. The prediction of the surface-proximity effect requires more refined methods.
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