Optical measurement of ship waves by digital image correlation
Résumé
A large part of the drag experienced by fast sailing boats originates from the energy radiated at the sea surface by waves. Optimising hull shape in order to minimise wave resistance requires thus a good knowledge of the wave structure created by the ship as well as its evolution with boat heel and boat speed. This knowledge usually originates from numerical simulations or towing experiments. We present here an optical method allowing the determination of the instantaneous 3D water surface shape with a good vertical resolution on large horizontal scales. This method may be useful in towing tank tests and should allow detailed comparisons with computed surface deformation and thus help to validate Velocity Prediction Programs.
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