A Study on the Flow around a Catamaran

概要

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It is often experienced that the resistance of a catamaran hull form is more than the twice of that of the demihull. To investigate the reason for this resistance increase, the velocity components around a symmetrical catamaran form were measured and compared with those around the demihull. Further, the wake survey and wave pattern measurements were carried out. As a result the wake resistance determined by means of wake survey was found to be more than the twice of that of the demihull. In the lower speed range this resistance increment is simply attributed to the increase of viscous resistance by the velocity augmentation around the catamaran. In the higher speed range, on the other hand, a resistance component due to the breaking waves is added further. Asymmetrical property of the velocity field around each demihull of the catamaran is relatively small and is considered to have less influence on resistance when comparing with the mean velocity augmentation from the demihull condition.
社団法人日本船舶海洋工学会の論文