Study of forebody shape effect on ship resistance in still water and in waves
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Abstract
Design and optimization of ship hull form for minimizing resistance and satisfying other project requirements is a well-known problem of naval architecture. A suggested method of hull form design and optimization uses CFD analysis for evaluation of resistance responses to systematic transformations of hull surface. The transformations at first are set on curves of sectional areas and then are applied to corresponding regions of hull surfaces according to special techniques of rebuilding. Each separate transformation corresponds to a new version of hull form with transformed region of surface. These versions are used in CFD simulations for evaluation of resistance changes in still water, which are at the heart of optimization procedures. As a result, an optimal form of sectional area curve expressing an optimal longitudinal distribution of constant hull volume and, eventually, an optimized shape of hull surface can be obtained. The method was applied to forebodies of two ships including the well-known KCS hull form and showed promising results. This paper describes some further improvements of the method performed after analysis of its reliability and practical features. It is shown that accuracy can be noticeably improved based on analysis of grid convergence. Significantly higher detailing and flexibility of transformations can be achieved through setting overlapping regions on initial hull form. In addition, the optimization results obtained in still water were assessed with respect to resistance in waves. It turned out that the applied changes of the KCS hull form have no perceptible effect on resistance in head regular and irregular waves
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References
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