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To improve the seakeeping capability, some devices, such as submerged plates, are often installed on floating structures. The attached plate cannot only suppress the motion response, but also provide ...an additional immersed body surface that receives fluid action, aggravating the wave loads. In this study, a theoretical model is developed within the context of linear potential theory to study the hydrodynamic characteristics of a floating column with a submerged plate attached at the bottom. The eigenfunction 18 expansion matching method is applied to obtain the velocity potential, based on which the linear wave force and wave runup can be found immediately. A novel derivation of the mean drift force formulation is developed via the application of Green’s second identity to the velocity potential and its derivative in finite fluid volume surrounding the body. Formulations that involve control surface can then be derived. With the availability of the velocity potential, semi-analytical solution of the mean drift force on the combined column-plate structure is developed based on respectively the derived and the classic far-field formulations. After conducting convergence tests and validating the theoretical model, detailed numerical analysis is performed thereafter based on the theoretical model. The influence of the plate size, such as the radius and height, on the wave force and the associated wave runup are assessed.続きを見る
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