ABSTRACT In the present study, the wave excitation forces acting on an array of porous circular cylinders are examined based on diffraction problems. To calculate the wave forces, the fluid domain is divided into three regions i.e. a single exterior region, N interior regions and N beneath regions, and the diffraction in each fluid region is expressed by an eigenfunction expansion method with using 3-dimension liner potential theory (Williams and Li, 2000). Especially, the present method is extended to the case of an array of truncated porous circular cylinders to calculate the heave forces as well as surge and sway forces. To verify this method, the numerical results obtained by eigenfunction are compared with these results obtained by higher order boundary element method (Choi et al., 2000). The numerical results obtained by this study are in good agreement with those results. By changing the numbers of porous circular cylinders, the angle of incident wave and the porosity rate of circular cylinders, the wave excitation forces such as surge, sway and heave on an array of truncated porous circular cylinders are investigated.
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机译：摘要在本研究中，基于衍射问题检查了作用在多孔圆柱阵列上的波激发力。为了计算波浪力，将流体域划分为三个区域，即单个外部区域，N个内部区域和N个下部区域，并使用3维线性势能理论通过本征函数展开方法来表达每个流体区域中的衍射。 （Williams and Li，2000）。特别地，本方法扩展到一系列截顶的多孔圆柱体的情况，以计算起伏力以及喘振和摇摆力。为了验证该方法，将通过本征函数获得的数值结果与通过高阶边界元方法获得的这些结果进行了比较（Choi等，2000）。通过这项研究获得的数值结果与这些结果非常吻合。通过改变多孔圆柱的数量，入射波的角度和圆柱的孔隙率，研究了在一系列截短的多孔圆柱上的波动激励力，例如喘振，摇摆和升沉。
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