波浪与外壁透空双方形沉箱相互作用

在线性波浪理论下,利用复合边界元素法(composite BEM)数值解析在等水深、规则波浪入射二种外壁透空双方形沉箱的无因次波力及Kd绕射分布图,并分别与其他研究者所作双圆筒内、外圆柱无因次波力及绕射分布图的计算结果进行比较,都说明本模式的合理性和可行性。在考虑不同透水参数下,分别计算波浪作用在内、外结构物的波力及沉箱四周绕射系数大小分布图。计算结果显示:波浪作用于外壁透空全透水双方形沉箱,外方柱无因次最大波力值会随着透水参数增加而降低;内方柱无因次最大波力值则随着透水参数增加而增加。本研究结果可供设计外海透水方形沉箱结构交互作用参考。

Wave action on dual-square caisson with perforated outer wall

In this paper, wave action on dual-square caisson with perforated outer wall systems is investigated. Under the assumptions of potential flow and linear wave theory, a numerical solution has been obtained by a composite boundary element method (composite BEM). The exterior structure is a porous plate whose dimension is thin in thickness and the interior square caisson is impermeable. The accuracy and validity of the method have been compared to the solution obtained by Teng et al. and Sun for hydrodynamic force and the contour of wave elevation around cylinder. Excellent agreement has been observed. Structures with different geometrical cross sections and different porous effect parameters are considered. The total net hydrodynamic forces acting on both inner structure and outer square caisson are determined numerically. Numerical results have presented the magnitude of the diffraction coefficient with different porous effect parameters. It has been found that the increased porous effect parameter of the square caisson may result in a significant reduction in the maximum dimensionless wave force acting on the outer porous caisson. This study may provide useful hydrodynamic information for the design of an offshore square porous caisson.