波浪与内外壁透空双层透水结构相互作用

摘要

In this study, we investigate wave interaction with a concentric cylinder comprising dual porous structure systems. A numerical solution is obtained using a composite boundary element method under the assumptions of po⁃tential flow and linear wave theory. The method accuracy and validity are compared to the solution obtained using the scaled boundary finite⁃element method for the wave relative run⁃up and hydrodynamic force in a concentric por⁃ous cylinder, and an excellent agreement is observed between the method accuracy and validity. The numerical re⁃sults showed that the hydrodynamic force acting on the dual porous cylinder is mostly reduced with the existence of the inner and outer dual porous cylinders if compared to the force exerted on the single porous cylinder. The in⁃creased porous effect parameter of the dual porous cylinders may result in a significant reduction of the maximum di⁃mensionless wave force acting on the inner and outer porous cylinders.%本文探讨波浪入射内、外壁皆透空双层透水沉箱的无因次波力、总力及沉箱内、外圈四周相对爬升的问题，并在线性波浪理论下，采用复合边界元素法（ composite BEM ）做数值解析。为了验证本文数值模式正确性，与SBFEM方法所计算外壁透空双圆筒内、外圆柱相对爬升及无因次波力的结果进行比较及验证，获得精度高、正确且合理结果。数值计算结果显示：采用双层透水沉箱与传统单层外壁透空内筒不透水的波力比较，大部分也都有降低现象。波浪作用于内、外壁皆透空双层透水沉箱内、外筒无因次波力及总力值皆会随透水参数的增加而降低。