核电站防波堤抗海啸漂浮物冲击数值模拟及分析

Collision Analysis of Objects Drifted by Run-up Tsunami Using Drifted Objects-wave-breakwater Collision Coupled Model

对海啸漂浮物冲击沿海防浪堤造成的结构安全问题,基于多物质ALE(Arbitrary Lagrangian-Eulerian)方法,利用带阻尼罚函数实现波浪、海啸漂浮物和防浪堤结构三者之间的耦合作用,建立三维数值冲击耦合模型,模拟了孤立波带动漂浮物冲击防浪堤结构的动态响应过程.首先通过物理模型试验验证所用数值方法的可靠性,在此基础上研究了防浪堤挡浪墙抗海上和陆上漂浮物的冲击能力,并且从漂浮物的质量、漂浮物距挡浪墙的距离等参数对冲击规律展开研究.结果表明,带漂浮物的海啸相比海啸波对结构更具破坏力;漂浮物质量和相对于防浪堤的初始位置对防浪堤的冲击响应有较大影响.

To solve structural safety problem of the coastal breakwater caused by tsunami with drifted objects,based on the ALE（ Arbitrary Lagrangian-Eulerian） method and the penalty method with damping,three dimensional models of the breakwater-wave and the breakwater-wave-drifted object coupling system were constructed. The dynamic behaviors of the breakwater under the impact of solitary wave and object drifted by run-up tsunami were numerically simulated.Firstly,the model and approaches were validated by comparing the simulation results with experimental data. Then,the performances of the coastal breakwater were discussed. And the influences of the mass of the drifted objects as well as distance between the drifted objects and the breakwater were studied in detail. The results showed that,compared to the tsunami wave,the tsunami containing the drifted objects brings more impact; the mass and the initial position relative to breakwater of drifted objects have great effects on the breakwater ＇s dynamic response.