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中文摘要：
该文基于计算流体动力学（CFD）与离散单元法（DEM）的基本原理，建立了CFD-DEM耦合数值模型。应用所建立的三维CFD-DEM耦合数值模型模拟了不同工况下孤立波与防波堤离散体相互作用的详细过程，验证了离散体颗粒之间的屏障效应和离散体结构受孤立波作用而产生变形的物理过程。模拟结果符合预期和物理规律，验证了该耦合数值模型的有效性及模拟精度。该CFD-DEM耦合数值模型可以为进一步研究波浪与离散体结构防波堤相互作用中结构的稳定性问题和水动力特性提供非常有效的研究手段。
英文摘要：
A CFD-DEM coupled numerical model is established based on the computational fluid dynamics （CFD） and discrete element method （DEM）. The three-dimensional CFD-DEM coupled numerical model is used to simulate the interaction between solitary waves and gravel breakwater under different conditions, which validates the sheltering effect among the discrete particles and the deformation process of breakwater structure made of discrete sphere forced by solitary waves. The simulation results are in accordance with the expectation and the laws of physics, which reveals the effectiveness of the coupled numerical model and the simulation precision. The CFD-DEM model can provide a very effective research method to further investigate relative issues in this kind of coastal engineering.
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