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SPH modelling as alternative numerical method for wave loading assessment

机译：SPH建模作为波浪加载评估的替代数值方法

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The final design of coastal defenses requires a proper evaluation of actions exerted by the sea waves. Usually wave run-up and wave overtopping are used to define the geometry of coastal defenses and the choice of materials that form such structures. However the wave loadings (forces and/or pressures) have to be estimated to finalize the design and to verify the global structural stability and the possible occurrences of local damages. Depending on design (e.g. foundation systems, materials, armours), each coastal defense can be schematized as a monolithic structure or a space frame. The loading assessment will depend on such schematization. For the most classical coastal defenses (caissons, breakwaters, sea dikes) plenty of literature exists for the wave loading assessment. However, when the geometrical layout or the hydrodynamic conditions differ from the most used ones, there is no formula or method that can easily help for the purpose. In such a case, only physical or numerical modelling can provide the requested results. This is for example the case of the Belgian harbors of Zeebrugge and Blankenberge, for which an upgrade of the existing coastal defenses has been foreseen. The wave loading assessment for these new structures has been carried out at Flanders Hydraulics Research, in Anwterp (Belgium). The SPH-based and mesh-free DualSPHysics numerical model has been used for the numerical force assessment. By means of the numerical modelling, it was possible to investigate further aspects strictly related with the structural design, such as the influence of the wave period on the maximum wave forces and the effects of a parapet built in addition to a vertical storm return wall. The present work gives an overview of the force assessment achieved using DualSPHysics and discusses the aforementioned investigation aspects. The use of numerical modelling for the design of coastal structure is proven as a reliable alternative to experimental campaigns, usually expensive and time-demanding.
机译：沿海防御的最终设计需要对海浪施加的行动进行适当的评估。通常，波浪延伸和波浪泛型用于定义沿海防御的几何形状，以及形成这种结构的材料的选择。然而，必须估计波浪载荷（力和/或压力）以最终确定设计并验证全球结构稳定性和可能的​​局部损坏的发生。根据设计（例如，基础系统，材料，腋窝），每个沿海防御都可以作为单片结构或空间框架。加载评估将取决于此类原则化。对于最古典的沿海防御（CAISSONS，BREAKVATERS，SEA DICKES）有大量的文学，存在用于波浪加载评估。然而，当几何布局或流体动力学条件不同于最常用的时，没有公式或方法可以容易地帮助目的。在这种情况下，只有物理或数值建模只能提供所请求的结果。例如，Zeebrugge和Blankenberge的比利时港的案例，已经预见了现有的沿海防御的升级。这些新结构的波浪加载评估已经在弗兰特·液压研究（比利时）进行了弗兰德斯液压研究。基于SPH的和无网的双级物流数值模型已用于数值力评估。通过数值建模，可以研究与结构设计严格相关的进一步方面，例如除了垂直风暴返回墙上之外的最大波力对最大波力的影响以及栏杆的影响。本工作概述了使用双重学科实现的力量评估，并讨论上述调查方面。沿海地组设计使用数值建模被证明是对实验活动的可靠替代品，通常昂贵且令人艰难的替代品。

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