Abstract In this paper, a hybrid scheme, Fluid–Fluid–Elastic Structure (FFES) model was developed in the time domain to address the wave breaking impact on the structure. The model is developed based on the partitioned approach with different governing equations that describe various regions of the model domain. The fluid–fluid model denotes that two different fluid models were used to describe fluid in the actual physical domain. The method is a physics-based approximation to reduce the computational time, i.e. in the far-field inviscid fluid (fully nonlinear potential flow theory model), and near to the structure, viscous fluid (Navier Stokes model) is used. The coupled model then interacts with the elastic structure (based on Euler–Bernoulli beam theory). The system of equations is strongly coupled both in space and time. The Fluid–Fluid coupling uses an implicit predictor–corrector scheme, and the fluid–structure coupling works based on an iterative scheme. This approach makes the method more robust and for future extension. Three different possibilities for introducing the coupling was identified and implemented. The model was validated against results from the analytical solution and literature. The method proposed is a reliable, robust, and efficient alternative for simulating fluid–structure interaction problems.

中文翻译：

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基于网格和无网格方法的混合模型的开发及其在自由表面波的流体-弹性结构相互作用中的应用

摘要 在本文中，在时域中开发了一种混合方案，即流体-流体-弹性结构（FFES）模型，以解决波浪破碎对结构的影响。该模型是基于分区方法开发的，具有描述模型域各个区域的不同控制方程。流体-流体模型表示使用两种不同的流体模型来描述实际物理域中的流体。该方法是一种基于物理的近似，以减少计算时间，即在远场无粘性流体（完全非线性势流理论模型）中，在结构附近，使用粘性流体（纳维斯托克斯模型）。然后耦合模型与弹性结构相互作用（基于 Euler-Bernoulli 梁理论）。方程组在空间和时间上都是强耦合的。流体-流体耦合使用隐式预测器-校正器方案，流固耦合基于迭代方案工作。这种方法使该方法更加健壮并便于将来扩展。确定并实施了引入耦合的三种不同可能性。该模型根据解析解和文献的结果进行了验证。所提出的方法是模拟流固耦合问题的可靠、稳健且有效的替代方法。该模型根据解析解和文献的结果进行了验证。所提出的方法是模拟流固耦合问题的可靠、稳健且有效的替代方法。该模型根据解析解和文献的结果进行了验证。所提出的方法是模拟流固耦合问题的可靠、稳健且有效的替代方法。