关于CFD数值波浪水槽模拟：使用几何方法的静态边界波浪吸收增强
On CFD Numerical Wave Tank Simulations: Static-Boundary Wave Absorption Enhancement Using a Geometrical Approach
摘要：
本研究的目的是扩展适用性的静态边界吸收方法在相解析计算流体动力学模拟以外的传统浅水波的限制。尽管这种方法最初是基于传统的活塞式造波机为浅水波浪制定的，但与其他可用的数值波浪吸收替代方案相比，将其使用扩展到深水条件提供了更实用和计算成本更有效的解决方案。为此，本文从理论上和数值上研究了半无限水槽中单向单色波在静壁作用下的吸收问题。此外，实施到一个实际的波结构相互作用的应用进行了研究数值和实验。利用开源C++工具箱OpenFOAM实现了基于雷诺平均Navier-Stokes（RANS）方程的相位分辨数值模型。该研究提出了静态边界法的性能，以无量纲的方式，通过限制深度，在该深度处的主动吸收常规活塞的速度分布被引入;作为入射波条件的函数。此外，它示出的静态边界方法的性能可以显着增强波反射减少到约一半的常规设置在深水条件下。此外，吸收深度与入射波条件相关;为选择吸收壁的适当尺寸提供优化框架。最后，通过波浪-结构物相互作用试验验证了数值模型的性能，结果表明模型与试验观测值吻合较好。所提出的限制器直接应用于现有的波浪-结构相互作用CFD求解器，而不需要修改代码。
英文摘要：
The present study aims to extend the applicability of the static-boundary absorption method in phase-resolving CFD simulations outside the conventional shallow-water waves limit. Even though this method was originally formulated for shallow-water waves based on the conventional piston type wavemaker, extending its use to deeper water conditions provides a more practical and computationally cost efficient solution compared to other available numerical wave absorption alternatives. For this sake, absorption of unidirectional monochromatic waves in a semi-infinite flume by means of a static wall is investigated theoretically and numerically. Moreover, implementation to a practical wave-structure interaction application is investigated numerically and experimentally. A phase-resolving numerical model based on the Reynold-averaged Navier-Stokes (RANS) equations is implemented using the open source C++ toolbox OpenFOAM. The study presents the performance of the static-boundary method, in a dimensionless manner, by limiting the depth at which the active-absorption conventional-piston velocity profile is introduced; as a function of incident wave conditions. Moreover, it is shown that the performance of the static-boundary method can be significantly enhanced where wave reflection was reduced to about half of that of the conventional setup in deep-water conditions. Furthermore, the absorption depth is correlated to the incident wave conditions; providing an optimization framework for the selection of the proper dimensions of an absorbing wall. Finally, wave-structure interaction experimental tests were conducted to validate the numerical model performance; which shows an acceptable agreement between the model and the experimental observations. The proposed limiter is straight forward to be applied in pre-existing wave-structure interaction CFD solvers, without the need of code modifications.
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