Using a porous-media approach for CFD modelling of wave interaction with thin perforated structures
Using a porous-media approach for CFD modelling of wave interaction with thin perforated structures
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DOI：
10.1007/s40722-020-00183-7
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发表时间：
2020-12
影响因子：
1.9
通讯作者：
Anna Feichtner;E. Mackay;G. Tabor;P. Thies;L. Johanning;D. Ning
中科院分区：
文献类型：
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作者：
Anna Feichtner;E. Mackay;G. Tabor;P. Thies;L. Johanning;D. Ning
这项工作提出了使用多孔介质的方法计算流体动力学（CFD）模拟波与薄穿孔板和圆柱体的相互作用。穿孔结构没有明确解决，但表示的体积多孔区的体积平均压力梯度的形式的阻力项应用到Navier-Stokes动量方程。针对一系列孔隙率和规则波条件，分析了结构物上的水平力和圆柱体模型周围波规处的自由表面高程。计算流体动力学结果与线性势流模型的结果进行了验证，并与实验结果进行了验证。所施加的压力梯度公式产生良好的协议，所有孔隙度值，波频率和波陡度的调查。它表明，用于大体积颗粒材料的各向同性宏观孔隙率表示也可以用于薄穿孔结构。与基于线性势流理论的方法相比，该方法在可建模的波浪条件范围内提供了更大的灵活性，并且与解析通过开口的流动的CFD方法相比，该方法需要更小的计算工作量。因此，该方法可以是一个有效的替代工程问题的大规模的影响，如全球的力量和整体的流动行为的主要利益。
This work presents the use of a porous-media approach for computational fluid dynamics (CFD) modelling of wave interaction with thin perforated sheets and cylinders. The perforated structures are not resolved explicitly but represented by a volumetric porous zone where a volume-averaged pressure gradient in the form of a drag term is applied to the Navier–Stokes momentum equation. The horizontal force on the structures and the free-surface elevation at wave gauges around the cylinder model have been analysed for a range of porosities and regular wave conditions. The CFD results are verified against results from a linear potential-flow model and validated against experimental results. The applied pressure gradient formulation produces good agreement for all porosity values, wave frequencies and wave steepnesses investigated. It is demonstrated that an isotropic macroscopic porosity representation used for large volumetric granular material can also be used for thin perforated structures. This approach offers greater flexibility in the range of wave conditions that can be modelled compared to approaches based on linear potential-flow theory and requires a smaller computational effort compared to CFD approaches which resolve the flow through the openings. The approach can therefore be an efficient alternative for engineering problems where large-scale effects such as global forces and the overall flow-behaviour are of the main interest.