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Modeling solitary wave transformation and run-up over fringing reefs with large bottom roughness
Ocean Engineering ( IF 5 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.oceaneng.2020.108208
Yu Yao , Xianjin Chen , Conghao Xu , Meijun Jia , Changbo Jiang

Abstract Field observations over decades have found that the surface roughness of coral reefs is typically one or two order of magnitude larger than that of sandy beaches. To better reproduce the solitary wave transformation and run-up over fringing reefs with large bottom roughness, a numerical wave tank based on the CFD tool OpenFOAM® is developed in this study. The Reynolds-Averaged Navier-Stokes (RANS) equations are solved for two-phase incompressible flow with the k-ω SST model for the turbulence closure and VOF method for tracking the free surface. The reef surface with high friction is modeled by coupling a porous media model in the RANS equations. The model is first validated by our new performed laboratory experiments as well as a laboratory dataset in the literature. A fixed set of model parameters is found to be suitable for both experiments. Subsequently, the model is applied to evaluate the impacts of hydrodynamic, morphological and roughness element factors on the wave run-up on the back-reef beach, and an empirical formula is proposed to predict the wave run-up based on the simulations. Finally, the cross-reef variations of flow and vorticity fields under the breaking solitary waves are also examined via the numerical simulations.

中文翻译:

模拟孤立波变换和大底粗糙度边缘礁上的爬升

摘要 几十年来的实地观察发现,珊瑚礁的表面粗糙度通常比沙滩大一到两个数量级。为了更好地再现大底粗糙度边缘礁上的孤立波变换和上升,本研究开发了基于 CFD 工具 OpenFOAM® 的数值波浪水池。使用用于湍流闭合的 k-ω SST 模型和用于跟踪自由表面的 VOF 方法求解两相不可压缩流的雷诺平均纳维-斯托克斯 (RANS) 方程。通过在 RANS 方程中耦合多孔介质模型来模拟具有高摩擦力的珊瑚礁表面。该模型首先通过我们新进行的实验室实验以及文献中的实验室数据集进行验证。发现一组固定的模型参数适用于这两个实验。随后,该模型被应用于评估水动力、形态和粗糙度元素因素对后礁海滩的波浪爬高的影响,并在模拟的基础上提出了预测波浪爬高的经验公式。最后,还通过数值模拟研究了破碎孤立波下流场和涡度场的跨礁变化。
更新日期:2020-12-01
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