Flow pattern and hydrodynamic parameters of pile breakwater under solitary wave using OpenFOAM. (1st September 2021)

• Record Type: Journal Article
• Authors: Yin, Mingjian; Zhao, Xizeng; Luo, Min; Sun, Hongyue
• Is Part Of: Ocean engineering. Volume 235(2021)
• Publication Date: 2021-09-01
• Subjects: Solitary wave -- Pile breakwater -- Flow pattern -- Hydrodynamic parameters -- OpenFOAM; Ocean engineering -- Periodicals; Ocean engineering; Periodicals; 620.4162
• DOI: 10.1016/j.oceaneng.2021.109381
• Languages: English
• ISSNs: 0029-8018

Abstract

Abstract: Pile breakwaters are widely used for coastal protection. To ensure the safety and hence serviceability of pile breakwaters under disastrous waves like tsunamis, an accurate estimation of wave actions exerted on them is necessary. This work investigates the hydrodynamic properties of solitary waves (resemble tsunami waves) interacting with a single-row pile breakwater using OpenFOAM. Large eddy simulation (LES) is utilized to deal with the turbulent flow, and the free-surface is reproduced by a scheme named THINC/QQ (tangent of hyperbola for interface capturing with quadratic surface representation and Gaussian quadrature). This numerical model is validated against published experimental data. Using the verified model, flow patterns near the piles are interpreted. A parametric study is then conducted on the influences of incident wave height, blockage ratio and pile diameter to the hydrodynamic parameters of pile breakwater, which include wave run-up, wave force and jet velocity. Finally, semi-empirical formulas are established for quick and reliable evaluation of these parameters. The research work can provide guideline for practical design of pile breakwater. Highlights: Flow pattern of solitary wave interactions with pile breakwater is interpreted. Special hydrodynamic phenomena under nonlinear wave actions are explained. Semi-empirical formulas are established for hydrodynamic parameters of engineering interest.