波流共同作用下珊瑚礁海岸水动力特性数值模拟研究

doi:10.11978/2023028

Abstract

Abstract:

To investigate the flow characteristics around the reef coast under the combined effects of waves and currents, a two-dimensional numerical wave tank is developed based on the Reynolds-Averaged Navier-Stokes equations (RANS), the SST turbulence model is solved for the turbulence and the volume of fluid (VOF) method is used to track the free surface. Different shoreward currents and seaward currents are tested and they are compared with the wave only. The effects of current on the cross-reef wave height and mean water level as well as the mean flow field, turbulent kinetic energy, and Reynolds shear stress around the surf zone are investigated. Compared to the measurements without the current, both wave height and wave setup on the reef flat are reduced by the shoreward current but they are increased by the seaward current. Furthermore, the ranges of their variations increase with the increasing flowrate. Around the surf zone, the flows along water depth are shoreward directed in the presence of shoreward current, but they are shoreward/seaward directed above/under the wave trough in the presence of seaward current. Moreover, the magnitudes of both currents below the wave trough increase with the increasing flowrate. Finally, both the turbulence kinetic energy and the Reynolds shear stress associated the breaking waves decrease as the shoreward flowrate increases, but their values increase as the seaward flowrate increases.

Key words: ambient current, surf zone, Navier-Stokes equations, coral reef

PENG Erman, YAO Yu, LI Zhuangzhi, XU Conghao. Numerical study of the hydrodynamic characteristics of reef coast under the combined effects of waves and currents[J].Journal of Tropical Oceanography, 2024, 43(3): 187-194.

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References 18

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Numerical study of the hydrodynamic characteristics of reef coast under the combined effects of waves and currents

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