Three-dimensional numerical wave tank simulations on fully nonlinear wave–current–body interactions
Three-dimensional numerical wave tank simulations on fully nonlinear wave–current–body interactions
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DOI：
10.1007/s773-001-8377-2
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发表时间：
2001-06
影响因子：
2.6
通讯作者：
Jong-Chun Park;Moo-Hyun Kim;H. Miyata
中科院分区：
文献类型：
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作者：
Jong-Chun Park;Moo-Hyun Kim;H. Miyata
本文采用有限差分法和标记单元法（MAC）进行了数值波浪水槽（NWT）模拟，研究了定常均匀流作用下非线性波浪运动及其与三维静止物体相互作用的特性。在计算域中求解Navier-Stokes（NS）方程，并在直角坐标系下采用有限差分时间推进格式更新每个时间步的边界值。完全非线性运动自由面条件是由两个流体层的标记密度函数技术满足。入射波是从流入边界产生的，通过规定一个类似于一个灵活的皮瓣造波机的运动的速度分布，和传出波数值消散内的人工阻尼区位于年底的坦克。利用NS-MAC小波变换，研究了静止垂直截断圆柱周围的非线性波流相互作用，并与Mercier和Niedzwecki的实验结果、基于线性势理论的时域小波变换、完全非线性小波变换和二阶绕射计算结果进行了比较.
A finite-difference scheme and a marker-and-cell (MAC) method are used for numerical wave tank (NWT) simulations to investigate the characteristics of nonlinear wave motions and their interactions with a stationary three-dimensional body in the presence of steady uniform currents. The Navier–Stokes (NS) equation is solved in the computational domain, and the boundary values are updated at each time-step by a finite-difference time-marching scheme in the frame of a rectangular coordinate system. The fully nonlinear kinematic free-surface condition is satisfied by the marker–density function technique developed for two fluid layers. The incident waves are generated from the inflow boundary by prescribing a velocity profile resembling the motions of a flexible flap wavemaker, and the outgoing waves are numerically dissipated inside an artificial damping zone located at the end of the tank. Using the NS–MAC NWT, nonlinear wave and current interactions around a stationary vertical truncated circular cylinder are studied, and the results are compared with the experimental results of Mercier and Niedzwecki, a time-domain NWT based on linear potential theory, a fully nonlinear NWT, and a second-order diffraction computation.