Numerical and experimental studies of moving cylinder in uni-directional focusing waves
Numerical and experimental studies of moving cylinder in uni-directional focusing waves
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发表时间：
2015
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通讯作者：
S. Yan;Q. Ma;V. Sriram;L. Qian;P. M. Ferrer;T. Schlurmann
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作者：
S. Yan;Q. Ma;V. Sriram;L. Qian;P. M. Ferrer;T. Schlurmann
本文介绍了单向聚焦波与圆柱体相互作用的实验和数值研究。已使用两种数值工具进行调查。其中包括基于全非线性势理论（FNPT）的拟任意拉格朗日欧拉有限元法（QALE-FEM）和采用一般流动理论的OpenFOAM。基于二阶造波理论产生了单向聚焦波。在研究中考虑了受这种波作用的固定圆柱体和运动圆柱体。本文着重研究了圆柱表面的波浪高程和压力时程。对比结果表明，在圆柱固定或低速运动时，QALE-FEM数值计算结果与实验数据吻合较好。然而，由于势法不能模拟旋涡脱落，当运动速度较大时，这种差异会很明显。
This paper presents the experimental and numerical investigations on the interaction between uni-directional focusing waves and a cylinder. Two numerical tools have been used to conduct the investigations. These include the Quasi Arbitrary Lagrangian Eulerian Finite Element Method (QALE-FEM) based on the fully nonlinear potential theory (FNPT) and the OpenFOAM adopting general flow theory. The unidirectional focusing waves are generated based on the second order wavemaker theory. Both fixed cylinder and moving cylinder subjected to such waves are considered in the investigation. The wave elevations and the pressure time histories on the surface of the cylinder are focused in the paper. The comparison shows that the numerical results from the QALE-FEM can agree very well with experimental data when the cylinder is fixed or moving at a slow speed. However, the difference can be significant when the moving speed is large due to the fact that the potential method cannot model the vortex shedding.