A numerical and experimental investigation of the effect of side walls on hydrodynamic model testing in a wave flume
A numerical and experimental investigation of the effect of side walls on hydrodynamic model testing in a wave flume
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DOI：
10.1016/j.oceaneng.2019.06.013
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发表时间：
2019-08
影响因子：
5
通讯作者：
N. Xie;M. Hann;R. Pemberton;G. Iglesias;D. Greaves
中科院分区：
文献类型：
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作者：
N. Xie;M. Hann;R. Pemberton;G. Iglesias;D. Greaves
侧壁效应通常采用基于势流的数值方法来处理。众所周知，由于波浪水槽中共振频率的存在，与模型实验相比，数值方法高估了水动力。此外，在大多数关于侧壁效应的研究中，模型位于储罐的中心，模型两侧的扰动是对称的，并且在储罐的固有频率处可能不会激发某些响应的共振，例如波面升高和运动。在本研究中，一个朗肯源面元法被用来处理的影响，侧壁和人工阻尼的自由表面边界条件中引入的粘性阻尼效应。对波浪水槽中不同位置的救生艇模型进行了模型试验。计算结果与模型试验结果进行了比较，两者吻合较好，表明在自由面边界条件中加入人工阻尼是有效的，特别是对于水池偏心位置的模型。
The side wall effect was normally tackled by potential flow based numerical methods. It is well known that, due to the existence of the resonance frequency in the wave tank, the numerical methods over-predict the hydrodynamic forces when comparing with model experiments. Furthermore, in most of the previous studies on the effects of the side walls, the model was located at the centre of the tank, the disturbances on both sides of the model are symmetric, and the resonances of some of the responses such as wave surface elevation and motions may not be excited at the tank natural frequencies. In the present study, a Rankine source panel method is used to tackle the effects of the side walls and artificial damping is introduced in the free surface boundary condition to account for the viscous damping effect. Model experiments are carried out for a lifeboat model located at various positions in a wave flume. Numerical results of the wave forces, free surface elevations and motions of the model are compared with the model test measurements, and good agreement is found. It is shown that the inclusion of the artificial damping in the free surface boundary condition is effective, in particular for the model at off-centre position of the tank.