A Study on Performance Evaluation of Non-Reflective Boundary for Progressive Waves Reproduction Introduced in Numerical Wave Tank With MPS Method

Y. Aida, Tomotaka Takeo, T. Ikoma, K. Masuda
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Abstract

Numerical simulation based on the moving particle semi-implicit (MPS) method is effective for the analysis of floating motion in stormy waves in both coastal and offshore areas. However, when the outer circumference of the calculation area is composed of wall boundaries, superimposed waves are generated by the reflected waves, which makes it difficult to reproduce wave fields in offshore areas. Therefore, in this study, we developed two types of non-reflective boundary that can be applied to a numerical wave tank with the MPS method. One type is an attenuation zone in which a high-viscosity region with a finite width is set from the end of the water tank. The other type is a wave absorption control boundary that detects the amount of water surface fluctuation in front of the boundary and prevents reflection via position control. Regular and irregular waves were created in a numerical wave tank with these boundaries and the wave dissipation performance was quantitatively evaluated by comparing the estimates for incident and reflected waves, the time-series waveform, and the wave spectrum.
用MPS法对数值波槽中递进波再现的非反射边界进行性能评价研究
基于运动粒子半隐式(MPS)方法的数值模拟对于分析近岸和近岸风浪中浮物运动都是有效的。然而,当计算区域的外周长由壁面边界组成时,反射波会产生叠加波,这给近海区域的波场再现带来了困难。因此,在本研究中,我们开发了两种类型的非反射边界,可以应用于MPS方法的数值波槽。一种是衰减区,在衰减区中,从水箱的末端设置一个有限宽度的高粘度区域。另一种类型是波吸收控制边界,它检测边界前水面波动的量,并通过位置控制防止反射。利用这些边界在数值波槽中产生规则波和不规则波,并通过比较入射波和反射波的估计、时间序列波形和波谱来定量评价波的耗散性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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