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曲线运动潜体近水面兴波时域研究
Time-domain simulations of the submerged body's curvilinear motion near the water surface
孙博伟, 郑尧坤, 林志良
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作者单位:上海交通大学 船舶海洋与建筑工程学院 海洋工程国家重点实验室, 上海 200240
中文关键字:面元法;快速多极子法;潜体时域兴波;近水面曲线运动
英文关键字:panel method; fast multipole method; time-domain wave making; curvilinear motion near the surface
中文摘要:本文利用快速多极子面元法的高效性与精确性,对近水面潜体在水平面曲线运动过程中的时域兴波势流问题展开研究。首先确定了自由面网格密度及时域更新方法以保证数值模拟的准确性,探索了椭球潜体在水下做直线运动与曲线运动时阻力系数与升力系数变化的区别,明确了曲线运动过程中各项系数的变化规律,并针对不同的偏航角度的兴波特性进行比较,研究偏航角度大小对于潜体兴波阻力、升力以及表面兴波波形的影响。研究结果表明,当偏航角较大时,表面兴波对曲线运动潜体所受阻力和升力影响均非常显著;随着偏航角度的变大,各波系间的相互作用更加明显,表面波形更为复杂,导致了兴波阻力激增,阻力及升力曲线均出现大幅波动且不对称性。
英文摘要:In this paper, the wave making resistance of submerged body in curvilinear motion of the same depth is studied using the fast multipole panel method with high efficiency and accuracy. After determining the appropriate grid density, difference between the rectilinear motion and curvilinear motion in wave making resistance and lift force becomes clear. For different values of the so-called yawing angle, quantitative analysis is done to find out the influence of the angle on the wave making resistance, lift force and the generating surface waves. The results turn out to be that when the yawing angle is large, the influence of the surface wave on the resistance and lift is significant. As the yawing angle increases, interaction between different wave components becomes significant, the waveform on the surface is more complicate, and the curves of resistance and lift force have large fluctuation and become asymmetry.
2020,42(4): 18-24 收稿日期:2018-11-29
DOI:10.3404/j.issn.1672-7649.2020.04.004
分类号:U661
作者简介:孙博伟(1994-),男, 硕士研究生,研究方向为水动力学问题数值计算
参考文献:
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