This paper aims to investigate the hydrodynamics of a flexible fishlike foil undulating near the vertical sidewall by using numerical simulation. To achieve the research target of this paper, an immersed boundary-lattice Boltzmann method (IB-LBM) was proposed for high Reynolds number fluid flow simulation. The influences of the clearance (0.2L ≤ d ≤ 0.8L, L is the chord length of the fishlike foil) between the fishlike foil and sidewall, Strouhal number (0.1 ≤ St ≤ 0.5), and wavelength (0.6L ≤ λ ≤ 1.4L) on the hydrodynamic characteristics and power extraction efficiency were studied. The results indicate that the wall effect on forces increase with increasing St and λ, but it is opposite for the power extraction efficiency. As compared to the case of out of wall effect, the fishlike foil swims near the sidewall has an effect of improving thrust and it will reduce or increase the power extraction efficiency in some specified cases. Moreover, an interesting phenomenon with pair arrayed vortices, pair arrayed low-pressure centers and pair arrayed high-velocity centers are observed due to the presence of sidewall.

本文旨在通过数值模拟研究在垂直侧壁附近起伏的柔性鱼状箔的流体动力学。为了达到本文的研究目的，提出了一种浸入边界格子玻尔兹曼方法（IB-LBM），用于高雷诺数流体流动模拟。的间隙的影响（0.2大号 ≤  d  ≤0.8大号，大号是鱼形箔的弦长）的鱼形箔和侧壁，Strouhal数（0.1之间 ≤ 圣 ≤0.5）和波长（0.6大号 ≤  λ  ≤1.4大号）对水动力特性和动力提取效率进行了研究。结果表明，壁上作用力随St和λ的增加而增加，但与功率提取效率相反。与壁外效应的情况相比，在侧壁附近游动的鱼状箔具有改善推力的效果，并且在某些特定情况下会降低或提高功率提取效率。此外，由于侧壁的存在，观察到了具有成对排列的涡旋，成对排列的低压中心和成对排列的高速中心的有趣现象。