The flow field around a square cylinder moving slowly with a constant velocity along the parallel to side-walls of channel was studied by the flow visualization and the numerical ana1ysis. The effect of the channel side-wall and the cylinder position to the flow field was discussed in the range of 0.05 ～ 30 of Reynolds number (Re=BU/ ν) and 2 ～ 5 of side-wall parameter (h=H/B). It was found that numerical results of the flow fie1d agreed with experimental ones. From numerical results on the flow fie1d， we calculated fluid forces actiong on the square cylinder and clarified their characteristics. Besides，we proposed a formula on the drag characteristic in Re=1 ～ 30 and h=2 ～ 5.
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机译：通过流动可视化和数值分析研究了以恒定速度沿着平行于通道侧壁缓慢移动的方圆柱体周围的流场。在0.05〜30的雷诺数（Re = BU /ν）和2〜5的侧壁参数（h = H / B）的范围内讨论了通道侧壁和气缸位置对流场的影响。 ）。发现流动场的数值结果与实验结果吻合。根据流场的数值结果，我们计算了作用在方筒上的流体力，并阐明了它们的特性。此外，针对Re = 1〜30，h = 2〜5的阻力特性，提出了公式。
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