This paper aims to simulate unstable gap flows of three side-by-side cylinders unequally/equally spaced at T1/d = 1.5 and T2/d = 1.6 in a uniform cross flow (Re=300). The simulation is carried out using ANSYS Flotran 7.0. A mesh-independent study is conducted on a single cylinder at Re=100. The Strouhal number and wake flow characteristics compare well with experimental results. Simulation of three side-by-side cylinders in uniform cross flow has revealed that the gap flows are unstable and constantly re-orientating, which has the effect of restructuring the wake flows behind the cylinders. The flow field for unequal spacing of the cylinders is similar to the equal spacing case for some period of time with a symmetrical near wake. However, at other times, the wake flow is asymmetrical. This agrees well with the visualisation of Wang et al. (2002), in which the gap flows and the wake flow are constantly in transition.
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机译：本文旨在模拟在均匀的横流中（Re = 300），三个并排的圆柱体的不均匀间隙流动，它们在T1 / d = 1.5和T2 / d = 1.6时不等/等距。使用ANSYS Flotran 7.0进行仿真。在Re = 100的单个圆柱上进行独立于网格的研究。 Strouhal数和尾流特性与实验结果很好地比较。在均匀的错流中对三个并排气缸的仿真显示，间隙流不稳定并且不断地重新定向，这具有重新构造气缸后面的尾流的效果。汽缸间距不等的流场在一段时间内类似于对称间隔的情况，具有对称的近尾流。但是，在其他时候，尾流是不对称的。这与Wang等人的可视化非常吻合。 （2002年），其中间隙流动和尾流不断变化。
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