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Vortex shedding suppression and aerodynamic characteristics of square cylinder due to offsetting of rectangular cylinders towards a plane

机译：矩形圆柱体向平面偏移导致的方形圆柱体涡旋脱落抑制和空气动力特性

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摘要

Numerically simulated results are presented for shear flow past a square cylinder (of height A) near a wall (at a gap height 0.5A) in the presence of a family of upstream rectangular cylinders (of different heights a and widths b ≤ a) in an offset tandem arrangement (towards the wall) in order to investigate the physical mechanism for the cessation of vortex shedding from the downstream cylinder due to this arrangement and the dependency of the aerodynamic characteristics of the downstream cylinder on the operational dimensionless parameters, Reynolds number Re, gap height L from the wall, spacing distance between the cylinders S, ratio of heights r_2 = a/A ( ≤ 1 ) and aspect ratio r_1 = b/a ( ≤ 1 ). The governing unsteady Navier-Stokes equations are solved numerically through SIMPLE algorithm with the QUICK scheme for convective terms. The strong dependency of diversion of the flow (away from the narrow passage between the downstream cylinder's lower face and the wall) on the shape (square/rectangular) and the position (with respect to the wall and the downstream cylinder) of the upstream cylinder is explored in this study and is justified physically exhibiting the flow structures and gap flow. The discontinuous jump in the aerodynamic characteristics against the flow parameters is absent in this arrangement since the change in the flow patterns between the cylinders is essentially found to be minimum.
机译：给出了一系列上游矩形圆柱（不同高度a和宽度b≤a）的剪切流穿过壁（间隙高度0.5A）附近的方形圆柱（高度A）的数值模拟结果。偏移串联布置（朝向壁），以便研究由于这种布置而停止从下游气缸涡流脱落的物理机制，以及下游气缸的空气动力学特性对操作无量纲参数的依赖性，雷诺数Re ，距墙的间隙高度L，圆柱S之间的间距，高度比r_2 = a / A（≤1）和长宽比r_1 = b / a（≤1）。对于非对流项，通过采用SIMPLE算法和QUICK方案对控制非定常的Navier-Stokes方程进行了数值求解。流量转移（远离下游圆柱体下表面和壁之间的狭窄通道）强烈依赖于上游圆柱体的形状（正方形/矩形）和位置（相对于壁和下游圆柱体）在这项研究中进行了探索，并在物理上展示了流动结构和间隙流动。在该布置中不存在空气动力学特性相对于流动参数的不连续跳跃，因为发现气缸之间的流动模式的变化基本上是最小的。

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