This paper investigates the suppression of vortex shedding of a system comprised of a main circular cylinder surrounded by eight small rotating rods. Numerical simulations for an inviscid flow and a viscous flow at a Reynolds number of 100 have been performed. The rotation of each rod was controlled to promote the injection of momentum into the boundary layer and to mitigate the formation of vortices in the wake. Two cases have been investigated regarding the rotation speeds: case 0, in which all rods rotated at the same rate; and case 1, in which the rotation speeds were inspired by the potential-flow velocity field around a bare cylinder. Results showed that given enough rotation speed, both cases completely suppressed the formation of vortices, reducing the mean drag coefficient below that of a bare cylinder and mitigating fluctuating lift. Case 1 was the most efficient in reducing drag. Considering the system’s total power loss, there is a range of rotation speeds capable of reducing the overall drag with minimum power spent to rotate the rods. It is worth noting that simulations with the inviscid flow captured an inversion of lift acting on the rotating rods that has not been verified to occur for the viscous flow.

本文研究了一个系统的涡旋脱落抑制，该系统由一个由八个小旋转杆包围的主圆柱体组成。已经对雷诺数为 100 的无粘性流和粘性流进行了数值模拟。控制每个杆的旋转以促进动量注入边界层并减轻尾流中涡旋的形成。关于旋转速度已经研究了两种情况：情况 0，其中所有杆以相同的速率旋转；和情况 1，其中旋转速度受到围绕裸圆柱体的势流速度场的启发。结果表明，给定足够的转速，两种情况都完全抑制了涡流的形成，将平均阻力系数降低到低于裸圆柱体的水平，并减轻了波动的升力。案例 1 在减少阻力方面是最有效的。考虑到系统的总功率损耗，有一个转速范围能够以最小的功率消耗来减少总阻力来旋转杆。值得注意的是，对无粘性流的模拟捕获了作用在旋转杆上的升力反转，但尚未证实粘性流会发生这种情况。