Two-dimensional numerical investigations are carried out to understand the effect of rotation on flow characteristics over two identical circular cylinders in an unconfined medium at low Reynolds number. Both the cylinders are placed in tandem arrangement transverse to the incoming flow, and the dimensionless spacing between the cylinders is varied in the range \(0.2 \le g* \le 3.0\). Unsteady laminar incompressible flow computations are performed for all spacings using a finite volume technique at constant Reynolds number (Re = 100) and Prandtl number (Pr = 0.71). The upstream and downstream cylinders are made to rotate in the clockwise and counterclockwise directions, respectively. Results show that the counter rotation brings stability in the flow field around the cylinders, which in turn alters the fluid flow and heat transfer characteristics. At some point of the rotation rate, irrespective of the direction of rotation, the flow permutes from unsteady periodic vortex shedding to the steady state. Moreover, the critical rotational speed slightly decreases with gap spacing and shoots up at larger gap spacing.

进行二维数值研究以了解旋转对低雷诺数下无约束介质中两个相同圆柱体的流动特性的影响。两个圆柱体横向于进入流串联布置，圆柱体之间的无量纲间距在\(0.2 \le g* \le 3.0\)范围内变化. 在恒定雷诺数 (Re = 100) 和普朗特数 (Pr = 0.71) 下，使用有限体积技术对所有间距进行非定常层流不可压缩流动计算。使上游和下游气缸分别沿顺时针和逆时针方向旋转。结果表明，逆向旋转带来了圆柱周围流场的稳定性，这反过来又改变了流体流动和传热特性。在旋转速率的某个点，无论旋转方向如何，流动都会从不稳定的周期性涡旋脱落到稳定状态。此外，临界转速随间隙间距略有下降，并在较大间隙间距处上升。