为研究并列反向旋转双圆柱的尾流干涉效应及流动控制机制，本文通过二维直接数值模拟（DNS）方法对并列反向旋转双圆柱进行研究。采用OpenFOAM中的pimpleFoam求解器，分析了不同间隙比和转速比下的尾流特性、升力、阻力及速度场变化。结果表明，尾流呈现五种典型模式：不规则泄涡、单钝体泄涡、同相泄涡、反相泄涡和稳定流。在外向对转工况下，尾流的临界转速比随着间隙比增大而减小；而内向对转则呈现相反趋势，最终二者均趋近于单圆柱的临界转速比。通过势流理论分析，揭示了内向对转时，双圆柱周围形成虚拟椭圆流线，并发生流动反转的机理。研究为反向旋转圆柱在海洋、航空领域的流动控制应用提供了一定理论参考。

To investigate the wake interference effects and flow control mechanisms, we conduct two-dimensional direct numerical simulations (DNS) of two side-by-side counter-rotating cylinders. The OpenFOAM pimpleFoam solver is employed to analyze wake characteristics, lift and drag coefficients, and variations in the velocity field under different gap ratios and rotational speed ratios. The results show that the wake exhibits five typical modes: irregular vortex shedding, single bluff-body shedding, in-phase vortex shedding, out-of-phase vortex shedding, and steady flow. Under outward counter-rotation, the critical rotational speed ratio of the wake decreases as the gap ratio increases. In contrast, for inward counter-rotation, the critical speed ratio increases, with both conditions ultimately approaching the critical speed ratio of a single cylinder. Through potential flow theory, the study reveals the mechanism of wake reversal and the formation of virtual elliptical flow lines around the cylinders during inward counter-rotation. These findings provide a theoretical foundation for the application of counter-rotating cylinders in flow control, particularly in marine and aerospace engineering.