Direct numerical simulation of Taylor–Couette flow subject to opposition control is investigated at Reynolds number (Re) of 3000. The idea is to impose exact opposite velocities of the detection plane at the walls to counteract near-wall stream-wise vortices. In this study, various velocity control strategies, namely wall-normal, axial, combined and blowing only, have been investigated from the viewpoint of skin-friction drag reduction. Further, the effects of skipping spatial points in azimuthal and axial directions and in time have been investigated from a drag reduction point of view. Based on the emergence of a virtual wall that hinders the vertical transport of momentum (i.e. on reduction of Reynolds shear stress production as well as sweep $\mathrm{\&}$ ejection events), flow physics has been explained via statistical analysis of fluctuations, Reynolds shear stresses, and near-wall coherent structures. The spatial density of near-wall vortical structures shows a marked reduction, followed by quadrant contribution analysis of Reynolds shear stresses reveals a decrease in ejection and sweep events, leading to reduced production of Reynolds shear stresses and skin-friction drag.

在雷诺数 (Re) 为 3000 时研究了受对立控制的 Taylor-Couette 流的直接数值模拟。这个想法是在壁上施加完全相反的检测平面速度以抵消近壁流向涡流。在这项研究中，从表面摩擦减阻的角度研究了各种速度控制策略，即壁面法向、轴向、组合和仅吹气。此外，已经从减阻的角度研究了在方位角和轴向方向以及时间上跳过空间点的影响。基于阻碍动量垂直传输的虚拟墙的出现（即减少雷诺剪切应力的产生以及扫掠$\mathrm{\&}$喷射事件），流动物理学已经通过波动、雷诺剪应力和近壁相干结构的统计分析来解释。近壁涡结构的空间密度显示出显着降低，随后对雷诺剪应力的象限贡献分析显示喷射和扫掠事件减少，导致雷诺剪应力和皮肤摩擦阻力的产生减少。