A numerical study on the effects of control plate on the fluid force reduction on a square cylinder has been carried out using lattice Boltzmann method where a configuration of a square cylinder with upstream control plate is studied. In the present computations we have studied the important flow characteristics for 0.1 ≤ l/w ≤ 1 and 1 ≤ g/D ≤ 10. The effects of the l/w and g/D on force reduction, flow separation and vortex shedding frequency have been studied with Reynolds number focused on 150. Vorticity structures, vortex shedding frequency and fluctuating forces and time-mean are presented and discussed. It was found that considerable change in the wake structure and fluid forces depending on the values of l/w and g/D. The numerical results show that there exists an optimum position where the force coefficients acting on the main square cylinder attains their minimum values. At the optimum position, the mean drag coefficient is reduced by 139.3%. Four different flow regimes were identified in this study at different g/D for selected range of l/w. The negative values of drag coefficient for the main square cylinder are also found for different combinations of l/w and g/D.

已经使用格子 Boltzmann 方法对控制板对方形圆柱体上流体力减小的影响进行了数值研究，其中研究了带有上游控制板的方形圆柱体的配置。在目前的计算中，我们研究了 0.1 ≤ l / w  ≤ 1 和 1 ≤  g / D  ≤ 10的重要流动特性 。l / w和g / D 的影响力减少、流动分离和涡旋脱落频率的研究，雷诺数集中在 150。涡度结构、涡旋脱落频率和脉动力和时间均值被提出和讨论。发现尾流结构和流体力的显着变化取决于l / w和g / D 的值。数值结果表明，存在一个最佳位置，即作用在主方柱上的力系数达到最小值。在最佳位置，平均阻力系数降低了 139.3%。在本研究中，针对选定范围的不同g / D确定了四种不同的流态左/右。对于l / w和g / D 的不同组合，还发现了主方圆柱体阻力系数的负值。