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使用浸入边界法研究了小圆柱对主圆柱涡脱落的抑制.方法中使用非贴体笛儿尔网格,易于处理包含复杂边界的流动问题.采用离散附加力直接加入边界条件方法对虚单元进行重构,使边界条件在浸入边界上精确满足.使用隐式分步法解二维非定常不可压Navier-Stokes方程,通过速度和压力解耦提高计算效率.数值模拟单圆柱绕流及不同位置小圆柱和主圆柱的流动干扰,通过分析流场涡结构和升、阻力系数,得到小圆柱对主圆柱涡脱落的延迟和抑制作用.计算结果与已有实验结论和数值结果对比,计算误差不超过5%,说明浸入边界法可以简单有效地处理圆柱涡脱落抑制这类流动干扰问题.
The immersion boundary method is used to study the suppression of the vortex shedding of the small cylinders by using the non-fitted Bessel grid, which is easy to deal with the flow problems with complex boundaries. The discrete elements are directly added into the boundary conditions by the discrete additive force Reconstruction, so that the boundary conditions in the immersion boundary accurately meet.The implicit step-by-step method to solve two-dimensional unsteady incompressible Navier-Stokes equations, speed and pressure decoupling to improve computational efficiency.Numerical simulation of a single cylinder around the flow and at different locations By analyzing the flow field vortex structure and the drag coefficient, the delay and inhibition of the small cylinder on the main cylinder vortex shedding are obtained. Comparing with the existing experimental results and numerical results, the calculation error is not More than 5%, indicating that the immersion boundary method can be simple and effective treatment of cylindrical vortex shedding to suppress such flow disturbance problems.