雷诺数3 900时三维带齿圆柱流场特征

采用k-ω SST湍流模型对雷诺数为3 900时的三维带齿圆柱展开数值模拟研究，包括升阻力系数、压力系数时均流场特性，以及速度分布、涡量分布等瞬时流场特性。模拟结果表明：绕流流场产生旋涡脱落，在靠近结构壁面的尾流区，流场速度分布呈现V形，在稍远处V形底部趋于平缓，呈现U形，且在带齿圆柱后产生与流动方向相反的速度回流区；在同一时刻下，沿结构展向不同位置处的流动呈现明显的三维特性。

Flow Field Characteristics of Three Dimensional Cylinder with Racks at Re 3 900

The k-ω SST turbulence model is adopted to conduct numerical simulation research on the three-dimensional cylinder with racks at Reynolds number of 3 900, including the characteristics of the time averaged flow field of lift, drag coefficient and pressure coefficient, as well as the instantaneous flow field characteristics such as velocity distribution and vorticity distribution. The simulation results show that: the vortex shedding occurs in the flow field around the structure; in the wake area near the structure, the velocity distribution of the flow field presents a V shape, and the V shape bottom tends to be flat at a little distance, showing a U shape, and a velocity backflow area opposite to the flow direction occurs behind the cylinder with racks; at the same time, the flow along the structure at different locations presents obvious three-dimensional characteristics.