亚临界雷诺数下圆柱体尾流结构的数值模拟

在典型亚临界雷诺数下,运用基于Smagorinsky亚格子模型的大涡模拟(LES)方法,对均匀来流作用下的圆柱体绕流问题进行三维数值模拟.通过比较基于时间积分的平均积分分量,验证了数值计算结果的准确性,然后分析了尾流区的流场结构,并给出了平均流场以及湍流流场的流场特征.此外,解释了数值结果与早期试验结果间存在微小差异的原因,同时指出回转长度是尾流结构特性中最重要的特征参数.

Numerical Studies of Wake Characteristics on a Circular Cylinder at Sub critical Reynolds Number

At a classical sub critical Reynolds number (Re=3 900), a numerical simulation was performed for the flow over a circular cylinder by large eddy simulation (LES) method with Smagorinsky sub grid model. The mean integral quantities were compared with the existing results to confirm the numerical results. The mean flow and turbulence characteristics were analyzed and the wake structures were performed. In addition, the differences between numerical results and early experimental results were explained and the index effect of the recirculation length was found.