摘要
采用高精度谱单元方法(spectral element method,SEM)对Re=3900下圆柱绕流和Re=5300下圆管湍流进行直接数值模拟(direct numerical simulation,DNS),将结果与大涡模拟结果(large eddy simulation,LES)、基于有限体积法(finite volume method,FVM)的DNS结果以及实验结果进行了对比分析。对圆柱绕流的量化分析结果显示,尾流中心线处流向平均速度的SEM计算结果与实验结果基本吻合,而LES方法则低估了回流区最大速度并高估了离圆柱较远区域流向速度的协方差。另一方面,圆管湍流的对比结果显示,SEM法结果与FVM法结果在一阶统计量上基本吻合,而在二阶统计量上则略有差异,表现为FVM方法结果的流向雷诺正应力预测值偏大,而环向与径向预测值偏小。
Based on spectral element method,we performed direct numerical simulations of flow over a circular cylinder and turbulence in pipe with Reynolds number equals to 3900 and 5300,respectively.Also,the results are compared with the existing database acquired by large eddy simulation and finite volume element and also experiments.The comparison shows that,for cylinder wake,present results agree well with experiments,but the results of large eddy simulation underestimate the maximum velocity in recirculation zone and overvalue the variance of streamwise velocity in the wake centerline.Besides,some experiments underestimate the scale of recirculation zone.For turbulence in pipe,in terms of firstorder statistics,present results agree well with the results of finite volume element method,but differ in second-order statistics.It is manifested that the results of finite volume method are larger than present results in streamwise Reynolds stress,but smaller in radial and circumferential Reynolds stresses.Both results shows little difference with the experimental results.
作者
刘旭
闫亭
包艳
Liu Xu;Yan Ting;Bao Yan(Department of Civil Engineering,School of Naval Architecture,Ocean and Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《科技通报》
2020年第5期13-19,共7页
Bulletin of Science and Technology
基金
国家自然科学基金资助项目(Nos.51679139,11772193)