壁面局部粗糙对大涡结构作用的非线性演化研究

摘要

在构建大涡结构理论模型的基础上,采用局部喷入和吸出的结构来模拟局部粗糙壁面诱导的感应扰动场,数值研究局部粗糙对大涡结构之间非线性作用的影响问题.数值结果表明,局部粗糙壁面诱导的感应扰动改变了原平均速度剖面的稳定性特性及感应扰动流场的三维性对激励大涡结构的快速增长起了关键性的作用.%Based on a theoretical model for large eddy structure.the basic disturbance flow induced by the localized rough wall was simulated by distributing localized suction and blowing,to investigate the nonlinear effect of the local roughness on the large eddy structure.Numerical results show that the sta-bility of the basic velocity profile is changed by the basic disturbance flow induced by localized rough wall,and the three-dimensionality of the basic disturbance flow plays a key role in the rapidly growth of the large eddy structure.