不同亚格子模型的对比分析及其运用  

A Comparison of the Different Subgrid-Scale Models and Its Application

作　　者：俞建阳[1] 王若玉[1] 陈浮[1] 宋彦萍[1] 

机构地区：[1]哈尔滨工业大学能源科学与工程学院,哈尔滨150001

出　　处：《工程热物理学报》2016年第11期2311-2318,共8页Journal of Engineering Thermophysics

基　　金：国家自然科学基金委创新研究群体基金(No.51121004);国家自然科学基金(No.50976026)

摘　　要：本文基于大涡模拟方法,对比讨论了四种不同亚格子模型的计算原理和仿真特性,并对等离子体激励下的凸包流场进行了研究,结果表明:WALE模型和KET模型的仿真结果比较准确;Smagorinsky-Lilly模型耗散偏大且模型系数不具普适性,仿真准确性较差;WMLES模型存在严重的过度耗散,各流动参数的仿真结果误差很大,无法准确捕捉流动转捩的发生;等离子体激励通过向附面层流体注入能量产生等效的壁面射流,可以显著延缓凸包流动分离并促进流动再附、抑制涡的发生,从而起到降低耗散,湍流减阻的作用。Four different Subgrid-Scale models were employed in the study of flow over a wall-mounted hump and then the most capable one was used in flow control with the DBD plasma in this work. The results show that the WALE model and the KET model demonstrate good qualitative agreement with the experimental data The Smagorinsky-Lilly displays some shortage in the simulation, while more dissipations and the disability in capture the transition in the boundary layer are found in the WMLES model. A wall jet shows up in near wall region when the DBD plasma is applied in the flow. It would lead to the delay of the flow separation the happen of the reattachment in advance and the restraining of the spanwise vorticity Therefore, the DBD plasma actuator has been demonstrated to have the ability in dissipation decrease and turbulent drag reduction.

关 键 词：大涡模拟 亚格子模型 等离子体 流动控制 

分 类 号：TV131.2[水利工程—水力学及河流动力学]