空气动力学学报2017，Vol.35Issue(3)：338-353,16.DOI:10.7638/kqdlxxb-2017.0048
宽速域RANS-LES混合方法的发展及应用
Developments and applications of hybrid RANS-LES methods for wide-speed-range flows
摘要
Abstract
The growing demands of aerospace industry require accurate prediction of unsteady flow details.Current Reynolds averaged Navier-Stokes (RANS) methods are unable to provide dynamic loads for unsteady turbulent flows at high Reynolds numbers, such as massively separated flows past complex geometries.Large eddy simulation (LES) and direct numerical simulation (DNS) are still too expensive for engineering applications.Hybrid RANS-LES methods, combining near-wall RANS regions and outer LES regions, are the most promising techniques for unsteady turbulent flows in engineering.First of all, a general introduction to several categories of hybrid RANS-LES methods was given to discuss their basic ideas and characteristics.Then, the development history of detached-eddy simulation (DES) type methods was presented together with the influences of high-accuracy time-marching methods, spatial discretization schemes and proper numerical dissipation.For both mechanism studies and engineering applications, multiple cases at Mach numbers varying from 0.1 to 20 show that hybrid RANS-LES methods are an ideal choice for the prediction of turbulent flow in engineering.Hybrid RANS-LES methods are capable of predicting complex features involved in massive separation.Future improvement includes the promotion in computation efficiency and embedded RANS/LES strategy for detailed flow past small local component.Big potential also exists for hybrid RANS-LES methods in areas closely related to unsteady flow, such as dynamic stall, combustion and aero-elastics/acoustics/optics.关键词
RANS-LES混合方法/脱体涡模拟/计算流体力学/非定常流动/流动分离/高雷诺数湍流Key words
hybrid RANS-LES methods/detached-eddy simulation/computational fluid dynamics/unsteady flow/separation/turbulence at high reynolds number分类
航空航天引用本文复制引用
肖志祥,罗堃宇,刘健..宽速域RANS-LES混合方法的发展及应用[J].空气动力学学报,2017,35(3):338-353,16.基金项目
国家自然科学基金面上项目(11372159) （11372159）
国家重点研发计划(2016YFA0401200) （2016YFA0401200）
欧盟地平线2020研究创新项目IMAGE(688971) （688971）
