Assessment and improvement of k-ω-γ model for separation-induced transition prediction

作     者：Yatian ZHAO Jianqiang CHEN Rui ZHAO Hongkang LIU Yatian ZHAO;Jianqiang CHEN;Rui ZHAO;Hongkang LIU

作者机构：School of Aeronautics and AstronauticsCentral South UniversityChangsha 41083China State Key Laboratory of AerodynamicsChina Aerodynamics Research and Development CenterMianyang 621000China Computational Aerodynamics InstituteChina Aerodynamics Research and Development CenterMianyang 621000China School of Aerospace EngineeringBejing Institute of TechnologyBeijing 100081China Key Laboratory of Traffic Safety on Track of Ministry of EducationSchool of Traffic&Transportation EngineeringCentral South UniversityChangsha 410075China 

出 版 物：《Chinese Journal of Aeronautics》 (中国航空学报（英文版）)

年 卷 期：2022年第35卷第11期

页      面：219-234页

核心收录：

学科分类：080103[工学-流体力学] 08[工学] 080104[工学-工程力学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：supported by the National Natural Science Foundation of China(Nos.11902367 and 12002355) the State Key Laboratory of Aerodynamics,China(No.SKLA20200202) the National Natural Science Foundation of Hunan Province,China(No.S2021JJQNJJ2716) upported in part by the High Performance Computing Center of Central South University 

主　　题：Boundary layer transition Intermittency Local variables Separation bubble Transition model 

摘      要：The purpose of this work is to improve the k-ω-γtransition model for separationinduced transition *** fundamental cause of the excessively small separation bubble predicted by k-ω-γmodel is scrutinized from the perspective of model *** the basis,three rectifications are conducted to improve the k-ω-γmodel for separation-induced ***,a damping function is established via comparing the molecular diffusion timescale with the rapid pressure-strain *** damping function is applied to prevent the effective length scale from incorrect distribution near the leading edge of the separation ***,the pressure gradient parameterλζ,is proposed as an indicator for local susceptibility to the separation ***,λζ,-based separation intermittencyγsep is constructed to accelerate the substantial growth of turbulent kinetic energy after flow *** improved model appropriate for both low-and high-speed flow has been calibrated against a variety of diverse and challenging experiments,including the subsonic T3L plate,Aerospatial A airfoil,transonic NLR-7301 airfoil and deformed hypersonic inflatable aerodynamic decelerator *** improved model is strictly based on local variables and Galilean ***,the proposed improvement for k-ω-γmodel can be fairly convenient to incorporate into other existing intermittency-based transition models.