典型文献
Assessment and improvement of k-ω-γ model for separation-induced transition prediction
文献摘要：
The purpose of this work is to improve the k-ω-γ transition model for separation-induced transition prediction.The fundamental cause of the excessively small separation bubble predicted by k-ω-γ model is scrutinized from the perspective of model construction.On the basis,three rectifications are conducted to improve the k-ω-γ model for separation-induced transition.Firstly,a damping function is established via comparing the molecular diffusion timescale with the rapid pressure-strain timescale.The damping function is applied to prevent the effective length scale from incorrect distribution near the leading edge of the separation bubble.Secondly,the pres-sure gradient parameter λζ,is proposed as an indicator for local susceptibility to the separation instability.Additionally,λζ,-based separation intermittency γsep is constructed to accelerate the sub-stantial growth of turbulent kinetic energy after flow separation.The 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 aeroshell.The improved model is strictly based on local variables and Galilean invariance.Besides,the proposed improvement for k-ω-γ model can be fairly convenient to incorporate into other existing intermittency-based transi-tion models.
文献关键词：
中图分类号：
作者姓名：
Yatian ZHAO;Jianqiang CHEN;Rui ZHAO;Hongkang LIU
作者机构：
School of Aeronautics and Astronautics,Central South University,Changsha 410083,China;State Key Laboratory of Aerodynamics,China Aerodynarnics Research and Development Center,Mianyang 621000,China;Computational Aerodynamics Institute,China Aerodynarnics Research and Development Center,Mianyang 621000,China;School of Aerospace Engineering,Beijing Institute of Technology,Beijing 100081,China;Key Laboratory of Traffic Safety on Track of Ministry of Education,School of Traffic&Transportation Engineering,Central South University,Changsha 410075,China
文献出处：
引用格式：
[1]Yatian ZHAO;Jianqiang CHEN;Rui ZHAO;Hongkang LIU-.Assessment and improvement of k-ω-γ model for separation-induced transition prediction)[J].中国航空学报（英文版）,2022(11):219-234
A类：
rectifications,T3L,Aerospatial,decelerator,aeroshell,Galilean
B类：
Assessment,improvement,separation,induced,transition,prediction,purpose,this,work,fundamental,cause,excessively,small,bubble,predicted,by,scrutinized,from,perspective,construction,On,basis,three,are,conducted,Firstly,damping,function,established,via,comparing,molecular,diffusion,timescale,rapid,pressure,strain,applied,prevent,effective,length,incorrect,distribution,near,leading,edge,Secondly,gradient,parameter,proposed,indicator,local,susceptibility,instability,Additionally,intermittency,constructed,accelerate,stantial,growth,turbulent,kinetic,energy,after,flow,improved,appropriate,both,high,speed,has,been,calibrated,against,variety,diverse,challenging,experiments,including,subsonic,plate,airfoil,transonic,NLR,deformed,hypersonic,inflatable,aerodynamic,strictly,variables,invariance,Besides,can,fairly,convenient,incorporate,into,other,existing,models
AB值：
0.550314
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