Behaviour of nonlinear two-equation turbulence models at the free-stream edges of turbulent flows

被引：1
|
作者：
Hellsten, A [1 ]
Bézard, H [1 ]
机构：
[1] Helsinki Univ Technol, Lab Aerodynam, FIN-02015 Helsinki, Finland
来源：
Engineering Turbulence Modelling and Experiments 6 | 2005年
关键词：
turbulence modelling; nonlinear two-equation models; free-stream edge; turbulent/nonturbulent interface; model constraints;
D O I：
10.1016/B978-008044544-1/50013-3
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The behaviour of two-equation turbulence models at the outer edges of turbulent flows is studied in this paper. The focus is on nonlinear models with simple scalar-diffusivity gradient-diffusion model for turbulent transport. Conditions to obtain physically correct smooth solutions at the edge are presented and discussed. A constraint is derived for the diffusion model coefficient for turbulent kinetic energy to guarantee smooth solutions also when nonlinear constitutive models are employed. Finally, the analysis is extended to a case of a generalized gradient-diffusion model.
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页码：147 / 156
页数：10
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