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三维边界层的湍流特性及其二阶矩模拟 被引量:2

Turbulence Behaviour in Three-Dimensional Boundary Layers and Its Second-Moment Modelling
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摘要 根据现有实验数据,本文进一步分析了三维边界层内纵向涡对雷诺应力分布的影响,从而建立了一个足以模拟三维边界层湍流特性的二阶矩封闭模式。在新模式中,着重考虑了三维平均涡场引起的雷诺应力输运的非线性作用。以文[3]给出的模拟无限后掠翼实验为例,本文分别应用基准的二阶矩模式和新建立的非线性二阶矩模式对三维边界层内的雷诺应力分布作了数值预计。结果表明:应用基准二阶矩模式所得雷诺应力诸分量的预计值均比相应的测量值大得多,且完全不能预计切应力方向相对于速度梯度方向的滞后;而非线性二阶矩模式对雷诺应力分布的预计则基本上与测量数据符合,且能定性地模拟切应力方向相对于速度梯度方向的滞后。 An investigation of the effects of longitudinal mean vortic-ity on the Reynolds-stress distribution in a pressure-driven 3D boundary layer is made based on the existing experimental data. A refined second-moment closure is adopted for modelling the main features of the 3D turbulent boundary layer. In setting up the new closure, the attention is paid mainly to capturing the nonlinear effects of a 3D mean vorticity field on the Reynolds-stress development and the increase in dissipation rate of turbulence energy due to vortex stretching, Bradshaw and Pontikos' experiment[3] simulating the flow past an infinite swept wing is taken as the test case for the basic and the refined nonlinear second-moment closures. Computational results show that the prediction of the basic closure greatly overestimates the magnitude of every component of the reynolds-stress tensor giving no deviation of the direction of shear-stress vector from that of velocity-gradient vector, whereas the corresponding prediction of the refined nonlinear . closure is quite agreeable with the experimental data qualitatively reproducing the lag of the shear-stress direction behind the velocity-gradient direction.
机构地区 清华大学
出处 《空气动力学学报》 CSCD 北大核心 1992年第3期347-355,共9页 Acta Aerodynamica Sinica
基金 航天科学与技术基金 中国科学院力学研究所非线性连续介质力学开放研究实验室的资助
关键词 三维边界层 湍流 反掠机翼 3D boundary layer, turbulence, second-moment models ling, swept wing.
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二级参考文献1

  • 1朱自强,空气动力学学报,1983年,1卷

共引文献1

同被引文献22

  • 1Shima N. Journal of Fluid Mechanics . 1988
  • 2Kim J,Moin P,Moser R.Turbulence statistics in fully developed channel flow at low Reynolds number. Journal of Fluid Mechanics . 1987
  • 3So,RMC,Zhang,HS,Speziale,CG. AIAA Journal . 1991
  • 4van den,Berg,B. Procs IUTAM Symp on Three-Dimensional Turbulent Boundary Layers . 1982
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  • 6Moin,P,Shih,TH,Driver,D,Mansour,NN. The Physics of Fluids . 1990
  • 7Lai,YG,So,RMC. Journal of Fluid Mechanics . 1990
  • 8B E Launder and W.C.Reynolds.Asymptotic near-wall stress dissipation rates in a turbulent flow. The Physics of Fluids . 1983
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  • 10Lumley,J. L.,Chia Shun,Yih.Computational Modeling of Turbulent Flows. Advances in Applied Mechanics, Vol. 18 . 1978

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