摘要
提出在湍流边界层近壁区采用三维波的理论模型描述湍流相干结构，根据理论模型计算了Ｒｅｙｎｏｌｄｓ应力输运方程中的脉动速度与脉动压力梯度的相关项，理论计算结果与直接数值模拟（ＤＮＳ）符合很好。表明该理论方法不仅有益于对湍流机制的了解，而且可能为湍流的近壁模型化开辟一条新的途径。
A 3-D wave model for the turbulent coherent structures in near-wall region of a turbulent boundary layer is proposed. In accordance with the theoretical model, the velocity pressure-gradient terms in Reynolds-stress equation are calculated. The theoretical results are in good agreement with those found from DNS in near-wall region. It shows that the theoretical method proposed can correctly embody the physical mechanism of near wall region turbulence and highlights a possibility of opening a new way for near-wall turbulence modeling.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2001年第4期444-446,共3页
Journal of Engineering Thermophysics
基金
国家重点基础研究发展规划项目(No.G1999022305)
航空科学基金资助项目(No.99C51074)
关键词
脉动压力
湍流模型
近壁区
pressure fluctuation
turbulence modeling
coherent structure
Reynolds-stress
near-wall region
