On the Mechanism of Turbulent Coherent Structure(Ⅱ)──A Physical Model of Coherent Structure for the Rough Boundary Layer

Liu Yulu; Cai Shutang

Volume 17 Issue 3

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Article Navigation > Applied Mathematics and Mechanics > 1996 > 17(3): 189-195

Liu Yulu, Cai Shutang. On the Mechanism of Turbulent Coherent Structure(Ⅱ)──A Physical Model of Coherent Structure for the Rough Boundary Layer[J]. Applied Mathematics and Mechanics, 1996, 17(3): 189-195.

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On the Mechanism of Turbulent Coherent Structure(Ⅱ)──A Physical Model of Coherent Structure for the Rough Boundary Layer

Shanghai Int. of Appl. Math. and Mech., Shanghai University, Shanghai 200072, P. R. China

Received Date: 1995-04-03
Publish Date: 1996-03-15

Abstract

Abstract

In this paper,the differences of turbulent coherent structure beween the smooth and rough boundary lavers are analysed.Based on the discussing the transient properties from the smooth wall tothe rough wall,the physicalmodel of coherent structure for the rough boundary layer are established.The width of slwly-moving turbulent spot and the bursting time are obtained,which are in agreement with experimental results.
- turbulent theory,
- coherent structure,
- rough boundary layer,

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References(5)

References

[1]	S.J.Kline et al.,The structure of turbulent boundary layers.J.Fluid Mech.,30(1967).741-773.
[2]	H.T.Kim et al.,The production of turbulence near a smooth wall in a turbulent boundary layer.J.Fluid Mech.50(1971).133.
[3]	Z.C.Liana and S.H.Liu.Effects of wall rouehness on the coherent structure in turbulent shear flows.J.Hydrodynamics.1(1989).15-22.
[4]	P.G.Saffman.the lift on a small sphere in a shear flow.J.Fluid.Mech,22.(1965).385-400.
[5]	蔡树棠、刘宇陆,湍流相干结构的机理研究(Ⅰ)——光滑壁面边界层相干结构的物理模型,应用数学和力学,16(4)(1995).

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