The velocity and acceleration signatures of small-scale vortices in turbulent channel flow

作者: Kenneth T Christensen ‡ , Ronald J Adrian

DOI: 10.1088/1468-5248/3/1/023

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摘要: Time-resolved particle-image velocimetry measurements are made in the streamwise-wall-normal plane of turbulent channel flow at Re τ = 550 and 1747. Temporal convective derivatives velocity computed from this data order to evaluate small-scale behaviour these quantities as well itself. Instantaneous fields indicate that is dominated by vortex cores believed be associated with hairpin/hairpin-like vortices. These vortices have been observed realizations random other wall turbulence studies. In work, a deterministic ‘vortex signature’ determined conditional averaging techniques. This average signature consistent hairpin defined Adrian co-workers: circular streamlines strong ejection low-speed fluid away (a Q 2 event) just upstream head. addition, spatial extent appears remain relatively cons...

参考文章(13)
M. S. Chong, A. E. Perry, B. J. Cantwell, A general classification of three-dimensional flow fields Physics of Fluids. ,vol. 2, pp. 765- 777 ,(1990) , 10.1063/1.857730
Jinhee Jeong, Fazle Hussain, On the identification of a vortex Journal of Fluid Mechanics. ,vol. 285, pp. 69- 94 ,(1995) , 10.1017/S0022112095000462
R. J. Adrian, Stochastic Estimation of Sub-Grid Scale Motions Applied Mechanics Reviews. ,vol. 43, ,(1990) , 10.1115/1.3120809
P. Henrik Alfredsson, Arne V. Johansson, Time scales in turbulent channel flow Physics of Fluids. ,vol. 27, pp. 1974- 1981 ,(1984) , 10.1063/1.864852
R. J. Adrian, K. T. Christensen, Z.-C. Liu, Analysis and interpretation of instantaneous turbulent velocity fields Experiments in Fluids. ,vol. 29, pp. 275- 290 ,(2000) , 10.1007/S003489900087
R. J. ADRIAN, C. D. MEINHART, C. D. TOMKINS, Vortex organization in the outer region of the turbulent boundary layer Journal of Fluid Mechanics. ,vol. 422, pp. 1- 54 ,(2000) , 10.1017/S0022112000001580
Massimo Germano, Ugo Piomelli, Parviz Moin, William H. Cabot, A dynamic subgrid‐scale eddy viscosity model Physics of Fluids A: Fluid Dynamics. ,vol. 3, pp. 1760- 1765 ,(1991) , 10.1063/1.857955
Reginald J. Hill, S. T. Thoroddsen, Experimental evaluation of acceleration correlations for locally isotropic turbulence Physical Review E. ,vol. 55, pp. 1600- 1606 ,(1997) , 10.1103/PHYSREVE.55.1600
K. T. CHRISTENSEN, R. J. ADRIAN, Statistical evidence of hairpin vortex packets in wall turbulence Journal of Fluid Mechanics. ,vol. 431, pp. 433- 443 ,(2001) , 10.1017/S0022112001003512