A combined direct numerical simulation-particle image velocimetry study of the turbulent near wake

被引:265
作者
Dong, S.
Karniadakis, G. E. [1 ]
Ekmekci, A.
Rockwell, D.
机构
[1] Brown Univ, Div Appl Math, Providence, RI 02912 USA
[2] Lehigh Univ, Dept Mech Engn, Bethlehem, PA 18015 USA
关键词
D O I
10.1017/S0022112006002606
中图分类号
O3 [力学];
学科分类号
08 ; 0801 ;
摘要
We investigate the near wake of a cylinder at values of Reynolds number corresponding to the onset and development of shear-layer instabilities. By combining quantitative experimental imaging (particle image velocimetry, PIV) and direct numerical simulations at Re = 3900/4000 and 10000, we show that the flow structure is notably altered. At higher Reynolds number, the lengths of both the wake bubble and the separating shear layer decrease substantially. Corresponding patterns of velocity fluctuations and Reynolds stress contract towards the base of the cylinder. The elevated values of Reynolds stress at upstream locations in the separated layer indicate earlier onset of shear-layer transition. These features are intimately associated with the details of the shear-layer instability, which leads to small-scale vortices. The simulated signatures of the shear-layer vortices are characterized by a broadband peak at Re = 3900 and a broadband high spectral-density 'plateau' at Re = 10000 in the power spectra. The shear-layer frequencies from the present direct numerical simulations study agree well with previous experimentally measured values, and follow the power law suggested by other workers.
引用
收藏
页码:185 / 207
页数:23
相关论文
共 51 条
[1]  
[Anonymous], TF62 STANDF U DEP ME
[2]  
[Anonymous], 1993, THESIS CALTECH
[3]   CHAOTIC TRANSPORT IN 2-DIMENSIONAL AND 3-DIMENSIONAL FLOW PAST A CYLINDER [J].
BATCHO, P ;
KARNIADAKIS, GE .
PHYSICS OF FLUIDS A-FLUID DYNAMICS, 1991, 3 (05) :1051-1062
[4]   LIFT + DRAG FORCES ON CIRCULAR CYLINDER IN FLOWING FLUID [J].
BISHOP, RED ;
HASSAN, AY .
PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL AND PHYSICAL SCIENCES, 1964, 277 (1368) :32-+
[5]   THE TRANSITION TO TURBULENCE IN THE WAKE OF A CIRCULAR CYLINDER [J].
BLOOR, MS .
JOURNAL OF FLUID MECHANICS, 1964, 19 (02) :290-&
[6]   PREDICTION OF LARGE-SCALE TRANSITION FEATURES IN THE WAKE OF A CIRCULAR-CYLINDER [J].
BRAZA, M ;
CHASSAING, P ;
MINH, HH .
PHYSICS OF FLUIDS A-FLUID DYNAMICS, 1990, 2 (08) :1461-1471
[7]   Measurement of turbulence production in the cylinder separated shear-layer using event-triggered Laser-Doppler anemometry [J].
Brede, M .
EXPERIMENTS IN FLUIDS, 2004, 36 (06) :860-866
[8]   A challenging test case for large eddy simulation: high Reynolds number circular cylinder flow [J].
Breuer, M .
INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW, 2000, 21 (05) :648-654
[9]   Numerical and modeling influences on large eddy simulations for the flow past a circular cylinder [J].
Breuer, M .
INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW, 1998, 19 (05) :512-521
[10]   Near-wake structure of an oscillating cylinder: Effect of controlled shear-layer vortices [J].
Chyu, CK ;
Rockwell, D .
JOURNAL OF FLUID MECHANICS, 1996, 322 :21-49