The Reynolds number effect from subcritical to high transcritical on steady and unsteady loading on a rough circular cylinder

被引:0
|
作者
van Hinsberg, Nils P. [1 ]
Lueckhof, Jan-Marcus [1 ]
Nuhn, Johannes [1 ]
机构
[1] German Aerosp Ctr, Inst Aeroelast, D-37073 Gottingen, Germany
来源
EURODYN 2014: IX INTERNATIONAL CONFERENCE ON STRUCTURAL DYNAMICS | 2014年
关键词
Rough Cylinder; high Reynolds number; Critical flow; Surface roughness; high-pressure Wind Tunnel; SURFACE-ROUGHNESS; CROSS-FLOW; SMOOTH; RANGE;
D O I
暂无
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Force and surface pressure measurements on a 2D rough circular cylinder were carried out over a wide range of Reynolds numbers in the high-pressure wind tunnel in Gottingen. The Reynolds number spanned values from subcritical up to high transcritical 15x10(3) <= Re <= 12x10(6). The cylinder had a mean relative surface roughness of k(s)/D = 1.2x10(-3). By means of piezoelectric balances the unsteady lift and drag forces were measured. The mean surface pressure distribution was obtained with the use of 59 static surface pressure tabs at various span-wise and circumferential locations on the cylinder. Statistical analysis of the time-dependent forces, in combination with the mean surface pressures, provided information on the spatial organization of the flow field properties around the cylinder as function of the Reynolds number. In the critical Reynolds regime two discontinuities at two separate Reynolds numbers were observed. They were accompanied by critical fluctuations in the lift force and the formation of a separation bubble at each side of the cylinder. The discontinuous jumps were initialized by a downstream movement of the separation point and an upstream movement of the transition point. The asymmetric flow field in-between both critical Reynolds numbers led to a steady lift force that was cancelled again after passing the second critical Reynolds number. At the latter Reynolds number the width of the wake and C-D were minimum. In the super-and transcritical flow states the boundary layer separations took place at about the apex of the cylinder. In comparison to the subcritical and critical regimes all measured flow field properties reached intermediate steady plateaus in the transcritical state. For the Strouhal number this plateaus was at St = 0.23, for the base pressure at C-p,C-base = -0.9 and for the drag coefficient at C-D approximate to -0.84.
引用
收藏
页码:3211 / 3218
页数:8
相关论文
共 50 条
  • [1] The Reynolds number dependency of the steady and unsteady loading on a slightly rough circular cylinder: From subcritical up to high transcritical flow state
    van Hinsberg, Nils Paul
    JOURNAL OF FLUIDS AND STRUCTURES, 2015, 55 : 526 - 539
  • [2] Prediction of unsteady loading on a circular cylinder in high Reynolds number flows using large eddy simulation
    Kim, Sung-Eun
    Mohan, L. Srinivasa
    Proceedings of the 24th International Conference on Offshore Mechanics and Arctic Engineering, Vol 3, 2005, : 775 - 783
  • [3] Steady and unsteady loading on a roughened circular cylinder at Reynolds numbers up to 900,000
    Zan, SJ
    Matsuda, K
    JOURNAL OF WIND ENGINEERING AND INDUSTRIAL AERODYNAMICS, 2002, 90 (4-5) : 567 - 581
  • [4] ON THE FORCE AND VORTEX SHEDDING ON A CIRCULAR-CYLINDER FROM SUBCRITICAL UP TO TRANSCRITICAL REYNOLDS-NUMBERS
    ADACHI, T
    MATSUUCHI, K
    MATSUDA, S
    KAWAI, T
    BULLETIN OF THE JSME-JAPAN SOCIETY OF MECHANICAL ENGINEERS, 1985, 28 (243): : 1906 - 1909
  • [5] Computation of vortex shedding and radiated sound for a circular cylinder: Subcritical to transcritical Reynolds numbers
    Cox, JS
    Brentner, KS
    Rumsey, CL
    THEORETICAL AND COMPUTATIONAL FLUID DYNAMICS, 1998, 12 (04) : 233 - 253
  • [6] Computation of Vortex Shedding and Radiated Sound for a Circular Cylinder: Subcritical to Transcritical Reynolds Numbers
    Jared S. Cox
    Kenneth S. Brentner
    Christopher L. Rumsey
    Theoretical and Computational Fluid Dynamics, 1998, 12 : 233 - 253
  • [7] ON THE SPANWISE CORRELATION OF VORTEX SHEDDING FROM A CIRCULAR-CYLINDER AT HIGH SUBCRITICAL REYNOLDS-NUMBER
    SZEPESSY, S
    PHYSICS OF FLUIDS, 1994, 6 (07) : 2406 - 2416
  • [8] On a circular cylinder in a uniform planar shear flow at subcritical reynolds number
    Sumner, D
    Akosile, OO
    PROCEEDINGS OF THE 5TH INTERNATIONAL SYMPOSIUM ON FLUID STRUCTURE INTERACTION, AEROELASTICITY, FLOW INDUCED VIBRATION AND NOISE, PTS A AND B, 2002, : 283 - 290
  • [9] Field measurements on flow past a circular cylinder in transcritical Reynolds number regime
    Cheng Xiao-Xiang
    Zhao Lin
    Ge Yao-Jun
    ACTA PHYSICA SINICA, 2016, 65 (21)
  • [10] LES-based Study of the Roughness Effects on the Wake of a Circular Cylinder from Subcritical to Transcritical Reynolds Numbers
    Rodriguez, Ivette
    Lehmkuhl, Oriol
    Piomelli, Ugo
    Chiva, Jorge
    Borrell, Ricard
    Oliva, Assensi
    FLOW TURBULENCE AND COMBUSTION, 2017, 99 (3-4) : 729 - 763