确定分布的展向Lorentz力调制下的槽道湍流涡结构

吴文堂; 洪延姬; 范宝春

doi:10.7498/aps.63.054702

摘要

采用直接数值模拟方法，对槽道湍流中确定分布的Lorentz力的流动控制与减阻问题进行研究. 讨论了Lorentz力作用于槽道湍流后，流场的特性和涡结构的特性，并对此类Lorentz力对槽道湍流的控制与减阻机理进行了讨论. 研究发现：1）Lorentz力诱导的层流流场壁面附近存在梯度极大的展向速度剪切层，该剪切层容易形成流向涡结构；2）在给定合适参数的确定分布的Lorentz力作用下，湍流流场仅剩周期分布的准流向涡；3）与未控制流场相比，控制后的流场中，准流向涡的抬升高度大大降低，从而减小猝发强度，使壁面阻力下降.

关键词:

Abstract

Turbulence control and drag reduction in a channel flow by using a steadily distributed spanwise Lorentz force are investigated numerically via a direct numerical simulation (DNS). The characteristics of controlled flow fields and vortex structures are described. Meanwhile, the mechanisms of turbulence suppression and drag reduction by the Lorentz force are also discussed. Calculated results indicate that: (1) The shear layers with a arge gradient of spanwise velocity are created in the laminar boundary layer induced by the spanwise Lorentz force, where the streamwise vortices are easily generated by perturbations. (2) Under the action of the distributed Lorentz force with proper control parameters, only periodically well-organized streamwise vortices are observed in the near-wall region of the turbulent channel flow. (3) After controlling, the averaged lift height of inclined streamwise vortices is reduced significantly as compared with the uncontrolled turbulence flow, resulting in the reduction of the burst strength and subsequent drag reduction on the wall.

Keywords:

作者及机构信息

1.
装备学院, 激光推进及其应用国家重点实验室, 北京 101416;

2.
南京理工大学, 瞬态物理国家重点实验室, 南京 210094

基金项目: 国家自然科学基金（批准号：11172140）资助的课题.

Authors and contacts

1.
National Key Laboratory of Laser Propulsion and Application, Academy of Equipment, Beijing 101416, China;

2.
National Key Laboratory of Transient Physics, Nanjing University of Science and Technology, Nanjing 210094, China

Funds: Project supported by the National Natural Science Foundation of China (Grant No. 11172140).

参考文献

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[23]	Huang L P, Fan B C, Dong G 2010 Phys. Fluids 22 015103
[24]	Kravchenko A G, Choi H, Moin P 1993 Phys. Fluids 5 3307

施引文献

[1]	Kim J 2011 Phil. Trans. R. Soc. A 369 1396
[2]	Hasegawa H, Kasagi N 2011 J. Fluid Mech. 683 57
[3]	Deng B Q, Xu C X 2012 J. Fluid Mech. 710 234
[4]	Ma J, Jin W Y, Yi M, Li Y L 2008 Acta Phys. Sin. 59 6786 (in Chinese) [马军, 靳伍银, 易鸣, 李延龙 2008 物理学报 59 6786]
[5]	David G, Torsten S, Chan Y S 2012 Phys. Fluids 24 077102
[6]	Berger T W, Kim J, Lee C, Lim J 2000 Phys. Fluids 12 631
[7]	Lee C, Kim J 2002 Phys. Fluids 14 2523
[8]	Du Y, Symeonidis V, Karniadakis G E 2002 J. Fluid Mech. 457 1
[9]	Satake S, Kasagi N 1996 Int. J. Heat Fluid Flow 17 343
[10]	Pang J, Choi K S 2004 Phys. Fluids 16 35
[11]	Mei D J, Fan B C, Huang L P, Dong G 2010 Acta Phys. Sin. 59 6786 (in Chinese) [梅栋杰, 范宝春, 黄乐萍, 董刚 2010 物理学报 59 6777]
[12]	Mei D J, Fan B C, Chen Y H, Ye J F 2010 Acta Phys. Sin. 59 8335 (in Chinese) [梅栋杰, 范宝春, 陈耀慧, 叶经方 2010 物理学报 59 8335]
[13]	Mei D J, Fan B C, Chen Y H, Ye J F 2011 Acta Mech. Sin. 43 653 (in Chinese) [梅栋杰, 范宝春, 陈耀慧, 叶经方 2011 力学学报 43 653]
[14]	Zou L Y, Bai J S, Li B Y, Tan D W, Li P, Liu C L 2008 Chin. Phys. B 17 1034
[15]	Lin J Z, Li Jun, Zhang W F 2005 Chin. Phys. 14 2529
[16]	Yang Z X, Cui G X, Xu C X, Zhang Z S, Shao L 2012 Chin. Phys. Lett. 29 054702
[17]	Zhang H Q, Lu H, Wang B, Wang X L 2011 Chin. Phys. Lett. 28 084703
[18]	Huang L P, Fan B C, Mei D J 2012 Theor. Appl. Mech. Lett. 2 012005
[19]	Du Y, Karniadakis G E 2000 Science 288 1230
[20]	Xu P, Choi K S 2007 Flow Control and MEMS (Springer, Berlin) p259
[21]	Huang L P, Fan B C, Dong G 2011 Acta Mech. Sin. 43 277 (in Chinese) [黄乐萍, 范宝春, 董刚 2011 力学学报 43 277]
[22]	Guo C F, Fan B C 2013 J. Ship Mech. 17 336 (in Chinese) [郭春风, 范宝春 2013 船舶力学 17 336]
[23]	Huang L P, Fan B C, Dong G 2010 Phys. Fluids 22 015103
[24]	Kravchenko A G, Choi H, Moin P 1993 Phys. Fluids 5 3307

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