Phase-averaging waveforms of superstructures in outer layer of turbulent boundary layer

Bai Jianxia; Zheng Xiaobo; Jiang Nan

doi:10.11729/syltlx20160064

Volume 30 Issue 5

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Bai Jianxia, Zheng Xiaobo, Jiang Nan. Phase-averaging waveforms of superstructures in outer layer of turbulent boundary layer[J]. Journal of Experiments in Fluid Mechanics, 2016, 30(5): 1-8. doi: 10.11729/syltlx20160064

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Phase-averaging waveforms of superstructures in outer layer of turbulent boundary layer

doi: 10.11729/syltlx20160064

Bai Jianxia^{1, 2
,},
Zheng Xiaobo¹,
Jiang Nan^{1, 3
,
,}

1.
School of Mechanical Engineering, Tianjin University, Tianjin 300354, China
2.
Department of Mechanics, Renai College of Tianjin University, Tianjin 301636, China
3.
Tianjin Key Laboratory of Modern Engineering Mechanics, Tianjin 300350, China

Received Date: 2016-04-18
Rev Recd Date: 2016-06-16
Publish Date: 2016-10-25

Abstract

Abstract

An experimental investigation of the turbulent boundary layer was conducted in a wind tunnel with IFA300 constant temperature anemometer. The simultaneous time series of the streamwise velocity component and the normal velocity component at different wall-normal positions in the turbulent boundary layer were finely measured by a double-sensor X hot-wire probe. The distributions of the turbulence kinetic energy along with the scale were obtained in the near-wall region and the outer region of the turbulent boundary layer through wavelet transform on different velocity components. In the outer region of the turbulent boundary layer, the maximum energy scale and the average burst period of the coherent structure gradually increased. Large-scale vortical structure appeared in the outer region of the turbulent boundary layer. The conditional phase-averaging waveforms of the ejection and sweep events at the maximum energy scale of the coherent structure were extracted by the conditional phase-averaging technique in the near-wall region and the outer region of the turbulent boundary layer. The waveforms of ejection and sweep events in the outer region of the turbulent boundary layer were different from the waveforms in the near-wall region. The amplitude of negative Reynolds shear stress was reduced. The conditional phase-averaging waveforms of Reynolds shear stress presented positive and negative fluctuations.
- turbulent boundary layer,
- superstructures,
- wavelet transform,
- eject

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References(19)

References

[1]	Robinson S K. Coherent motions in the turbulent boundary layer[J]. Annu Rev Fluid Mech, 1991, 23:601-639. doi: 10.1146/annurev.fl.23.010191.003125
[2]	Falco R E. Coherent motions in the outer region of turbulent boundary layers[J]. Phys Fluids, 1977, 20:S124-S132. doi: 10.1063/1.861721
[3]	Hutchins N, Marusic I. Evidence of very long meandering features in the logarithmic region of turbulent boundary layers[J]. J Fluid Mech, 2007, 579:1-28. doi: 10.1017/S0022112006003946
[4]	Hutchins N, Hambleton W T, Marusic I. Inclined cross-stream stereo particle image velocimetry measurements in turbulent boundary layers[J]. J Fluid Mech, 2005, 541:21-54. doi: 10.1017/S0022112005005872
[5]	Adrian R J, Meinhart C D, Tomkins C D. Vortex organization in the outer region of the turbulent boundary layer[J]. J Fluid Mech, 2000, 422:1-54. doi: 10.1017/S0022112000001580
[6]	Liu Z, Adrian R J, Hanratty T J. Large-scale modes of turbulent channel flow:transport and structure[J]. J Fluid Mech, 2001, 448:53-80. https://www.researchgate.net/publication/231971325_Large-scale_modes_of_turbulent_channel_flow_Transport_and_structure
[7]	Kim K C, Adrian R J. Very large-scale motion in the outer layer[J]. Phys Fluids, 1999, 11(2):417-422. doi: 10.1063/1.869889
[8]	Christensen K T, Adrian R J. Statistical evidence of hairpin vortex packets in wall turbulence[J]. J Fluid Mech, 2001, 431:433-443. doi: 10.1017/S0022112001003512
[9]	Natrajan V K, Christensen K T. The role of coherent structures in subgrid-scale energy transfer within the log layer of wall turbulence[J]. Phys Fluids, 2006, 18(6):065104. doi: 10.1063/1.2206811
[10]	Ganapathisubramani B, Hutchins N, Hambleton W T, et al. Investigation of large-scale coherence in a turbulent boundary layer using two-point correlations[J]. J Fluid Mech, 2005, 524:57-80. doi: 10.1017/S0022112004002277
[11]	Wu Y, Christensen K T. Population trends of spanwise vortices in wall turbulence[J]. J Fluid Mech, 2006, 568:55-76. doi: 10.1017/S002211200600259X
[12]	Guala M, Hommema S E, Adrian R J. Large-scale and very-large-scale motions in turbulent pipe flow[J]. J Fluid Mech, 2006, 554:521-542. doi: 10.1017/S0022112006008871
[13]	Farge M. Wavelet transforms and their applications to turbulence[J]. Annu Rev Fluid Mech, 1992, 24:395-457. doi: 10.1146/annurev.fl.24.010192.002143
[14]	Marie Farge, Nicholas Kevlahan, Valerie Perrier. Wavelets and turbulence[J]. Proceedings of the IEEE, 1996, 84(4):639-669. doi: 10.1109/5.488705
[15]	姜楠, 王振东, 舒玮.子波分析辨识壁湍流猝发事件的能量最大准则[J].力学学报, 1997, 29(4):406-412. http://www.cnki.com.cn/Article/CJFDTOTAL-LXXB704.002.htm Jiang N, Wang Z D, Shu W. The maximum energy criterion for identifying burst events in wall turbulence using wavelet analysis[J]. Chinese Journal of Theoretical and Applied Mechanics, 1997, 29(4):406-412. http://www.cnki.com.cn/Article/CJFDTOTAL-LXXB704.002.htm
[16]	Liu J H, Jiang N, Wang Z D, et al. Multi-scale coherent structures in turbulent boundary layer detected by locally averaged velocity structure functions[J]. Applied Mathematics and Mechanics, 2005, 26(4):456-464. http://www.cnki.com.cn/Article/CJFDTOTAL-YYSL200504010.htm
[17]	Zheng X B, Jiang N. Experimental study on spectrum and multi-scale nature of wall pressure and velocity in turbulent boundary layer[J]. Chinese Physics B, 2015, 24(6):064702. doi: 10.1088/1674-1056/24/6/064702
[18]	Del Alamo J C, Jimenez J. Spectra of the very large anisotropic scales in turbulent channels[J]. Phys Fluids, 2003, 15(6):L41-44. doi: 10.1063/1.1570830
[19]	Zhou J, Adrian R J, Balachandar S, et al. Mechanism for generating coherent packets of hairpin vortices in channel flow[J]. J Fluid Mech, 1999, 387:353-396. doi: 10.1017/S002211209900467X