2013
DOI: 10.1088/1674-1056/22/7/074703
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Extraction and verification of coherent structures in near-wall turbulence

Abstract: According to the characteristics of coherent structures in near-wall turbulence, an accurate extraction and verification method is developed based on wavelet transform (WT) and correlation analysis in this paper. At first, the fluid field of a turbulent boundary layer is measured precisely in a gravitational low-speed water tunnel. On the basis of the distribution of the coherent structures, velocity data of three test points are selected and analyzed, whose dimensionless heights are 20.8, 33.5, and 42.6. Acco… Show more

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Cited by 12 publications
(8 citation statements)
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References 20 publications
(12 reference statements)
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“…[4][5][6][7][8][9][10] Active control can adapt to changes in flowing conditions and realize optimal control. [11][12][13][14][15][16][17][18][19] Modern micro-electromechanical systems (MEMS) provide powerful tools for active control. [20,21] Among various active control schemes, wall deformation is a reliable and efficient solution.…”
Section: Introductionmentioning
confidence: 99%
“…[4][5][6][7][8][9][10] Active control can adapt to changes in flowing conditions and realize optimal control. [11][12][13][14][15][16][17][18][19] Modern micro-electromechanical systems (MEMS) provide powerful tools for active control. [20,21] Among various active control schemes, wall deformation is a reliable and efficient solution.…”
Section: Introductionmentioning
confidence: 99%
“…To extract the coherent structures in turbulence, the signals at the central area of turbulence should be selected. According to previous studies [20][21][22], the formation of the coherent structures in turbulence is formed in the area of 0 < y þ < 30, and the self-sustaining of the coherent structures is in the area of 20 < y þ < 60. As a result, three testing positions with the y þ 20.8, 33.5, and 42.6 were selected, whose fluctuating velocity signals are shown in Figure 6.…”
Section: Extraction and Verification Of Turbulent Structuresmentioning
confidence: 99%
“…Coherent structure, i.e., multi-scale quasi-order spatiotemporal structure in a self-sustaining mechanism, plays a key role in the dynamics of the TBL. [1][2][3][4][5][6] Among them, stream-wise vortices near the wall are responsible for high skin friction regions underneath the TBL, [7,8] as shown in Fig. 1.…”
Section: Introductionmentioning
confidence: 99%