Effect of surface roughness element on near wall turbulence with zero-pressure gradient
In the present paper, we present an investigation on the effect of roughness elements onto near-wall kinematics of a zero- pressure-gradient turbulent boundary layer. An array of spanwisely-aligned cylindrical roughness elements was attached to the wall surface to regulate the near-wall low-speed st...
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Published in | Science China. Physics, mechanics & astronomy Vol. 58; no. 6; pp. 95 - 102 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
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Beijing
Science China Press
01.06.2015
Springer Nature B.V |
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Abstract | In the present paper, we present an investigation on the effect of roughness elements onto near-wall kinematics of a zero- pressure-gradient turbulent boundary layer. An array of spanwisely-aligned cylindrical roughness elements was attached to the wall surface to regulate the near-wall low-speed streaky structures. With both qualitative visualization and quantitative meas- urement, we found that the regularization only occurs in the region below the height of the roughness elements. Statistical analysis on the probability distribution of the streak spanwise spacing showed that the mean spanwise streak spacing is domi- nated by the roughness elements; however, the latter's effect is in competition with the intrinsic streak generation mechanisms of smooth wall turbulence. Below the top of the roughness elements, local streamwise turbulent fluctuation intensity can be reduced by about 10%. We used POD analysis to depict such regularization effect in terms of near-wall structure modulation. We further found that if the spanwise spacing of roughness elements increased to be larger than the mean streak spacing in the smooth wall turbulence, there is no streak-regularization effect in the buffer region, so that the near-wall streamwise turbulent fluctuation intensity doesn't reduce. |
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AbstractList | In the present paper, we present an investigation on the effect of roughness elements onto near-wall kinematics of a zeropressure- gradient turbulent boundary layer. An array of spanwisely-aligned cylindrical roughness elements was attached to the wall surface to regulate the near-wall low-speed streaky structures. With both qualitative visualization and quantitative measurement, we found that the regularization only occurs in the region below the height of the roughness elements. Statistical analysis on the probability distribution of the streak spanwise spacing showed that the mean spanwise streak spacing is dominated by the roughness elements; however, the latter’s effect is in competition with the intrinsic streak generation mechanisms of smooth wall turbulence. Below the top of the roughness elements, local streamwise turbulent fluctuation intensity can be reduced by about 10%. We used POD analysis to depict such regularization effect in terms of near-wall structure modulation. We further found that if the spanwise spacing of roughness elements increased to be larger than the mean streak spacing in the smooth wall turbulence, there is no streak-regularization effect in the buffer region, so that the near-wall streamwise turbulent fluctuation intensity doesn’t reduce. In the present paper, we present an investigation on the effect of roughness elements onto near-wall kinematics of a zero- pressure-gradient turbulent boundary layer. An array of spanwisely-aligned cylindrical roughness elements was attached to the wall surface to regulate the near-wall low-speed streaky structures. With both qualitative visualization and quantitative meas- urement, we found that the regularization only occurs in the region below the height of the roughness elements. Statistical analysis on the probability distribution of the streak spanwise spacing showed that the mean spanwise streak spacing is domi- nated by the roughness elements; however, the latter's effect is in competition with the intrinsic streak generation mechanisms of smooth wall turbulence. Below the top of the roughness elements, local streamwise turbulent fluctuation intensity can be reduced by about 10%. We used POD analysis to depict such regularization effect in terms of near-wall structure modulation. We further found that if the spanwise spacing of roughness elements increased to be larger than the mean streak spacing in the smooth wall turbulence, there is no streak-regularization effect in the buffer region, so that the near-wall streamwise turbulent fluctuation intensity doesn't reduce. |
Author | ZHANG Xin PAN Chong SHEN JunQi WANG JinJun |
AuthorAffiliation | School of Aeronautic, Northwestern Polytechnical University, Xi'an 710072, China; Fluid Mechanics Key Laboratory of Ministry of Education, Beijing University of Aeronautics and Astronautics, Beijing 100191, China |
Author_xml | – sequence: 1 givenname: Xin surname: Zhang fullname: Zhang, Xin organization: School of Aeronautic, Northwestern Polytechnical University – sequence: 2 givenname: Chong surname: Pan fullname: Pan, Chong email: panchong@buaa.edu.cn organization: Fluid Mechanics Key Laboratory of Ministry of Education, Beijing University of Aeronautics and Astronautics – sequence: 3 givenname: JunQi surname: Shen fullname: Shen, JunQi organization: Fluid Mechanics Key Laboratory of Ministry of Education, Beijing University of Aeronautics and Astronautics – sequence: 4 givenname: JinJun surname: Wang fullname: Wang, JinJun organization: Fluid Mechanics Key Laboratory of Ministry of Education, Beijing University of Aeronautics and Astronautics |
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CitedBy_id | crossref_primary_10_1080_00268976_2021_1969600 crossref_primary_10_1016_j_proeng_2015_11_186 crossref_primary_10_2514_1_J056886 crossref_primary_10_3390_computation3030386 |
Cites_doi | 10.1063/1.1521124 10.1088/0957-0233/24/5/055305 10.1017/S0022112067001740 10.1017/S002211200100667X 10.1063/1.869185 10.1017/S0022112002003270 10.1063/1.1320833 10.1038/41966 10.1007/s00348-011-1152-9 10.1007/s12650-010-0063-9 10.1063/1.868605 10.1017/S0022112089002892 10.1017/S0022112003005251 10.1063/1.3540679 10.1016/S0169-5983(00)00009-5 10.1080/00221689309498862 10.1088/0256-307X/29/10/104704 10.1103/PhysRevLett.96.064501 10.1017/S0022112083000634 10.1007/s11433-009-0033-1 10.1007/s003480070007 |
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Notes | turbulent coherent structures, low-speed streak, flow control 11-5849/N In the present paper, we present an investigation on the effect of roughness elements onto near-wall kinematics of a zero- pressure-gradient turbulent boundary layer. An array of spanwisely-aligned cylindrical roughness elements was attached to the wall surface to regulate the near-wall low-speed streaky structures. With both qualitative visualization and quantitative meas- urement, we found that the regularization only occurs in the region below the height of the roughness elements. Statistical analysis on the probability distribution of the streak spanwise spacing showed that the mean spanwise streak spacing is domi- nated by the roughness elements; however, the latter's effect is in competition with the intrinsic streak generation mechanisms of smooth wall turbulence. Below the top of the roughness elements, local streamwise turbulent fluctuation intensity can be reduced by about 10%. We used POD analysis to depict such regularization effect in terms of near-wall structure modulation. We further found that if the spanwise spacing of roughness elements increased to be larger than the mean streak spacing in the smooth wall turbulence, there is no streak-regularization effect in the buffer region, so that the near-wall streamwise turbulent fluctuation intensity doesn't reduce. ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
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Snippet | In the present paper, we present an investigation on the effect of roughness elements onto near-wall kinematics of a zero- pressure-gradient turbulent boundary... In the present paper, we present an investigation on the effect of roughness elements onto near-wall kinematics of a zeropressure- gradient turbulent boundary... |
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SubjectTerms | Astronomy Boundary layers Classical and Continuum Physics Fluid dynamics Fluid flow Kinematics Low speed Observations and Techniques Physics Physics and Astronomy Probability distribution Regularization Roughness Statistical analysis Streak Surface roughness Surface roughness effects Turbulence Turbulent boundary layer Turbulent flow Walls 元素 压力梯度 条纹间距 湍流边界层 脉动强度 表面粗糙度 运动效果 近壁湍流 |
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Title | Effect of surface roughness element on near wall turbulence with zero-pressure gradient |
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