| 壁面展向周期振动减阻机理及其二维波谱分析 |
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| 引用本文： | 黄乐萍,范宝春,董刚.壁面展向周期振动减阻机理及其二维波谱分析[J].船舶力学,2010,14(4):325-332. |
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| 作者姓名： | 黄乐萍 范宝春 董刚 |
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| 作者单位： | 南京理工大学瞬态物理实验室,南京,210094;南京理工大学瞬态物理实验室,南京,210094;南京理工大学瞬态物理实验室,南京,210094 |
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| 摘 要： | 利用直接数值模拟(DNS)对壁面作展向周期运动的槽道湍流进行研究,建立了槽道湍流数据库.通过改变振幅大小和振动周期,可以使壁面摩擦阻力明显减少.随着平均减阻率的增加,壁面阻力随时间的变化也更加稳定并呈现出较大周期的变化.将一个典型的阻力变化周期分成三个不同区域进行讨论,对湍流脉动能的二维波谱进行了定量分析,进一步揭示出壁面展向周期振动抑制湍流、实现减阻的内在机理.
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| 关 键 词： | 湍流 直接数值模拟 展向壁面振动 减阻 谱分析 |
Mechanism of turbulent drag reduction with spanwise wall oscillation and spectral analysis of two dimensions |
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| HUANG Le-ping,FAN Bao-chun,DONG Gang.Mechanism of turbulent drag reduction with spanwise wall oscillation and spectral analysis of two dimensions[J].Journal of Ship Mechanics,2010,14(4):325-332. |
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| Authors: | HUANG Le-ping FAN Bao-chun DONG Gang |
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| Institution: | HUANG Le-ping,FAN Bao-chun,DONG Gang(Lab of Transient Physics,Nanjing University of Science and Technology,Nanjing 210094,China) |
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| Abstract: | A turbulent channel flow subjected to spanwise wall oscillation is investigated by direct numerical simulation(DNS).The database of turbulent channel flow is produced by DNS.The friction drag can be reduced significantly by changing the amplitude and the period of the oscillation.Along with the increase of the mean drag reduction rate,time evolution of wall drag becomes steadier and shows longer periodicity.A typical drag reduction periodicity is divided in three areas for analyzing the mechanism of drag re... |
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| Keywords: | turbulence direct numerical simulation spanwise wall oscillation drag reduction spectral analysis |
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