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黄伟希, 许春晓, 崔桂香, 张兆顺. 壁面展向周期振动的槽道湍流减阻机理的研究[J]. 力学学报, 2004, 36(1). DOI: 10.6052/0459-1879-2004-1-2002-368
引用本文: 黄伟希, 许春晓, 崔桂香, 张兆顺. 壁面展向周期振动的槽道湍流减阻机理的研究[J]. 力学学报, 2004, 36(1). DOI: 10.6052/0459-1879-2004-1-2002-368
MECHANISM OF DRAG REDUCTION BY SPANWISE WALL OSCILLATION IN TURBULENT CHANNEL FLOW[J]. Chinese Journal of Theoretical and Applied Mechanics, 2004, 36(1). DOI: 10.6052/0459-1879-2004-1-2002-368
Citation: MECHANISM OF DRAG REDUCTION BY SPANWISE WALL OSCILLATION IN TURBULENT CHANNEL FLOW[J]. Chinese Journal of Theoretical and Applied Mechanics, 2004, 36(1). DOI: 10.6052/0459-1879-2004-1-2002-368

壁面展向周期振动的槽道湍流减阻机理的研究

MECHANISM OF DRAG REDUCTION BY SPANWISE WALL OSCILLATION IN TURBULENT CHANNEL FLOW

  • 摘要: 利用直接数值模拟研究了带有壁面展向周期振动的槽道湍流. 壁面在展向的周期运动使湍流受到抑制,并使壁面摩擦阻力减小.通过对雷诺应力输运方程的分析研究了壁面展向周期振动的减阻机理,进一步揭示了压力变形项在湍流抑制中的关键作用.

     

    Abstract: An investigation into a turbulent channel flow subjected to spanwisewall oscillation is carried out via direct numerical simulation. By walloscillation, turbulence is suppressed and friction drag is reduced. Thetransportation of Reynolds stresses under the influence of theoscillating wall is analyzed at the initial and statistically stationarystages to further disclose the mechanism of turbulence suppression anddrag reduction. It is found that the moving wall can cause the transientgrowth of spanwise velocity fluctuations only at the very beginning ofwall oscillation and thereafter the pressure-strain terms play animportant role. The attenuation of turbulence intensities and skinfriction at the statistically stationary stage is mainly due to thesustained reduction of the pressure-strain terms.

     

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