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首页> 外文会议>International Conference on Fluid Mechanics; 20040720-30; Dalian(CN) >STUDY ON REYNOLDS STRESS TRANSPORTATION IN A TURBULENT CHANNEL FLOW WITH SPANWISE OSCILLATING WALL
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STUDY ON REYNOLDS STRESS TRANSPORTATION IN A TURBULENT CHANNEL FLOW WITH SPANWISE OSCILLATING WALL

机译：平板振荡壁湍流流中雷诺应力传输的研究

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摘要

An investigation of a turbulent channel flow subjected to spanwise wall oscillation is carried out via direct numerical simulation. By wall oscillation, turbulence is suppressed and friction drag is reduced. The transportation of Reynolds stresses under the influence of the oscillating wall is analyzed at the initial and statistically stationary stages to further disclose the mechanism of turbulence suppression and drag reduction. It is found that the moving wall can cause the transient growth of spanwise velocity fluctuations only at the very beginning of wall oscillation and thereafter the pressure-strain terms play an important role. The attenuation of turbulence intensities and skin friction at the statistically stationary stage is mainly due to the sustained reduction of the pressure-strain terms.
机译：通过直接数值模拟研究了翼展方向壁振动引起的湍流通道。通过壁振动，抑制了湍流并减小了摩擦阻力。在初始和统计静止阶段分析了在振动壁的作用下雷诺应力的传递，以进一步揭示湍流抑制和减阻的机理。已经发现，运动壁仅在壁振动刚开始时才能够引起翼展方向速度波动的瞬态增长，其后压力-应变项起着重要的作用。在统计上稳定的阶段，湍流强度和皮肤摩擦的衰减主要是由于压力-应变项的持续减少。

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