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首页> 外文期刊>European Journal of Mechanics, B. Fluids >Oscillatory boundary layer close to a rough wall
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Oscillatory boundary layer close to a rough wall

机译：靠近粗糙壁的振荡边界层

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摘要

The flow field, generated by an oscillating pressure gradient close to a rough wall, is investigated by means of direct numerical simulations of Navier-Stokes and continuity equations. The wall roughness consists of semi-spheres regularly placed on a plane wall. A comparison of the obtained results with the experimental measurements of Keiller and Sleath [D.C. Keiller, J.F.A. Sleath, Velocity measurements close to a rough plate oscillating in its own plane, J. Fluid Mech. 73 (1976) 673-691] supports the numerical findings. As in Keiller and Sleath [D.C. Keiller, J.F.A. Sleath, Velocity measurements close to a rough plate oscillating in its own plane, J. Fluid Mech. 73 (1976) 673-691], a secondary peak in the streamwise velocity component is observed close to flow reversal and the peak is shown to be generated by the coherent vortex structures which are shed by the roughness elements. The flow is found to be dominated by the shear layers which form at the top of the roughness elements during the accelerating phases of the cycle and by the horse-shoe vortices which form close to the base of the semi-spheres. The dynamics of the shear layers and of the horse-shoe vortices is found to have a relevant influence on the pressure distribution and on the force exerted by the fluid on the roughness elements. The obtained results shed light to the mechanism by which the sediment is picked-up from the bottom by the action of sea waves.
机译：通过Navier-Stokes的直接数值模拟和连续性方程来研究由接近粗糙壁的振荡压力梯度产生的流场。壁粗糙度由规则放置在平面壁上的半球组成。将获得的结果与Keiller和Sleath的实验测量结果进行比较[D.C.凯勒（J.F.A.）泄漏速度测量接近于在其自身平面内振荡的粗糙板，流体力学。 73（1976）673-691]支持数值发现。如在Keiller和Sleath中[D.C.凯勒（J.F.A.）泄漏速度测量接近于在其自身平面内振荡的粗糙板，流体力学。 [J.Eng.Chem.Soc.73（1976）673-691]中，在靠近逆流的方向观察到了沿流速度分量的第二个峰值，并且该峰值显示为由粗糙元素所散布的相干涡结构所产生。发现该流动主要由在循环的加速阶段期间在粗糙度元件的顶部形成的剪切层和在半球的底部附近形成的马蹄形涡旋所主导。发现剪切层和马蹄形涡流的动力学对压力分布以及流体对粗糙度元件的作用力具有重要影响。所获得的结果阐明了通过海浪的作用从底部拾取沉积物的机理。

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