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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >High-order oscillatory contributions to shear stress under standing regular wave groups: Theory and experimental evidence
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High-order oscillatory contributions to shear stress under standing regular wave groups: Theory and experimental evidence

机译：常驻波群对剪切应力的高阶振荡贡献：理论与实验证据

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In this paper, the oscillatory contributions to the steady shear stress of regular wave groups propagating over plane beds in the laminar regime are investigated theoretically and experimentally. Assuming weak nonlinearity, it was found that weak-unsteady motions induced by regular wave groups and second-order harmonics induced by nonlinear bottom boundary layer (BBL) dynamics contribute to the same order. Wave reflection was found to be an additional mechanism to generate high-order contributions to the steady shear stress. High-order oscillatory contributions to the steady shear stress generate small-amplitude perturbations to the steady streaming through the BBL. As a result, steady secondary circulation cells can be distinguished in the wave group—induced BBL. The magnitude and length scale of the measured small-amplitude perturbations are consistent with the theoretical predictions. Moreover, it is shown that the oscillatory contributions are selected according to their characteristic timescale with distance to the bed. The results could have important implications for understanding BBL dynamics and transport and the transition to the perturbed laminar regime in multiple-scale oscillatory flows.
机译：在本文中，从理论和实验上研究了在层流状态下平面波传播的规则波群对稳态切应力的振荡贡献。假设非线性较弱，则发现由规则波群引起的弱非定常运动和由非线性底边界层（BBL）动力学引起的二阶谐波的贡献相同。发现波反射是对稳态剪切应力产生高阶贡献的另一种机制。对稳态剪切应力的高阶振荡贡献对通过BBL的稳态流产生小振幅扰动。结果，可以在波群诱发的BBL中区分出稳定的次级循环细胞。测得的小振幅扰动的大小和长度尺度与理论预测一致。此外，还表明，振荡贡献是根据它们的特征时标随距床的距离而选择的。这些结果可能对理解BBL动力学和输运以及在多尺度振荡流中向扰动层流态的过渡具有重要意义。

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