Boundary layer dynamics and bottom friction in combined wave–current flows over large roughness elements

Boundary layer dynamics and bottom friction in combined wave–current flows over large roughness elements
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组合波电流流过大粗糙度元素时的边界层动力学和底部摩擦

DOI:
10.1017/jfm.2021.941
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发表时间:
2022
影响因子:
3.7
通讯作者:
Hench, James L.
Hench, James L.
中科院分区:
工程技术2区
文献类型:
--
作者:
Yu, Xiao;Rosman, Johanna H.;Hench, James L.

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在沿海海洋中,波浪和水流的相互作用具有与波浪轨道漂移大小相似的大粗糙度元素,产生阻力并耗散能量。这些边界层动力学与经过充分研究的小尺度粗糙度有很大不同。为了解决这个问题,我们推导了波浪-电流在粗糙底部(包括包含障碍物的冠层)上的组合动量的空间和相位平均方程。这些方程被分解为稳定和振荡部分,以研究波对电流的影响,以及电流对波的影响。我们应用这个框架来分析大涡模拟的半球阵列(直径)上的振荡和稳定组合流动。
In the coastal ocean, interactions of waves and currents with large roughness elements, similar in size to wave orbital excursions, generate drag and dissipate energy. These boundary layer dynamics differ significantly from well-studied small-scale roughness. To address this problem, we derived spatially and phase-averaged momentum equations for combined wave–current flows over rough bottoms, including the canopy layer containing obstacles. These equations were decomposed into steady and oscillatory parts to investigate the effects of waves on currents, and currents on waves. We applied this framework to analyse large-eddy simulations of combined oscillatory and steady flows over hemisphere arrays (diameter .
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