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Oscillatory velocity in boundary layer over mobile sediment bed under asymmetric wave and current conditions
Journal of Hydrodynamics ( IF 2.5 ) Pub Date : 2021-12-27 , DOI: 10.1007/s42241-021-0104-y
Xin Chen 1, 2
Affiliation  

The oscillatory flow provides the major dynamic force for the mass and energy transport in estuary and coastal areas. An analytical approximate velocity formula is proposed to evaluate the oscillation in the boundary layer over the mobile sediment bed of the sheet flow induced by the asymmetric wave and current. The velocity formula consists of an oscillatory force part and a constant force part corresponding to the Navier-Stokes equation of the asymmetric oscillatory sheet flow over the mobile sediment bed. The mobile sediment bed is defined by an erosion depth formula with consideration of the phase lag, the acceleration and the flow asymmetry. The wave part includes the phase lead parameters from all components of the free stream velocity. The development of the wave part is affected by the current part through the erosion depth and the boundary layer thickness. The erosion depth, the roughness height and the boundary layer thickness of the mobile sediment bed are introduced into the current part without a transition area for the wave-current eddy viscosity. The current part is induced by the wave eddy viscosity within the boundary layer and influenced by the wave-current apparent roughness outside the boundary layer. The velocity profile and duration are evaluated by an approximate velocity formula through experiments for both asymmetric wave and wave-current cases. The oscillation feature in the boundary layer is illustrated by the approximate velocity formula through the asymmetric wave cases over the mobile sediment bed.



中文翻译:

非对称波流条件下移动沉积床边界层的振荡速度

振荡流为河口和沿海地区的物质和能量输送提供主要动力。提出了一个解析近似速度公式来评估由非对称波和电流引起的片状流的移动沉积床上方边界层的振荡。速度公式由振荡力部分和恒力部分组成,对应于移动沉积床上非对称振荡片流的 Navier-Stokes 方程。移动沉积床由考虑相位滞后、加速度和流动不对称性的侵蚀深度公式定义。波部分包括来自自由流速度所有分量的相位超前参数。波浪部分的发展通过侵蚀深度和边界层厚度受到流部分的影响。流动沉积层的侵蚀深度、粗糙度高度和边界层厚度被引入到没有波流涡粘性过渡区的流部分。流部分由边界层内的波浪涡粘性引起,并受边界层外波流表观粗糙度的影响。通过对非对称波和波流情况的实验,通过近似速度公式评估速度剖面和持续时间。边界层中的振荡特征通过移动沉积层上的非对称波浪情况的近似速度公式来说明。流动沉积层的粗糙度高度和边界层厚度被引入到没有波流涡粘性过渡区的流部分。流部分由边界层内的波浪涡粘性引起,并受边界层外波流表观粗糙度的影响。通过对非对称波和波流情况的实验,通过近似速度公式评估速度剖面和持续时间。边界层中的振荡特征通过移动沉积层上的非对称波浪情况的近似速度公式来说明。流动沉积层的粗糙度高度和边界层厚度被引入到没有波流涡粘性过渡区的流部分。流部分由边界层内的波浪涡粘性引起,并受边界层外波流表观粗糙度的影响。通过对非对称波和波流情况的实验,通过近似速度公式评估速度剖面和持续时间。边界层中的振荡特征通过移动沉积层上的非对称波浪情况的近似速度公式来说明。流部分由边界层内的波浪涡粘性引起,并受边界层外波流表观粗糙度的影响。通过对非对称波和波流情况的实验,通过近似速度公式评估速度剖面和持续时间。边界层中的振荡特征通过移动沉积层上的非对称波浪情况的近似速度公式来说明。流部分由边界层内的波浪涡粘性引起,并受边界层外波流表观粗糙度的影响。通过对非对称波和波流情况的实验,通过近似速度公式评估速度剖面和持续时间。边界层中的振荡特征通过移动沉积层上的非对称波浪情况的近似速度公式来说明。

更新日期:2021-12-31
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