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首页> 外文期刊>Journal of Fluid Mechanics >A particle image velocimetry investigation on laboratory surf-zone breaking waves over a sloping beach
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A particle image velocimetry investigation on laboratory surf-zone breaking waves over a sloping beach

机译:倾斜海滩上实验室冲浪区破碎波的粒子图像测速研究

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摘要

Particle image velocimetry (PIV) measurements were performed in a wave tank under water waves propagating and breaking on a 1115 sloping beach. The wave transformation occurred in the surf zone over a large domain covering several wavelengths from incipient breaking to swash zone beyond the shoreline. PIV spatial interrogation windows must be small enough to obtain accurate velocities, and one window covers only a small part of the domain. To overcome this problem and to measure the instantaneous velocity field over the whole surf zone area, we have split the full field into 14 overlapping smaller windows of the same size. Local measurements were synchronized with each other using pulsed TTL triggers and wave gauge data. The full velocity field was then reconstructed at every time step by gathering the 14 PIV fields. We then measured the complete space-time evolution of the velocity field over the whole surf zone. We determined also the ensemble-period-average and phase-average components of the flow with their associated fluctuating parts. We used the PIV images and velocity measurements to estimate the void fraction in each point of the surf zone. Special attention was given to the calculation of the spatial derivatives in order to obtain relevant information on vorticity and on the physical terms that appear in the fluctuating kinetic energy transport equation.
机译:粒子图像测速(PIV)测量是在水箱中在1115倾斜海滩上传播和破裂的水波下进行的。波浪的变化发生在一个大区域的海浪区域中,覆盖了从初始断裂到海岸线以外的斜波带的几个波长。 PIV空间询问窗口必须足够小以获得准确的速度,并且一个窗口仅覆盖域的一小部分。为了克服这个问题并测量整个冲浪区的瞬时速度场,我们将整个场分成了14个相同大小的重叠小窗口。使用脉冲TTL触发和波形仪数据使本地测量彼此同步。然后通过收集14个PIV场在每个时间步重建全速度场。然后,我们测量了整个冲浪区上速度场的完整时空演化。我们还确定了流的集合周期平均和相位平均分量及其相关的波动部分。我们使用PIV图像和速度测量来估计冲浪区每个点的空隙率。为了获得有关涡度和波动动能传输方程中出现的物理项的相关信息,对空间导数的计算给予了特别关注。

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