Characteristics of breaking vorticity in spilling and plunging waves investigated numerically by SPH
Characteristics of breaking vorticity in spilling and plunging waves investigated numerically by SPH
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DOI：
10.1007/s10652-019-09699-5
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发表时间：
2019-06
影响因子：
2.2
通讯作者：
D. De Padova;M. Ben Meftah;F. De Serio;M. Mossa;S. Sibilla
中科院分区：
文献类型：
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作者：
D. De Padova;M. Ben Meftah;F. De Serio;M. Mossa;S. Sibilla
本文重点研究波浪破碎引起的涡度，它对沉积物的拾取和悬浮以及波浪界面处的空气-水交换有很大贡献，因此值得深入研究。该范围采用了弱可压缩平滑粒子 (WCSPH) 模型以及湍流应力的二方程模型。首先根据在倾斜波通道中进行的实验，特别是使用波高程和速度数据，对 SPH 的数值参数进行了仔细校准。在证明了模型的可靠性后，对溢流波和暴落波两种情况下破裂前和破裂后引起的涡度特性进行了数值研究。主要和详细的结果表明，对于这两种类型的破碎机，在流向流动减速和涡度产生之间都存在因果关系。
The present paper, places emphasis on the vorticity induced by wave breaking, which greatly contributes to sediments pick up and suspension as well as to air–water exchange at the wave interface, thus deserving a thorough study. A weakly-compressible smoothed particle (WCSPH) model, coupled with a two-equation model for turbulent stresses, has been employed for this scope. A careful calibration of the SPH’s numerical parameters has been first performed, based on experiments carried out in a sloped wave channel, specifically using wave elevation and velocity data. Once proved the reliable performance of the model, the characteristics of vorticity induced just prior and post breaking for both the cases of a spilling and a plunging wave have been numerically studied. The main and detailed results indicate that for both the types of breakers there is a cause-effect relation observed between the stream wise flow deceleration and the vorticity generation.