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方案下载应用领域 | 其他 |
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This study deals with the flow motion over the so-called rolling-grain ripples which are generated by water oscillations above a sand bed. We focus our efforts on quantifying by means of laboratory experiments and numerical calculations the morphology and the dynamics of transient flow patterns. We report, for the first time, on the formation of an unsteady pattern with closed streamlines ~we call it ‘‘eddy’’! above rolling-grain ripples using flow visualizations and particle image velocimetry(PIV) measurements. This structure appears in the ripple trough during flow reversal and scales with the ripple wavelength. The experimental results are in qualitative agreement with the perturbative flow solution calculated by Vittori in 1989. Even if the relative ripple amplitude is not small in the experiment the perturbative expansion at the first order gives an accurate description of the flow dynamics.
在一个双稳湍流涡旋火焰中,对间歇性动态的时间-频率定位
Particle-laden Taylor-Couette流:高阶转变和径向局部波浪涡旋的证据
7根杆束的流体-结构相互作用:用实验数据对比数值模拟
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