Breaking of waves on thin films over topographies
Breaking of waves on thin films over topographies
复制标题
地形上薄膜上的波浪破裂
DOI：
--
复制
发表时间：
2018
期刊：
影响因子：
--
通讯作者：
N. Aksel
中科院分区：
文献类型：
--
作者：
Markus Dauth;N. Aksel
在本研究中，我们进行了实验的演化重力驱动的非线性自由表面波强烈起伏的倾斜。重点研究了激发频率、振幅以及衬底形状和周期性对行波的影响。从而揭示了对流不稳定波振幅演化的现象。我们可以将波的演化分为三类：（1）波的正常指数增长，直到它达到饱和振幅。(2)波的指数增长和波的突然崩溃导致具有饱和振幅的波，该饱和振幅明显小于最大振幅。(3)一个交替的指数增长和波浪的破碎。通过傅里叶分析，我们更详细地研究了波。此外，我们报告（a）选择激发频率的波破碎，（B）的主要影响的稳定状态的自由表面，特别是其平均或整体曲率，（c）气泡的形成发生在波破碎，（d）重叠的波前，和（e）形成的射流在波破碎过程中。我们对重力驱动的非线性自由表面波在强烈起伏斜坡上的演化进行了实验。重点研究了激发频率、振幅以及衬底形状和周期性对行波的影响。从而揭示了对流不稳定波振幅演化的现象。我们可以将波的演化分为三类：（1）波的正常指数增长，直到它达到饱和振幅。(2)波的指数增长和波的突然崩溃导致具有饱和振幅的波，该饱和振幅明显小于最大振幅。(3)一个交替的指数增长和波浪的破碎。通过傅里叶分析，我们更详细地研究了波。此外，我们报告（a）选择激发频率的波破碎，（B）的主要影响的稳定状态的自由表面，特别是其平均或整体曲率，（c）一个...
In the present study, we performed experiments on the evolution of gravity-driven nonlinear traveling free surface waves over strongly undulated inclines. We focused on the impact of the excitation frequency and amplitude and the substrates’ shape and periodicity on the traveling wave. Thereby, we revealed phenomena concerning the amplitude evolution of convectively unstable waves. We can classify the wave evolution in three categories: (1) A normal exponential growth of the wave until it reaches a saturation amplitude. (2) An exponential growth of the wave and an abrupt collapse of the wave leading to a wave with a saturated amplitude, which is sensibly smaller than the maximal amplitude. (3) An alternating exponential growth and breaking of the wave. By using Fourier analysis, we investigated the waves in more detail. Furthermore, we report (a) a selection of excitation frequencies for the wave breaking, (b) a major impact of the steady state free surface, especially its mean or global curvature, (c) a bubble formation occurring at the wave breaking, (d) an overlap of the wave front, and (e) a formation of a jet during wave breaking.In the present study, we performed experiments on the evolution of gravity-driven nonlinear traveling free surface waves over strongly undulated inclines. We focused on the impact of the excitation frequency and amplitude and the substrates’ shape and periodicity on the traveling wave. Thereby, we revealed phenomena concerning the amplitude evolution of convectively unstable waves. We can classify the wave evolution in three categories: (1) A normal exponential growth of the wave until it reaches a saturation amplitude. (2) An exponential growth of the wave and an abrupt collapse of the wave leading to a wave with a saturated amplitude, which is sensibly smaller than the maximal amplitude. (3) An alternating exponential growth and breaking of the wave. By using Fourier analysis, we investigated the waves in more detail. Furthermore, we report (a) a selection of excitation frequencies for the wave breaking, (b) a major impact of the steady state free surface, especially its mean or global curvature, (c) a ...