Gravity-capillary lumps generated by a moving pressure source.
Gravity-capillary lumps generated by a moving pressure source.
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DOI：
10.1103/physrevlett.103.214502
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发表时间：
2009-09
影响因子：
8.6
通讯作者：
J. Diorio;Yeunwoo Cho;J. Duncan;T. Akylas
中科院分区：
文献类型：
--
作者：
J. Diorio;Yeunwoo Cho;J. Duncan;T. Akylas
本文从实验和理论上研究了局部压力源以低于线性重力-毛细波的最小相速（c{min}）的速度在液体自由表面上运动时产生的非线性波型。在这些速度下，自由传播的完全局部化的孤立波，或“块”，在理论上是可能的。对于远低于c{min}的压力源速度，表面响应是与没有前进速度的情况类似的局部凹陷。随着速度的增加，达到临界值c{c}约0.9c{min}，其中存在到波状状态的突然过渡，其特征在于类似于压力强迫后面的陡峭块的稳定扰动。当速度接近c{min}时，发现第二个过渡;新的状态是不稳定的，其特征在于从V形图案的尖端连续脱落团块。
The nonlinear wave pattern generated by a localized pressure source moving over a liquid free surface at speeds below the minimum phase speed (c{min}) of linear gravity-capillary waves is investigated experimentally and theoretically. At these speeds, freely propagating fully localized solitary waves, or "lumps," are known theoretically to be possible. For pressure-source speeds far below c{min}, the surface response is a local depression similar to the case with no forward speed. As the speed is increased, a critical value is reached c{c} approximately 0.9c{min} where there is an abrupt transition to a wavelike state that features a steady disturbance similar to a steep lump behind the pressure forcing. As the speed approaches c{min}, a second transition is found; the new state is unsteady and is characterized by continuous shedding of lumps from the tips of a V-shaped pattern.