Numerical study of interfacial solitary waves propagating under an elastic sheet.

Numerical study of interfacial solitary waves propagating under an elastic sheet.
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在弹性片下传播的界面孤立波的数值研究。

DOI:
10.1098/rspa.2014.0111
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发表时间:
2014-08-08
期刊:
Proceedings. Mathematical, physical, and engineering sciences
影响因子:
--
通讯作者:
Vanden-Broeck JM
Vanden-Broeck JM
中科院分区:
其他
文献类型:
--
作者:
Wang Z;Părău EI;Milewski PA;Vanden-Broeck JM

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本文将上层流体位于柔性弹性薄板下的二流体问题的定常孤立波和广义孤立波作为冰盖下内波的模型。流体由两层恒定密度组成,由界面分隔。弹性板抵抗弯曲力,并在数学上由完全非线性薄壳模型描述。完全本地化孤立波计算通过边界积分方法。沿着解的各个分支的进展表明,正压(即表面模式)波包孤立波分支以接近界面的自由表面结束。另一方面,长斜压(即内部)孤立波的极限配置的特点是在水平方向上的无限扩大。斜压波包模式也存在一个大范围的振幅和广义孤立波计算的情况下,长的内部模式与表面模式的共振。与纯引力情况(即没有弹性覆盖)相比,这些广义孤立波在远场表现出新的Wilton波纹状周期序列。
Steady solitary and generalized solitary waves of a two-fluid problem where the upper layer is under a flexible elastic sheet are considered as a model for internal waves under an ice-covered ocean. The fluid consists of two layers of constant densities, separated by an interface. The elastic sheet resists bending forces and is mathematically described by a fully nonlinear thin shell model. Fully localized solitary waves are computed via a boundary integral method. Progression along the various branches of solutions shows that barotropic (i.e. surface modes) wave-packet solitary wave branches end with the free surface approaching the interface. On the other hand, the limiting configurations of long baroclinic (i.e. internal) solitary waves are characterized by an infinite broadening in the horizontal direction. Baroclinic wave-packet modes also exist for a large range of amplitudes and generalized solitary waves are computed in a case of a long internal mode in resonance with surface modes. In contrast to the pure gravity case (i.e without an elastic cover), these generalized solitary waves exhibit new Wilton-ripple-like periodic trains in the far field.
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