TY - JOUR

T1 - Numerical study of interfacial solitary waves propagating under an elastic sheet

AU - Wang, Zhan

AU - Pãrãu, Emilian I.

AU - Milewski, Paul A.

AU - Vanden-Broeck, Jean-Marc

PY - 2014/8/8

Y1 - 2014/8/8

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=84904011362&partnerID=8YFLogxK

UR - http://dx.doi.org/10.1098/rspa.2014.0111

U2 - 10.1098/rspa.2014.0111

DO - 10.1098/rspa.2014.0111

M3 - Article

AN - SCOPUS:84904011362

VL - 470

JO - Proceedings of the Royal Society A

JF - Proceedings of the Royal Society A

SN - 0080-4630

IS - 2168

M1 - 20140111

ER -