Scattering of internal waves by vertical barrier in a channel of stratified fluid

• Autorzy: Dolai P.

Identyfikatory

DOI

10.1515/ijame-2015-0032

• Języki publikacji: EN

Abstrakty

EN

The problem of two dimensional internal wave scattering by a vertical barrier in the form of a submerged plate, or a thin wall with a gap in an exponentially stratified fluid of uniform finite depth bounded by a rigid plane at the top, is considered in this paper. Assuming linear theory and the Boussinesq approximation, the problem is formulated in terms of the stream function. In the regions of the two sides of the vertical barrier, the scattered stream function is represented by appropriate eigen function expansions. By the use of appropriate conditions on the barrier and the gap, a dual series relation involving the unknown elements of the scattering matrix is produced. By defining a function with these unknown elements as its Fourier sine expansion series, it is found that this function satisfies a Carleman type integral equation on the barrier whose solution is immediate. The elements of the scattering matrix are then obtained analytically as well as numerically corresponding to any mode of the incident internal wave train for each barrier configuration. A comparison with earlier results available in the literature shows good agreement. To visualize the effect of the barrier on the fluid motion, the stream lines for an incident internal wave train at the lowest mode are plotted.

Słowa kluczowe

EN

stratified fluid; internal wave; vertical barrier; stream function; scattering matrix; Boussinesq approximation; eigen function expansion

PL

rozwarstwienie; hydromechanika; fala wewnętrzna

• Wydawca: Oficyna Wydawnicza Uniwersytetu Zielonogórskiego
• Czasopismo: International Journal of Applied Mechanics and Engineering
• Rocznik: 2015
• Tom: Vol. 20, no. 3
• Strony: 471--485
• Opis fizyczny: Bibliogr. 8 poz., tab.

Twórcy

autor

Dolai P.

• Department of Mathematics Prasanna Deb Women’s College Jalpaiguri-735101, INDIA

Bibliografia

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• [2] Dolai P. (2011): Diffraction of internal waves by a strip on the surface of a stratified fluid. – Journal of Technology, vol.42, pp.27-47.
• [3] Dolai P. and Dolai D.P. (2013): Internal wave diffraction by a strip of elastic plate on the surface of a stratified fluid. – Int. J. Appl. Mech. Engg., vol.18, No.1, pp.5-26.
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• [6] Krutitsky P.A. (1988): Small non-stationary vibrations of vertical plate in a channel with stratified fluid. – Comput. Maths. Math. Phys, vol.28, pp.1843-1857.
• [7] Larsen L.H. (1969): Internal wave incident upon a knife edge barrier. – Deep Sea Research, vol.16, pp.411-419.
• [8] Mikhlin S.G. (1964): Integral Equations. – New York: Pergamon Press.