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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 18
DEVELOPMENTS IN STRUCTURAL ENGINEERING COMPUTING
Edited by: B.H.V. Topping
Paper VII.3

Dynamics of Submerged Shells of Arbitrary Geometry using Improved Transmitting Boundaries

N. Akkas and K. Tuncay

Department of Engineering Sciences, Middle East Technical University, Ankara, Turkey

Full Bibliographic Reference for this paper
N. Akkas, K. Tuncay, "Dynamics of Submerged Shells of Arbitrary Geometry using Improved Transmitting Boundaries", in B.H.V. Topping, (Editor), "Developments in Structural Engineering Computing", Civil-Comp Press, Edinburgh, UK, pp 265-274, 1993. doi:10.4203/ccp.18.7.3
Abstract
Dynamics of shells of arbitrary geometry submerged in an acoustic medium has attracted attention for many decades. Only a finite region of the infinite fluid domain can be modelled in the numerical analysis. The artificial surface encompassing the finite region is called the truncation surface on which the transmitting boundary condition is used. The classical plane wave, cylindrical wave and spherical wave approximations are the first generation approximations. The Residual Variable Method has made it possible to develop second generation improved transmitting boundary conditions in cartesian, cylindrical and spherical coordinates. A general purpose finite element program, in which both the classical and improved transmitting boundary conditions have been incorporated, has been coded and verified. The response of a point excited submerged ellipsoidal shell is studied. The ellipsoidal shell is enclosed in a spherical truncation surface. The numerical results on the apex deflection are presented and they are compared with that of the spherical shell.

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