Results 111 to 120 of about 20,239 (157)

A NURBS Panel Method for Three-Dimensional Radiation and Diffraction Problems

Journal of Ship Research, 2003
A B-spline panel method is developed to solve a boundary integral equation for three-dimensional potential flow problems. In particular, a nonuniform rational B-spline (NURBS) surface is introduced to accommodate a precise geometric description of a given body.
Booki Kim, Yung S. Shin
openaire   +1 more source

A direct boundary-element method for three-D wave diffraction and radiation problems

Ocean Engineering, 1988
Abstract Three-dimensional analytical procedures are developed for determining the wave-exciting and motion-induced hydrodynamic forces for fixed and floating ocean structures in a fluid of finite or infinite depth. The fluid potential is expressed by means of a Helmholtz integral, which involves the normal fluid velocities at the fluid-structure ...
Chih-Kang Lee, Jack Y.K. Lou
openaire   +1 more source

On diffraction and radiation problem for two cylinders in water of finite depth

Ocean Engineering, 2006
The hydrodynamic problem arising form the interaction of linear water waves with a wave energy device consisting of two coaxial vertical cylinders of different radii is investigated. One cylinder is riding in waves, while another is submerged in fluid.
Wu, BJ, Zheng, YH, You, YG, Jie, DS, Chen, Y   +4 more
openaire   +2 more sources

Mathematical models of diffraction and radiation problems for planar waveguide with impedance flange

MMET '96. VIth International Conference on Mathematical Methods in Electromagnetic Theory. Proceedings, 2002
The problem of diffraction and radiation for a planar semibounded waveguide with ideally conducting sides and flange has been solved by different methods more than once. In this work the problem is considered in the impedance flange case. The derivation of a singular integral equation is demonstrated in the radiation problem case.
Y. Gandel, N. Morozova
openaire   +1 more source

A comparison of localized finite element formulations for two‐dimensional wave diffraction and radiation problems

International Journal for Numerical Methods in Engineering, 1981
AbstractTwo of the most promising localized finite element methods are compared: the boundary series element method, in which a series of eigenfunctions is used to represent the far field solution; and the boundary integral element method, in which an integral equation is satisfied at the boundary between localized finite element and outer regions. The
Taylor, R. Eatock, Zietsman, J.
openaire   +2 more sources

Rays, Dispersion Surfaces and Their Uses for Radiation and Diffraction Problems

SIAM Review, 1970
In certain asymptotic parameter regimes, propagation, radiation and diffraction processes in a linear field may be described locally in terms of plane waves and schematized in terms of rays. Properties of space-time rays descriptive of time-dependent fields in lossless dispersive, isotropic or anisotropic media, and corresponding features of time ...
openaire   +1 more source

Pre-wave zone effect in transition and diffraction radiation: Problems and solutions

Physics Letters A, 2005
Transition radiation (TR) and diffraction radiation (DR) appearing as a result of dynamic polarization of medium has widely been used for electron beam diagnostics during the last few years. A lot of techniques for electron beam diagnostics imply description of these phenomena assuming that the radiated area of the target is negligibly small in ...
openaire   +1 more source

Note on a general relation between diffraction and radiation problems in acoustics

The Journal of the Acoustical Society of America, 1977
A general relation between the farfield amplitudes of the diffraction and the radiation problems by a rigid body is deduced.
openaire   +1 more source

Debye and Debye-type potentials in diffraction, radiation and elastic wave propagation problems

Acoustical Physics, 2012
Various representations of the vector potential $$\vec A$$ of displacement vector $$\vec u$$ in terms of the Debye and Debye-type potentials are considered for elastic ...
openaire   +1 more source

A time-domain higher-order boundary element method for 3D forward-speed radiation and diffraction problems

Journal of Marine Science and Technology, 2013
A time-domain higher-order boundary element method for seakeeping analyses in the framework of linear potential theory is newly developed. Ship waves generated by two modified Wigley models advancing at a constant forward speed in calm water or incident waves and the resultant radiation and diffraction forces are computed to validate this code.
Guanghua He, Masashi Kashiwagi
openaire   +1 more source