Open AccessScattering of surface waves by a vertical truncated structured cylinder
Author(s) -
Robert Porter,
Siming Zheng,
Hui Liang
Publication year - 2022
Publication title -
proceedings - royal society. mathematical, physical and engineering sciences
Language(s) - English
Resource type - Journals
eISSN - 1471-2946
pISSN - 1364-5021
DOI - 10.1098/rspa.2021.0824
Subject(s) - cylinder , scattering , bathymetry , geometry , waves and shallow water , mechanics , refraction , free surface , computation , potential flow , plane (geometry) , vertical plane , boundary value problem , flow (mathematics) , optics , physics , mathematical analysis , mathematics , geology , engineering , structural engineering , oceanography , algorithm , thermodynamics
This paper describes the solution to the problem of scattering of plane incident waves on water of constant depth by a bottom mounted circular cylinder, extending partially through the depth, which has an internal structure comprised of closely spaced thin vertical barriers between which fluid is allowed to flow. The problem is solved under full depth-dependent linearized water wave theory using an effective medium equation to describe the fluid motion in cylinder and effective boundary conditions to match that flow to the fluid region outside the cylinder. The interest in this problem lies in the development of novel solution methods for fully three-dimensional water wave interaction with bathymetric plate arrays. Results computed using this theory are compared with a shallow water approximation based on the recent work of Marangos & Porter (2021 Shallow water theory for structured bathymetry.Proc. R. Soc. A 477 , 20210421.) and with accurate computations of an exact representation of the geometry using a discrete set of plates. Other results highlight the resonant directional lensing effects of this type of cylindrical plate array device.