Wave diffraction by multiple arbitrary shaped cracks in an infinitely extended ice sheet of finite water depth
Wave diffraction by multiple arbitrary shaped cracks in an infinitely extended ice sheet of finite water depth
Flexural-gravity wave interactions with multiple cracks in an ice sheet of infinite extent are considered, based on the linearized velocity potential theory for fluid flow and thin elastic plate model for an ice sheet. Both the shape and location of the cracks can be arbitrary, while an individual crack can be either open or closed. Free edge conditions are imposed at the crack. For open cracks, zero corner force conditions are further applied at the crack tips. The solution procedure starts from series expansion in the vertical direction based on separation of variables, which decomposes the three-dimensional problem into an infinite number of coupled two-dimensional problems in the horizontal plane. For each two-dimensional problem, an integral equation is derived along the cracks, with the jumps of displacement and slope of the ice sheet as unknowns in the integrand. By extending the crack in the vertical direction into the fluid domain, an artificial vertical surface is formed, on which an orthogonal inner product is adopted for the vertical modes. Through this, the edge conditions at the cracks are satisfied, together with continuous conditions of pressure and velocity on the vertical surface. The integral differential equations are solved numerically through the boundary element method together with the finite difference scheme for the derivatives along the crack. Extensive results are provided and analysed for cracks with various shapes and locations, including the jumps of displacement and slope, diffraction wave coefficient, and the scattered cross-section.
Li, Zhi Fu
5d74ebbb-c3f1-4aa4-b834-b66d528c58d4
Wu, Guo Xiong
590c30ec-6444-42df-9b2a-32f203146a71
Ren, Kang
d579a21f-df53-4646-b697-5314e79d82e0
25 June 2020
Li, Zhi Fu
5d74ebbb-c3f1-4aa4-b834-b66d528c58d4
Wu, Guo Xiong
590c30ec-6444-42df-9b2a-32f203146a71
Ren, Kang
d579a21f-df53-4646-b697-5314e79d82e0
Li, Zhi Fu, Wu, Guo Xiong and Ren, Kang
(2020)
Wave diffraction by multiple arbitrary shaped cracks in an infinitely extended ice sheet of finite water depth.
Journal of Fluid Mechanics, 893, [A14].
(doi:10.1017/jfm.2020.238).
Abstract
Flexural-gravity wave interactions with multiple cracks in an ice sheet of infinite extent are considered, based on the linearized velocity potential theory for fluid flow and thin elastic plate model for an ice sheet. Both the shape and location of the cracks can be arbitrary, while an individual crack can be either open or closed. Free edge conditions are imposed at the crack. For open cracks, zero corner force conditions are further applied at the crack tips. The solution procedure starts from series expansion in the vertical direction based on separation of variables, which decomposes the three-dimensional problem into an infinite number of coupled two-dimensional problems in the horizontal plane. For each two-dimensional problem, an integral equation is derived along the cracks, with the jumps of displacement and slope of the ice sheet as unknowns in the integrand. By extending the crack in the vertical direction into the fluid domain, an artificial vertical surface is formed, on which an orthogonal inner product is adopted for the vertical modes. Through this, the edge conditions at the cracks are satisfied, together with continuous conditions of pressure and velocity on the vertical surface. The integral differential equations are solved numerically through the boundary element method together with the finite difference scheme for the derivatives along the crack. Extensive results are provided and analysed for cracks with various shapes and locations, including the jumps of displacement and slope, diffraction wave coefficient, and the scattered cross-section.
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Accepted/In Press date: 18 March 2020
Published date: 25 June 2020
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Local EPrints ID: 493585
URI: http://eprints.soton.ac.uk/id/eprint/493585
ISSN: 0022-1120
PURE UUID: 12b143ad-d6e8-4b26-b974-a538e947efaf
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Date deposited: 09 Sep 2024 16:30
Last modified: 10 Sep 2024 02:10
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Author:
Zhi Fu Li
Author:
Guo Xiong Wu
Author:
Kang Ren
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