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Wave impacts on structures with rectangular geometries: Part 2 decks, baffles and seawalls with impermeable or porous surfaces

This paper considers wave impacts on baffles, on baffles or decks adjacent to a vertical wall, and on porous seawalls and/or sea beds. For seawalls and vertical baffles, impacts can occur in steep waves, whilst a deck can be struck from below by a rising wave crest either in open sea or in a tank wi...

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Main Authors: Nor Aida Zuraimi, Md Noar, Elliott-Sands, Matthew, Greenhow, Martin
Format: Article
Language:English
Published: Elsevier 2019
Subjects:
QA Mathematics
Online Access:http://umpir.ump.edu.my/id/eprint/30522/7/The%20Usage%20of%20Treated%20Plastic%20as%20Additive1.pdf
http://umpir.ump.edu.my/id/eprint/30522/
https://doi.org/10.1016/j.apor.2019.06.007
https://doi.org/10.1016/j.apor.2019.06.007
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spelling my.ump.umpir.305222021-02-08T03:27:20Z http://umpir.ump.edu.my/id/eprint/30522/ Wave impacts on structures with rectangular geometries: Part 2 decks, baffles and seawalls with impermeable or porous surfaces Nor Aida Zuraimi, Md Noar Elliott-Sands, Matthew Greenhow, Martin QA Mathematics This paper considers wave impacts on baffles, on baffles or decks adjacent to a vertical wall, and on porous seawalls and/or sea beds. For seawalls and vertical baffles, impacts can occur in steep waves, whilst a deck can be struck from below by a rising wave crest either in open sea or in a tank with standing waves (sloshing). A simple analytical model for the pressure impulse, P, due to a wave of idealized geometry and dynamics is developed and applied to the following geometries with impermeable surfaces: • horizontal wave impact onto a vertical wall with a deck at the waterline, • vertical wave impact under a deck in the same configuration (equivalent to vertical water impact of a horizontal plate), • horizontal wave impact onto a surface-piercing vertical baffle in open sea, • as for 3. but with the baffle in front of a wall, • as for 4. but with a deck extending from the vertical wall to the baffle, • bottom-mounted baffle in front of a wall with impact occurring on the wall. We also consider cases that complement part 1 of this paper to include the effect on impacts on a seawall with a porous sea bed and/or sea wall with/without a berm. Finally we reconsider case 3) above but with a porous baffle. The method uses eigenfunction expansions in each of the rectangular regions that satisfy some of the impermeable or porous surface conditions, and a simplified free-surface condition. Their unknown coefficients are determined from the impact boundary condition, impermeable or porous boundary conditions and by matching the solutions, in any two neighbouring rectangles, along their common boundary. Although the fluid motion is treated rather crudely, the method yields the pressure impulse throughout the entire region. Impulses, I, and moment impulses, M, on all or parts of the structure are also presented. Elsevier 2019 Article PeerReviewed pdf en http://umpir.ump.edu.my/id/eprint/30522/7/The%20Usage%20of%20Treated%20Plastic%20as%20Additive1.pdf Nor Aida Zuraimi, Md Noar and Elliott-Sands, Matthew and Greenhow, Martin (2019) Wave impacts on structures with rectangular geometries: Part 2 decks, baffles and seawalls with impermeable or porous surfaces. Applied Ocean Research, 90 (101850). pp. 1-18. ISSN 0141-1187 https://doi.org/10.1016/j.apor.2019.06.007 https://doi.org/10.1016/j.apor.2019.06.007
institution Universiti Malaysia Pahang
building UMP Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Pahang
content_source UMP Institutional Repository
url_provider http://umpir.ump.edu.my/
language English
topic QA Mathematics
spellingShingle QA Mathematics
Nor Aida Zuraimi, Md Noar
Elliott-Sands, Matthew
Greenhow, Martin
Wave impacts on structures with rectangular geometries: Part 2 decks, baffles and seawalls with impermeable or porous surfaces
description This paper considers wave impacts on baffles, on baffles or decks adjacent to a vertical wall, and on porous seawalls and/or sea beds. For seawalls and vertical baffles, impacts can occur in steep waves, whilst a deck can be struck from below by a rising wave crest either in open sea or in a tank with standing waves (sloshing). A simple analytical model for the pressure impulse, P, due to a wave of idealized geometry and dynamics is developed and applied to the following geometries with impermeable surfaces: • horizontal wave impact onto a vertical wall with a deck at the waterline, • vertical wave impact under a deck in the same configuration (equivalent to vertical water impact of a horizontal plate), • horizontal wave impact onto a surface-piercing vertical baffle in open sea, • as for 3. but with the baffle in front of a wall, • as for 4. but with a deck extending from the vertical wall to the baffle, • bottom-mounted baffle in front of a wall with impact occurring on the wall. We also consider cases that complement part 1 of this paper to include the effect on impacts on a seawall with a porous sea bed and/or sea wall with/without a berm. Finally we reconsider case 3) above but with a porous baffle. The method uses eigenfunction expansions in each of the rectangular regions that satisfy some of the impermeable or porous surface conditions, and a simplified free-surface condition. Their unknown coefficients are determined from the impact boundary condition, impermeable or porous boundary conditions and by matching the solutions, in any two neighbouring rectangles, along their common boundary. Although the fluid motion is treated rather crudely, the method yields the pressure impulse throughout the entire region. Impulses, I, and moment impulses, M, on all or parts of the structure are also presented.
format Article
author Nor Aida Zuraimi, Md Noar
Elliott-Sands, Matthew
Greenhow, Martin
author_facet Nor Aida Zuraimi, Md Noar
Elliott-Sands, Matthew
Greenhow, Martin
author_sort Nor Aida Zuraimi, Md Noar
title Wave impacts on structures with rectangular geometries: Part 2 decks, baffles and seawalls with impermeable or porous surfaces
title_short Wave impacts on structures with rectangular geometries: Part 2 decks, baffles and seawalls with impermeable or porous surfaces
title_full Wave impacts on structures with rectangular geometries: Part 2 decks, baffles and seawalls with impermeable or porous surfaces
title_fullStr Wave impacts on structures with rectangular geometries: Part 2 decks, baffles and seawalls with impermeable or porous surfaces
title_full_unstemmed Wave impacts on structures with rectangular geometries: Part 2 decks, baffles and seawalls with impermeable or porous surfaces
title_sort wave impacts on structures with rectangular geometries: part 2 decks, baffles and seawalls with impermeable or porous surfaces
publisher Elsevier
publishDate 2019
url http://umpir.ump.edu.my/id/eprint/30522/7/The%20Usage%20of%20Treated%20Plastic%20as%20Additive1.pdf
http://umpir.ump.edu.my/id/eprint/30522/
https://doi.org/10.1016/j.apor.2019.06.007
https://doi.org/10.1016/j.apor.2019.06.007
_version_ 1691733263075246080
score 13.211869

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