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Numerical investigation of green water for a two dimensional fixed rectangular structure

Numerical investigation of green water for a two dimensional fixed rectangular structure
Numerical investigation of green water for a two dimensional fixed rectangular structure
This paper presents results from a numerical study of wave overtopping leading to the occurrence of green water on a two-dimensional fixed rectangular structure, representative of a large ship. The problem is investigated using Computational Fluid Dynamics (CFD) with a Volume of Fluid (VOF) surface capturing scheme. Validation of the CFD model has been made with linear potential flow theory for small wave steepness and existing experimental measurements for larger wave steepness. The model has then been used to investigate overtopping events resulting from incident focused wave groups (representative of a NewWave type focused wave group) for a range of wave parameters. In agreement with Greco et al. [4] a range of overtopping events have been identified across this parameter space, including dam-break (DB) type, plunging plus dam-break (PDB) type, hammer-fist (HF) type and plunging wave (PW) type overtopping. The flow of green water on deck resulting from overtopping is divided into a transition zone and a “dam-break” zone (in which the water front velocity is almost constant). The water front velocity in the dambreak zone is investigated and summarized for the different types of overtopping events. Results show that the traditional design procedure may overestimate the green water loads, especially for PDB and DB events, by assuming the dam height to be freeboard exceedance in classic dam-break solution.
Australasian Fluid Mechanics Society
Zhang, Xiantao
7ce84454-77c4-442a-9c92-3649488611d9
Draper, Scott
efe46b7d-3989-403b-8b19-0b17dd54194f
Wolgamot, Hugh
d77b41b0-5869-4c59-87f7-dfd429d4fe8d
Zhao, Wenhua
26bfd8b2-ebe7-4f75-be51-e363bb83636c
Cheng, Liang
0ce99dcc-f682-4ec6-97aa-59fd87174385
White, David
a986033d-d26d-4419-a3f3-20dc54efce93
Zhang, Xiantao
7ce84454-77c4-442a-9c92-3649488611d9
Draper, Scott
efe46b7d-3989-403b-8b19-0b17dd54194f
Wolgamot, Hugh
d77b41b0-5869-4c59-87f7-dfd429d4fe8d
Zhao, Wenhua
26bfd8b2-ebe7-4f75-be51-e363bb83636c
Cheng, Liang
0ce99dcc-f682-4ec6-97aa-59fd87174385
White, David
a986033d-d26d-4419-a3f3-20dc54efce93

Zhang, Xiantao, Draper, Scott, Wolgamot, Hugh, Zhao, Wenhua, Cheng, Liang and White, David (2016) Numerical investigation of green water for a two dimensional fixed rectangular structure. In Proceedings of the 20th Australasian Fluid Mechanics Conference. Australasian Fluid Mechanics Society. 4 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

This paper presents results from a numerical study of wave overtopping leading to the occurrence of green water on a two-dimensional fixed rectangular structure, representative of a large ship. The problem is investigated using Computational Fluid Dynamics (CFD) with a Volume of Fluid (VOF) surface capturing scheme. Validation of the CFD model has been made with linear potential flow theory for small wave steepness and existing experimental measurements for larger wave steepness. The model has then been used to investigate overtopping events resulting from incident focused wave groups (representative of a NewWave type focused wave group) for a range of wave parameters. In agreement with Greco et al. [4] a range of overtopping events have been identified across this parameter space, including dam-break (DB) type, plunging plus dam-break (PDB) type, hammer-fist (HF) type and plunging wave (PW) type overtopping. The flow of green water on deck resulting from overtopping is divided into a transition zone and a “dam-break” zone (in which the water front velocity is almost constant). The water front velocity in the dambreak zone is investigated and summarized for the different types of overtopping events. Results show that the traditional design procedure may overestimate the green water loads, especially for PDB and DB events, by assuming the dam height to be freeboard exceedance in classic dam-break solution.

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Published date: 2016

Identifiers

Local EPrints ID: 424636
URI: http://eprints.soton.ac.uk/id/eprint/424636
PURE UUID: c1e02e27-888b-4a86-9a6f-f6f4a109653b
ORCID for David White: ORCID iD orcid.org/0000-0002-2968-582X

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Date deposited: 05 Oct 2018 11:39
Last modified: 19 Dec 2019 01:25

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Contributors

Author: Xiantao Zhang
Author: Scott Draper
Author: Hugh Wolgamot
Author: Wenhua Zhao
Author: Liang Cheng
Author: David White ORCID iD

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