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Analysis of fluid flow impact oscillatory pressures with air entrapment at structures

Analysis of fluid flow impact oscillatory pressures with air entrapment at structures
Analysis of fluid flow impact oscillatory pressures with air entrapment at structures
Hydrodynamic wave loading at coastal structures is a complex phenomenon to quantify. The chaotic nature of the fluid flow field as waves break against such structures has presented many challenges to Scientists and Engineers for the design of coastal defences. The provision of installations such as breakwaters to resist wave loading and protect coastal areas has evolved predominantly through empirical and experimental observations. This is due to the challenging understanding and quantification of wave impact energy transfer processes with air entrainment at these structures. This paper presents a numerical investigation on wave loading at porous formations including the effects of air entrapment. Porous morphologies generated from cubic packed spheres with varying characteristics representing a breakwater structure are incorporated into the numerical model at the impact interface and the effect on the pressure field is investigated as the wave breaks. We focus on analysing the impulse impact pressure as a surging flow front impacts a porous wall. Thereafter we investigate the multi-modal oscillatory wave impact pressure signals which result from a transient plunging breaker wave impinging upon a modelled porous coastal protective structure. The high frequency oscillatory pressure effects resulting from air entrapment are clearly observed in the simulations. A frequency domain analysis of the impact pressure responses is undertaken. We show that the structural morphology of the porous assembly influences the pressure response signal recorded during the impact event. The findings provide good confidence on the robustness of our numerical model particularly for investigating the air bubbles formation and their mechanics at impact with porous walls
Porous structures, OpenFOAM, compressible flow, fluid structure interaction
Coastal Engineering Research Council
Mayon, Robert, Brian
064adea3-0fab-4cbe-a995-a14b0460f75d
Sabeur, Zoheir
74b55ff0-94cc-4624-84d5-bb816a7c9be6
Tan, Mingyi
4d02e6ad-7915-491c-99cc-a1c85348267c
Djidjeli, Kamal
94ac4002-4170-495b-a443-74fde3b92998
Lynett, Patrick
Mayon, Robert, Brian
064adea3-0fab-4cbe-a995-a14b0460f75d
Sabeur, Zoheir
74b55ff0-94cc-4624-84d5-bb816a7c9be6
Tan, Mingyi
4d02e6ad-7915-491c-99cc-a1c85348267c
Djidjeli, Kamal
94ac4002-4170-495b-a443-74fde3b92998
Lynett, Patrick

Mayon, Robert, Brian, Sabeur, Zoheir, Tan, Mingyi and Djidjeli, Kamal (2017) Analysis of fluid flow impact oscillatory pressures with air entrapment at structures. In, Lynett, Patrick (ed.) Proceedings of 35th Conference on Coastal Engineering, Antalya, Turkey, 2016. 35th Conference on Coastal Engineering (17/07/16 - 22/07/16) Coastal Engineering Research Council. (doi:10.9753/icce.v35.structures.31).

Record type: Book Section

Abstract

Hydrodynamic wave loading at coastal structures is a complex phenomenon to quantify. The chaotic nature of the fluid flow field as waves break against such structures has presented many challenges to Scientists and Engineers for the design of coastal defences. The provision of installations such as breakwaters to resist wave loading and protect coastal areas has evolved predominantly through empirical and experimental observations. This is due to the challenging understanding and quantification of wave impact energy transfer processes with air entrainment at these structures. This paper presents a numerical investigation on wave loading at porous formations including the effects of air entrapment. Porous morphologies generated from cubic packed spheres with varying characteristics representing a breakwater structure are incorporated into the numerical model at the impact interface and the effect on the pressure field is investigated as the wave breaks. We focus on analysing the impulse impact pressure as a surging flow front impacts a porous wall. Thereafter we investigate the multi-modal oscillatory wave impact pressure signals which result from a transient plunging breaker wave impinging upon a modelled porous coastal protective structure. The high frequency oscillatory pressure effects resulting from air entrapment are clearly observed in the simulations. A frequency domain analysis of the impact pressure responses is undertaken. We show that the structural morphology of the porous assembly influences the pressure response signal recorded during the impact event. The findings provide good confidence on the robustness of our numerical model particularly for investigating the air bubbles formation and their mechanics at impact with porous walls

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More information

Accepted/In Press date: 29 April 2017
e-pub ahead of print date: 23 June 2017
Venue - Dates: 35th Conference on Coastal Engineering, Turkey, 2016-07-17 - 2016-07-22
Keywords: Porous structures, OpenFOAM, compressible flow, fluid structure interaction
Organisations: Computational Engineering & Design Group, Fluid Structure Interactions Group, IT Innovation, Southampton Marine & Maritime Institute, Education Hub

Identifiers

Local EPrints ID: 410900
URI: http://eprints.soton.ac.uk/id/eprint/410900
PURE UUID: a9106fe7-9320-4f76-a2de-f215589929c7
ORCID for Robert, Brian Mayon: ORCID iD orcid.org/0000-0001-8758-048X
ORCID for Zoheir Sabeur: ORCID iD orcid.org/0000-0003-4325-4871

Catalogue record

Date deposited: 09 Jun 2017 16:31
Last modified: 07 Oct 2020 07:51

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Contributors

Author: Robert, Brian Mayon ORCID iD
Author: Zoheir Sabeur ORCID iD
Author: Mingyi Tan
Author: Kamal Djidjeli
Editor: Patrick Lynett

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