Towards modelling wave-induced forces on an armour layer unit of rubble mound coastal revetments

Cao, D., Yuan, J. and Chen, H. (2021) Towards modelling wave-induced forces on an armour layer unit of rubble mound coastal revetments. Ocean Engineering, 239, 109811. (doi: 10.1016/j.oceaneng.2021.109811)

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Abstract

Wave-induced forces on an armour layer unit are key parameters for assessing the stability of rubble mound coastal revetment, but how to predict them accurately and efficiently remains an open question. This study explores the feasibility of using the Morison-type equation to convert numerically simulated porous media flow in an armour layer into the forces on a single armour unit. Wave flume tests are conducted, in which the forces on a cuboid placed in the armour layer of a sloped revetment were measured. In conjunction, numerical simulations were performed using an OpenFOAM solver, which treats the revetment as a porous media. The validated flow simulation was synchronized with the force measurement to illustrate the correlations between the predicted porous media flow and the impact force. Based on these correlations, a Morison-type predictor, which consists of inertial force, drag force, pressure gradient force and lift force, is proposed. The calibrated model can reasonably approximate the temporal variation of wave-induced force. However, it is found that the inertial coefficients vary significantly with the dynamic stability number and the initial submergence of the armour unit. Additional research is required to give a sufficiently large dataset for calibrating empirical formulae.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Chen, Dr Hao
Authors: Cao, D., Yuan, J., and Chen, H.
College/School:College of Science and Engineering > School of Engineering
Journal Name:Ocean Engineering
Publisher:Elsevier
ISSN:0029-8018
ISSN (Online):1873-5258
Published Online:14 September 2021
Copyright Holders:Copyright © 2021 Elsevier Ltd
First Published:Reproduced in Ocean Engineering 239:109811
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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