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A three-phase interpenetrating continua approach for wave and porous structure interaction

Liang Yang (Department of Energy and Power, Cranfield University, Bedford, UK)
Andrew Buchan (School of Engineering and Materials Science, Queen Mary University of London, London, UK)
Dimitrios Pavlidis (Department of Earth Science and Engineering, Imperial College London, London, UK)
Alan Jones (Department of Earth Science and Engineering, Imperial College London, London, UK)
Paul Smith (Department of Earth Science and Engineering, Imperial College London, London, UK)
Mikio Sakai (Resilience Engineering Research Centre, School of Engineering, The University of Tokyo, Tokyo, Japan)
Christopher Pain (Department of Earth Science and Engineering, Imperial College London, London, UK)

Engineering Computations

ISSN: 0264-4401

Article publication date: 14 May 2020

Issue publication date: 15 June 2021

185

Abstract

Purpose

This paper aims to propose a three-phase interpenetrating continua model for the numerical simulation of water waves and porous structure interaction.

Design/methodology/approach

In contrast with one-fluid formulation or multi-component methods, each phase has its own characteristics, density, velocity, etc., and each point is occupied by all phases. First, the porous structure is modelled as a phase of continua with a penalty force adding on the momentum equation, so the conservation of mass is guaranteed without source terms. Second, the adaptive unstructured mesh modelling with P1DG-P1 elements is used here to decrease the total number of degree of freedom maintaining the same order of accuracy.

Findings

Several benchmark problems are used to validate the model, which includes the Darcy flow, classical collapse of water column and water column with a porous structure. The interpenetrating continua model is a suitable approach for water wave and porous structure interaction problem.

Originality/value

The interpenetrating continua model is first applied for the water wave and porous structure interaction problem. First, the structure is modelled as phase of non-viscous fluid with penalty force, so the break of the porous structure, porosity changes can be easily embedded for further complex studies. Second, the mass conservation of fluids is automatically satisfied without special treatment. Finally, adaptive anisotropic mesh in space is employed to reduce the computational cost.

Keywords

Acknowledgements

L. Yang acknowledges support from the EPSRC Grant EP/P013198/1, GCRF from HEFCE/Research England. A. Buchan acknowledges the support from EPSRC Grant EP/M022684/1.

Citation

Yang, L., Buchan, A., Pavlidis, D., Jones, A., Smith, P., Sakai, M. and Pain, C. (2021), "A three-phase interpenetrating continua approach for wave and porous structure interaction", Engineering Computations, Vol. 38 No. 3, pp. 1157-1169. https://doi.org/10.1108/EC-08-2019-0386

Publisher

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Emerald Publishing Limited

Copyright © 2020, Emerald Publishing Limited

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