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Article

Comparison of Macro-Scale Porosity Implementations for CFD Modelling of Wave Interaction with Thin Porous Structures

1
Renewable Energy Group, CEMPS, Penryn Campus, University of Exeter, Penryn TR10 9FE, UK
2
Engineering Group, CEMPS, Streatham Campus, University of Exeter, Exeter EX4 4QF, UK
3
College of Shipbuilding Engineering, Harbin Engineering University, Harbin 150001, China
*
Author to whom correspondence should be addressed.
Academic Editor: Deborah Greaves
J. Mar. Sci. Eng. 2021, 9(2), 150; https://doi.org/10.3390/jmse9020150
Received: 28 December 2020 / Revised: 23 January 2021 / Accepted: 27 January 2021 / Published: 1 February 2021
(This article belongs to the Special Issue Selected Papers from the 7th PRIMaRE Conference 2020)
Computational fluid dynamics (CFD) modelling of wave interaction with thin perforated structures is of interest in a range of engineering applications. When large-scale effects such as forces and the overall flow behaviour are of interest, a microstructural resolution of the perforated geometry can be excessive or prohibitive in terms of computational cost. More efficiently, a thin porous structure can be represented by its macro-scale effects by means of a quadratic momentum source or pressure-drop respectively. In the context of regular wave interaction with thin porous structures and within an incompressible, two-phase Navier–Stokes and volume-of-fluid framework (based on interFoam of OpenFOAM®), this work investigates porosity representation as a porous surface with a pressure-jump condition and as volumetric isotropic and anisotropic porous media. Potential differences between these three types of macro-scale porosity implementations are assessed in terms of qualitative flow visualizations, velocity profiles along the water column, the wave elevation near the structures and the horizontal force on the structures. The comparison shows that all three types of implementation are capable of reproducing large-scale effects of the wave-structure interaction and that the differences between all obtained results are relatively small. It was found that the isotropic porous media implementation is numerically the most stable and requires the shortest computation times. The pressure-jump implementation requires the smallest time steps for stability and thus the longest computation times. This is likely due to the spurious local velocities at the air-water interface as a result of the volume-of-fluid interface capturing method combined with interFoam’s segregated pressure-velocity coupling algorithm. This paper provides useful insights and recommendations for effective macro-scale modelling of thin porous structures. View Full-Text
Keywords: CFD; OpenFOAM; VOF; interFoam; WSI; wave-structure interaction; perforated; porous; pressure-jump; porous media CFD; OpenFOAM; VOF; interFoam; WSI; wave-structure interaction; perforated; porous; pressure-jump; porous media
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MDPI and ACS Style

Feichtner, A.; Mackay, E.; Tabor, G.; Thies, P.R.; Johanning, L. Comparison of Macro-Scale Porosity Implementations for CFD Modelling of Wave Interaction with Thin Porous Structures. J. Mar. Sci. Eng. 2021, 9, 150. https://doi.org/10.3390/jmse9020150

AMA Style

Feichtner A, Mackay E, Tabor G, Thies PR, Johanning L. Comparison of Macro-Scale Porosity Implementations for CFD Modelling of Wave Interaction with Thin Porous Structures. Journal of Marine Science and Engineering. 2021; 9(2):150. https://doi.org/10.3390/jmse9020150

Chicago/Turabian Style

Feichtner, Anna, Ed Mackay, Gavin Tabor, Philipp R. Thies, and Lars Johanning. 2021. "Comparison of Macro-Scale Porosity Implementations for CFD Modelling of Wave Interaction with Thin Porous Structures" Journal of Marine Science and Engineering 9, no. 2: 150. https://doi.org/10.3390/jmse9020150

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