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Effect of RANS-based turbulence models on nonlinear wave generation in a two-phase numerical wave tank

Elhanafi, A ORCID: 0000-0001-7866-9036, Fleming, A ORCID: 0000-0002-2738-4521, Leong, Z ORCID: 0000-0002-0644-1822 and MacFarlane, G ORCID: 0000-0002-0518-430X 2017 , 'Effect of RANS-based turbulence models on nonlinear wave generation in a two-phase numerical wave tank' , Progress in Computational Fluid Dynamics, vol. 17, no. 3 , pp. 141-158 , doi: 10.1504/PCFD.2016.10001174.

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Abstract

Ocean waves are the most important exciting source acting on marine structures such as ships, offshore platforms, wave energy converters and wavebreakers. In order to efficiently design the aforementioned structures, accurate modelling of these waves is of importance. In this paper a two dimensional Numerical Wave Tank (NWT) has been established based on the Reynoldsaveraged NavierStokes (RANS) equations for viscous, incompressible fluid and Volume of Fluid (VOF) method and a commercial software code ANSYS FLUENT (Release 15.0) has been used to numerically investigate ocean wave generation. Impact of different turbulence models such as standard k-ɛ, realizable k-ɛ, Shear Stress Transport (SST) and Reynolds Stress Models (RSM) on the generated ocean surface waves were investigated. With all uncertainties associated with various numerical setting aspects, experimental wave measurements over a wide range of wave conditions covering intermediate and deep water regimes have been conducted in a physical wave basin to validate the numerical results. The excessive generation of eddy viscosity resulted from using eddy viscosity turbulence models especially at the free surface interface, leads to a significant unphysical damping on the generated waves. Good numerical agreement with both experimental measurements and analytical wave theory was successfully achieved either with the RSM or implementing artificial turbulence damping at the airwater interface with the SST model.

Item Type: Article
Authors/Creators:Elhanafi, A and Fleming, A and Leong, Z and MacFarlane, G
Keywords: ANSYS FLUENT, numerical wave tank, NWT, wave generation, free surface turbulence damping, shear stress transport, SST, Reynolds stress models, RSM
Journal or Publication Title: Progress in Computational Fluid Dynamics
Publisher: Inderscience Publishers
ISSN: 1741-5233
DOI / ID Number: 10.1504/PCFD.2016.10001174
Copyright Information:

Copyright © 2017 Inderscience Enterprises Ltd.

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