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Article: A numerical wave tank with large eddy simulation for wave breaking

TitleA numerical wave tank with large eddy simulation for wave breaking
Authors
KeywordsOpenFOAM
Reflection coefficient
Turbulence modeling
Wave breaking
Wave simulation
Issue Date1-Dec-2022
PublisherElsevier
Citation
Ocean Engineering, 2022, v. 266 How to Cite?
AbstractA three-dimensional (3D) numerical wave tank (NWT) is developed based on OpenFOAM. The propagation and breaking of waves with a moderate wavelength that could be generated in the laboratory are studied. The wave periods range from 0.5 to 1.79 s and wave steepness goes up to 0.05. The volume of fluid method (VOF) is employed for interface capturing. The relaxation zone method is implemented for wave generation and ab-sorption at the boundaries. Computationally significant factors like grid size, relaxation weight and time step are investigated to find the optimal parameters of the numerical models for various wave regimes. A relationship between grid size and time step, similar to the wave dispersion relation, is found. The accuracy and performance of the NWT are assessed through the reflecting coefficient, wave damping and phase distortion rates. Simulation conditions are monitored to achieve an error rate of less than 3%. To mitigate the effects of numerical errors on the calculation of the reflection coefficient, a modified version of Goda's approach is proposed. The coefficient of wave reflection at the outlet boundary calculated by the conventional Goda's method is as high as 4.3%. This value can be modified to be less than 2% after utilizing the revised Goda's method. Turbulent flows, especially for the breaking wave regime, are investigated by large eddy simulation. A one-equation sub-grid eddy viscosity model, with coefficients being derived from local flow properties, is employed for turbulence closure. A case study of wave breaking on a fixed bar is simulated. The validation of this NWT model is confirmed by comparing the numerical results with experimental data.
Persistent Identifierhttp://hdl.handle.net/10722/328502
ISSN
2023 Impact Factor: 4.6
2023 SCImago Journal Rankings: 1.214
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorPeng, NN-
dc.contributor.authorChow, KW-
dc.date.accessioned2023-06-28T04:45:32Z-
dc.date.available2023-06-28T04:45:32Z-
dc.date.issued2022-12-01-
dc.identifier.citationOcean Engineering, 2022, v. 266-
dc.identifier.issn0029-8018-
dc.identifier.urihttp://hdl.handle.net/10722/328502-
dc.description.abstractA three-dimensional (3D) numerical wave tank (NWT) is developed based on OpenFOAM. The propagation and breaking of waves with a moderate wavelength that could be generated in the laboratory are studied. The wave periods range from 0.5 to 1.79 s and wave steepness goes up to 0.05. The volume of fluid method (VOF) is employed for interface capturing. The relaxation zone method is implemented for wave generation and ab-sorption at the boundaries. Computationally significant factors like grid size, relaxation weight and time step are investigated to find the optimal parameters of the numerical models for various wave regimes. A relationship between grid size and time step, similar to the wave dispersion relation, is found. The accuracy and performance of the NWT are assessed through the reflecting coefficient, wave damping and phase distortion rates. Simulation conditions are monitored to achieve an error rate of less than 3%. To mitigate the effects of numerical errors on the calculation of the reflection coefficient, a modified version of Goda's approach is proposed. The coefficient of wave reflection at the outlet boundary calculated by the conventional Goda's method is as high as 4.3%. This value can be modified to be less than 2% after utilizing the revised Goda's method. Turbulent flows, especially for the breaking wave regime, are investigated by large eddy simulation. A one-equation sub-grid eddy viscosity model, with coefficients being derived from local flow properties, is employed for turbulence closure. A case study of wave breaking on a fixed bar is simulated. The validation of this NWT model is confirmed by comparing the numerical results with experimental data.-
dc.languageeng-
dc.publisherElsevier-
dc.relation.ispartofOcean Engineering-
dc.subjectOpenFOAM-
dc.subjectReflection coefficient-
dc.subjectTurbulence modeling-
dc.subjectWave breaking-
dc.subjectWave simulation-
dc.titleA numerical wave tank with large eddy simulation for wave breaking-
dc.typeArticle-
dc.identifier.doi10.1016/j.oceaneng.2022.112555-
dc.identifier.scopuseid_2-s2.0-85139724931-
dc.identifier.volume266-
dc.identifier.eissn1873-5258-
dc.identifier.isiWOS:000895135700003-
dc.publisher.placeOXFORD-
dc.identifier.issnl0029-8018-

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