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A numerical framework for turbulent tidal energy extraction over corrugated wavy surfaces.

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Title: A numerical framework for turbulent tidal energy extraction over corrugated wavy surfaces.
Authors: Duwairi, Hamzeh1 (AUTHOR), Alhyari, Ali M.1 (AUTHOR), Mustafa, Mohamad Y.2 (AUTHOR) mohamad.y.mustafa@uit.no, Alrbai, Mohammad1 (AUTHOR)
Source: Advances in Mechanical Engineering (Sage Publications Inc.). Mar2026, Vol. 18 Issue 3, p1-15. 15p.
Subjects: Tidal power, Turbulent flow, Hydrodynamics, Wave-current interaction, Computer simulation, Turbine efficiency, Renewable energy sources
Abstract: Tidal energy is a promising renewable resource capable of supporting global strategies to reduce carbon emissions. This study develops a numerical framework to predict tidal turbine performance under corrugated wavy surface hydrodynamics, capturing the combined influence of turbulent flow and wave–structure interaction. The model integrates the conservation of momentum and continuity equations with a corrugated wavy surface function to represent near-surface velocity fluctuations. The coupled equations were solved in MATLAB® to evaluate the effects of turbine radius, hub depth, wave amplitude, and wavelength under unsteady and incompressible turbulent flow conditions. The results show that increasing the turbine radius from 2 to 4 m raises the power ratio from approximately 0.46 to 0.97 due to the larger swept area. Increasing the hub depth from 5 to 8 m decreases the power ratio from 0.81 to 0.68 because of reduced near-bed velocities. Shorter wavelengths (λ = 0.55 m) and higher wave amplitudes (a = 0.65 m) significantly enhance power output, while longer wavelengths (λ = 0.65 m) produce negligible power (<0.1). The findings indicate that optimal performance occurs with maximum wave amplitude and minimal wavelength and hub depth. The developed model offers a practical theoretical tool for designing and optimizing tidal turbines under realistic marine wave conditions. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Tidal energy is a promising renewable resource capable of supporting global strategies to reduce carbon emissions. This study develops a numerical framework to predict tidal turbine performance under corrugated wavy surface hydrodynamics, capturing the combined influence of turbulent flow and wave–structure interaction. The model integrates the conservation of momentum and continuity equations with a corrugated wavy surface function to represent near-surface velocity fluctuations. The coupled equations were solved in MATLAB® to evaluate the effects of turbine radius, hub depth, wave amplitude, and wavelength under unsteady and incompressible turbulent flow conditions. The results show that increasing the turbine radius from 2 to 4 m raises the power ratio from approximately 0.46 to 0.97 due to the larger swept area. Increasing the hub depth from 5 to 8 m decreases the power ratio from 0.81 to 0.68 because of reduced near-bed velocities. Shorter wavelengths (λ = 0.55 m) and higher wave amplitudes (a = 0.65 m) significantly enhance power output, while longer wavelengths (λ = 0.65 m) produce negligible power (<0.1). The findings indicate that optimal performance occurs with maximum wave amplitude and minimal wavelength and hub depth. The developed model offers a practical theoretical tool for designing and optimizing tidal turbines under realistic marine wave conditions. [ABSTRACT FROM AUTHOR]
ISSN:16878132
DOI:10.1177/16878132261416646