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A novel approach to wave energy conversion using CFD technique

Abbas Nawar, Barbahan Michel, Kabrial Yako, Kabrial Admoun

Polish Maritime Research

2024

nr 3

113--125

This article details the development and evaluation of a novel wave energy converter (WEC) aimed at efficiently capturing wave energy for electricity production. The study employs Computational Fluid Dynamics (CFD) techniques, specifically the URANS method and the k-ω SST turbulence model, to solve the Navier-Stokes equations and capture the free Surface using the Volume of Fluid (VOF) model. The CFD results are validated against experimental data to ensure accuracy. Various design parameters of the proposed device were tested, revealing that the arms and bottom angle significantly affect its performance. Unlike the floating Wave Dragon (WD) device, which utilises potential energy and is set in deep water, the new fixed-seabed device is positioned in the transitional wave region near the shore, where waves retain 80% of their energy. It can be constructed from environmentally friendly cement, making it resistant to hurricanes and suitable for any wave turbine in the open sea. The MP687 turbine was used to capture the wave energy in the proposed device, testing its performance in three positions: in the open sea, in the middle of the device, and at the device’s outlet. The results show that the device significantly enhances wave energy concentration, especially when the turbine is placed at the outlet. The proposed device offers numerous advantages, including its fixed position in a high-energy wave zone, the efficient use of turbulent kinetic energy, and robust construction that can withstand storms.

Assessing Tidal Current Velocity Across Different Water Depth Layers in Khenifiss Lagoon (Southern Atlantic Coast of Morocco) – Implications for Potential Tidal Energy Extraction

El Behja Hamza, El M’rini Abdelmounim, El-Wamdeni Zouhayr, Bouchkara Mohammed, Nachite Driss, El Khalidi Khalid, El-Hassani Hichame, Zourarah Bendahhou

Ecological Engineering & Environmental Technology

2024

Vol. 25, iss. 12

278--289

The global industrial economy is heavily reliant on fossil fuels, but their depletion and environmental impact require a rapid shift to low-carbon energy sources. Coastal lagoons offer a potential sustainable energy source through the extraction of energy from tidal currents at different water depths. Therefore, the measurement of currents in each depth layer is crucial for determining suitable locations and studying the feasibility of harnessing this renewable energy through tidal power generation technologies. This study focuses on evaluating the potential of tidal currents for generating marine renewable energy in the Khenifiss Lagoon, a protected area in southern Morocco, for local use, with the goal of supporting the sustainability of this ecosystem. The lagoon’s hydrodynamics are primarily dominated by tides, with the semi-diurnal component (M2) dominating the tidal cycle (period of 12 h 25) with 1.5 to 3.2 m of tidal range. The Multicell Argonaut-XR ADCP is employed to measure current velocities over two days at two specific stations within the lagoon without the intention of establishing a comparative analysis between them. Station 1 has 1 m intervals across an 8 m depth, and Station 2 has 0.5 m intervals across a 5 m depth. The results reveal that at Station 1, layers 2, 3, 4, and 5 (-2 to -5 m depth) exhibited consistent current velocity conditions, making them well-suited for power density conversion. The average power density range in these layers ranged from 54.926 W/m2 to 65.223 W/m2. Similarly, at Station 2, layers 2, 3, 4, 5, and 6 (-2.5 to -4.5 m depth) displayed favorable current velocity conditions for power density conversion, with an average power density range of 23.911 W/m2 to 36.630 W/m2 . This work establishes a foundation for more detailed tidal current resource assessments for future tidal energy development in the Khenifiss lagoon and such a semi-enclosed natural system.