Numerical evaluation of the power output of an oscillating water column wave energy converter installed in the southern Brazilian coast

• Published in: Energy (Oxford) 2018-11, Vol.162, p.1115-1124
• Main Authors: Lisboa, Rodrigo C., Teixeira, Paulo R.F., Torres, Fernando R., Didier, Eric
• Format: Article
• Language: English
• Subjects: Coastal zone; Computational fluid dynamics; Converters; Energy; Energy conversion efficiency; Evaluation; Mathematical models; Numerical analysis; Numerical simulation; Optimization; Oscillating water column; Oscillators; Power efficiency; Productivity; RANS-VoF model; Relief valves; Reynolds averaged Navier-Stokes method; Turbines; Water column; Wave energy; Wave power; Wells turbines
• ISSN: 0360-5442; 1873-6785
• DOI: 10.1016/j.energy.2018.08.079

Although studies show high wave energy potential in several coastal regions around the world, its evaluation and detailed characterization are necessary to optimize its harvest. This study aims at numerically evaluating the power output of an Oscillating Water Column (OWC) wave energy converter installed in the southern Brazilian coast. The FLUENT® numerical model, based on the Reynolds Averaged Navier-Stokes (RANS) equations and the Volume of Fluid (VoF) technique, is used. The turbine diameter optimization (TDO) model, which considers the motion of the water surface inside the OWC chamber as a piston movement in response to the hydrodynamic forces from the incoming waves, is also employed. The OWC is equipped with a Wells turbine, with pressure control (relief valve) and regulation of the turbine rotational speed. The turbine diameter is chosen by taking into account the wave characteristics in the region where the device is installed. An OWC device 10 m wide, 10 m long, 16 m high (10 m submerged) with a front wall 2.5 m submerged reaches its optimum performance with an annual-averaged power output of 36.48 kW (efficiency of 54.6%), by using a turbine with 2.25 m diameter. •Power output of an onshore OWC wave energy converter is evaluated in southern Brazil.•An onshore OWC device is analyzed by both 2D Navier-Stokes and TDO models.•A 3D aerodynamic model takes into account the use of a Wells turbine.•Optimal turbine size is chosen for the sea state distribution with low computational cost.•Optimum annual-averaged power output is 36.48 kW with a turbine diameter of 2.25 m.