Abstract

The present work simulates the flow behavior in the system having oscillating water column (OWC) device for wave energy conversion using numerical modelling. To achieve this, the OWC device is structured inside the 2-dimensional numerical wave tank (NWT). Using the ANSYS Fluent software and the multiphase-based CFD technique, the issue is resolved. Unsteady, transient, and pressure-based solvers are included in this work. In this numerical model, the governing equations are based on Reynolds Averaged Navier-Stokes (RANS) equations with the Shear Stress Transport (SST) model, to capture the turbulence effect and the interface of 2-phases are implicitly captured by using volume of fluid (VOF) method. Using an open-channel wave generator, this study generates nonlinear “second-order Stokes waves”. In addition, the impact of nonlinearity on the “free surface description” at specific locations, the vertex average of total pressure near the air-duct, and the vertex average of y-velocity through the air-duct per unit width of the OWC device are investigated in detail. The outcomes indicate that the OWC device will consistently extract energy over an extended period of time.

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