Publications

Abbasnia, A., Ghiasi, M., Barandiaran, J. and Guedes Soares, C. (2015), “An implicit model of a submerged horizontal cylinder oscillating about an off-centered axis as a wave energy converter”, Renewable Energies Offshore, Guedes Soares, C. (Ed.), Taylor & Francis Group, London, UK, pp. pp. 247-255

A fully nonlinear two dimensional numerical wave tank is developed to model the wave interaction with a submerged cylinder rotating freely about an off-centered axis in the time domain frame. An artificial wave-maker and artificial sponge layer are adopted to keep the open sea condition. High order boundary elements method is implemented to solve flow field. Material node approach and Runge-Kutta time integration approach are combined to update the computational domain and boundary values.To find the kinematics of the submerged rotating cylinder, the Bernoulli equation is employed. Hence, the acceleration potential is chosen to calculate the time derivative of the velocity potential implicitly. The motion equation of fluid and the body are solved simultaneously. Convergence tests for different mesh sizes and time steps are conducted for the linear wave propagation problem. The solution is compared with analytical results. Wave interaction with the submerged cylinder is modeled and kinematics of the cylinder is computed. The time history of free surface evolution is shown on the upstream and downstream of the cylinder. The energy balance of the cylinder and the kinematics of the cylinder are also compared for the different submergence depth of the cylinder.

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