Non-Linear Numerical Modeling and Experimental Testing of a Point Absorber Wave Energy Converter

摘要: Abstract A time domain model is applied to a three-dimensional point absorber wave energy converter. The dynamical properties of semi-submerged hemisphere oscillating around pivot where the vertical height this above mean water level are investigated. numerical includes calculation non-linear hydrostatic restoring moment by cubic polynomial function fit laboratory test results. Moreover, moments due viscous drag evaluated on considering horizontal and force components. influence motions effect investigated simplified formulation proportional quadratic velocity. Results from experiments shown in order validate calculations. All experimental results good agreement with linear potential theory as long waves sufficiently mild i.e. H / λ ≤ 0.02 . For steep waves, ≥ 0.04 however, relative velocities between body increase thus requiring inclusion effectively predict dynamics operation device passively damping power take-off found be negligible.