TY - JOUR
TI - A second-order theory for an array of curved wave energy converters in open sea
AU - Michele, S
AU - Renzi, E
T2 - Journal of Fluids and Structures
AB - We present a second-order nonlinear theory for an array of curved flap-type wave energy converters (WECs) in open sea, excited by oblique incident waves. The flap model, when at rest, has a weak displacement of its wetted surface about the vertical plane. Using a perturbation-harmonic expansion technique, we decompose the set of nonlinear governing equations in a sequence of linearized boundary-value problems that can be investigated through analytical methods. The velocity potential at the leading order is solved in terms of elliptical coordinates and related Mathieu functions. Due to quadratic interactions of the first-order potential, a drift flow, a static angular displacement and a bound wave appear at the second order. At the same order the effect of the flap shape forces the first harmonic solution. We then compare an array of flat devices with an array of curved flaps, assuming several shape functions that could be of practical engineering interest. We show that hydrodynamic interactions between the curved flaps and incident waves can have constructive effects in terms of power absorption at large frequencies.
DA - 2019/07//
PY - 2019
PB - Elsevier
VL - 88
SP - 315
EP - 330
UR - https://www.sciencedirect.com/science/article/pii/S0889974618309022
DO - 10.1016/j.jfluidstructs.2019.05.007
LA - English
KW - Wave
KW - Oscillating Wave Surge Converter
KW - Modeling
KW - Array Effects
KW - Hydrodynamics
ER -