Theoretical Analysis of Performance of KAIMEI for Wave Power Absorber

Abstract

Wave power absorber KAIMEI, which is one of floating attenuators of oscillating water column, is analyzed theoretically by using equivalent floating body approximation. Computations are carried out for two type sections, one of which is catamaran and another is a revised one with bottom plate, assuming uniform sections, and neglecting hydrodynamic interaction between sections as strip theory. The results are compared with experimental data and summarized as follows: 1) The method presented in this paper predicts both characteristics of motions and power absorption, qualitatively and semi-quantitatively. 2) But we may have to take into account viscous damping to heaving motion of the revised KAIMEI with bottom plate. 3) Calculated power absorption per width is almost same with each other in case of two catamaran KAIMEIs adopted in this paper. 4) The bottom plate is effective both to reduce the motions and to enlarge the power absorption.