Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 12, 2016 - November 13, 2016
An OWC type wave power generation is consisted of an air-chamber with an oscillating water column (OWC) and a turbine-generator. Two numerical methods are described for analyzing the characteristics of the air-chamber installed on a breakwater. One is the eigenfunction expansion method under the condition that the linear water wave theory is applicable. The method is useful, because the solutions give good agreement with the experimental results in the practical range and are able to calculate in short time. However the method cannot predict the loss and the theoretical maximum efficiency of OWC becomes 100%. The other method uses the computational fluid dynamics of Navier-Stokes equation in order to create the mechanism of the loss. It is predicted by the CFD that the source of the loss is the very large vortex generated in front of the air-chamber.
