... ABSTRACT In this paper, a two-dimensional numerical method in time domain to estimate drift force acting on a floating OWC-type wave energy converter "Backward Bent Duct Buoy (BBDB)" moored loosely by elastic lines is proposed. Primary conversion efficiency of this device is also calculated...

... ABSTRACT: A floating-type wave energy converter, Backward Bent Duct Buoy (BBDB) was analyzed its hydrodynamic performance by numerical and experimental methods. A two-dimensional time-domain, fully nonlinear numerical wave tank (NWT) technique based on potential theory and the mixed Eulerian...

... ABSTRACT: In order to design a floating OWC-type wave energy converter such as Backward Bent Duct Buoy (BBDB), it is necessary to develop a numerical method to make clear an optimal hull shape which maximizes the generating electrical energy. In this paper, a two-dimensional numerical method...

... tank test bbdb model dimensional tank test bbdb backward bent duct buoy highest efficiency wave direction experimental apparatus primary conversion efficiency rao conversion efficiency renewable energy ocean energy primary conversion efficiency efficiency extension duct orifice...

... upstream oil & gas equation wave energy converter renewable energy turbine bbdb radiation force initial-boundary-value problem body surface free surface air chamber ocean energy system simulation external free surface backward bent duct buoy air pressure frequency domain...

... Two-dimensional wave tank tests in regular waves are carried out in order to clarify characteristics and a mechanism of generation of horizontal negative drift force acting on a floating OWC-type wave energy converter "Backward Bent Duct Buoy (BBDB)" in waves. Four kinds of experiments...

... ABSTRACT Backward Bent Duct Buoy (BBDB) which has a bent center-pipe opened to the lee side of the incident waves is a kind of moored floating OWC-type wave energy converter. In order to design this converter optimally, It is necessary to develop the numerical method in time domain on motions...

... Backward Bent Duct Buoy (BBDB) which has a bent center-pipe opened to the lee side of the incident waves is a kind of moored floating OWC-type wave energy converter. In this paper, in order to make clear the fundamental characteristics of BBDB, three-dimensional experiments in waves for motions...

... The motions of floating BBDB(backward-bent duct buoy) wave energy absorbers with an orifice type air-duct located at the middle of the top lid in regular waves are calculated taking account of the oscillating surface-pressure due to the pressure drop in the air chamber above the oscillating...

... ABSTRACT The mean power as well as the motions and time-mean horizontal drift force of a floating BBDB (backward-bent duct buoy) wave energy absorber in regular waves are calculated within the scope of the linear wave theory. The radiation-diffraction potential problem associated with the OWC...

... ABSTRACT Terminator type Backward Bent Duct Buoy (BBDB) was studied in water tank, very high conversion efficiency with low mooring force of BBDB was certified... Using tank test data, 6 floats terminator for Japan sea, and 4 floats terminator for Ireland were studied. Including turbine...

... ABSTRACT Backward Bent Duct Buoy (BBDB) was developed by corporation of Japan, India, China. It is characterized by bow air chamber duct, which is bent to backward below float, to open to the stern. BBDB has a high conversion efficiency and low mooring force and easy to construct, Power...

.... CylInder Float Backward Bent Duct Buoy (BBDB) is the design. When it is installed in Japanese Island Area such as Izu seven Islands or South West Islands or Islands in South China Sea including Taiwan. Power cost is estimated about 14 cent/KWh which is economical for Island Power supply. WAVE POWER...