TY - JOUR

T1 - Hydrodynamic characteristics of Oscillating Water Column caisson breakwaters

AU - Kuo, Yu Shu

AU - Chung, Chih Yin

AU - Hsiao, Shih Chun

AU - Wang, Yu Kai

N1 - Funding Information:
This work was financially supported by the Research Grant MOST 105-2622-E-006-010 -CC2 from Ministry of Science and Technology, R.O.C.

PY - 2017/4/1

Y1 - 2017/4/1

N2 - This study uses the finite difference software, FLOW-3D, to develop a numerical model to simulate the hydrodynamic characteristics for Oscillating Water Column (OWC) caisson breakwaters. The numerical model is verified by a flume channel experiment for the interaction mechanism between air and water. Through the analyses with different incident wave parameters of the OWC caisson breakwaters, the following parameters are evaluated as energy capture efficiency indices: the amplitude magnification (a/a0), the air velocity at the orifice (Vori), the air oscillation pressure (Hp), the hydrodynamic efficiency (ηh), the energy produced by air for a period (Eair), and the average power produced by the air (Pair). The results show that the optimal dimensionless wavelength ratio (L/lc’) for the optimal hydrodynamic efficiency (ηh) is different from the optimal dimensionless wavelength ratio (L/lc’) for the average power produced by the air (Pair), the amplitude magnification (a/a0), the air velocity at the orifice (Vori), and the air oscillation pressure (Hp). For power generation purpose, this study suggests that the relationship curve between the dimensionless wavelength ratio (L/lc’) and the average power produced by air (Pair) can be used to determine the optimal range for wave energy capture and to design the optimal size for the OWC caisson breakwaters. Under the incident wave conditions of maximum average power produced by air, the lateral force and the base moment has enlargement phenomenon.

AB - This study uses the finite difference software, FLOW-3D, to develop a numerical model to simulate the hydrodynamic characteristics for Oscillating Water Column (OWC) caisson breakwaters. The numerical model is verified by a flume channel experiment for the interaction mechanism between air and water. Through the analyses with different incident wave parameters of the OWC caisson breakwaters, the following parameters are evaluated as energy capture efficiency indices: the amplitude magnification (a/a0), the air velocity at the orifice (Vori), the air oscillation pressure (Hp), the hydrodynamic efficiency (ηh), the energy produced by air for a period (Eair), and the average power produced by the air (Pair). The results show that the optimal dimensionless wavelength ratio (L/lc’) for the optimal hydrodynamic efficiency (ηh) is different from the optimal dimensionless wavelength ratio (L/lc’) for the average power produced by the air (Pair), the amplitude magnification (a/a0), the air velocity at the orifice (Vori), and the air oscillation pressure (Hp). For power generation purpose, this study suggests that the relationship curve between the dimensionless wavelength ratio (L/lc’) and the average power produced by air (Pair) can be used to determine the optimal range for wave energy capture and to design the optimal size for the OWC caisson breakwaters. Under the incident wave conditions of maximum average power produced by air, the lateral force and the base moment has enlargement phenomenon.

UR - http://www.scopus.com/inward/record.url?scp=85001930749&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85001930749&partnerID=8YFLogxK

U2 - 10.1016/j.renene.2016.11.028

DO - 10.1016/j.renene.2016.11.028

M3 - Article

AN - SCOPUS:85001930749

VL - 103

SP - 439

EP - 447

JO - Renewable Energy

JF - Renewable Energy

SN - 0960-1481

ER -