TY - JOUR
T1 - Wave energy absorption by a floating air bag
AU - Kurniawan, A.
AU - Chaplin, J. R.
AU - Greaves, D. M.
AU - Hann, M.
PY - 2017/2/10
Y1 - 2017/2/10
N2 - A floating air bag, ballasted in water, expands and contracts as it heaves under wave action. Connecting the bag to a secondary volume via a turbine transforms the bag into a device capable of generating useful energy from the waves. Small-scale measurements of the device reveal some interesting properties, which are successfully predicted numerically. Owing to its compressibility, the device can have a heave resonance period longer than that of a rigid device of the same shape and size, without any phase control. Furthermore, varying the amount of air in the bag is found to change its shape and hence its dynamic response, while varying the turbine damping or the air volume ratio changes the dynamic response without changing the shape.
AB - A floating air bag, ballasted in water, expands and contracts as it heaves under wave action. Connecting the bag to a secondary volume via a turbine transforms the bag into a device capable of generating useful energy from the waves. Small-scale measurements of the device reveal some interesting properties, which are successfully predicted numerically. Owing to its compressibility, the device can have a heave resonance period longer than that of a rigid device of the same shape and size, without any phase control. Furthermore, varying the amount of air in the bag is found to change its shape and hence its dynamic response, while varying the turbine damping or the air volume ratio changes the dynamic response without changing the shape.
KW - wave-structure interactions
KW - waves/free-surface flows
UR - http://www.scopus.com/inward/record.url?scp=85007495946&partnerID=8YFLogxK
U2 - 10.1017/jfm.2016.811
DO - 10.1017/jfm.2016.811
M3 - Article
AN - SCOPUS:85007495946
SN - 0022-1120
VL - 812
SP - 294
EP - 320
JO - Journal of Fluid Mechanics
JF - Journal of Fluid Mechanics
ER -