TY - GEN
T1 - Computational study of drag reduction on a ship hull using the concept of air bubbles
AU - Mohammadpour, Javad
AU - Salehi, Fatemeh
AU - Garaniya, Vikram
AU - Baalisampang, Til
AU - Arzaghi, Ehsan
AU - Roberts, Ross
AU - Abbassi, Rouzbeh
N1 - Copyright the Author(s). Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.
PY - 2022/12
Y1 - 2022/12
N2 - Over 90% of world trade is carried by ocean marine vessels. However, ships consume nearly 60% of the supplied power to overcome the frictional resistance between the wetted hull and the water. Air lubrication is an efficient technique to reduce the effect of friction resistance that lowers fuel consumption and thus emissions. In this study, an effective technique is analysed to reduce friction resistance of a bluff body by air bubbles between the water and the wetted hull using a hydrofoil that induces Kelvin Helmholtz instability. In this regard, 3D simulations are carried out on a bluff body, including the gas-injected liquid lubrication system (GILLS) using the k-ꞷ shear stress transport (SST) turbulence model. The volume of fluid model is first validated with existing experimental data. A parametric study is then conducted to understand the influential factors on the performance of the GILLS unit. The results show that the drag coefficient decreases as the bluff body speed increases. The double inline GILLS units result in a 10.25% drag reduction. Therefore, the proposed technique offers higher fuel efficiency and could help to meet environmental regulations without any modifications to the engine systems
AB - Over 90% of world trade is carried by ocean marine vessels. However, ships consume nearly 60% of the supplied power to overcome the frictional resistance between the wetted hull and the water. Air lubrication is an efficient technique to reduce the effect of friction resistance that lowers fuel consumption and thus emissions. In this study, an effective technique is analysed to reduce friction resistance of a bluff body by air bubbles between the water and the wetted hull using a hydrofoil that induces Kelvin Helmholtz instability. In this regard, 3D simulations are carried out on a bluff body, including the gas-injected liquid lubrication system (GILLS) using the k-ꞷ shear stress transport (SST) turbulence model. The volume of fluid model is first validated with existing experimental data. A parametric study is then conducted to understand the influential factors on the performance of the GILLS unit. The results show that the drag coefficient decreases as the bluff body speed increases. The double inline GILLS units result in a 10.25% drag reduction. Therefore, the proposed technique offers higher fuel efficiency and could help to meet environmental regulations without any modifications to the engine systems
UR - https://www.afms.org.au/proceedings/23.html
M3 - Conference proceeding contribution
SP - 1
EP - 8
BT - Proceedings of the 23rd Australasian Fluid Mechanics Conference
A2 - Lei, C.
A2 - Thornber, B.
A2 - Armfield, S.
PB - Australasian Fluid Mechanics Society
CY - Perth, Western Australia
T2 - Australasian Fluid Mechanics Conference (23rd : 2022)
Y2 - 4 December 2022 through 8 December 2022
ER -