Numerical Study on the Extrapolation Method for Predicting the Full-scale Resistance of a Ship with an Air Lubrication System
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초록
Frictional resistance comprises more than 60% of the total resistance for most merchant ships. Active and passive devices have been used to reduce frictional resistance, but the most effective and practical device is an air lubrication system. Such systems have been applied in several ships, and their effects have been verified in sea trials. On the other hand, there are some differences between the results predicted in model tests and those measured in sea trials. In this study, numerical analyses were carried out for a model and a full-scale ship. A new extrapolation method was proposed to improve the estimation of the full-scale resistance of a ship with an air lubrication system. The volume of fluid (VOF) method was considered for the numerical models of the air layer. The numerical method was validated by comparing the experimental data on the air layer pattern and the total resistance.
Abstract
Frictional resistance comprises more than 60% of the total resistance for most merchant ships. Active and passive devices have been used to reduce frictional resistance, but the most effective and practical device is an air lubrication system. Such systems have been applied in several ships, and their effects have been verified in sea trials. On the other hand, there are some differences between the results predicted in model tests and those measured in sea trials. In this study, numerical analyses were carried out for a model and a full-scale ship. A new extrapolation method was proposed to improve the estimation of the full-scale resistance of a ship with an air lubrication system. The volume of fluid (VOF) method was considered for the numerical models of the air layer. The numerical method was validated by comparing the experimental data on the air layer pattern and the total resistance.
참고문헌 (8)
- Bushnell, D. M., "Viscous Drag Reduction in Boundary Layers", Proceedings of The American Institute of Aeronautics and Astronautics, Inc. (1990)
- Ceccio, S. L., "A Cost-Benefit Analysis for Air Layer Drag Reduction", Proceedings of International Conference on Ship Drag Reduction (SMOOTHSHIPS) (2010)
- Ceccio, S. L., "Air Lubrication Drag reduction on Great Lakes Ships", Great Lakes Maritime Research Institute, A University of Wisconsin – Superior and University of Minnesota Duluth Consortium, ~ (2012)
- 장진호, "Experimental investigation of frictional resistance reduction with air layer on the hull bottom of a ship", International Journal of Naval Architecture and Ocean Engineering, 6(2), pp.363~379 (2014), 대한조선학회
- Kim, H. -J., "Numerical Study on the Bifurcation Mechanism of Air Layer on a Flat Plate", Proceedings of International Workshop on Ship and Marine Hydrodynamics (2017)
- Mäkiharju, S. A., "On Multi-point Gas Injection to form an Air Layer for Frictional Drag Reduction", Ocean Engineering, 147, pp.206~214 (2018)[DOI]
- Mäkiharju, S. A., "The Topology of Gas Jets Injected Beneath a Surface and Subject to Liquid Cross-flow", Journal of Fluid Mechanics, 818, pp.141~183 (2017)[DOI]
- 양해욱, "CFD를 이용한 모형선과 실선 스케일의 반류 비교", 대한조선학회 논문집, 47(2), pp.150~162 (2010), 대한조선학회