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Volume 5 - Winter and Spring 2016                   ijmt 2016, 5 - Winter and Spring 2016: 55-62 | Back to browse issues page

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Kazemi Moghadam H, Shafaghat R. Numerical Investigation on the Effect of Tunnel Height on Drag Reduction in a High Speed Trimaran. ijmt. 2016; 5 :55-62
URL: http://ijmt.ir/article-1-504-en.html
1- Babol Noshirvani University of Technology
Abstract:   (5653 Views)

There are different methods to reduce drag in high speed hulls. One of these methods is a change in the shape of the body by adding longitudinal side tunnels. In this paper it has been attempted to determine the influence of the tunnel height on hydrodynamic characteristics of the hull to achieving an optimum shape for the tunnel. To achieve this purpose, numerical simulation of the problem has been done using finite volume method considering moving mesh. For turbulence modeling, k-ε model and to simulate free surface, the Volume of Fluid (VOF) two phase model has been employed. The results show that creating a tunnel in the base mono-hull would lead to reduction of the total drag at high speed as well as decreasing the vessel draft of the hull over the whole range. Furthermore, in the Volumetric Froude number around 4, a reduction in the height of the tunnel could decrease the hull drag. In higher Volumetric Froude numbers, reduction of the tunnel height, to some extent, increases the drag with a slight slope.

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Type of Study: Research Paper | Subject: Numerical Investigation
Received: 2016/02/15 | Accepted: 2016/03/15

1. Weijia Ma, Huawei Sun, Jin Zou, Heng Yang: Test research on the resistance performance of high-speed trimaran Planing hull, Polish maritime Research, No 4/2013.
2. Yousefi R, Shafaghat R, Shakeri R: High-speed Planing hull drag reduction using tunnels, Ocean Engineering 84 (2014) 54–60.
3. Ghassabzadeh M, Ghassemi H: Determining of the hydrodynamic forces on the multi-hull tunnel vessel in steady motion. J Braz. Soc. Mech. Sci. Eng. DOI 10.1007/s40430-013-0110-2,2014.
4. Ghassabzadeh M, Ghassemi H: Numerical Hydrodynamic of Multihull Tunnel Vessel. Open Journal of Fluid Dynamics, 2013, 3, 198-204,2014.
5. Hailong SHEN, Wei Lu and Yumin SU: Numerical Prediction Method of Resistance Performance of Catamaran Planing Vessels, Applied Mechanics and Materials Vol. 344 pp 19-22,2013.
6. K Muljowidodo and et al. Design and simulation analysis of flying trimaran USV. Indian Jurnal of Geo-marian science. Indian Jurnal of Geo-marine Sciences, Vol. 41 (6), pp. 569-574,2013.
7. Hamid Kazemi Moghadam, Rouzbeh Shafaghat, Reza Yousefi, Numerical investigation of the tunnel aperture on drag reduction in a high-speed tunneled planing hull, J Braz. Soc. Mech. Sci. Eng , Volume 37, Issue 6, pp 1719-1730, 2015.
8. A. Najafi, S. Alimirzazadeh, M. Seif, RANS simulation of interceptor effect on hydrodynamic coefficients of longitudinal equations of motion of planing catamarans, J Braz. Soc. Mech. Sci. Eng. 37:1257–1275, 2015.
9. Yousefi R, Shafaghat R, Shakeri M: Hydrodynamic analysis techniques for high-speed Planing hulls, Applied Ocean Research 42 105–113,2013.
10. Savitsky, D: Hydrodynamic analysis of Planing hulls. Mar. Technol. 1 (1), 71–95,1964
11. Website: http://www.icemarine.com/models/

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