Hydrodynamic drag reduction of a Surface Ship through Optimized Bulbous Bow. | [Proceedings 6th International Bhurban Conference on Applied Sciences and Technology • 2009]

Author(s):

1. Shakeel Ahmed: National Engineering & Scientific Commission (NESCOM), Islamabad, Pakistan

2. Hafeez Ahmad: National Engineering & Scientific Commission (NESCOM), Islamabad, Pakistan

3. Saeed Akram Malik: National Engineering & Scientific Commission (NESCOM), Islamabad, Pakistan

4. Shahid Mashhood: National Engineering & Scientific Commission (NESCOM), Islamabad, Pakistan

Abstract:

The present study is an effort towards hull form optimization of a surface ship in order to reduce hydrodynamic drag by using general purpose CFD solver FLUENT which uses finite volume method. In the outset, the paper highlights the importance of the resistance and powering calculation of surface vessel and recent CFD contribution towards reduction in the drag via shape optimization of hull form. The paper is divided into two parts. The first part describes the CFD strategy applied for the resistance analysis of initial/parent hull form. MAXSURF software is used for 3D modeling of ship hull and computational grid is created in GAMBIT software. FLUENT’s VOF multiphase technique for free-surface capturing together with standard k-w model is used for the simulations. The results are analyzed from both qualitative and quantitative perspective. Qualitative results show realistic pressure distribution on the ship hull with similar wave pattern in the vicinity of hull as in experiments. Quantitative comparison of the results obtained by FLUENT and PARAMARINE in terms of effective power shows good agreement. From the CFD results, it is concluded that at high speeds wave making resistance accounts for major contribution to the total drag of hull form. In the second part of the study, the whole emphasis is focused towards the development of an optimized hydrodynamic bulbous bow, which will be most effective for drag reduction both at cruising and top speeds. Comparison is made between the initial hull with that of integrating bulbous bow. The progressive optimization of bulb design of the bow bulbs depicts that most optimized bulb design provides about 7-8% decrease in the effective power.

Page(s): 275-283

DOI: DOI not available

Published: Journal: Proceedings 6th International Bhurban Conference on Applied Sciences and Technology , Volume: 1, Issue: 0, Year: 2009

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