American Journal of Mechanical Engineering
ISSN (Print): 2328-4102 ISSN (Online): 2328-4110 Website: http://www.sciepub.com/journal/ajme Editor-in-chief: Kambiz Ebrahimi, Dr. SRINIVASA VENKATESHAPPA CHIKKOL
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American Journal of Mechanical Engineering. 2017, 5(1), 14-17
DOI: 10.12691/ajme-5-1-3
Open AccessArticle

Analysis of Bow and Aft Modification Effect on DTMB 5115 Ship Resistance

Karim Akbari Vakilabadi1, and Hojat Motahari2

1Department of Marine Faculty, Imam Khomeini Maritime University, Noshahr, Iran

2Department of Marine Faculty, Imam Khomeini Maritime University, Tonekabon, Iran

Pub. Date: January 13, 2017

Cite this paper:
Karim Akbari Vakilabadi and Hojat Motahari. Analysis of Bow and Aft Modification Effect on DTMB 5115 Ship Resistance. American Journal of Mechanical Engineering. 2017; 5(1):14-17. doi: 10.12691/ajme-5-1-3

Abstract

Resistance reduction is the most important goal in ship design that causes higher speed and lower fuel consumption. Hydrodynamic optimization is an effective and robust design method that plays an indispensable role in ship hull form optimization. Designers and shipyards are required to produce vessels according to draft and speed specifications which have superior hydrodynamic performance under calm water conditions (the contract condition), and the optimization of ship hull designs is a vital part of achieving this goal. Resistance value of DTMB 5415 model has been measured by Maxsurf software and compared with CD Adabco Stare-CCM+ CFD based software results. These methods are used to compare the calm-water drags of several bow and aft forms and to define optimized hull for which the total (friction + wave) calm-water drag is minimized. The total drag is estimated using Holtrop method in Maxsurf. Comparisons of CFD calculations and experimental measurements for DTMB 5415 hull form show that CFD calculations are reliable. Bow type has been replaced with bulb and few changes have been done on aft that has better behavior than other types of aft on resistance and total resistance on hull has been decreased with replaced bulb and modified aft.

Keywords:
resistance bulbous-bow hull form DTMB 5415

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