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Numerical Study of the Effect of Extreme Trim on Fuel Consumption and Seakeeping of a Tanker in Waves

Raeisi, Ehsan | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57102 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Khorasanchi, Mahdi
  7. Abstract:
  8. The fuel consumption of displacement ships is one of the vital and sensitive issues in the marine transportation industry, which affects all economic and environmental aspects. There are few important parameters for displacement ships that can be changed and optimized to reduce fuel consumption and the resulting pollutants. In this study, extreme trim has been selected as one of these important parameters and it has been studied numerically using Star CCM+ software. It should be noted that the extreme trim approach is used when returning from a trip (when there is no load). The results obtained in the extreme trim mode showed a decrease of 26.76% in the resistance of the KVLCC2 tanker-ship model in calm water and a 42.74% decrease in the wave resistance with a characteristic of L_pp/λ =1.09 compared to the level trim mode. In addition, the results of the ship self-propulsion test in calm water and in the wave with extreme trim showed a decrease of 1.83 and 24.54 percent in propeller revolution compared to the level trim state. Finally, for the tanker-ship moving with a speed of 0.81 m/s in the wave, the delivered power has been reduced by 56.87 percent. Also, the pressure changes on the hull in level trim and extreme trim mode have been investigated, and in the extreme trim mode, the pressure of the wave slam on the flat bottom of the vessel has increased by 20% compared to the level trim mode
  9. Keywords:
  10. Tensile Test ; Self Propulsion Test ; Extreme Trim ; Fuel Consumption ; Tanker Ship ; Seakeeping Increase

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