الفهرس 
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Abstract
Reduction of fuel consumption on shipboard is an issue of great concern environmentally and economical wise, a lot of proposals and different strategies have been imposed to reduce fuel consumption onboard ships, one of these is air lubrication technique .The air lubrication concept depends on ship bottom lubrication by dissolving small air bubbles which act in reduction of friction resistance . This method can applied to exist-ing ships without modification or addition of construction details in ship’s hull, which is a benefit for smooth application.
In this thesis, Computational Fluid Dynamic software (FLUENT) has been used for simulation and analytical study. Validation was achieved on a flat plate and Series 60 model. Air lubrication method was used to en-sure the effect of micro-bubbles on total resistance. A numerical 3D Mod-el for a general cargo ship has been modeled and used for calculations and comparison study for the application of Air Lubrication strategy. The analysis were carried out in ballast and loading conditions for different velocities. The overall results suggest that micro-bubbles had great effect on the ballast condition and good effect on loading condition. In ballast condition total resistance reduction ratio reached to 10%, and 4% in load-ing condition. Consequently, air lubrication method had good effect on reduction of fuel consumption can approaches 8.7 % in ballast condition and 2.7% in loading condition for a vessel with simulated dimensions.