Calculating the hydrodynamic Coefficients of the Hull and Propeller of Dhow Vessel Using Numerical Self-Propulsion Test

Dhow vessels are traditional vessels used for fishing or cargo transportation on short and medium routes, and according to statistics, more than 4,000 of these vessels operate in Iranian ports.These vessels use diesel engines and fixed-pitch propellers for propulsion.The design and selection of the propulsion system of these vessels is done entirely empirically, and in most cases, even the resistance and hull form of these vessels are not considered in the design of the propulsion system and propeller, which causes the propulsion system to not operating with optimum efficiency.In this paper, initially, numerical modeling of the resistance of a dhow vessel was performed using the computational fluid dynamics method.Then, by performing a self-propulsion test using the numerical method, the hydrodynamic coefficients of the hull and propeller of the vessel were calculated.The results of this research show that the thrust deduction factor for this vessel is 0.291 and the wake coefficient of a hull is 0.18.Further research on the hydrodynamics of this vessel can help in selecting a propeller and propulsion system with better efficiency and lower fuel consumption.