eng Science and Education Publishing American Journal of Mechanical Engineering 2328-4110 2016-11-07 4 6 218 225 10.12691/ajme-4-6-3 AJME2016463 article Hassan Ghassemi gasemi@aut.ac.ir 1 Hamid Forouzan 1 Department of Maritime Engineering, Amirkabir University of Technology, Hafez Ave, No 424, P.O. Box 15875-4413, Tehran, Iran This paper is presented a combined method to design of the twin-waterjet propulsion system for high-speed craft (HSC). First, a practical approach employed to obtain the main data of the geometry of waterjet system. Thrust of the system is calculated by the momentum theory. Next, RANS solver is performed with the realizable k- turbulence model. The numerical results of the pressure distribution coefficient, thrust coefficient and the flow field inside the duct are presented and discussed. http://pubs.sciepub.com/ajme/4/6/3/ajme-4-6-3.pdf twin-waterjet practical and numerical method pressure and thrust coefficients