Fast mono-wave-piercing craft (Fast Mono-WPC) use a tumblehome design and run at high speeds. Efforts have been made to study hull wetness problems because of the special hull shape and running state of Fast Mono-WPC. Numerical and experimental methods were adopted to study hull wetness problems of Fast Mono-WPC both in calm water and waves. Numerical methods were based on RANS. Dynamic mesh methods were used to simulate model motions. Influence of velocity, spray strips and hull motions on hull wetness of Fast Mono-WPC in calm water was studied. Results of CFD and EFD in calm water show that hull wetness of Fast Mono-WPC is sensitive to hull motions such as heave and pitch, and spray strips on the bow can reduce hull wetness. Model tests in regular and irregular waves and numerical simulations in regular waves of a free Fast Mono-WPC model were conducted at a high Froude number, Fn = 0.815. Numerical results show that wetness is slight when Fast Mono-WPC runs in 1L-long and 4L-long waves, and water climbs up the freeboard to the deck when Fast Mono-WPC cuts through 2L-long waves. Serious hull wetness was also experimentally observed both in regular and irregular waves.

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