An unconventional small water-plane area twin-hull (SWATH) ship with inclined struts was investigated by numerical methods. The seakeeping performance was studied firstly based on the three-dimensional potential flow theory with considering viscous damping. The results show that the SWATH ship with inclined struts demonstrates improved seakeeping performances by comparison with a vertical-strut SWATH ship and the Delft 372 catamaran. Fully considering the viscous condition, 3D numerical simulations based on the Reynolds-averaged Navier-Stokes (RANS) equation and overset mesh method are carried out both in calm water and head regular waves. As negative added resistance is observed in the computational results, it can be concluded that the inclined struts could make use of wave energy to give rise to a reduction of power required in waves.
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