In this research, we have calculated characteristics of wave-piercing high-speed planing hull, by using a RANS solver and overset grid method, for comparing with experimental measurements of that and simulating with several appendages, since the computed results of commercial CFD code look reasonable for the prediction of the performances of planing hulls on calm water in planing conditions. As a result, it is confirmed that the dynamic instability phenomena in pitch and heave motions (porpoising) occurred after a certain FnV, and effectively suppressed using some of appendages, especially the 0.5L spray rail is suppressed to 24-55 % in the pitch motion and 33-55 % in the heave motion. In spray phenomenon, 1L hard chine suppress spray effectively and it is effective to set the angle of appendages to be less than 0° in order to suppress wave.

• Sang-Won Kim(Dept. of Ocean System Engineering, Graduate School, Mokpo National Maritime University, Mokpo 58628, Korea)
• Kwang-Cheol Seo(Dept. of Naval Architecture and Ocean Engineering, Mokpo National Maritime University, Mokpo 58628, Korea)
• Dong-Kun Lee(Dept. of Naval Architecture and Ocean Engineering, Mokpo National Maritime University, Mokpo 58628, Korea)
• Gyeong-Woo Lee(Dept. of Naval Architecture and Ocean Engineering, Mokpo National Maritime University, Mokpo 58628, Korea) Corresponding author