Unlike the general vessels, Planing crafts have been widely used in leisure activities in coastal area and marina resort. Planing Hull is mainly supported by the lift force when traveling in a high speed, however, Planing Hull has a negative effects on the passengers those who want to enjoy marine leisure partly because of the shock and vibration due to the bow waves in the case of high speed.
To overcome these negative effects of Planing hull, advanced hull form, such as VSV(Very Slender Vessel)(Thompson, 1997) and TH(Transonic hull)(Calderon and Hedd, 2011), have been introduced recently.
These high speed hull forms which have a good wave-piercing performance are practically used partly, but systematic studies on these hull form are not well established compared to other hull forms, and a little work has been done on this subject.
VSV has chine and wedge-shaped on bow so that can break through the bow waves in a high speed and stern shape is like that of a planing hull. On the other hand, TH has a wedge-shaped on bow like a VSV, while TH has the box shape on bottom area contrasted with VSV. In TH’s case, TH has been known for poor transverse stability beacause of high center of gravity and insufficient securement of displacement due to shallow draft in stern.
Jeong et al(2016) have developed a new wave-piercing high-speed planing hull form without chines, and they applied spray rails on the stern in order to improve the resistance performance by studying according to changes in the running attitude through model testing.
In this research, we checked the spray phenomenon occurring aft side of the numerical analysis of wave-piercing high-speed planing hull developed by Jeong et al(2016), and predict as lengths of spray rail and chine for suppressing spray and motion control.
The performance of CFD simulations of planing hulls is evaluated by commercial software, STAR-CCM+. The Reynolds averaged Navier-stokes equations wih the SST k-w turbulence model was used along with the volume of fluid method to descibe the two-phase flow of water and air around the hull. Furthermore, Running altitude of Planing hull was used with overset method.