Planing hulls, commonly used in many areas, have different hydrodynamic behavior than the displacement even calm water. Therefore, this makes calculation of maneuvering parameters these hulls appealing. In present study, a planing hull's numerical static drift analyses are performed using unsteady RANS approach to evaluate sway force and yaw moment at angles attack advance velocities. The resul...

Porpoising is defined as unstable coupled heave and pitch motions. In this study, seven test conditions with various longitudinal locations of the center gravity moment inertia were designed to study porpoising phenomenon a tunnel-type planing trimaran. After comparing lower speed limit for porpoising, revealed that moving forward could increase but it also amplitude pitch. Furthermore, reducti...

In this paper, a CFD analysis on the bare hull form of submarines or torpedoes for minimizing the resistance is represented. There are several parameters in submarine form design which the most important parameter is resistance. All operational characteristics of submarines are related to the resistance, related required power and then, underwater speed and range. Other parameters are only ment...

Previous theories and empirical formulas for the lift of flat planing surfaces are reviewed, and the resemblance of the planing surface to the airfoil noted. A simple expression, which converges to the correct limits for exactly known cases, is assumed for the ratio of planing to airfoil lift, and the planing lift is then estimated by using airfoil experimental data. The resulting calculated va...