Sharif University of Technology Scientia Iranica 1026-3098 29 3 2022 06 01 Experimental and numerical investigation of the effects of incorporation of one and two steps to a mono-hull planing vessel on its performance in calm water 1169 1184 22562 10.24200/sci.2021.57177.5101 EN P. Ghadimi Department of Maritime Engineering, Amirkabir University of Technology, Tehran, P.O. Box 15875-4413, Iran S. M. Sajedi Department of Maritime Engineering, Amirkabir University of Technology, Tehran, P.O. Box 15875-4413, Iran A. Ghadimi Department of Maritime Engineering, Amirkabir University of Technology, Tehran, P.O. Box 15875-4413, Iran M. Sheikholeslami Department of Maritime Engineering, Amirkabir University of Technology, Tehran, P.O. Box 15875-4413, Iran Journal Article 2020 11 15 In the current study, two different vessels with a single step and two steps are experimentally and numerically studied. The considered speeds are 8 and 9 m/s, equivalent to beam Froude numbers of 3.44 and 3.86. The experimentally measured parameters include bow rise-up, trim, and vessel’s resistance. On the other hand, numerical simulations of fluid flow around the vessel at 10 m/s and 12 m/s speeds are conducted using STAR-CCM+ software. Two-phase flow is analyzed using finite volume method and volume of fluid technique. Moving mesh approach through the Overset technique is applied for discretization of the domain. Based on the experimental results, it is observed that addition of the transverse step enhances the vessel’s stability and reduces its trim. It is also concluded that the resistance of a single stepped high-speed vessel reduces, compared to a vessel of without step. Meanwhile, numerical studies indicate that as the second step moves away from the transom, the resistance increases, and trim decreases. It is also concluded that both single-step and two-step models are stable at speeds up to 12 m/s. https://scientiairanica.sharif.edu/article_22562_68ea8e40d02a6c727a333bae8445c46b.pdf