Title: Numerical and statistical analysis of the influence of a stern wedge on running attitudes of non-stepped and stepped hulls

Authors: Mohammad Sheikholeslami; Parviz Ghadimi; Farzan Kiani

Addresses: Department of Maritime Engineering, Amirkabir University of Technology, Hafez Ave, No. 424, P.O. Box 15875-4413, Tehran, Iran ' Department of Maritime Engineering, Amirkabir University of Technology, Hafez Ave, No. 424, P.O. Box 15875-4413, Tehran, Iran ' Department of Maritime Engineering, Amirkabir University of Technology, Hafez Ave, No. 424, P.O. Box 15875-4413, Tehran, Iran

Abstract: The effects of a stern wedge on the running attitudes of a baseline and stepped planing hull are hereby investigated. Four planing models including the baseline, wedge-mounted, stepped, and wedge-mounted stepped are simulated and the linearity of the total drag with speed is statistically analysed. This study demonstrates that the stern wedge reduces the trim angle by up to 37% in the baseline model and 41% in the stepped model. It increases friction drag by 20% in the baseline and 15% in the stepped model, while its impact on total and pressure drag is similar for both. The only running attitude of these two models that is differently affected by the stern wedge is the rise-up. Statistical analysis indicates that limiting the model to the planing regime and excluding data taken from the displacement and semi-planing regimes, can make the linear model more reliable.

Keywords: planing hull; transverse step; stern wedge; drag components; cougar; statistical analysis.

DOI: 10.1504/PCFD.2025.147797

Progress in Computational Fluid Dynamics, An International Journal, 2025 Vol.25 No.4, pp.213 - 226

Received: 27 Feb 2024
Accepted: 25 Oct 2024
Published online: 01 Aug 2025 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article