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Numerical study of the effect of river-sea ship hull form parameters on resistance and their optimisation using the Taguchi-grey method

Tu Tran Ngoc, Le Tat Hien, Thien Doan Minh, Tao Tran Van, Ngoc Vu Minh

Polish Maritime Research

2025

nr 2

17--28

In this paper, we systematically investigate the effect of the five most important ship hull form parameters, namely the longitudinal centre of buoyancy (LCB), the half angle of entrance of the design waterline ((½))αE), and the length (CLPR), cross-section (CABT) and volume (C ΔPR) parameters for the bulbous bow on the ship resistance using a computational fluid dynamics method. The parent ship hull form investigated in this study is a 4600DWT cargo ship, which operates on Vietnam’s river-sea routes. To save time and reduce costs, only 25 test cases designed with the orthogonal array Taguchi method are simulated, and the resistance is calculated in deep and shallow water at speeds of 10.0 and 9.0 knots, respectively. The optimal combination of the five ship hull form parameters is obtained using Taguchi-grey relational analysis. The results indicate that the optimum ship hull form depends on the water depth, and that LCB is the most critical parameter in regard to resistance. Of the combinations studied here, the variant with (½)αE=42°, CLPR=0.0141, CABT=0.1600, C ΔPR=0.00173, LCB=48.654%LBP is found to be optimal.

Numerical study of the scale effect on flow around a propeller using the CFD method

Van-Vu Huynh, Le Tat-Hien, Thien Doan Minh, Tao Tran Van, Ngoc Tu Tran

Polish Maritime Research

2024

nr 2

59--66

This paper presents an investigation of the scale effect on the flow around a propeller using the CFD method. The differences in the numerical setup and the results obtained for the characteristics of an open water propeller are described and analysed in this paper. Moreover, the paper also highlight and analyse the scale effect on differences in flow around the propeller, such as the pressure fields in the cross section, the distributions of the skin friction coefficient and limiting streamlines on the propeller blade, the vortices in the wake of the propeller, and the velocity fields. The differences in the flow around the propeller are more clearly seen when it works under heavy loading conditions, an important finding that can support designers in improving propeller performance, investigating cavitations, etc. at the full scale. The reference propeller used in this study is the benchmark propeller PPTC VP 1304.