Computational Investigation into Predicting Total Resistance of Axe-Bow Ship’s in Calm Water
DOI:
https://doi.org/10.37934/cfdl.15.11.115Keywords:
Axe-bow, total resistance, pressure resistance, viscous resistance, CFDAbstract
The axe-bow ship design has been primarily introduced to minimize ship's slamming condition during sailing, which inherently deals with sufficient of her total ship's resistance. The presence of nonlinear-hydrodynamic flow behaviours around the ship will forcefully impose pressure and viscous resistances on her hull. This complex phenomenon is so intricate that a reliable approach leading into more feasible prediction of her total ship’s resistance (RT) is necessarily required, while explaining the rationale behind the analysis results. This paper presents a computational investigation into prediction total ship's resistance of an axe-bow hull in the calm water condition. Here, the Computational Fluid Dynamic (CFD) software called Numeca Fine Marine was accordingly used. Several parameters such as various Froude numbers (Fr) and trim's angles, have been taken into account in the computational simulations. The results showed that the viscous ship’s resistance has more relatively significant influence on the axe-bow ship than the pressure ship’s resistance especially at Fr ≥ 0.568. It is noteworthy that this causes the pressure resistance coefficient (CP) decrease indicated with moderately diminished high-pressures acting on the axe-bow ship’s hull. The increase of the trim’s angle demonstrates that the existence of the higher turbulent viscosity extends over the entire submerged hull surfaces and causes reduction of the viscous coefficient (CV). In general, the subsequent increase of Froude number and the trim’s angle were proportionally to the total ship’s resistance. It can be concluded that the current computational results are useful as preliminary prediction of the total ship’s resistance towards determining the effective power.
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