Numerical investigation of the added resistance of a twin-hull ship equipped with a stern wedge in a regular wave

Document Type : Original Article

Authors

1 Master's degree, Babol Noshirvani University of Technology, Babol, Iran

2 Assistant Professor, Babol Noshirvani University of Technology, Babol, Iran

3 Professor, Babol Noshirvani University of Technology, Babol, Iran

Abstract

In the current study, dynamics of a twin-hull ship has been evaluated in regular waves. Numerical solution has been done using the Reynolds-Averaged Navier-Stokes equations and the interDyMFoam solver of openFoam open-source code. The results of the numerical solution in calm water present acceptable agreement with the published experimental data. The maximum speed of the ship in calm water is equivalent to Froude Number=0.747 and assuming the maximum engine power is constant, the ship has been able to reach a speed equivalent to the Froude Number=0.274 in waves. Although the presence of the wedge in calm water has caused the lift force and the control of longitudinal instabilities, but the same wedge has caused pressure imbalance at a lower speed and in a state where the ship is moving in waves. The result of the forces acting on the ship in the waves has led to an increase in the range of heave and pitch motions (5 and 7 percent respectively) for the body equipped with a wedge, which is a weak point for the ship equipped with a wedge. Installing the wedge has increased the added resistance in waves by 4.26%. Although, the addition of the wedge has reduced the longitudinal instability in calm water at design speed, but for this ship it was proven that the addition of the wedge leads to the deterioration of the ship dynamics in waves. So, a controllable angle stern wedge could be installed to have the best performance in all conditions.

Keywords

Fluid Mechanics & Aerodynamics
Volume 13, Issue 2 - Serial Number 33
Autumn and winter 2024
November 2024

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History

  • Receive Date: 15 July 2024
  • Revise Date: 04 October 2024
  • Accept Date: 12 November 2024
  • Publish Date: 01 December 2024

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