Abstract

Maneuverability is an important hydrodynamic performance of a ship, and should be taken into account during the ship design stage. The present study of Computational Fluid Dynamic (CFD) calculations aims to offer a numerical tool for maneuvering prediction with high accuracy. The virtual captive model tests for a model scale KCS container ship are conducted using unsteady Reynolds-averaged Navier–Stokes (RANS) computation to obtain the full set of linear and nonlinear hydrodynamic derivatives in the 3rd-order Abkowitz model. The numerical uncertainty analysis is carried out for the pure sway and yaw–drift tests to verify the numerical accuracy. It is concluded that the lower order Fourier coefficients are preferred in the computation of the hydrodynamic derivatives. Moreover, part of the computed hydrodynamic forces and moments are compared with the available captive model test data, and good agreement is obtained. By substituting the computed hydrodynamic derivatives into the mathematical model, the standard turning and zigzag maneuvers are predicted. By comparing the predicted maneuvering results with the available experimental data and the prediction results by others, it is demonstrated that acceptable prediction accuracy can be achieved with the present method, which shows the effectiveness of the present method in predicting ship maneuverability.

Highlights

  • Maneuverability is an important hydrodynamic performance of a ship

  • The present study aims to predict KCS ship’s maneuverability using the Abkowitz model with the full set of linear and nonlinear hydrodynamic derivatives all determined by virtual captive model tests

  • A full set of 65 linear and nonlinear hydrodynamic derivatives in the 3rd-order Abkowitz model are determined from the virtual captive model test

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Summary

Introduction

Maneuverability is an important hydrodynamic performance of a ship. The International Maritime Organization (IMO) has promulgated the Standards for Ship Manoeuvrability (IMO, 2002) to ensure the safety of navigation. The advantage of the captive model test is that it can obtain all the linear and nonlinear hydrodynamic coefficients in the mathematical model It has some drawbacks, such as the fact that specific test facilities are required, and it is not convenient for the evaluation and optimization of ship maneuverability at the design stage. To verify the reliability of CFD-based tools in maneuvering predictions better, more numerical simulations are needed to expand the database Under this background, the present study aims to predict KCS ship’s maneuverability using the Abkowitz model with the full set of linear and nonlinear hydrodynamic derivatives all determined by virtual captive model tests. By using the hydrodynamic derivatives determined from the virtual captive model tests, simulations of standard maneuvers are carried out and the results are compared with FRMT and CFD-based prediction results in the literature to validate the present numerical method and the established mathematical model

Coordinate systems
The Abkowitz model
Captive model tests
Computation of the hydrodynamic derivatives
Numerical method
Ship model
Computation cases
Computational domain and boundary conditions
Mesh generation
Numerical uncertainty analysis
Hydrodynamic forces and moments
Simulation of the standard maneuvers
67.18 N’uuδ m’
Conclusions
Full Text
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