Session: 15-01-02 Seakeeping and Operability

Submission Number: 180988

Study on the Prediction Method for Maneuvering Motion of Large Ships in Non-Uniform Currents Within Restricted Waters 

Abstract:

The low-speed maneuvering performance of large ships under the influence of non-uniform current fields has been a research focus for scholars worldwide. However, traditional MMG mathematical prediction methods treat the ship's lateral hydrodynamic coefficient Cd as a constant, which has limitations. This study employs STAR-CCM+ software to conduct high-precision numerical simulations based on the KVLCC standard model for parametrically defined non-uniform current conditions (defining parameters: maximum current velocity, velocity profile shape, non-uniformity gradient, length of current field region). The sample size is then expanded using interpolation methods to form a dataset. Furthermore, a self-programmed mathematical model for ship maneuvering motion is established, which considers the non-uniform distribution of current along the ship's length. This model integrates the lateral hydrodynamic coefficient Cd obtained from CFD calculations to compute the cross-flow force term in the motion equations, enabling a more accurate prediction of large ship motion in non-uniform current fields. By comparing traditional prediction methods, the study quantitatively analyzes the impact of CFD data fusion on the straight-line and turning motions of ships under the complex condition of non-uniform current distribution along the hull. On this basis, the influence law of the ununiformity of ocean currents on the maneuvering behavior of large ships was further clarified. Consequently, the results offer a novel methodology for predicting the motion of large ships in restricted waters.

 

Keywords: Ship Motion; MMG Model; CFD Data Fusion; Cross Flow Theory; Non-Uniform Current

* Corresponding author.

E-mail address:   wangzd_just@163.com (Z-D Wang).

This work was supported by the NSFC under Grant No. 52572407

Presenting Author: Tian-Chi Yang Jiangsu University of Science and Technology

Presenting Author Biography: He is a doctoral student majoring in Ship and Ocean Engineering at Jiangsu University of Science and Technology. His research focuses on the hydrodynamic performance of large ships in complex environments, with a particular emphasis on the prediction of ship maneuvering movements based on high-precision numerical models. The content of this presentation is a part of his doctoral thesis research.

Authors:

Tian-Chi Yang Jiangsu University of Science and Technology
Zhi-Dong Wang Jiangsu University of Science and Technology
Hong-Jie Ling Jiangsu University of Science and Technology
Zi-Wei Yao Jiangsu University of Science and Technology