Numerical Study of Hydrodynamic Derivatives and Course Stability under Ship-Bank Interaction

• Main Authors: Han Liu, Ning Ma, Xiechong Gu
• Format: Article
• Language: English
• Published: Gdynia Maritime University 2018-12-01
• Series: TransNav: International Journal on Marine Navigation and Safety of Sea Transportation
• Subjects: Safety at Sea; Ship-Bank Interaction; Reynolds-Averaged Navier-Stokes (RANS); Hydrodynamic Derivatives; Hydrodynamics; Planar motion Mechanism (PMM); Circulating Water Channel (CWC); User Defined Functions (UDF)
• Online Access: http://www.transnav.eu/files/Numerical Study of Hydrodynamic Derivatives and Course Stability under Ship-Bank Interaction,861.pdf
• ISSN: 2083-6473; 2083-6481

Since ship-bank interaction affects the manoeuvrability of a ship navigating close to a bank, the determination of hydrodynamic derivatives is of great importance to assess the ship manoeuvrability. To obtain the hydrodynamic derivatives of the KVLCC2 model ship with different water depths and ship-bank distances, the simulation of PMM tests are carried out using an unsteady Reynolds-Averaged Navier–Stokes (RANS) based solver. Hybrid dynamic mesh technique is proposed to realize the simulation of pure yaw tests in confined water. Studies on the grid convergence and time-step-size convergence are firstly performed. Hydrodynamic derivatives for the ship in different water depths and ship-bank distances are compared. The course stability is investigated based on time-domain simulations and eigenvalue analysis, and the results show that the ship-bank interaction and shallow water effect have a remarkable influence on the course stability.