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

Abstract

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.

Keywords

• 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)