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. http://www.transnav.eu the International Journal on Marine Navigation and Safety of Sea Transportation Volume 12 Number 4

Estimation of the hydrodynamic parameters of USVs for velocity prediction using a hybrid adaptive strategy

“…In general, the methods of estimating hydrodynamic parameters may be classified into four types: the empirical formula method (Wang et al , 2019), the computational fluid dynamics (CFD) method (He et al , 2016; Jin et al , 2016; Liu et al , 2018; Zhang et al , 2019), the captive model experiment method (Park et al , 2017; Xu et al , 2017) and the parameter identification method (Forrest et al , 2018; Kiselev et al , 2017; Sabet et al , 2017). Though the methods mentioned above achieve general performance, each method has weaknesses for parameter estimation.…”