A Fast Algorithm for the Prediction of Ship-Bank Interaction in Shallow Water

Abstract

The hydrodynamic interaction induced by the complex flow around a ship maneuvering in restricted waters has a significant influence on navigation safety. In particular, when a ship moves in the vicinity of a bank, the hydrodynamic interaction forces caused by the bank effect can significantly affect the ship’s maneuverability. An efficient algorithm integrated in onboard systems or simulators for capturing the bank effect with fair accuracy would benefit navigation safety. In this study, an algorithm based on the potential-flow theory is presented for efficient calculation of ship-bank hydrodynamic interaction forces. Under the low Froude number assumption, the free surface boundary condition is approximated using the double-body model. A layer of sources is dynamically distributed on part of the seabed and bank in the vicinity of the ship to model the boundary conditions. The sinkage and trim are iteratively solved via hydrostatic balance, and the importance of including sinkage and trim is investigated. To validate the numerical method, a series of simulations with various configurations are carried out, and the results are compared with experiment and numerical results obtained with RANSE-based and Rankine source methods. The comparison and analysis show the accuracy of the method proposed in this paper satisfactory except for extreme shallow water cases.

Estimation of Maneuverability of Trawl Fishing Vessel Using an Analytical Method

“…As the present study focused on validating the performance of the modified empirical formula, we intend to build upon the results obtained here to conduct more detailed studies on the bank effect and ship-to-ship [28,29] comparisons of fishing vessels' hull forms in the future. Such a study would serve as a good indicator for those who operate fishing vessels and play an important role in analyzing maritime accidents should they occur.…”

Prediction of Maneuverability in Shallow Water of Fishing Trawler by Using Empirical Formula

“…Studies on the prediction of the maneuverability of fishing vessels have been carried out by Yoshimura [14][15][16][17], Dan [18], Lee [3,4,19], Kim [2,5,20], etc. [21][22][23][24][25][26][27], but a lot of research is still required.…”