Numerical modelling of moored vessel motions caused by passing vessels

This paper presents the results of the establishment and calibration of a numerical modeling approach for simulating moored ship motion s induced by the drawdown from a passing vessel. The numerical modeling approach consisted of a one - way coupling of a finite volume Reynolds averaged Navier - Stokes model calculating the drawdown, and a linear diffraction-radiation model calculating the moored vessel motions in response to the incident hydrodynamic flow field in the time domain . The model domain represented a 0.5 km wide river basin with a maximum water depth of 11.1m. Identical hull geometries were used for the moored vessel and the passing vessel, representing oil tankers with a L OA of 20 0.4 m and a displacement of 46 ,900 m3. The mooring system consisted of linear lines and bollards. Calibration of the models was undertaken by comparison with results from physical modeling of different combinations of vessel passing distances, passing speeds and moored vessel line pre -tensions. The predicted moored vessel motions showed to be in excellent agreement with physical model test data, which meant that the models could be confidently used.