Abstract

The present work is focused on the numerical simulation of an oblique towed ship using Unsteady Reynolds Averaged Naver-Stokes(URANS) method. The numerical computations are carried out by using the solver naoe-FOAM-SJTU, which is developed for ship and ocean engineering based on the open source code OpenFOAM. A new 6DOF module has been extended to the solver to accurately simulate the static drift test (oblique towing test). The main purpose of this research is to investigate the capability of our solver for ship maneuvering prediction especially for steady oblique tow. During the process, a series of simulations are carried out due to different drift angles. The computations are performed for a bare ship hull model free to sink and trim at Froude number 0.24. The hydrodynamic forces and moments acting on the ship as well as the hydrodynamic derivatives are obtained for further analysis. All the above numerical results have been compared to those of the oblique towing test with a Planar Motion Mechanism (PMM) system performed at Marine Design & Research Institute of China. Taking free surface into consideration and using viscos-flow simulation, the results are satisfactory and finally we draw the conclusion that the CFD simulation of the oblique towing test is applicable.

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