Abstract
Planar motion mechanism (PMM) tests provide a means of obtaining the hydrodynamic derivatives needed to assess ship maneuverability properties. In this paper, the self-developed computational fluid dynamic (CFD) solver based on the open source code platform OpenFOAM, naoe-FOAM-SJTU, associated with the overset grid method is used to simulate the complex viscous flow field of PMM tests for a benchmark model Yupeng Ship. This paper discusses the effect of several parameters such as the drift angle and period on the hydrodynamic performance of the ship and compares the time histories of the predicted forces and moments with experimental data. To investigate the complex viscous flows with a large separation, four vortex identification methods are used to capture the vortex structures. The results show that the forces and moments are in good agreement in static drift and dynamic tests. By comparing the vortex structures, it is found that the third generation vortex identification methods, OmegaR and Liutex, are able to more accurately capture the vortex structures. The paper concludes that the present numerical scheme is reliable and the third generation vortex identification methods are more suitable for displaying the vortex structures in a complex viscous flow field.
Highlights
The accurate assessment of ship maneuverability in the design stage is essential for the safe navigation and efficient operation of ships
Unsteady Reynolds averaged Navier–Stokes (RANS) equations combined with an stress transport (SST) k-ω turbulence model are adopted to solve the complex viscous flow and a dynamic overset grid method is applied to simulate the large amplitude motion of the hull
The paper compares the time histories of predicted and experimental forces and moments acting on the hull, and uses four vortex identification methods to capture the vortex structures in the large separated flow, which are very helpful for a further analysis on the flow mechanism around the hull
Summary
The accurate assessment of ship maneuverability in the design stage is essential for the safe navigation and efficient operation of ships. Xing et al [5] used the solver, CFD Ship-Iowa, to carry out numerical simulations of oblique towing tests of a KVLCC2 tanker at different drift angles (0◦, 12◦, 30◦). Wang et al [8] simulated the flow field of ship hull at six drift angles by the CFD solver, naoe-FOAM-SJTU. The effect of speed and water depth on the hydrodynamic performance of the hull in the pure sway test was investigated by Liu et al [19] In their studies, the CFD solver, naoe-FOAM-SJTU, was used to solve unsteady RANS equations by coupling it with the shear stress transport (SST) k-ω turbulence model. Reliable numerical schemes are presented, and four vortex identification methods are applied to analyze the separation flow in the PMM tests of a Yupeng ship.
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