Moving-Particle Semi-Implicit Method for Vortex Patterns and Roll Damping of 2D Ship Sections |
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| Authors: | PAN Xu-jie ZHANG Huai-xin LU Yun-tao |
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| Institution: | School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong Unizersity, Shanghai 200030, China |
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| Abstract: | A meshless method, Moving-Particle Semi-Implicit Method (MPS) is presented in this paper to simulate the rolling of different 2D ship sections. Sections S.S.0.5, S.S.5.0 and S.S.7.0 of series 60 with CB=0.6 are chosen for the simulation. It shows that the result of MPS is very close to results of experiments or mesh-numerical simulations. In the simulation of MPS, vortices are found periodically in bilges of ship sections. In section S.S.5.0 and section S.S.7.0, which are close to the middle ship, two little vortices are found at different bilges of the section, in section S.S.0.5, which is close to the bow, only one big vortex is found at the bottom of the section, these vortices patterns are consistent with the theory of Ikeda. The distribution of shear stress and pressure on the rolling hull of ship section is calculated. When vortices are in bilges of the section, the sign change of pressure can be found, but in section S.S.0.5, there is no sign change of pressure because only one vortex in the bottom of the section. With shear stress distribution, it can be found the shear stress in bilges is bigger than that at other part of the ship section. As the free surface is considered, the shear stress of both sides near the free surface is close to zero and even sign changed. |
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| Keywords: | roll damping unsteady viscous flow Moving-Particle Semi-Implicit Method (MPS) |
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