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| Numerical Simulation of Planar Motion Mechanism Test and Hydrodynamic Derivatives of a Ship in Laterally Restricted Water
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| LIU Hana,MA Ninga,b,SHAO Chuanga,GU Xiechonga,b |
| (a. School of Naval Architecture, Ocean and Civil Engineering； b. State Key Laboratory of
Ocean Engineering, Shanghai Jiaotong University, Shanghai 200240, China) |
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Abstract Abstract： To investigate the hydrodynamic characteristics of a large ship in laterally restricted water, this paper simulated the PMM test based on the computational fluid dynamics(CFD) technique. In order to realize the dynamic simulation of the planar motion mechanism(PMM) test limited by water width, a hybrid dynamic mesh technique was proposed. The proposed method was validated by comparing the numerical results with results of the PMM test in a circulating water channel. The PMM tests for different widths were simulated to analyze the relationship between hydrodynamic forces and motional velocities. The results show that the nonlinear feature of hydrodynamic forces becomes more remarkable in laterally restricted waters. The acceleration derivatives increase whereas the damping derivatives decrease, and a slight increment appears in the absolute values of rotational derivatives. The second order derivatives change drastically.
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Received: 15 June 2015
Published: 29 January 2016
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