Numerical Simulation Of Planar Motion Mechanism Test Based On CFD Technology

The maneuverability is one of the important performances of ship navigation, which closely related with the safety. Numerical simulation is a significant method of maneuverability prediction. But the accuracy of the prediction largely depends on the hydrodynamic derivatives. Planar motion mechanism test is one of the accurate and reliable methods to get the hydrodynamic derivatives. But it costs a lot of money and time. At the same time it is not convenient to optimize the hull form lines. With the development of computational fluid dynamics, numerical methods are widely used to calculate the hydrodynamic force and moment of hull. Especially it can easily get the details of flow field and repeatedly calculate. So it is particularly suitable for maneuverability optimization.In this dissertation, firstly analyzed the PMM motion, then established hydrodynamic models by plane motion of small amplitude assumptions and Abkowitz’s third-order nonlinear mathematical model of maneuvering motion. Regarding the DTMB5415as my research subject, made three-dimensional geometric solid model, based on two-phase flow theory and the moving mesh technique, coupled motion equations of maneuverability with the RANS equations, used SST k-ω Turbulence model with wall function and VOF method to calculate the resistance. Then used unsteady numerical calculation method to simulate pure sway and pure yaw motion. With analyzing and processing the data, it can get the hydrodynamic derivatives by SR method and MR method. Comparing with the ship model test results, it verified the validity of the numerical methods. This method will provide support for the ship maneuvering numerical simulation and promote the use of numerical methods in practical.