Simulation Of The Crane's Hydrodynamic Coefficients Based On CFD

With the continuing requirements of the marine, the people have made ever-increasing demands on the performance of the marine crane: the crane's lifting capacity, the ability to fight against storms, cruising speed etc. These performance indicators are concerned with the hydrodynamic performance.Firstly, according to the basic theory of fluid dynamics, this thesis analyzed some details of the calculation principle for commercial software Fluent. It contains the division of the grid for the flow field, the settings of the boundary conditions, the choices of the turbulence model. Then we have simulated rectangular profile using K -εmodel,including rectangular profile in unbounded flow field and flow with free surface wave field in different motion. Compared with the linear potential flow solution, the computational results are very close to that of the linear potential flow results for low amplitude, low frequency excitation. Thirdly, the three-dimensional model of the crane ship and a three-dimensional numerical pool were established. Using the dynamic grid, we have calculated hydrodynamic coefficients of the crane model under different excitation frequency. Compared with the results of SMF, these two results are very closed to each other, this verify the usefulness of this method. Finally, we made a crane ship hydrostatic test, inherent the added mass and damping under natural frequency, compared with the interpolation results. The experimental result has verified the results of this method.The research results show that: the numerical simulation of a crane ship proved the practical applicability of this method. But for the overall crane ship system, there is still a long way to go.