Hydrodynamic Analysis And Motion Optimization Of Deep Sea Motorized Float

The deep sea motorized float is mainly used for long-term and multi-disciplinary observation in deep ocean,making the change of deep ocean become "transparent".Combined with the characteristics of glider and traditional float,this motorized float can switch between two models with wings,and can realize the function of maneuver observation based on the function of fixed observation.In this study,the hydrodynamic analysis of the deep sea motorized float is mainly carried out from three aspects: the movement of the underwater float,the movement of the float near the water surface and the influence of energy compensation device for motion optimization.In the research of the underwater motion of the float,the influence of speed,angle of attack,angle of drift and wings shape and position to the hydrodynamic performance of the float is mainly considered,using SOLIDWORKS for modeling the structure,meshing in ICEM and numerical simulating in FLUENT,the control equation is NS equation and Reynolds averaged continuity equation,the turbulence model is standard k-? model,which has good numerical stability and accuracy of solving pressure gradient,and it is the most widely used model in solving the ship viscous flow and viscous hydrodynamic problem.In the mesh generation,the unstructured mesh and the structured mesh are adopted,and the O mesh is adopted in the outer domain,and the unstructured mesh is used in the inner domain.In the second part,the motion characteristics of rolling and heaving are calculated by using spectral analysis method,and a series of parameters are calculated in MATLAB after the motion equation is given,and then use the parameters into response analysis.In the last part,the motion equation of the float with extra energy compensation device is built,and compared with the equation of the float without the device,and the results are that with the accumulator,the adjustment range of buoyancy of the float can be expanded,with a faster dive to the specified depth,and an increment of energy efficiency.