Submarine Topography And Pipeline For AUV Hydronamic Performance Interference Analysis

With the development of marine resources keep the pace to the deep forward,autonomous underwater vehicle(AUV)play an increasingly important role in the development of marine resources.When the AUV is equipped with different equipment,AUV is mainly responsible for the marine environmental data collection,marine resource exploration,marine equipment detection and other tasks in the development of marine resources.When the AUV is executing the detection task,such as measuring the surface features of the seabed,scanning the topography of the seabed,automatic tracking the seabed oil and gas pipeline,the AUV need to voyage nearly the submarine because of the equipment performance limits.In order to ensure the AUV safely and efficiently complete the detection task,analysis of the effect of submarine topography and submarine pipeline on AUV's hydrodynamic performance has very important significance.In this paper,numerical simulation of AUV motion near the seabed base on the CFD technology,analysis of the AUV's flow disturbing characteristics interference by submarine topography and submarine pipeline.The paper expand research work from the following three aspects:First,numerical simulation of partially constrained model test of the SUBOFF model,obtained the main maneuverability hydrodynamic coefficients.The results are compared with the experimental values,and the error satisfies the requirements of engineering practice;Then the numerically forecasts main maneuverability hydrodynamic coefficients of the AUV using the same methodSecond,numerically simulate AUV towing test In different near bottom distance.analyze the influence on the flat sea floor AUV drag,lift,moment properties;Then numerically simulate AUV pure heave motion,pure yaw motion In different near bottom distance and forecast partly hydrodynamic coefficient changes with spacing of H;Last,Considering the actual seabed topography complexity,numerically simulate the AUV motion over complex terrain for several typical seafloor topography Basing on morphing technology,forecast the trends of AUV suffered vertical force and pitching moment with the undulating terrain.Third,numerical simulation of the AUV is executing pipeline tracking task based on the optical visual,analyzing its hydrodynamic performance interference by the submarine pipeline or coupled interference by a submarine pipeline and seabed.Firstly discussed the hydrodynamic performance of the AUV influence by pipe diameter;Then forecasted some hydrodynamic coefficients changes with distance of H for the actual pipeline distribution;Finally,simulation of the AUV motion in both the distribution pipeline junction area,forecasted its hydrodynamic performance influence by the impact of junction.