Research On Resistance Performance Of Amphibious Vehicle Based On CFD

For amphibious vehicles,almost every vehicle has its own unique shape,resulting in its resistance performance research is slow.The research results of resistance performance in the field of ship are abundant,but these empirical formulas will produce large errors when applied to the field of amphibious vehicle.With the increasing maturity of CFD software and the rapid development of computer performance,it opens up a new direction for the research of resistance performance of amphibious vehicle.The numerical simulation research on the resistance performance of amphibious vehicle is helpful to the design and development of high performance amphibious vehicle and the research and application of drag reduction technology,which has important practical significance and application value.Based on the needs of scientific research projects,the main research objectives of this paper are: to estimate the resistance of the new energy amphibious vehicle under construction,and to design a feasible drag reduction scheme to improve the endurance of the vehicle.After consulting relevant research methods and results on resistance performance of amphibious vehicles,the following work was carried out centering on the research objectives:Firstly,the force on water of amphibious vehicle is systematically analyzed,and the navigation state is classified according to the ship principle,and the resistance composition and research methods are summarized.The CFD calculation model and calculation method are studied,and the model and method suitable for amphibious vehicle are selected.Then,Fluent software is used to simulate the resistance of the original vehicle.The whole calculation process is established from grid division,solution calculation and post-processing,and the uncertainty of the number of grids is analyzed.The hydrodynamic characteristics of the original vehicle at different speeds are analyzed,and the air resistance and accessory resistance are analyzed and calculated.Finally,according to the simulation results,three drag reduction schemes were designed,and the drag reduction effect was simulated.Compared with the original vehicle model,the optimized model improved the drag performance significantly,and the drag reduction effect at 6km/h and 12km/h speed was 52.99% and 38.47%,respectively.