CFD Simulation Study on the Self-propelled Performance of Amphibious Vehicle Powered by Water-jet Propulsion Pump
Aiming at the dynamic coupling simulation between amphibious vehicles and pump thrusters,an efficient simulation method of fluid-structure interaction combined with non-inertial frame is established.Two simulation approaches for obtaining the matching speed of the pump thruster,the self-propelled attitude of the vehicle and its hydrodynamic performance at some specified sailing peed are proposed.The Simcenter STAR-CCM+software package is used to numerically obtain the hydrostatic resistance,attitude and pump thruster matching speed of the amphibious vehicle at different specified speeds under self-propelled conditions,and the accuracy of the numerical method was verified by comparison with experimental data.Meanwhile,to reduce the hydrodynamic resistance of amphibious vehicles as well as the speed of the pump,a drag reduction scheme which employs a baffle at the bottom of the front wheel of the prototype amphibious vehicle is proposed,and the influence of the baffle on the drag reduction of the vehicle and the matching speed of the propulsion pump is also analyzed numerically.
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