Calculation of hydrodynamic characteristics of vehicles based on overlapping grids

DOI:	10.11809/bqzbgcxb2023.01.008
Keywords:	fluid dynamics; multiphase flow; overlapping mesh; resistance calculation; numerical simulation
Abstract:	The source of drag in the crossing boundary process of a vehicle is studied by using overlapping mesh technique and experimental methods. By comparing the experimental results with the simulation results, the variation trend of hydrodynamic force and hydrodynamic coefficients in the process and the reasons for the variation are obtained. The results show that the underwater velocity of the vehicle decreases from 25 m/s to 9.7 m/s, and the hydrodynamic force and coefficients reach the maximum when the vehicle is about to leave water, which are 0.65 kN and 0.184 respectively. The hydrodynamic force and force coefficients fluctuate and gradually tend to be zero in the process of coming out of water, which are mainly affected by water mound phenomenon, change of buoyancy and change of the mass of the attached water. Viscous force is the main source of fluid resistance after the vehicle completely comes out of water. The research provides reference for drag reduction design of underwater vehicles.
Published:	2023-01-28
PDF HTML