Body Shape And Optimazation Of Mini Electric Car Based On FLUENT

In recent years， with advance of energy issues and the human continuallystrengthening of environmental awareness，electric vehicles replacing fuel vehicles hasbecome a trend of the future automotive development. The aerodynamic performance hascrucial influence on the performance of electric vehicles This paper make external flowfield numerical analysis of the car body. Optimize the aerodynamic characteristics of thecar， drag coefficient and lift coefficient is reduced， handling stability is improved andenergy consumption is decreased.1. Use CATIA surface modeling module， establish the car body model and useHyperMesh establishing fluid mesh of CFD.2. Make analysis of external flow field of the whole car and the local by FLUENT.Obtain the velocity vectors，surface pressure contours， and turbulence intensity vectors.The shape of the engine hood is optimized，decreased the drag coefficient of the car.3. Install the tail fin on the top of rear body. Compare the impact of the aerodynamiccharacteristics by tail fins in different shape. Study the interaction and influence betweenresistance， lift and lateral forces under straight-wind and the crosswind conditions.Guarantee the reducing of lift coefficient meanwhile aerodynamic drag coefficient is notrise and reduce the range of eddy current.4. Equip the spoiler to reduce the range and the energy of eddy current andThrough the analysis and optimizing of original model，finally the aerodynamic dragcoefficient is0.32，the lift coefficient is-0.02and lateral forces also been reduced，theaerodynamic performance is improved.