Design Of A Car Body Styling And Reserch On Aerodynamic Simulation

With the path condition improvement and oil shock's aggravating, people have more desires to know the details abort exterior flow filed around a car in order to enhance automobile's power and the fuel oil efficiency; Searching how the automobile body shape influence the flow of gas condition; In oder to designs the automobile body contour's aerodynamics performance carries on the appraisal, and proposes its improvement and the optimal direction theoretically.According to the three-view model data, the thesis uses CATIA to establish its body of the flow analysis model, and evaluates model's light compliance and guaranteeing model suitable. By pre calculating, affecting Automotive External Field Performance of the four key factors and their reasonable value areas are obtained; Based on this four key factors in orthogonal test are typical of nine parameter model; then using the knowledge of CATIA engineering properties of construction parameters of the vehicle body model, using the parametric model can be quickly generated series of typical parameters of the geometric model of the body.Using standard k-εmodel to simulate the body drain field; given aerodynamic drag and aerodynamic lift access methods; by GAMBIT typical parameters of each model was mesh and pre-processing work, and then use FLUENT to analysis Flow Field on the body of CFD model, and using the aerodynamical resistance coefficient and dynamic lift coefficient as the evaluating indicator, to the series parametrization flow field anatomic model's resistance size which establishes carries on the evaluation, which has given automobile body's several key parameter reference value scopes. in accordance with the principle of preference extracted from the contrast model as the optimum model of two models; obtained by the optimum model optimization model for further analysis. Optimization model of the flow field analysis verified with better overall performance; In addition, the paper analyzes the optimal model of the aerodynamics of other factors, that is, different ground clearance on the car lift and drag effects, the results show that the ground clearance can significantly influence the vehicle body of the lift coefficient; on the vehicle drag coefficient to a certain extent car with pneumatic lift first from the decrease of ground clearance, but little ground clearance to a certain extent, it will increase aerodynamic lift.Through the series of comparative studies of Flow analysis model, this body shape for a model to optimize the design parameters provided with the guidance of research methods. The research methods for the flow of automobile body have universal generalization.