Optimization Of Aerodynamic Drag Reduction For A Vehicle

The computational fluid dynamics (CFD) in a short period of time to design a better aerodynamic models have played a very important role. But the traditional CFD method can only be analyzed after the completion of the design of CAD geometric digifax products,CFD analysis and optimization engineers proposed case cannot be verified immediately, the design cycle of growth and the cost is high, is not suitable for the current development process of car.In this paper, CFD mesh model of drag reduction optimization of vehicle aerodynamic shape. Based on the grid free deformation algorithm based on Deformation Technology(Mopher) to achieve a number of building and using the vehicle shape design variables;solver calculation of different vehicle models the shape design variables of the aerodynamic resistance value to the commercial CFD software STAR-CCM+ for the combination of different shapes; the design variables and the corresponding aerodynamic resistance value as the experimental design (DOE) of the input and output, DOE analysis; selection of fitting method is appropriate, the design space of fitting a similar model; appropriate selection optimization algorithm to optimize the calculation. The above, in this paper the commercial CFD software STAR-CCM+, multi function optimization software HyperStudy and HyperMesh coupling to construct optimization platform, realization process of the automatic optimization. Its purpose is to make the car To achieve a fast and effective drag reduction optimization, at the same time, it can study the influence of different design variables on the aerodynamic drag of the vehicle, and realize the optimization of the vehicle shape.This paper on the car front and rear design variables of air dynamics, get the results of aerodynamics on vehicle front and rear, respectively, according to the relevant optimization optimization model of vehicle front obtained (aerodynamic resistance minimum)optimization model and the rear (aerodynamic resistance minimum), and were analyzed on CFD they reached the relevantimages, in engineering application to automatic optimization process realizes the automobile aerodynamic drag.