The aerodynamic problem is associated with the shape of the forebody and afterbody of a passenger car. The finite volume method is used to discrete the governing equations, the second-order up wind difference scheme is adopted for the convection term and the centric difference scheme for the dissipation term. The comparison of pressures nephogram and velocity nephogram are presented among nine rear windscreen angles of the symmetry. Analyzing the result, The results show that the different angle of the rear window, the flow separation and re-attachment points for the different; the resistance coefficient is also different. The simulation results are similar with the test ones. It is proved that the numerical simulation air flow of passenger car is feasible. The conclusions of analysis provide the theoretical foundation for styling optimization of passenger car, it is of certain guiding significance for practical application.
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