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The flow structures about a car-like bluff body with a variety of after-body configurations are numerically studied based on a finite-volume solution method with the sub-grid scale turbulence model. The numerical calculations are compared with the experiments in both the water basin and wind tunnel. Different detachment features are demonstrated in the case of different after-body configuration by the numerical analysis and the computer-graphics visualization. Some critical features such as high and low drag states are revealed in the numerical simulation in the case of critical-angle configuration and their mechanism are discussed.