Papers by Author: Hai Tao Bao

Abstract: The aerodynamic characteristics of ordinary vehicle have been studied by lots of scholars, while few people pay enough attention to the aerodynamic characteristics in the bottom of the car. As the requirements of regulations for the performance of the car continues to increase, Analysis of Aerodynamic Characteristics of the car is much more necessary now. In this paper , by using CFD method and getting benefit from the established CFD software, we gave external velocity field and pressure field of the car. The data was analyzed and summarized and the computational results are obtained. In the final analysis for the flatness in the bottom of the car influence on aerodynamic characteristics.This paper has done some useful attempts, and it will provide specific reference significance to the numerical simulation on design of the car in the future.

Abstract: The aerodynamic problem is associated with the shape of the forebody and afterbody of a 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. 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 car, it is of certain guiding significance for practical application.

Abstract: Computational Fluid Dynamics (CFD) is used for the investigation of the aerodynamic characteristics of the truck. The gap between the truck and the container of the heavy truck on its aerodynamic characteristics were simulated by using equations and dynamic mesh method. 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 discretion of time is carried out by a full-implicit time integral scheme. Analysis of the simulated flow fields and the change pattern of the aerodynamic drag under different gap length demonstrate that when the gap length change and the aerodynamic characteristics change. This paper provides a theoretical reference for the development of truck products determining the gap distance between the truck and the container.

Abstract: The automobile resistance reduction problem is the major topic in the automotive industry because of its link with economy and safe. Taking Computational Fluid Dynamics software as the platform, the automobile as the research object, the simulation models are established based on unsteady, viscous Reynolds averaged k-ε equations, by using dynamic grid and finite volume method. The aerodynamic characteristics of the automobile were studied with the different rear windscreen angles, such as 30°,35°,40°and 45°respectively. Analysis of trailing vortex automobiles for resistance. 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 conclusions of analysis provide the theoretical foundation for styling optimization of automobile，it is of certain guiding significance for practical application.