Application of CAD/CAE class systems to aerodynamic analysis of electric race cars

Modern Technologies in Industrial Engineering 2015

Grabowski, L.^1 ; Baier, A.^1 ; Buchacz, A.^1 ; Majzner, M.^1 ; Sobek, M.^1

Silesian University of Technology, Faculty of Mechanical Engineering, Institute of Engineering Processes Automation and Integrated Manufacturing Systems, Gliwice, Poland^1

关键词: Aerodynamic analysis;    Aerodynamic drag force;    Aerodynamic effect;    Air velocities;    Computer analysis;    Freeform modelling;    Low energy consumption;    Surface modeling;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/95/1/012044/pdf
DOI  :  10.1088/1757-899X/95/1/012044

来源: IOP

【 摘 要 】

Aerodynamics is one of the most important factors which influence on every aspect of a design of a car and car driving parameters. The biggest influence aerodynamics has on design of a shape of a race car body, especially when the main objective of the race is the longest distance driven in period of time, which can not be achieved without low energy consumption and low drag of a car. Designing shape of the vehicle body that must generate the lowest possible drag force, without compromising the other parameters of the drive. In the article entitled Application of CAD/CAE class systems to aerodynamic analysis of electric race cars" are being presented problems solved by computer analysis of cars aerodynamics and free form modelling. Analysis have been subjected to existing race car of a Silesian Greenpower Race Team. On a basis of results of analysis of existence of Kammback aerodynamic effect innovative car body were modeled. Afterwards aerodynamic analysis were performed to verify existence of aerodynamic effect for innovative shape and to recognize aerodynamics parameters of the shape. Analysis results in the values of coefficients and aerodynamic drag forces. The resulting drag forces Fx, drag coefficients Cx(Cd) and aerodynamic factors Cx∗A allowed to compare all of the shapes to each other. Pressure distribution, air velocities and streams courses were useful in determining aerodynamic features of analyzed shape. For aerodynamic tests was used Ansys Fluent CFD software. In a paper the ways of surface modeling with usage of Realize Shape module and classic surface modeling were presented. For shapes modeling Siemens NX 9.0 software was used. Obtained results were used to estimation of existing shapes and to make appropriate conclusions..