CFD analysis on effect of front windshield angle on aerodynamic drag

2017 2nd International Seminar on Advances in Materials Science and Engineering

Abdellah, Essaghouri^1 ; Wang, Bo^1

State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Beijing, China^1

关键词: Aerodynamic analysis;    Calculation process;    External aerodynamics;    High quality surface;    K-epsilon turbulence model;    Recent researches;    Reynolds average Navier-Stokes;    Workbench software;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/231/1/012173/pdf
DOI  :  10.1088/1757-899X/231/1/012173

来源: IOP

【 摘 要 】

The external aerodynamics plays an important role in the design process of any automotive. The whole performance of the vehicle can be improved with the help of external aerodynamics. The aerodynamic analysis nowadays is implemented in the recent research in the automotive industry to achieve better cars in terms of design and efficiency. The major objective of the present work is to find out the effect of changing the angle between the engine hood and the front windshield on reducing the car air resistance. A full scale three dimensional (BMW 3 series) sedan car model was carried out using the ALIAS AUTOSTUDIO 2016 a NURBS modeling tool with high quality surfaces, only the external shape of the car was modeled while the interior was not modeled. The ANSYS 17.0 WORKBENCH software package was used to analyse the airflow around the external shape of the car - the solutions of Reynolds Average Navier Stokes (RANS) equations has been carried out using realizable k-epsilon turbulence model (which is perfectly suitable for the automated calculation process) for the given car domain. In this work, the boundary layer, mesh quality, and turbulent value simulation has been compared and discussed in the result section. Finally the optimal model was selected and the redesigned car was analysed to verify the results.