Customer Login Shopping Cart
Library Subscription: Guest
Home Archives Officers Future meetings American Society of Thermal and Fluids Engineering

ISSN Online: 2379-1748

7th Thermal and Fluids Engineering Conference (TFEC)
SJR: 0.152 SNIP: 0.14 CiteScore™:: 0.5

Indexed in

May, 15-18, 2022 , Las Vegas, NV, USA

Numerical study of yaw angle and Reynolds number effects on the aerodynamic characteristics of a road vehicle

Get access pages 983-990
DOI: 10.1615/TFEC2022.fnd.040939


Unsteady three-dimensional computational fluid dynamics simulations are conducted to investigate the effects of wind direction on the wake characteristics and aerodynamic forces of a square-back Ahmed body. Turbulence is modeled using the Unsteady Elliptic Blending Reynolds Stress Model. A range of yaw angles (0° < β ≤ 35°) and Reynolds numbers based on body length and approach velocity (54,000 < Re ≤ 1,000,000) are studied. Results are based on analysis of the mean flow. At β = 0°, the rear wake behind the vehicle is symmetric in the horizontal plane and a small separation region is observed at the front end of the vehicle along both sides. For non-zero yaw angles, the rear wake region decreases in size and is nonsymmetric about the vehicle central plane. The separation region on the windward side of the body diminishes as β increases and disappears when the yaw angle reaches 15°. A wake region forms on the leeward side of the body, expanding as the yaw angle increases. Examination of force coefficients shows that the drag coefficient increases for β ≤ 20°, but decreases at higher angles. However, the side force coefficient increases linearly with increasing yaw angles up to β = 35°. The Reynolds number has little affect on the overall flow structure at the yaw angles in this study.
Home Archives Officers Future meetings American Society of Thermal and Fluids Engineering English Русский 中文 Português Help Contact Us Back to ASTFE