The Effect of a Sheared Crosswind Flow on Car Aerodynamics

Features
Event
WCX™ 17: SAE World Congress Experience
Authors Abstract
Content
In the wind tunnel the effect of a wind input on the aerodynamic characteristics of any road vehicle is simulated by yawing the vehicle. This represents a wind input where the wind velocity is constant with height above the ground. In reality the natural wind is a boundary layer flow and is sheared so that the wind velocity will vary with height. A CFD simulation has been conducted to compare the aerodynamic characteristics of a DrivAer model, in fastback and squareback form, subject to a crosswind flow, with and without shear. The yaw simulation has been carried out at a yaw angle of 10° and with one shear flow exponent. It is shown that the car experiences almost identical forces and moments in the two cases when the mass flow in the crosswind over the height of the car is similar. Load distributions are presented for the two cases. The implications for wind averaged drag are discussed.
Meta TagsDetails
DOI
https://doi.org/10.4271/2017-01-1536
Pages
8
Citation
Howell, J., Forbes, D., Passmore, M., and Page, G., "The Effect of a Sheared Crosswind Flow on Car Aerodynamics," Passenger Cars - Mechanical Systems 10(1):278-285, 2017, https://doi.org/10.4271/2017-01-1536.
Additional Details
Publisher
Published
Mar 28, 2017
Product Code
2017-01-1536
Content Type
Journal Article
Language
English