Transient aerodynamics

When driving on roads every vehicle is influenced by other road users as well as natural wind. Examples are driving behind other vehicles or the changing air-flow conditions in passing/overtaking maneuvers. In these driving situations the air-flow velocity and the approach angle are variable in terms of time. Because of this an increase of wind noises occure and the vehicle's straight-running stability can be affacted. These air-flow situations reduce driving comfort and may even constitute safety-relevant situations for the driver.  


Gusty crosswinds in particular generate forces and moments at the vehicle which normally cannot be modeled by stationary air-flow conditions in a wind tunnel. Likewise the resulting transient (non-stationary) vehicle reactions cannot typically be recorded with today's measurement methods in vehicle wind tunnels. 


At FKFS are already cutting-edge options for simulating transient air-flow conditions available. Appropriate flow excitation systems and the accompanying measurement procedures have been developed for this purpose. Today we can already offer our customers a test environment for generating transient air-flow conditions and for recording the associated transient forces and pressures at the vehicle. The resulting vehicle reaction under transient air-flow conditions can be measured, evaluated and optimized in the model wind tunnel. 

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