Wind-tunnel interference effects

Simulation of interference effects in CFD

In aerodynamic vehicle development it has to be considered that – as a result of wind-tunnel-specific interference effects – the flow situation on the road cannot be completely realistically replicated in any wind tunnel.  In comparison of wind-tunnel and road measurements certain variations apear. The interference effects which are responsible for this can be put down to different boundary conditions in the wind tunnel which are influenced, among others, by the shape of the wind-tunnel measuring system. Typically, excessively high forces are measured in closed-loop measuring systems and excessively low forces are measured in open-loop measuring systems.


Interference effects in open-loop measuring systems

For wind tunnels with closed-loop measuring systems there have already been validated correction methods for the interference effects. These methods are used as standard in many wind tunnels. In comparison it is much more difficult to use correction methods efficiently for wind tunnels with open-loop measuring systems. The work at FKFS in wind-tunnel research sets high emphasis on developing user-friendly wind-tunnel correction methods for open-loop measuring systems.


At the request of our customers we use the the established Mercker/Wiedemann method for measurements in the aeroacoustic vehicle wind tunnel and in the model wind tunnel to correct the described wind-tunnel interference effects.

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