3.0 Wind Tunnel Testing Methods

3.1 Simulation of the Natural Wind at Small Scale

In view of the way the mean velocity profile and turbulence characteristics of the wind affect wind loads, it is important that flow in the wind tunnel replicates these factors at model scale. The methods for doing this are well established and typically involve a combination of special flow devices, such as spires at the start of the working section, followed by a length of roughness on the wind tunnel floor, representing the terrain roughness over which the wind flows at full scale. These methods are described in the detailed standards and manuals of practice on wind tunnel testing referenced in the Introduction. Figures 3.13.3 show examples of typical test set-ups ...

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