2. Wind effects

2.1 Definitions

• Wind direction

  The overall mean wind direction is assumed to be horizontal.

• Surface exposure

  Assuming we replace the air stream with a bundle of light rays in the same direction, illuminated surfaces are said to be "upwind" and unilluminated surfaces are said to be "downwind".

• Master-couple

  In the same spirit of substituting a light ray for the wind, the shadow cast on a plane perpendicular to the direction of the rays (or wind) is called the master couple of the construction.

• Action exerted by...