When a fluid moves with high Reynolds number past a stationary object (a “bluff body”), there is
a tendency for the fluid to form vortices on either side of the object. Each vortex will form, then
detach from the object and continue to move with the flowing gas or liquid, one side at a time
in alternating fashion. This phenomenon is known as vortex shedding, and the pattern of moving
vortices carried downstream of the stationary object is known as a vortex street