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The
freestream is the air far upstream of an
aerodynamicAerodynamics is a branch of dynamics concerned with studying the motion of air, particularly when it interacts with a moving object. Aerodynamics is a subfield of fluid dynamics and gas dynamics, with much theory shared between them. Aerodynamics is often used synonymously with gas dynamics, with...
body, that is, before the body has a chance to deflect, slow down or compress the air. Freestream conditions are usually denoted with a
symbol, e.g.
, meaning the freestream velocity