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This article is about a term in aerodynamics. For other uses, see Freestream (disambiguation).
The freestream is the air far upstream of an aerodynamic body, that is, before the body has a chance to deflect, slow down or compress the air. Freestream conditions are usually denoted with a ∞ {\displaystyle \infty } symbol, e.g. V ∞ {\displaystyle V_{\infty }} , meaning the freestream velocity.
- Anderson, John D., 1989. Introduction to Flight, 3rd Ed. McGraw-Hill