Freestream

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. 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.