In fluid dynamics, Blasius theorem states that [1][2][3] the force experienced by a two-dimensional fixed body in a steady irrotational flow is given by and the moment about the origin experienced by the body is given by Here, The first formula is sometimes called Blasius–Chaplygin formula.
[4] The theorem is named after Paul Richard Heinrich Blasius, who derived it in 1911.
[5] The Kutta–Joukowski theorem directly follows from this theorem.