Blasius–Chaplygin formula

The Blasius–Chaplygin formula, deviced by Sergey Chaplygin from the work of Heinrich Blasius relates the force $\bar{L}$ given by a complex velocity field $f$

${\displaystyle {\bar {L}}={\frac {ip}{2}}\int _{\gamma }f^{2}(z)\,\mathrm {d} z}$

The equation stated above appears from the analysis of the velocity over a body with a boundary $\gamma$, taking Bernoulli's law into consideration.^[1]

References

1. Eremenko, Alexandre. "Why airplanes fly, and ships sail" (PDF). Purdue University.