Real physics argues that lift is proportional to circulation (the Kutta–Joukowski theorem). But what is circulation? It is the net spinning motion of the fluid around the airfoil. When a wing moves, it sheds a starting vortex opposite in sign to the bound vortex around the wing. This vortex system creates downwash behind the wing. Induced drag is not a "mistake"—it is the price of generating lift in a three-dimensional, real fluid.
Keywords: Aerodynamics, real physics, computational fluid dynamics (CFD), boundary layer, pressure gradient, viscous flow, PDF resources, Doug McLean. understanding aerodynamics arguing from the real physics pdf
Many aerodynamics texts focus heavily on the math—simply plugging numbers into equations to get a result. McLean focuses on the physical logic. Real physics argues that lift is proportional to
Understanding Aerodynamics: Arguing from the Real Physics is a technical, physics-first treatment of aerodynamic principles aimed at advanced undergraduates, graduate students, and practicing engineers. The text emphasizes fundamental physical reasoning over purely mathematical formalisms, linking intuition with quantitative analysis. The PDF edition preserves figures and worked examples that illustrate real-world aerodynamic phenomena. When a wing moves, it sheds a starting