At freestream M=2, a shock wave will indeed exist on the upper side of the airfoil, in addition to the shock wave on the bottom. This phenomenon is commonly discussed in missile aerodynamics literature, particularly in relation to wedge-shaped airfoils. The presence of shock waves is a critical aspect of understanding aerodynamic behavior at supersonic speeds. The discussion highlights the importance of studying shock wave formation in various aerodynamic contexts. Understanding these principles is essential for applications in aerospace engineering.
