👉 The paper fluid, also known as the Prandtl-Meyer function or the stream function in a compressible flow context, is a mathematical concept used to describe the change in direction of a fluid flow when it encounters a convex corner or expansion in a pipe or duct. It quantifies how the flow velocity and angle change as the fluid transitions from one area of high pressure to another, effectively accounting for the effects of viscosity and compressibility in fluid dynamics. This function is crucial in understanding and predicting the behavior of gases and liquids in various engineering applications, such as aerodynamics, turbomachinery, and fluid transport systems.
