Lagrangian chaos and the enstrophy cascade in Ekman-Navier-Stokes two-dimensional turbulence
This paper investigates how linear Ekman friction alters the enstrophy cascade in two-dimensional turbulence by demonstrating that, under high friction, vorticity becomes passively transported, allowing a phenomenological model based on Gaussian-distributed Lagrangian Finite Time Lyapunov Exponents to accurately predict the resulting spectral slope corrections.