Decay of Turbulence: Understanding Dissipation and Energy Cascades

This lecture delves into the decay of turbulence, exploring the dissipation of energy and the formation of energy cascades. The instructor discusses the different scales at which turbulence dissipates, the reasons behind the power-law behavior observed, and the factors influencing the decay rate. Various concepts such as the Richardson cascade and the role of large scales in controlling decay are covered. The lecture also touches upon the challenges in understanding the exponent selection in the decay process and the implications for turbulence modeling.