Nonlinear diffusion and decay of a blob of turbulence spreading into a quiescent fluid

Proceedings of the National Academy of Sciences, Volume 123, Number 7, February 2026.
ImportanceTurbulence, conventionally generated in the laboratory by the continuous injection of energy into a fluid, is well understood as a large- to small-scale cascade of energy where dissipation occurs. However, predicting how turbulence will propagate and…