February 18, 2026
Research from William Irvine's group was featured on the cover of PNAS this week. Pictured are 3D trajectories of turbulent particles colored by speed, showing two large vortices. Takumi Matsuzawa, Minhui Zhu et al. observed the expansion and decay of a blob of turbulence created in the center of a tank of still water. The results revealed steep fronts separating turbulent and undisturbed regions, the nonlinear transport and decay of the turbulent blob, and a persistent signature of turbulence late into the decay process.
