Interpreting coherence in wall turbulence
Fazle Hussain
Nature Reviews Physics, Published online: 21 April 2026; doi:10.1038/s42254-026-00929-6 Although no universally accepted definition exists, coherent structures are key organized features of wall-bounded turbulent flows. This Review clarifies competing CS interpretations and highlights challenges in establishing causal relationships among CSs and in their interpretation via machine learning.