Nicolas Mordant, Laboratoire de Physique Statistique, Ecole Normale Supérieure
Most measurements in turbulent flows are of Eulerian nature and often consist in measuring quantities (like the velocity field) in space at a given time. Lagrangian measurements deal with fluid particles trajectories: quantities are measured along the path of one single particle. This approach may seem more natural for some issues like emission and dispersion of a passive scalar but it is rather difficult to implement in experiments as particles have to be tracked with both a high spatial and temporal resolution. Only few Lagrangian experiments have been reported so far and some of them will be presented in this lecture.
Presentation in PDF: 2.3 MB.