Didier Dragna is assistant professor in the Department of Fluid Mechanics, Acoustics and Energetics at École Centre de Lyon. Alumnus from École Centrale de Lyon, he hold a PhD in Acoustics. He joined the Fluid Mechanics and Acoustics Laboratory (LMFA) in 2012. His research focuses in acoustic propagation in inhomogeneous media. He is specially interested in long range sound propagation in the atmosphere and sound propagation in lined ducts with flow.