Lagrangian Properties of Particles in Turbulence

The Lagrangian description of turbulence is characterized by a unique con- ceptual simplicity and by an immediate connection with the physics of dis- persion and mixing. In this article, we report some motivations behind the Lagrangian description of turbulence and focus on the statistical properties of particles when advected by fully developed turbulent flows. By means of a detailed comparison between experimental and numerical results, we review the physics of particle acceleration, Lagrangian velocity structure functions, and pairs and shapes evolution. Recent results for nonideal particles are dis- cussed, providing an outlook on future directions.