Lagrangian particle tracking
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In experimental fluid mechanics, Lagrangian Particle Tracking refers to the process of determining long 3-Dimensional trajectories of small neutrally buoyant particles (flow tracers) that are freely suspended within a turbulent flow field. These are usually obtained by 3-D Particle Tracking Velocimetry. A collection of such particle trajectories can be used for analyzing the Lagrangian dynamics of the fluid motion, for performing Lagrangian statistics of various flow quantities etc.  
In computational fluid dynamics, the Lagrangian particle tracking (or in short LPT method) is a numerical technique for simulated tracking of particle paths Lagrangian within an Eulerian phase. It is also commonly referred to as Discrete Particle Simulation (DPS). Some simulation cases for which this method is applicable are: sprays, small bubbles, dust particles, and is especially optimal for dilute multiphase flows with large Stokes number. [better source needed]
- Papantoniou D A, Dracos Th (1990). Lagrangian statistics in open channel flow by 3-D particle tracking velocimetry. Elsevier Science Publishing. p. 942. ISBN 9780444600134.}
- Lüthi B; Tsinober A; Kinzelbach W (10 April 2005). "Lagrangian Measurement of Vorticity Dynamics in Turbulent Flow". Journal of Fluid Mechanics. Cambridge University Press. 528: 87–118. doi:10.1017/S0022112004003283.
- Guan Heng Yeoh, Jiyuan Tu (2009). Computational Techniques for Multiphase Flows. Elsevier. p. 643. ISBN 978-0080467337.