How does Lagrangian particle tracking work in fluid dynamics?

Lagrangian particle tracking is a method used in fluid mechanics to analyze motion by tracking individual fluid parcels or discrete particles over time. In computational fluid dynamics, this often involves treating the fluid phase in an Eulerian framework while resolving the particle phase using Lagrangian mechanics. It is widely applied in dilute multiphase flows, environmental transport, and industrial mixing simulations.

What we know

• The Lagrangian specification of flow follows an individual fluid parcel through space and time, producing pathlines. [3]
• In computational fluid dynamics, Lagrangian particle tracking simulates discrete particles embedded in a continuous flow field. [4]
• Dilute multiphase flows like aerosols use an approach where the continuous fluid phase is solved in an Eulerian framework and particles are resolved using Lagrangian mechanics. [4]
• Applications of Lagrangian particle tracking range from particle deposition in human airways to environmental pollutant dispersion. [4]

Where to go next

• compared withWhat is the difference between Eulerian and Lagrangian flow specifications?
• how it workedHow does smoothed-particle hydrodynamics simulate continuum media?
• the bigger pictureWhat is computational fluid dynamics used for in engineering?
• how we knowHow is three-dimensional particle tracking velocimetry used experimentally?
• a case in pointHow are atmospheric pollutants tracked using dispersion models?
• an unexpected connectionHow did an astrophysical method become a tool for fluid mechanics?Smoothed-particle hydrodynamics was originally developed in 1977 for solving astrophysical problems before becoming widely used for fluid flows and solid mechanics.

Sources

• [1]computational fluid dynamics (Wikidata Q815820) · CC0 1.0
• [2]Computational fluid dynamics · CC BY-SA 4.0
• [3]Lagrangian and Eulerian specification of the flow field · CC BY-SA 4.0
• [4]Lagrangian particle tracking · CC BY-SA 4.0
• [5]Smoothed-particle hydrodynamics · CC BY-SA 4.0