In the project, a wide range of turbulent flows can be generated in the lab from periodic flows to chaotic flows using two different methods. One is the electromagnetically driven turbulence (EMT), by which both regular and turbulent flows can be made. The other is the Faraday wave turbulence, by which forcing scales and forcing levels can be controlled. Coherent vortices generation by waves will be investigated. Lagrangian statistics of the flow under different experimental conditions will be used to characterise the transport properties of the flow.
The project outline is as follows:
- Generation of 2D turbulence in the laboratory
- Generation of coherent vortices using waves
- Characterisation of surface flows and particle trajectories
- Effects of coherent vortices on particle dispersion
- Characterisation of transport barriers.
Main experimental techniques required for the project is particle image velocimetry for the Eulerian velocity field measurement and the particle tracking velocimetry to track particle trajectories for the Lagranigan statistics. Numerical analysis methods include spectral analysis, Lagrangian statistics such as single and pair particle dispersion , finite-time Lyapunov exponent, braids and others.
The project proposed a novel method of particle dispersion and transport barrier analysis. The analysis technique will be applied to several laboratory experiments in a broad range of experimental conditions.Laboratory studies of how different kinds of particles (dye, tracer particles or inertial particles) disperse in particular flows is of great value and will lead to better models of the mixing in natural environments.