LPTCTF · Lagrangian particle tracking in controlled turbulent flows
FP6 — Marie Curie Actions (Human Resources and Mobility)
- Duration
- 2007-03-01 → 2009-02-28
- EU contribution
- €80,000
- Participants
- 1
- Scheme
- IRG
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Results in brief
Final Activity Report Summary - LPTCTF (Lagrangian particle tracking in controlled turbulent flows)
During the project period we have developed an experimental facility specifically aimed at increasing our understanding of the structure of turbulence and the motions of particles in turbulent flows. Turbulence is generated in a water-tank facility, and motions of particles in the fluid are tracked with a high speed digital camera. The flows studied in the experimental facility are nearly isotropic turbulence, homogeneous strained turbulence, and nearly isotropic turbulence with an added mean temperature profile for studying effects of convection on particle motions. Together with our collaborators, we have developed particle tracking algorithm capable of tracking hundreds of particle in three dimensions. The experiments will allow us to determine single- and multi-particle trajectories of passive tracers and inertial particles in simple and well understood turbulent flows. The motions will be correlated with the large scale anisotropy in the flow with the aim of reflecting on scale interaction. This approach is particularly useful in terms of understanding the small scale statistics, where universality is assumed, but not always obeyed. To maximize the applicability of the results, the facilities that have been developed during the project period allow for a range of flow parameters, and type of flows. The focus is on the geometric evolution of the small scale structures of the flow, both from the Eulerian and the Lagrangian viewpoint.
Data: CORDIS, © European Union
Project objective
Lagrangian measurements of single-particle and multi-particle statistics are investigated in a medium-to-high Reynolds number, multi-function water-tunnel facility. A state-of-the-art three dimensional digital particle-tracking system, designed to achieve sub-Kolmogorov length and time scale resolution, is proposed. The detection system is further designed to resolve a large range of scales present in the flow field.The flow facility will allow for investigations in decaying grid turbulence, strain/expansion regions, external flows, and transitional flows, and allow for a range of parameters, such as in Reynolds number, strain rates and Stokes number. The detection system is moved with the mean flow velocity in order to follow the motions of tracer particles and inertial particles, and is capable of simultaneously tracking up to 500 particles.The proposed experimental facility is designed for long-term research in fluid dynamics and turbulence research at Reykjavik University. The focus is on dispersion and the geometrical evolution of identifiable flow structures in well conditioned flows as well as the persistent small-scale anisotropy present in turbulence. By controlling and systematically varying the large-scale anisotropy in the flow field, and by investigating its time evolution, important knowledge of the dynamical features of the turbulent flow field will be revealed.The motions of monodisperse inertial particles of small Stokes number will be studied and compared to the motions of fluid particles. The effects of small scale anisotropy and coherent structures on the motions of inertial particles will be investigated.
Original text from CORDIS.
Participants
- REYKJAVIK UNIVERSITY · REYKJAVIKCoordinatorCity levelIceland
Links
Data: CORDIS, © European Union