Physics – Fluid Dynamics
Scientific paper
2011-09-15
Phys. Fluids 23, 101704 (2011)
Physics
Fluid Dynamics
4 pages, 2 figures, minor changes, final version published in Phys. Fluids
Scientific paper
10.1063/1.3657066
Motivated by results from recent particle tracking experiments in turbulence (Xu et al., Nat. Phys. 7, 709 (2011)), we study the Lagrangian time correlations of vorticity alignments with the three eigenvectors of the deformation-rate tensor. We use data from direct numerical simulations (DNS), and explore the predictions of a Lagrangian model for the velocity gradient tensor. We find that the initial increase of correlation of vorticity direction with the most extensive eigen-direction observed by Xu et al. is reproduced accurately using the Lagrangian model, as well as the evolution of correlation with the other two eigendirections. Conversely, time correlations of vorticity direction with the eigen-frame of the pressure Hessian tensor show differences with the model.
Chevillard Laurent
Meneveau Charles
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