Persistence problem in two-dimensional fluid turbulence.

@article{Perlekar2011PersistencePI,
title={Persistence problem in two-dimensional fluid turbulence.},
author={P. Perlekar and Samriddhi Sankar Ray and D. Mitra and R. Pandit},
journal={Physical review letters},
year={2011},
volume={106 5},
pages={
054501
}
}

We present a natural framework for studying the persistence problem in two-dimensional fluid turbulence by using the Okubo-Weiss parameter Λ to distinguish between vortical and extensional regions. We then use a direct numerical simulation of the two-dimensional, incompressible Navier-Stokes equation with Ekman friction to study probability distribution functions (PDFs) of the persistence times of vortical and extensional regions by employing both Eulerian and Lagrangian measurements. We find… CONTINUE READING