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- S Pigolotti, R Benzi, P Perlekar, M H Jensen, F Toschi, D R Nelson
- Theoretical population biology
- 2013

We study an individual based model describing competition in space between two different alleles. Although the model is similar in spirit to classic models of spatial population genetics such as the stepping stone model, here however space is continuous and the total density of competing individuals fluctuates due to demographic stochasticity. By means of… (More)

Organisms often grow, migrate and compete in liquid environments, as well as on solid surfaces. However, relatively little is known about what happens when competing species are mixed and compressed by fluid turbulence. In these lectures we review our recent work on population dynamics and population genetics in compressible velocity fields of one and two… (More)

- Prasad Perlekar, Roberto Benzi, David R Nelson, Federico Toschi
- Physical review letters
- 2010

We study the statistical properties of population dynamics evolving in a realistic two-dimensional compressible turbulent velocity field. We show that the interplay between turbulent dynamics and population growth and saturation leads to quasilocalization and a remarkable reduction in the carrying capacity. The statistical properties of the population… (More)

- Prasad Perlekar, Samriddhi Sankar Ray, Dhrubaditya Mitra, Rahul Pandit
- Physical review letters
- 2011

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… (More)

- Sudhir Srivastava, Prasad Perlekar, Jan H M ten Thije Boonkkamp, Nishith Verma, Federico Toschi
- Physical review. E, Statistical, nonlinear, and…
- 2013

A lattice Boltzmann method for axisymmetric multiphase flows is presented and validated. The method is capable of accurately modeling flows with variable density. We develop the classic Shan-Chen multiphase model [Phys. Rev. E 47, 1815 (1993)] for axisymmetric flows. The model can be used to efficiently simulate single and multiphase flows. The convergence… (More)

- Prasad Perlekar, Roberto Benzi, Herman J H Clercx, David R Nelson, Federico Toschi
- Physical review letters
- 2014

We study the competition between domain coarsening in a symmetric binary mixture below critical temperature and turbulent fluctuations. We find that the coarsening process is arrested in the presence of turbulence. The physics of the process shares remarkable similarities with the behavior of diluted turbulent emulsions and the arrest length scale can be… (More)

- R Benzi, M Sbragaglia, P Perlekar, M Bernaschi, S Succi, F Toschi
- Soft matter
- 2014

By using fluid-kinetic simulations of confined and concentrated emulsion droplets, we investigate the nature of space non-homogeneity in soft-glassy dynamics and provide quantitative measurements of the statistical features of plastic events in the proximity of the yield-stress threshold. Above the yield stress, our results show the existence of a finite… (More)

- Akshay Bhatnagar, Anupam Gupta, Dhrubaditya Mitra, Prasad Perlekar, Michael Wilkinson, Rahul Pandit
- Physical review. E
- 2016

Small particles in suspension in a turbulent fluid have trajectories that do not follow the pathlines of the flow exactly. We investigate the statistics of the angle of deviation ϕ between the particle and fluid velocities. We show that, when the effects of particle inertia are small, the probability distribution function (PDF) P_{ϕ} of this deviation angle… (More)