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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)

- 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)

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, 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)

- Prasad Perlekar, Nairita Pal, Rahul Pandit
- Scientific reports
- 2017

We study two-dimensional (2D) binary-fluid turbulence by carrying out an extensive direct numerical simulation (DNS) of the forced, statistically steady turbulence in the coupled Cahn-Hilliard and Navier-Stokes equations. In the absence of any coupling, we choose parameters that lead (a) to spinodal decomposition and domain growth, which is characterized by… (More)

- Rohith V Swaminathan, S Ravichandran, Prasad Perlekar, Rama Govindarajan
- Physical review. E
- 2016

The merger of two like-signed vortices is a well-studied problem, but in a turbulent flow, we may often have more than two like-signed vortices interacting. We study the merger of three or more identical corotating vortices initially arranged on the vertices of a regular polygon. At low to moderate Reynolds numbers, we find an additional stage in the merger… (More)

- Luca Scarbolo, Dafne Molin, Prasad Perlekar, Mauro Sbragaglia, Alfredo Soldati, Federico Toschi
- J. Comput. Physics
- 2013

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