Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1896863 | Physica D: Nonlinear Phenomena | 2015 | 13 Pages |
Abstract
As an example of life at high Reynolds number, we investigate the dynamics of the Fisher equation for the spreading of micro-organisms in one dimension subject to both turbulent convection and diffusion. We show that for strong enough turbulence, bacteria, for example, track, in a quasilocalized fashion (with remarkably long persistence times), sinks in the turbulent field. An important consequence is a large reduction in the carrying capacity of the fluid medium. We analytically determine the regimes where this quasi-localized behavior occurs and test our predictions by numerical simulations.
Related Topics
Physical Sciences and Engineering
Mathematics
Applied Mathematics
Authors
Roberto Benzi, David R. Nelson,