[Soft-matter] Soft Matter and Stat Phys Seminar on 5 Nov 2021

[Maciej Lisicki]

Dear Soft Matter Colleagues and Friends,

On Friday 5 November 2021 at 9:30 AM at the UW Faculty of Physics (Pasteura 5, Warsaw; room 1.40) we are hosting a seminar during which

Krzysztof Mizerski (IGF PAN)

will give a talk

Negative diffusion effects in magnetohydrodynamic turbulence induced by fluctuations of the Lorentz force

Abstract
The turbulent hydro-magnetic dynamo is a process of magnetic field amplification by a chaotic flow of an electrically conducting fluid, responsible for generation of the magnetic fields of planets and stars. Here we demonstrate a curious effect of the Lorentz force, which can act to intensify the magnetic fields, counter intuitively in light of the Lenz law according to which the Lorentz force acts to retard motions and saturate the dynamo-induced magnetic field. However, the net effect of its small-scale fluctuations in a turbulent flow is far from obvious and it is shown that it can lead to amplification rather than saturation of the magnetic energy through creation of negative turbulent diffusivity.

We warmly welcome everyone to attend the talk and the Soft Matter Coffee Break after the seminar, held in room 4.51 (4th floor).

Maria Ekiel-Jeżewska
Maciej Lisicki
Piotr Szymczak

P.S. The attendees of last week’s seminar by Robert J. Budzyński can see his slides and browser-based simulations under this link: https://rjb-vicsek.surge.sh/Presentation/vicsek.md.html <https://rjb-vicsek.surge.sh/Presentation/vicsek.md.html>


--
Dr Maciej Lisicki
Institute of Theoretical Physics | Faculty of Physics
University of Warsaw
softmatter.fuw.edu.pl <http://softmatter.fuw.edu.pl/>





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