# American Institute of Mathematical Sciences

June  2012, 5(2): 357-382. doi: 10.3934/krm.2012.5.357

## Periodic long-time behaviour for an approximate model of nematic polymers

 1 Department of Mathematical Sciences, Tsinghua University, Beijing 100084 2 CERMICS, École des Ponts ParisTech, 6 & 8, avenue Blaise Pascal, 77455 Marne-La-Vallée Cedex 2, France, France

Received  July 2011 Revised  January 2012 Published  April 2012

We study the long-time behaviour of a nonlinear Fokker-Planck equation, which models the evolution of rigid polymers in a given flow, after a closure approximation. The aim of this work is twofold: first, we propose a microscopic derivation of the classical Doi closure, at the level of the kinetic equation ; second, under specific assumptions on the parameters and the initial condition, we prove convergence of the solution to the Fokker-Planck equation to a particular periodic solution in the long-time limit.
Citation: Lingbing He, Claude Le Bris, Tony Lelièvre. Periodic long-time behaviour for an approximate model of nematic polymers. Kinetic & Related Models, 2012, 5 (2) : 357-382. doi: 10.3934/krm.2012.5.357
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