Averaged dynamics of time-periodic advection diffusion equations in the limit of small diffusivity

作者：Schaefer Tobias; Poje Andrew C; Vukadinovic Jesenko

来源：Physica D: Nonlinear Phenomena , 2009, 238(3): 233-240.

DOI：10.1016/j.physd.2008.10.015

• Advection-diffusion
• Lie averaging
• Persistent patterns

We study the effect of advection and small diffusion on passive tracers. The advecting velocity field is assumed to have mean zero and to possess time-periodic stream lines. Using a canonical transform to action-angle variables followed by a Lie transform, we derive an averaged equation describing the effective motion of the tracers. An estimate for the time validity of the first-order approximation is established. For particular cases of a regularized vortical flow we present explicit formulas for the coefficients of the averaged equation both at first and at second order. Numerical simulations indicate that the validity of the above first-order estimate extends to the second order.

• 出版日期2009-2