Prof. Dr. Gregoire Allaire, (Ecole Polytechnique): Looking for the hot spot: homogenization of....
Thursday, 14.06.2012 16:30 im Raum M5
"Looking for the hot spot: homogenization of a convection-diffusion
equation" (joint work with I. Pankratova and A. Piatnitski)
We consider the homogenization of a non-stationary convection-diffusion equation posed in a bounded domain with periodically oscillating coefficients and homogeneous Dirichlet boundary conditions. Assuming that the convection term is large, we give the asymptotic profile of the solution and determine its rate of decay. In particular, it allows us to characterize the ``hot spot'', i.e., the precise asymptotic location of the solution maximum which lies lose to the domain boundary and is also the point of concentration. Due to the competition between convection and diffusion, the position of the ``hot spot'' is not always intuitive as exemplified in some numerical tests.