Seminar series
Date
Fri, 24 May 2013
Time
10:00 -
11:00
Location
Gibson Grd floor SR
Speaker
Michel Chipot
Organisation
University of Zurich
A mini-lecture series consisting of four 1 hour lectures.
We would like to consider asymptotic behaviour of various problems set in cylinders. Let Ωℓ=(−ℓ,ℓ)×(−1,1) be the simplest cylinder possible. A good model problem is the following. Consider uℓ the weak solution to {−∂2x1uℓ−∂2x2uℓ=f(x2)in Ωℓ,uℓ=0 on ∂Ωℓ. When ℓ→∞ is it trues that the solution converges toward u∞ the solution of the lower dimensional problem below ? {−∂2x2u∞=f(x2)in (−1,1),u∞=0 on ∂(−1,1). If so in what sense ? With what speed of convergence with respect to ℓ ? What happens when f is also allowed to depend on x1 ? What happens if f is periodic in x1, is the solution forced to be periodic at the limit ? What happens for general elliptic operators ? For more general cylinders ? For nonlinear problems ? For variational inequalities ? For systems like the Stokes problem or the system of elasticity ? For general problems ? ... We will try to give an update on all these issues and bridge these questions with anisotropic singular perturbations problems. \smallskip \noindent {\bf Prerequisites} : Elementary knowledge on Sobolev Spaces and weak formulation of elliptic problems.