Multiscale stochastic homogenization of convection-diffusion equations

Svanstedt, Nils

Applications of Mathematics, Tome 53 (2008) no. 2, pp. 143-155

Résumé

Multiscale stochastic homogenization is studied for convection-diffusion problems. More specifically, we consider the asymptotic behaviour of a sequence of realizations of the form ${\partial u^\omega _{\varepsilon }}/{\partial t} +{1}/{\epsilon _3}\,\mathcal C\bigl (T_3({x}/{\varepsilon _3}) \omega _3\bigr )\cdot \nabla u^\omega _{\varepsilon }- \div \bigl ( \alpha \bigl (T_1({x}/{\varepsilon _1})\omega _1, T_2({x}/{\varepsilon _2})\omega _2 ,t\bigr ) \nabla u^\omega _{\varepsilon }\bigr )=f$. It is shown, under certain structure assumptions on the random vector field ${\mathcal C}(\omega _3)$ and the random map $\alpha (\omega _1,\omega _2,t)$, that the sequence $\lbrace u^\omega _\epsilon \rbrace $ of solutions converges in the sense of G-convergence of parabolic operators to the solution $u$ of the homogenized problem ${\partial u}/{\partial t} - \div ( \mathcal B(t)\nabla u ) = f$.

Détail

DOI : 10.1007/s10492-008-0017-x

Classification : 35B27, 35B40, 35K57, 60H15, 76M35, 76M50
Keywords: multiscale; stochastic; homogenization; convection-diffusion