Large diffusivity finite-dimensional asymptotic behaviour of a semilinear wave equation

[摘要] We study the effects of large diffusivity in all parts of the domain ina linearly damped wave equation subject to standard zero Robin-type boundary conditions. In the linear case, we showin a given sense that the asymptotic behaviour of solutions verifies a second-order ordinary differential equation. In the semilinear case, under suitable dissipative assumptions on the nonlinear term, we prove the existence of a global attractor for fixed diffusion and that the limiting attractor for large diffusion is finite dimensional.

[学科分类] 应用数学