# Finite Element Heterogeneous Multiscale Method for the Wave Equation: Long Time Effects

Abdulle, Assyr and Grote, Marcus J. and Stohrer, Christian. (2014) Finite Element Heterogeneous Multiscale Method for the Wave Equation: Long Time Effects. Multiscale Modeling and Simulation: A SIAM Interdisciplinary Journal, 12 (3). pp. 1230-1257.

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Official URL: http://edoc.unibas.ch/50867/

A new finite element heterogeneous multiscale method (FE-HMM) is proposed for the numerical solution of the wave equation over long times in a rapidly varying medium. Our new FE-HMM-L method captures not only the short-time behavior of the wave field, well described by classical homogenization theory, but also more subtle long-time dispersive effects, both at a computational cost independent of the microscale. Optimal error estimates in the energy norm and the $L^2$-norm are proved over finite time intervals, which imply convergence to the solution from classical homogenization theory when both the macro- and the microscale are refined simultaneously. Numerical experiments illustrate the usefulness of the FE-HMM-L method and corroborate the theory.