Meddouri--Bernard, M. Edouard (2023) Propagation des ondes dans un milieu aléatoire à micro-structure à temps long et localisation PRE - Research Project, ENSTA.

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The goal of this project is to study the wave equation in different heterogeneous media. First, we started by studying the case of a medium with periodic microstructure. We then showed that in the framework of such a medium, the wave equation is well-posed. Then, we carried out a formal development to find a homogeneous equation approximating the wave equation in a heterogeneous medium. We subsequently demonstrated the convergence of the heterogeneous solution to the homogeneous solution. Next, we numerically implemented both the homogeneous and the heterogeneous solutions, initially for short times and then for long times. In the latter case, the homogeneous solution does not sufficiently approximate the heterogeneous solution. Following this, we revisited the formal calculations to determine a finer approximation which we in turn implemented. Finally, we adapted our algorithm to the case of a stationary random microstructure.

Item Type:Thesis (PRE - Research Project)
Uncontrolled Keywords:Wave equation, Homogenization, Periodic homogenization, Stochastic homogenization, Periodic homogenization theorem, Long time behavior, Fourier method
Subjects:Mathematics and Applications
ID Code:9712
Deposited By:Edouard MEDDOURI--BERNARD
Deposited On:04 sept. 2023 09:49
Dernière modification:04 sept. 2023 09:49

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