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Time splitting for wave equations in random media

Published online by Cambridge University Press:  15 December 2004

Guillaume Bal and
Lenya Ryzhik
Guillaume Bal
Affiliation:
Department of Applied Physics & Applied Mathematics, Columbia University, New York, NY 10027, USA. gb2030@columbia.edu.
Lenya Ryzhik
Affiliation:
Department of Mathematics, University of Chicago, Chicago, IL 60637, USA. ryzhik@math.uchicago.edu.
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Abstract

Numerical simulation of high frequency waves in highly heterogeneous media is a challenging problem. Resolving the fine structure of the wave field typically requires extremely small time steps and spatial meshes. We show that capturing macroscopic quantities of the wave field, such as the wave energy density, is achievable with much coarser discretizations. We obtain such a result using a time splitting algorithm that solves separately and successively propagation and scattering in the simplified regime of the parabolic wave equation in a random medium. The mathematical theory of the convergence and statistical properties of the algorithm is based on the analysis of the Wigner transforms in random media. Our results provide a step toward understanding time and space discretizations that are needed in order for the numerical algorithm to capture the correct macroscopic statistics of the wave energy density in a random medium.

Keywords

High frequency waves in random mediatime splittingmultiscale analysis.

Information

Type
Research Article
Information
ESAIM: Mathematical Modelling and Numerical Analysis , Volume 38 , Issue 6 , November 2004, pp. 961 - 987
Copyright
© EDP Sciences, SMAI, 2004

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