# COFFEE

3D BEM-accelerated solvers for linear acoustics and elastodynamics (main programmer, so far 200 000 lines of Fortran 90).
The 3-D acoustic and elastodynamic equations are solved with the boundary element method accelerated by the multi-level fast multipole method or H-matrix based fast solvers. The fundamental solutions for the infinite space are used in this implementation. A boundary element-boundary element coupling strategy is also implemented so multi-region problems (strata inside a valley for example) can be solved. An introductive documentation is available at the end of my PhD dissertation. Registered with the APP under number. IDDN.FR.001.250012.000.S.P.2015.000.31235

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# FaIMS

Fast Approximate Inverse Medium Solver (full implementation, 5 000 lines of Matlab).
The inverse problem is formulated with a Lippmann-Schwinger integral equation (Born Approximation). We use a SVD to solve the 3-D inverse problem. The direct computation of the SVD would be too expensive if a lot of data needs to be combined. We have proposed a method based on the coupling of a randomized SVD and a recursive SVD to reduce CPU time and memory requirements.

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