What is COFFEE?

COFFEE is a 3D fast Boundary Element solver for linear acoustic and (visco)-elastodynamics developed at POEMS (CNRS/ENSTA/INRIA). Its main capabilities include:

  • An acceleration of the boundary element method by the multi-level fast multipole method or hierarchical matrices, depending on the nature of the problem
  • Full-space or half-space fundamental solution (Helmholtz or elastodynamics) based formulations
  • Boundary element-boundary element coupling strategy to consider multi-region problems (e.g., strata inside a valley for elastodynamics problems)
  • Various analytic or algebraic preconditioners
  • A mesh adaptation strategy to improve the convergence with respect to the number of degrees of freedom
  • Solutions in the time-domain by applying a Fast Fourier Transform or a Convolution Quadrature Method

COFFEE References

  1. Metric-based anisotropic mesh adaptation for 3D acoustic boundary element methods, S. Chaillat, S. Groth and A. Loseille, (2018). Journal of Computational Physics , Vol. 372, pp. 473-499.
  2. Fast iterative boundary element methods for high-frequency scattering problems in 3D elastodynamics, S. Chaillat, M. Darbas and F. Le Louër, (2017). Journal of Computational Physics, Vol. 341, pp. 429–446.
  3. Theory and implementation of H-matrix based iterative and direct solvers for Helmholtz and elastodynamic oscillatory kernels, S. Chaillat, L. Desiderio and P. Ciarlet, (2017). Journal of Computational Physics, Vol. 351, pp. 165–186.
  4. A new Fast Multipole formulation for the elastodynamic half-space Green's tensor, S. Chaillat and M. Bonnet, (2014). Journal of Computational Physics, Vol. 258, pp. 787-808.
  5. A new fast multi-domain BEM to model seismic wave propagation and amplification in 3D geological structures, S. Chaillat, M. Bonnet and J.F. Semblat, (2009). Geophys. J. Int., Vol. 177, pp. 509-531.
  6. A multi-level fast multipole BEM for 3-D elastodynamics in the frequency domain, S. Chaillat, M. Bonnet and J.F. Semblat, (2008). Computer Methods in Applied Mechanics and Engineering, Vol. 197, pp. 4233-4249.

Contact

Obtaining COFFEE

COFFEE is the property of CNRS and INRIA. It is free for evaluation purposes and non-commercial uses. It cannot be included in any third package without prior agreement. Please send an email to Stéphanie Chaillat-Loseille for more details

Examples

Some acoustic and elastic wave propagation simulations powered by COFFEE.

!!!! Under construction !!!!

© CNRS 2019.