Abstract
This paper presents a new approach to a local time-space grid refinement for a staggered-grid finite-difference simulation of waves. The approach is based on approximation of a wave equation at the interface where two grids are coupled. As no interpolation or projection techniques are used, the finite-difference scheme preserves second order of convergence. We have proved that this approach is low-reflecting, the artificial reflections are about 10 − 4 of an incident wave. We have also shown that if a successive refinement is applied, i.e. temporal and spatial steps are refined at different interfaces, this approach is stable.
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Lisitsa, V., Reshetova, G. & Tcheverda, V. Finite-difference algorithm with local time-space grid refinement for simulation of waves. Comput Geosci 16, 39–54 (2012). https://doi.org/10.1007/s10596-011-9247-1
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DOI: https://doi.org/10.1007/s10596-011-9247-1
Keywords
- Seismology
- Wave equation
- Finite differences
- Local mesh refinement
- Local time stepping
- Discontinuous grids