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Space-time domain decomposition for advection-diffusion problems in mixed formulations

Abstract : This paper is concerned with the numerical solution of porous-media flow and transport problems , i. e. heterogeneous, advection-diffusion problems. Its aim is to investigate numerical schemes for these problems in which different time steps can be used in different parts of the domain. Global-in-time, non-overlapping domain-decomposition methods are coupled with operator splitting making possible the different treatment of the advection and diffusion terms. Two domain-decomposition methods are considered: one uses the time-dependent Steklov–Poincaré operator and the other uses optimized Schwarz waveform relaxation (OSWR) based on Robin transmission conditions. For each method, a mixed formulation of an interface problem on the space-time interface is derived, and different time grids are employed to adapt to different time scales in the subdomains. A generalized Neumann-Neumann preconditioner is proposed for the first method. To illustrate the two methods numerical results for two-dimensional problems with strong heterogeneities are presented. These include both academic problems and more realistic prototypes for simulations for the underground storage of nuclear waste.
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Preprints, Working Papers, ...
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Contributor : Caroline Japhet Connect in order to contact the contributor
Submitted on : Thursday, March 31, 2016 - 6:03:05 PM
Last modification on : Tuesday, October 19, 2021 - 10:54:36 AM
Long-term archiving on: : Friday, July 1, 2016 - 9:46:34 PM


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  • HAL Id : hal-01296348, version 1


Thi-Thao-Phuong Hoang, Caroline Japhet, Michel Kern, Jean E. Roberts. Space-time domain decomposition for advection-diffusion problems in mixed formulations. 2016. ⟨hal-01296348v1⟩



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