Mixed Finite Elements and Operator Splitting For Flow and Transport Around a Deep Nuclear Repository

Time:	October 30, 2007, 4:00 p.m. – 5:30 p.m.
Lecturer:	Amel Sboui, PhD ANDRA (National Radioactive Waste Management Agency), Paris
Venue:	Pfaffenwaldring 61, Raum U1.003 (MML), Universität Stuttgart
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"The aim of my thesis is to model and develop numerical tools adapted to study underground water flow and the propagation of pollutants in a porous medium. The main motivation of this work is a benchmark from GDR Momas and Andra to simulate the 3-D propagation of radionuclides around a deep disposal of nuclear waste.

Firstly, we construct a new mixed finite elements method suitable for general hexahedral meshes. Convergence of the method is proved and shown in numerical experiments. Secondly, we present a method of time dicretisation for the advection equation which allows for the use of different time steps in different subdomains in order to take into account of strong heterogeneities. Finally a numerical method for the calculation of the transport of contaminants is proposed. The techniques above were implemented in a 3-D code and simulation results are shown on the 3-D far field benchmark from GDR Momas and Andra."