July 6, 2004, 4:00 p.m. (CEST)

Modelling Mathematical Background and Simulation of a waste-disposal for radioactive contaminants in a salt-dome

7/6/04, 4:00 p.m. – 5:30 p.m.
Dr. Jürgen Geiser, Institute of Computer Science, Universität Heidelberg
Our model is based on a potential waste-scenario fora disposal of radioactive contaminants transportedwith groundwater in porous media.The underlying equations are a system ofconvection-diffusion-reaction-equation coupled with thereaction-term. We present a solution method,based on the Operator-Splitting-method, to decouple themulti-physical and multi-dimensional processesin simple physical and one-dimensional processes.These simpler equations are discretised with analyticaland numerical methods. A new discretisation-method withembedded analytical solutions is introduced.We realise the discretisation and solver methods in theprogram-tool R3T (radionuclide-reaction-retardation-transport),which was based on the $UG$ (unstructed grid) software-toolbox.Numerical benchmark-problems are used to verify the new method.The realistic applications of a waste-disposal ispresented with different 2d and 3d transport and reactioncomputations. Different locations for the waste-disposalof the overlying rock present the usability of the disposals.The massive parallel computations are presented with thecomparison of uniform and adaptive computations.Finally we propose the further works.
Pfaffenwaldring 61, Raum U1.003 (MML), Universität Stuttgart
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