engleski

On persistent primary variables for numerical modeling of gas migration in a nuclear waste repository

We present a compositional compressible two-phase, liquid and gas, flow model for numerical simulations of hydrogen migration in deep geological radioactive waste repository. This model includes capillary effects and gas diffusivity. The choice of the main variables in this model, total or dissolved hydrogen mass concentration and liquid pressure, leads to a unique and consistent formulation, no matter whether there is a gas phase or not. After introducing and explaining our model, we show computational evidences of its adequacy to simulate gas phase appearance and disappearance in different but typical situations for gas migration in an underground radioactive waste repository.

two-phase flow; compositional flow; porous medium; underground nuclear waste management; gas migration

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