Modelling spreading with degassing using anisotherm viscoplastic multiphase shallow water approximation
Résumé
A tridimensional multiphase viscoplastic anisotherm free surface model is developed, it is reduced to an height-averaged bidimensional model and its use for molten nuclear core spreading is argued with dimensionless numbers. It describes the tridimensional flow as non-Newtonian, non-isothermal and a mixture of a continuous phase and gas released from a substrate. Using an adaptive finite element method based on C++ library Rheolef, simulations are ran. A sensitivity analysis on the numerical parameters and the gas inflow rate are conducted. Tridimensional solution of the problem is computed from the bidimensional height-averaged solution.
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