Yellowjacket: Coupling Gibbs Energy Minimisation with Phase Field Method for Corrosion Modelling in Molten Salt Reactors

Parikshit Bajpai

Chaitanya Bhave, Max Poschmann, Daniel Schwen, Michael Tonks, Markus Piro

Ontario Tech University; University of Florida; Idaho National Laboratory.


Predicting the complex multiscale, multiphysics behaviour of nuclear materials requires tools capable of simulating problems exhibiting very tight coupling between different physical phenomena. This strongly coupled nature of physical phenomena is particularly relevant in the Molten Salt Reactors (MSR) and poses a challenge in design and development of the reactors as hitherto insignificant effects become conspicuous. One such behaviour is the corrosion of structural materials by the molten salt. Corrosion is an electrochemical process driven by the thermodynamics and kinetics of the reactions. Furthermore, the microstructure of the material also significantly affects the corrosion behaviour. Corrosion modelling at mesoscale therefore requires coupling the Gibbs energy minimisation method for calculating thermodynamic equilibrium with the phase field method for microstructural evolution. To this aim, a new application, Yellowjacket, is being developed and it is built on the Idaho National Laboratory’s Multiphysics Object Oriented Simulation Environment (MOOSE). This work describes the recent progress towards development of Yellowjacket and presents some preliminary results demonstrating simulation capabilities of interest to the development of MSRs.

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Wednesday – 15th September 2021
Parikshit Bajpai