Fully-coupled engineering and mesoscale simulations of thermal conductivity in UO2 fuel using an implicit multiscale approach

M. R. Tonks, G. Hansen, D. Gaston, C. Permann, P. Millett, D. Wolf

Research output: Contribution to journalConference articlepeer-review

13 Scopus citations


Though the thermal conductivity of solid UO2 is well characterized, its value is sensitive to microstructure changes. In this study, we propose a two-way coupling of a mesoscale phase field irradiation model to an engineering scale, finite element calculation to capture the microstructure dependence of the conductivity. To achieve this, the engineering scale thermomechanics system is solved in a parallel, fully-coupled, fully-implicit manner using the preconditioned Jacobian-free Newton Krylov (JFNK) method. Within the JFNK function evaluation phase of the calculation, the microstructure-influenced thermal conductivity is calculated by the mesoscale model and passed back to the engineering scale calculation. Initial results illustrate quadratic nonlinear convergence and good parallel scalability.

Original languageEnglish (US)
Article number012078
JournalJournal of Physics: Conference Series
Issue number1
StatePublished - Jan 1 2009

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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