FE2 multi-scale framework for the two-equation model of transient heat conduction in two-phase media

Mingzhao Zhuo*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

In the study of transient heat conduction in heterogeneous two-phase media, the local thermal non-equilibrium condition calls for the use of a two-equation model to appropriately describe different temperatures in the two phases. We propose for the two-equation model an FE2 multi-scale framework that is capable of addressing nonlinear conduction problems. The FE2 framework consists of volume-averaged macroscale equations, well-defined microscale problems, and the information exchange between the two scales. Compared to a traditional FE2 method for the one-equation model, the proposed FE2 framework introduces an additional source term at the macroscale that is upscaled from the microscale interfacial heat transfer. At variance with the tangent matrices (i.e., effective conductivity) of the heat flux, the tangent matrices of the interfacial heat transfer depend on the microscopic length scale. The proposed FE2 framework is validated against single-scale direct numerical simulations, and some numerical examples are employed to demonstrate its potential.

Original languageEnglish
Article number121683
Number of pages16
JournalInternational Journal of Heat and Mass Transfer
Volume179
DOIs
Publication statusPublished - 2021

Keywords

  • computational homogenization
  • FE method
  • interfacial heat transfer
  • transient heat conduction
  • two-equation model

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