Towards a general multiscale methodology for the simulation of thermal behavior of granular media

Resumo

This work presents a continuum-discrete hierarchical multiscale methodology based on data-driven
computations of the microscale response to simulate heat conduction in static granular materials. The effective
thermal conductivity tensors of the continuous method at the macroscale is obtained from a database of microscale results. The microscale database is created by generating and homogenizing several Representative Volume Elements (RVEs) in order to relate the thermal conductivity of the granular material to its microstructural
properties. In this study, these properties are the local porosities and anisotropies, which are inputs of the database to obtain the conductivity. An easy yet efficient protocol for RVE generation and homogenization is also presented.