Multiscale modeling of coupled thermo-mechanical behavior of granular media in large deformation and flow: Fid-Bau Portal

Multiscale modeling of coupled thermo-mechanical behavior of granular media in large deformation and flow

Zhao, Shiwei / Zhao, Jidong / Liang, Weijian / Niu, Fujun

Abstract Heat generation and transfer in a granular material can be intricately coupled with their mechanical responses, playing a key role in causing excessive large deformation, flow and failure of the material. The coupling may manifest in various forms, including thermal induced stress, mechanically induced heat and thermally induced melting in granular media. We propose a novel hierarchical multiscale modeling framework, TM-DEMPM, to model the coupled thermo-mechanical behavior in granular media which may undergo large deformation and flow. Material Point Method (MPM) is hierarchically coupled with Discrete Element Method (DEM) to offer physics-based, natural scale-crossing simulations of thermo-mechanical granular responses without assuming complicated phenomenological constitutive models. To offer speedup for the numerical solution, hybrid OpenMP and GPU-based parallelization is proposed to take advantage of the hierarchical computing structure of the framework. The proposed framework may provide an effective and efficient pathway to next-generation simulation of engineering-scale large-deformation problems that involve complicated thermo-mechanical coupling in granular media.

Highlights • Thermo-mechanical (TM) response of granular media is seamlessly coupled at the meso scale. • A multiscale approach is proposed to rigorously tackle TM coupling of granular media in large deformation and flow. • Thermal induced stress, mechanically generated heat and thermally induced melting are considered. • The predictive capabilities and features of the proposed approach are demonstrated.