The Limitations and Successes of Concurrent Dynamic Multiscale Modeling Methods at the Mesoscale

Dynamic concurrent multiscale modeling methods are reviewed and then analyzed based on their governing equations in terms of consistency in material descriptions between different scales, wave propagation across the numerical interfaces between the different descriptions, and advances in describing defects in the coarse-grained domain. The analysis finds that most methods suffer from the consequences of inconsistent materials descriptions between representations at different scales; a few methods such as Concurrent Atomistic Continuum (CAC), Coupled Atomistic Discrete Dislocation (CADD), and the coupled Extended Finite Element Method (XFEM) are capable of simulating moving defects in the coarse-scale domain to improve practicality and prediction. Application of multiscale simulation to coupled thermal and mechanical problems is showing promise. Mesoscale evolution of defects, largely beyond the reach of conventional atomistic methods, is still beyond the reach of many concurrent multiscale methods.

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