(655f) Multiscale Simulation of the Responses of Discrete Nanostructures to Extreme Loading Conditions Based on the Material Point Method
AIChE Annual Meeting
2015
2015 AIChE Annual Meeting Proceedings
Particle Technology Forum
Nano-Energetic Materials II
Thursday, November 12, 2015 - 10:15am to 10:36am
A particle-based multiscale simulation procedure is being developed that includes a concurrent link between the Material Point Method (MPM) and Dissipative Particle Dynamics (DPD) and a hierarchical bridge from Molecular Dynamics (MD) to DPD. An interfacial scheme is being developed that can be used to effectively cast spatial discretization at different scales into a unified MPM framework. The advantage is that the interactions among discrete nanostructures can be simulated without the need for master/slave nodes as required in the Finite Element Method and other similar mesh-based methods. The multiscale simulation scheme is applied to several prototypical cases: tensile extension of a nanorod, isothermal compression of a nano-cube in a high-pressure fluid, and the behavior of nanosphere pairs and nanosphere-nanorod assemblies in a confining fluid for different initial arrangements of the components. The concurrent DPD/MPM results are in qualitative agreement with the predictions obtained using a DPD-only description and all-atom MD, but require less computational time compared to all-atom simulations.