Abstract

The main concern in Molecular Dynamics (MD) simulations is the computational cost, and coarse-graining methods accelerate simulations by reducing the degrees of freedom in the system. Yet, the utilization of these methods should be carefully followed. In this paper, we presented an energy-based coarse-graining method for Tersoff and Stillinger-Weber potential functions. The presented coarse-graining method is based on the domain mapping and modification of potential function. The focus of this paper is on Carbon and Silicon materials; however, this method can be applied to model other materials for which Tersoff and Stillinger-Weber potentials are defined. This method has been validated by demonstrating the consistency of mechanical properties between all-atom and CG models in different case studies. According to the conducted simulations, the precision of the proposed CG technique in the modeling of the bulk behavior is near 100% while it yields completely reasonable results for other simulation setups.

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