Growth of Smaller Grain Attached on Larger One: Algorithm to Overcome Unphysical Overlap between Grain

TL;DR

This paper presents an algorithm that prevents unphysical overlaps in grain growth simulations by introducing additional velocity to preserve momentum, enabling more accurate modeling of growing grains attached to larger ones.

Contribution

The proposed algorithm effectively eliminates unphysical overlaps in grain growth simulations by incorporating growth-induced velocity in an implicit step, improving simulation accuracy.

Findings

Successfully eliminates unphysical overlap in simulations.

Preserves system linear momentum during growth.

Applicable to systems with fast-growing grains.

Abstract

As a smaller grain, which is attached on larger one, is growing, it pushes also the larger one and other grains in its surrounding. In a simulation of similar system, repulsive force such as contact force based on linear spring-dashpot model can not accommodate this situation when cell growing rate is faster than simulation time step, since it produces sudden large overlap between grains that makes unphysical result. An algorithm that preserves system linear momentum by introducing additional velocity induced by cell growth is presented in this work. It should be performed in an implicit step. The algorithm has successfully eliminated unphysical overlap.