Assuming the force field for atoms in your system are already, the sintering simulation is just standard NVT MD simulation at high temperature. The critical point is the system structure preparation that represents the particles in the sintering. You can try to follow the method in the following paper. They simulated only two particles for sintering models in a certain box.
Article An insight into the temperature-dependent sintering mechanis...
You can do it thermally as the sintering goes on within two decoupling zones, particles shrinkage by densification, and growth by particles coarsening behaviours. Please follow the article in the following RG link to stand on full story related to particle sintering by calcination of the loose powder.
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Article Investigating the effects of calcination temperatures on the...