  (1) Introduction: New technologies that leverage gas hydrates phenomena
include carbon capture and sequestrations. These processes are often
semi-continuous and require regulation of the system's flow properties for
proper operation. Accurate computational models for the viscosity of carbon
dioxide hydrate systems at pre-nucleation conditions can be important for
process design and control of such technologies. (2) Methods: This work
validates the viscosity predictions of molecular dynamics simulations using
previously measured experimental data. The TIP4P/Ice force field was used to
model water, while the EPM2, TraPPE, and Zhang force fields were used for
carbon dioxide. The Green-Kubo and Einstein formulations of viscosity and
diffusivity were used in this work. (3) Results: All force fields overpredicted
viscosity when compared to experimental data, but EPM2 resulted in lower
discrepancies. Additionally, EPM2 was determined to model molecular behavior
expected from the macroscopic trends in viscosity with respect to temperature
and pressure. (4) Conclusions: The EPM2 force field more accurately predicted
the viscosity of carbon dioxide hydrates systems at pre-nucleation conditions
relative to TraPPE and Zhang.
