  The strategy to install Borexino's Thermal Monitoring and Management System
(BTMMS) successfully stabilized the thermal environment inside the Borexino
neutrino observatory, which is understood to be a necessary step to improve and
minimize radioactive background contamination inside the active volume of the
detector, allowing for it to achieve better sensitivity in the regions of
interest. Two-dimensional numerical simulations to achieve a proper
understanding of Borexino's fluid-dynamics were developed and optimized for
different regions and periods of interest, focusing on the most critical
effects that were identified as influencing background concentrations.
Literature experimental case studies were reproduced to benchmark the method
and settings, and a Borexino-specific benchmark was constructed in order to
validate the model's thermal transport. Finally, fully-convective models were
implemented to understand general and specific fluid motions impacting the
active detector volume.
