Where Gravity Fades: Adapting CFD Models for Extra-terrestrial Greenhouses

This paper investigates the adaptation of computational fluid dynamics (CFD) models initially developed for terrestrial greenhouses, for application in extraterrestrial plant growth environments such as in orbit, on the Moon, or on Mars. Current CFD models in terrestrial greenhouses simulate complex microclimates by investigating airflow, temperature, humidity, and plant canopy interactions. However, extraterrestrial environments present unique challenges, including reduced gravity, artificial lighting, and controlled ventilation, requiring modification of several fundamental model parameters. Drawing from the works of Fatnassi et al. and Poulet et al., this study outlines necessary adjustments to key equations governing free convection, stomatal and leaf boundary layer conductance, and gas exchange processes under non-Earth gravitational forces. This work aims to establish the foundation of CFD models that are adapted to controlled life-support systems for space missions, facilitating realistic long-term simulations of plant growth under extraterrestrial conditions.