With the emergence and worsening of the novel coronavirus (Sars-Cov-2) pandemic in 2020, it has become necessary to control indoor occupancy rates through the strategy of social distancing, to mitigate contamination in these places. However, the measures taken to define the distance between people are essentially qualitative in nature. This study therefore sets out to investigate the characteristics of this discrete-phase (droplets) and continuous-phase (air) droplet dispersion system using a multiphysics approach, in order to quantify the acceptable occupancy rates of a classroom under different conditions (for example, seating arrangement and/or ventilation system planning). The work was carried out in a three-dimensional environment and the numerical resolution will be done using the finite element method. The COMSOL software and its complementary computational fluid dynamics (CFD) and particle trajectory definition (Particle Tracing) modules were used as tools to assess the behavior of the mechanical transport vectors of respiratory viruses. The aim is to identify optimized conditions for an example room, since this can serve as a parameter for determining ducts in similar environments.