This CFD scenario represents 6 m x 6 m x 3 m room with particle laden air coming from the purifier units.
The particle-laden airflow helps identify the stagnation zones in the room where the air circulation is negligible. As the particles stagnate, they turn red highlighting the stangnation zones.
These stagnation zones potentially serve as virus prone region and the unit with minimal stagnation zones is the most effective in disinfecting the room.
9 million Cells Turbulent Simulation using Mantaflow.