Car Cabin Sneeze Simulation | Examining Potential Spread of COVID 19 in an Air-Conditioned Vehicle

When a person sneezes, particles containing mucus and saliva eject from their nose and mouth. While few particles may be contaminated with a virus or bacteria, sneezes can be infectious to those in close proximity. Depending on the sneeze force and turbulence, particle size can range from a fine mist (aerosols) to large spray drops and can hover in surroundings from a few seconds to several minutes.

When examining a sneeze in closed car cabin with airflow from a typical air-conditioning HVAC system, sneeze particles are easily transmitted to the nearby occupants — quickly. Depending on the airflow direction and speed, particles will travel and hover inside the cabin before eventually falling to the vehicle floor. While obviously not all the particles ejected from a sneeze are contagious, it is likely that some carrying a virus or bacteria could reach a neighboring occupant. Similar phenomenon can be seen in airplane cabins, offices, or even outside.

Airflow and direction play a big role in particle distribution and therefore state-of-the-art turbulent models and particle tracking capabilities, like those found in Dassault Systemes CFD/Fluids tools, are required for accurate simulation. Learn more about our CFD/Fluids products and services at: https://www.3ds.com/products-services/simulia/products/fluid-cfd-simulation/

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The simulation(s) by Dassault Systèmes and other technical or operational information represented in this article are presented as an illustration and are for informational purposes only. Any use of information presented in or derived from this article is at the viewer’s sole risk and Dassault Systèmes disclaims all related liability.

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