Normal human breathing is simulated to capture details of saliva particle transport with and without a face mask. The simulations are carried out using more than 600 CPU's for 6 months. The breathing is modeled using high-resolution large-eddy simulations coupled with a novel Lagrangian particle tracking approach. Our simulations revealed that with a non-medical face mask, saliva particles stay within a roughly 1.6 ft region in front of the person. While, without a face mask and in about 1.2 minutes, the pathogen-carrying saliva particles can spread as far as 9 ft away from the person.
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