Hossein Seyedzadeh

Lagrangian dynamics of particle transport in oral and nasal breathing

• Authors Details :  
• Hossein Seyedzadeh,  
• Wayne Oaks,  
• Jonathan Craig,  
• Mustafa Aksen,  
• Mario Sanchez Sanz,  
• Ali Khosronejad

Journal title : Physics of Fluids

Publisher : AIP Publishing

Online ISSN : 1089-7666

Journal volume : 35

Journal issue : 8

23 Views Original Article

We present a large-eddy simulation (LES) of saliva particle transport during normal human breathing through the nose and mouth. The flow of the air–saliva mixture is modeled using an Eulerian LES that is coupled with a Lagrangian particle tracking module to obtain trajectories of saliva particles in a room with stagnant air conditions. The coupled Eulerian–Lagrangian simulation yields novel insights into the intricate dynamics of Lagrangian coherent structures (LCS) and fundamental material lines that emerge from the saliva particles' trajectories during several breathing cycles. Further, we systematically compare the quantitative LCS diagnostics of mouth breathing with those of mouth and nose normal breathing. Analyzing the simulation results of human breathing from the mouth and nose, we show that, soon after the first breathing cycle, saliva particles form a series of roll-up vortex rings that propagate forward. The forward propagation of these vortex rings leads to the formation of an asymmetrical primary forefront vortex. The individual vortex rings continuously propagate forward, merging with the forefront vortex, and ascending along the limb of the leading vortex.

Article DOI & Crossmark Data

DOI : https://doi.org/10.1063/5.0163658

Article Subject Details

• Engineering
• Mechanical Engineering

Article Keywords Details

• Aerosols
• Biofluids
• Turbulence simulations
• Vortex dynamics
• Lagrangian mechanics

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