Journal
ATMOSPHERIC ENVIRONMENT
Volume 271, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2021.118857
Keywords
Navier -Stokes; Finite elements; VMS; Eulerian drift -flux; Expiratory events
Funding
- NSERC Alliance Grant [ALLRP 554 499-20]
- NSERC Discovery Grant [RGPIN-2017-03 781]
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This paper presents a modeling method for the dispersion and deposition of expelled particles in an indoor environment. The model is validated against experimental measurements and numerical data, and is applied to simulate a coughing event under different ventilation scenarios. The results demonstrate the effectiveness and robustness of the presented formulation.
Modelling the dispersion and deposition of expelled particles in an indoor environment is presented in this paper. The airflow is described by the incompressible Navier-Stokes equations, and the dispersion of a group of particles is modelled through an Eulerian transport equation coupled to the system of Navier-Stokes equations. The turbulent airflow and turbulent dispersion of particles are modelled by the variational multiscale method. Boundary integral terms are presented for weakly imposing essential boundary conditions as a wall model, and for modelling the deposition of particles on no-slip walls. The formulation is validated against experimental measurements and numerical data of the concentration of particles in a model chamber with success. A study case is presented where a coughing event is modelled in a real-life indoor environment under two different ventilation scenarios, where the first scenario considers only the air supply provided by the ceiling vents, while the second scenario considers in addition the air supply provided by two wall-mounted air conditioners. The coughing event is represented through realistic boundary conditions taken from experimental measurements. The dispersion and deposition patterns are compared between the two ventilation scenarios. The results show robustness of the presented formulation and encourages further developments in future works.
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