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• W1983744771 abstract "Knowledge of how air flows through the nasal passages relies heavily on model studies, as the complexity and relative inaccessibility of the anatomy prevents detailed in vivo measurement. Almost all models to date fail to incorporate the geometry of the external nose, instead employing a truncated inflow. Typically, flow is specified to enter the model domain either directly at the nares (nostrils), or via an artificial pipe inflow tract attached to the nares. This study investigates the effect of the inflow geometry on flow predictions during steady nasal inspiration. Models that fully replicate the internal and external nasal airways of two anatomically distinct subjects are used as a reference to compare the effects of common inflow treatments on physiologically relevant quantities including regional wall shear stress and particle residence time distributions. Inflow geometry truncation is found to affect flow predictions significantly, though slightly less so for the subject displaying more pronounced passage area contraction up to the internal nasal valve. For both subject geometries, a tapered pipe inflow provides a better approximation to the natural inflow than a blunt velocity profile applied to the nares. Computational modelling issues are also briefly outlined, by comparing quantities predicted using different surface tessellations, and by evaluation of domain-splitting techniques." @default.
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• W1983744771 creator A5049249465 @default.
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• W1983744771 date "2009-09-09" @default.
• W1983744771 modified "2023-09-25" @default.
• W1983744771 title "Inflow boundary profile prescription for numerical simulation of nasal airflow" @default.
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• W1983744771 doi "https://doi.org/10.1098/rsif.2009.0306" @default.
• W1983744771 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2842801" @default.
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