Effect of inflow boundary condition on nasal transitional flow

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  • 鼻腔内遷移流れに及ぼす流入速度分布の影響

Abstract

<p>The nose plays an important role by filtering, warming, and humidifying inspired air. Thus, modeling of airflow in the nasal cavities is important for evaluating nasal functions. Recently, experimental studies showed that airflow in nasal cavity has unsteadiness such as laminar to turbulent transitional flow3,4. Because of advances in computing performance, direct numerical simulation (DNS) was performed to predict transitional airflow in the nasal cavity without turbulence models5. Several studies prescribed simplified flat inflow velocity profile, whereas Taylor et al. 6 showed that the use of truncated inflow in models of nasal inspiration affects the flow within the nasal cavity. The present study investigates the effect of inflow velocity profile on transitional flow during steady nasal inspiration with DNS. As a result, a breakdown of a free shear layer is confirmed behind the nasal valve in the natural velocity profile, whereas, in the flat velocity profile, shear layer is stable. The inflow boundary profile is found to affect the stability of a free shear layer behind the nasal valve. Therefore it is important to consider actual inflow velocity profile surrounding the external face to predict transitional flow in the nasal cavity.</p>

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