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Numerical study of the impact of glottis properties on the airflow field in the human trachea using V-LES
Respiratory Physiology & Neurobiology ( IF 2.3 ) Pub Date : 2021-09-10 , DOI: 10.1016/j.resp.2021.103784
Wenjuan Chen 1 , Li Wang 1 , Liang Chen 2 , Haiwen Ge 3 , Xinguang Cui 1
Affiliation  

The influences of the profiles and cross-sectional areas of glottal aperture on the upper respiratory airway are investigated using an idealized cast-based mouth-throat model and three dimensional computational fluid dynamics (CFD). The open source CFD code OpenFOAM is employed. The transient flows are modeled using the very-large eddy simulation with the Smagorinsky sub-grid scale (SGS) model. Five different shapes of glottis are considered, including circular glottis with 100 %, 75 % and 50 % cross-sectional area and elliptic glottis with 75 % and 50 % cross-sectional area. Both instantaneous and averaged flow fields are analyzed. It is found that the variations of glottis have great impacts on the properties of downstream flow fields such as the secondary flow, laryngeal jet, recirculation zone, turbulent kinetic energy, and vortex. Evident impacts are observed in the region within 6 tracheal diameters downstream of the glottis. The profile of the glottis has more impacts on the laryngeal shape, while the cross-sectional area has more impacts on velocity of the laryngeal jet and turbulent intensity. It is concluded that both the glottal areas and profiles are critical for an idealized geometrical mouth-throat model.



中文翻译:

声门特性对人气管气流场影响的数值研究

使用理想化的基于铸件的嘴-喉模型和三维计算流体动力学 (CFD) 研究声门开口的轮廓和横截面积对上呼吸道的影响。采用开源 CFD 代码 OpenFOAM。瞬态流动使用 Smagorinsky 亚网格尺度 (SGS) 模型的超大涡流模拟进行建模。考虑了五种不同形状的声门,包括具有 100%、75% 和 50% 横截面积的圆形声门和具有 75% 和 50% 横截面积的椭圆形声门。分析瞬时和平均流场。研究发现,声门的变化对下游流场的二次流、喉射流、再循环区、湍动能和涡流等性质有很大影响。在声门下游 6 个气管直径范围内观察到明显的影响。声门的轮廓对喉部形状的影响较大,而横截面积对喉部射流的速度和湍流强度的影响较大。可以得出结论,声门区域和轮廓对于理想化的几何嘴-喉模型都是至关重要的。

更新日期:2021-09-13
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