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首页> 美国卫生研究院文献>Journal of the Royal Society Interface >Inflow boundary profile prescription for numerical simulation of nasal airflow
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Inflow boundary profile prescription for numerical simulation of nasal airflow

机译：鼻气流数值模拟的流入边界轮廓处方

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摘要

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.
机译：空气如何流经鼻腔通道的知识在很大程度上取决于模型研究，因为解剖结构的复杂性和相对不可及性阻止了详细的体内测量。迄今为止，几乎所有型号均未采用外鼻的几何形状，而是采用截断的流入。通常，指定流量直接在鼻孔（鼻孔）处或通过附着在鼻孔上的人工管道流入管道进入模型域。这项研究调查了稳定的鼻吸过程中流入几何形状对流量预测的影响。完全复制两个解剖学上不同的受试者的鼻内外气道的模型用作比较常见流入治疗对生理学相关量（包括区域壁切应力和颗粒停留时间分布）的影响的参考。发现流入几何形状的截断会显着影响流量预测，尽管对对象的显示要小得多，但对于显示直至鼻内瓣膜的更明显的通道面积收缩而言，影响较小。对于两种对象的几何形状，与应用于鼻孔的钝速度分布相比，锥形管流入量可以更好地逼近自然流入量。通过比较使用不同表面曲面细分预测的数量以及评估域分裂技术，还简要概述了计算建模问题。

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