The accuracy of the numerical result is closely related to mesh density as well as its distribution. Mesh plays a very significant role in the outcome of numerical simulation. Many nasal airflow studies have employed unstructured mesh and more recently hybrid mesh scheme has been utilized considering the complexity of anatomical architecture. The objective of this study is to compare the results of hybrid mesh with unstructured mesh and study its effect on the flow parameters inside the nasal cavity. A three-dimensional nasal cavity model is reconstructed based on computed tomographic images of a healthy Malaysian adult nose. Navier-Stokes equation for steady airflow is solved numerically to examine inspiratory nasal flow. The pressure drop obtained using the unstructured computational grid is about 22.6 Pa for a flow rate of 20 L/min, whereas the hybrid mesh resulted in 17.8 Pa for the same flow rate. The maximum velocity obtained at the nasal valve using unstructured grid is 4.18 m/s and that with hybrid mesh is around 4.76 m/s. Hybrid mesh reported lower grid convergence index (GCI) than the unstructured mesh. Significant differences between unstructured mesh and hybrid mesh are determined highlighting the usefulness of hybrid mesh for nasal airflow studies.
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机译：数值结果的准确性与网格密度及其分布密切相关。网格在数值模拟的结果中起着非常重要的作用。考虑到解剖结构的复杂性，许多鼻气流研究已经采用了非结构化网格，并且最近使用了混合网格方案。这项研究的目的是比较混合网格和非结构网格的结果，并研究其对鼻腔内流动参数的影响。基于健康的马来西亚成年鼻子的计算机断层图像，重建了三维鼻腔模型。数值求解稳定气流的Navier-Stokes方程，以检查吸气的鼻流量。对于20structureL / min的流量，使用非结构化计算网格获得的压降约为22.6 Pa，而对于相同的流量，混合网格的压降为17.8 Pa。使用非结构化格栅在鼻瓣处获得的最大速度为4.18 m / s，而使用混合网孔时的最大速度为4.76 m / s。混合网格报告的网格收敛指数（GCI）低于非结构化网格。确定了非结构化网格和混合网格之间的显着差异，突出了混合网格在鼻气流研究中的有用性。
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