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对流模型的评估,以准确预测特定主体上空气道几何结构中的空气流结构

Alek Nino^1,2, Yu Feng^1,2

¹School of Chemical Engineering, Oklahoma State University, Stillwater, OK 74078.

Journal of biomechanical engineering

|July 30, 2025

概括

应力混合模拟 (SBES) 准确地预测上呼吸道空气流,优于雷诺兹-平均纳维尔-斯托克斯 (RANS) 模型. 这种混合方法为吸入疗法研究提供了大模拟 (LES) 的计算效率高的替代方案.

科学领域:

计算流体动力学 (CFD) 是一种计算流体动力学.
生物医学工程生物医学工程
呼吸系统医学呼吸系统医学

背景情况:

精确预测人类上呼吸道的空气流量对于气溶输送和吸入治疗至关重要.
大模拟 (LES) 捕捉了流,但在计算上很昂贵.
雷诺兹-平均纳维埃-斯托克斯 (RANS) 模型是高效的,但在复杂的几何学中缺乏准确性.

研究的目的:

评估 LES,RANS 和压力混合模拟 (SBES) 在模拟空气流中的计算精度和效率.
为了比较这些模型,使用对象特定的口腔到气管几何学.
为未来的气道流量模拟建立一个基准.

主要方法:

雇佣的LES作为基准,根据实验数据进行验证.
在对象特定的口腔到气管模型中模拟空气流.
评估了RANS (可实现的k-ε) 和SBES模型与速度,二次流量和动动能 (TKE) 的LES相比.

主要成果:

尽管计算效率高,但RANS模型显著低于预测的二次流和TKE.
在捕捉局部流动特征方面,SBES与LES表现出了良好的协议.
与LES相比,SBES显示平均CPU时间每代减少7%,整体CPU时间增加25%.

结论:

SBES提供了一种有前途的混合方法,用于准确高效地模拟上呼吸道空气流.
在吸入治疗应用中,SBES 提供了 LES 的准确性和 RANS 的效率之间的平衡.
需要进一步研究SBES在复杂的呼吸系统几何结构中的性能.

关键词:

雷诺兹-平均的纳维尔-斯托克斯 (RANS)计算流体动力学 (CFD) 计算流体动力学大模拟系统 (LES)口到气管的口腔到气管.肺部空气流是指肺部空气流.应力混合模拟 (SBES) 技术

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