LIU Lijuan,SUO Wenchao.Characteristics of Airflow in Lower Respiratory Tract of ARDS Patients[J].Journal of medical biomechanics,2019,34(5):460-467
Characteristics of Airflow in Lower Respiratory Tract of ARDS Patients
Received:October 10, 2018  Revised:November 25, 2018
Chinese key words:  急性呼吸窘迫综合征  下呼吸道  计算流体动力学  气流  数值模拟
English Key words:acute respiratory distress syndrome (ARDS)  lower respiratory tract  computational fluid dynamics (CFD)  airflow  numerical simulation
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Author NameAffiliation
LIU Lijuan Department of Respiratory MedicineBeijing Electric Power Hospital Affiliated to Capital Medical University 
SUO Wenchao Department of Aeronautical Mechanical EngineeringArmy Aviation Institute 
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Chinese abstract:
      目的 应用计算流体动力学(computational fluid dynamics, CFD)技术对急性呼吸窘迫综合征(acute respiratory distress syndrome,ARDS)患者不同程度呼吸窘迫状态时下呼吸道内气流运动特性进行模拟研究。方法 基于CT影像数据建立真实健康人体下呼吸道三维模型。采用标准k-ε湍流模型对下呼吸道内的气体流动进行数值模拟,分析下呼吸道内气流的速度、流量、压力以及壁面剪切应力等参数分布特点。结果 拟合下呼吸道空气流动阻力与呼吸强度的函数关系;得到下呼吸道内空气流速、压力、壁面剪切应力的分布特点以及空气流量在各肺及各叶支气管的分配情况。结论 通过CFD模拟分析可以获得更为详细的下呼吸道流场相关数据,为ARDS患者的临床治疗提供理论依据。
English abstract:
      Objective To study the airflow characteristics in lower respiratory tract of acute respiratory distress syndrome (ARDS) patients with different degrees of respiratory distress by using computational fluid dynamics (CFD) technology. Methods Three-dimensional model of lower respiratory tract from a healthy subject was established based on CT image data. Standard k-ε turbulence model was used to simulate the airflow in lower respiratory tract, and the distribution characteristics of air velocity, airflow rate, air pressure and wall shear stress (WSS) in lower respiratory tract were analyzed. Results The function relationship between the pressure drop of airflow in lower respiratory tract and the respiratory intensity was fitted. The distribution characteristics of air velocity, air pressure and WSS in lower respiratory tract were obtained, and the airflow distributions in the lungs and the bronchi of each lobe were also obtained. Conclusions More detailed data of lower respiratory airflow field can be obtained by CFD simulation analysis, which provides the theoretical basis for clinical treatment of ARDS patients.
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