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구강암 절제 및 재건 수술에 따른 기도 내 공기 유동 시뮬레이션
서희림(Heerim Seo),송재민(Jae Min Song),염은섭(Eunseop Yeom) 한국가시화정보학회 2020 한국가시화정보학회지 Vol.18 No.3
Oral cancer surgery changes the morphologic characteristics of the human upper airway. These changes can affect the flow patterns. In this study, computational fluid dynamics (CFD) simulations with transient solver were performed to numerically investigate the air flows in the human upper airways depending oral cancer surgery. 3D reconstructed models were obtained from 2D CT images of one patient. For the boundary condition, the realistic breathing cycle of human was applied. The hydraulic diameters of cross-sections for post-surgical model are changed greatly along streamwise direction, so these variations can cause higher wall shear stress and flow disturbance compared to pre-surgical model. The recirculation flows observed in the protruding region result in the relatively large pressure drop. These results can be helpful to understand the flow variations after resection surgery of oral cancer.
PIV 측정 및 수치해석을 이용한 구강암 수술에 따른 기도 형상 내 유동 특성
홍현지(Hyeonji Hong),안세현(Se Hyeon An),서희림(Heerim Seo),송재민(Jae Min Song),염은섭(Eunseop Yeom) 한국가시화정보학회 2021 한국가시화정보학회지 Vol.19 No.3
Oral cancer surgery typically consists of resection of lesion, neck dissection and reconstruction, and it has an impact on the position of hyoid bone. Therefore, morphological change of airway can occur since the geometric parameter of airway is correlated with the hyoid bone. Airflow is affected by geometry of the airway. In this study, flow characteristics were compared between pre- and post-surgery models by both particle image velocimetry (PIV) and numerical simulation. 3D model of upper airway was reconstructed based on CT data. Velocity is accelerated by the reduced channel area, and vortex and recirculation region are observed in pre- and post-surgery models. For the post-surgery model, high pressure distribution is developed by significantly decreased hydraulic diameter, and the longitudinal flow stream is also interrupted.