The study of oscillatory flow pattern and flow-wall interaction in human pulmonary system

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The study of oscillatory flow pattern and flow-wall interaction in human pulmonary system

 

Author: Peng, Yun
Title: The study of oscillatory flow pattern and flow-wall interaction in human pulmonary system
Degree: M.Sc.
Year: 2011
Subject: High-frequency ventilation (Therapy).
Airway(Medicine) -- Tomography.
Respiratory system.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Mechanical Engineering
Pages: xii, 182 p. : ill. (some col.) ; 30 cm.
InnoPac Record: http://library.polyu.edu.hk/record=b2445332
URI: http://theses.lib.polyu.edu.hk/handle/200/6144
Abstract: In this study, the high frequency oscillatory ventilation was numerically investigated using the CFD software FLUENT. Further, the effect of noises in the HFOV was investigated. Firstly, a 2D numerical model of human upper respiratory system with boundary conditions of HFOV inlet boundary was built and meshed using the CAD software Gambit. Then the dynamic meshing for the oscillatory wall motions was added in FLUENT and the cases were carried out for Re=500. After calculation, the velocity distribution at the inlet, outlet and middle part of the airway was investigated and the shear stress in axial and vertical directions was studied. The results showed that counter-flow coexisted in the airway and the shear stress took a pattern of amplitude modulation. Then noises with different magnitudes were added to the inlet flow. The effect of noise on the HFOV was investigated mainly focused on the discussion of shear stress and the existence of Stochastic Resonance. The noise affected the shear stress in axial and vertical directions differently, although no strong evidence of stochastic resonance was found.

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