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- W2117408149 abstract "This paper is concerned with coupled problems in the human respiratory system with emphasis on mechanical ventilation. We focus on the modeling aspects of pulmonary alveoli and the lower airways against the background of acute lung diseases. In this connection occurring stresses and strains are of substantial interest. For the first generations of the bronchial tree, a geometry based on human computer tomography scans obtained from in-vivo experiments is employed. The deformability of airway walls is taken into account to study airflow structures and airway wall stresses for a number of different scenarios. Therefore we carried out fluid-structure interaction (FSI) simulations under transient incompressible flow conditions. Both models for healthy and diseased lungs are studied under normal breathing as well as under mechanical ventilation. Our alveolar model is based on three-dimensional artificial random geometries generated with the help of a new labyrinthine algorithm ensuring preservation of overall minimal mean pathlength. A polyconvex hyperelastic material model incorporating general histologic information is employed to realistically describe alveolar parenchymal tissue properties. The influence of surface-active agents (the so-called surfactant) on the overall mechanical behavior of pulmonary alveoli is investigated. For this purpose an adsorption-limited model relating surface stresses to the interfacial concentration of surfactant is used." @default.
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- W2117408149 date "2008-01-01" @default.
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- W2117408149 title "Towards stresses and strains in the respiratory system" @default.
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- W2117408149 doi "https://doi.org/10.1051/proc:082307" @default.
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