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Simulations at a newly derived reference model of the human lung

机译:在新推导的人肺参考模型上的仿真

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Based on an in-vitro preparation of an adult human lung combined with high-resolution tomography we developed a realistic graph representation of the bronchial tree of a particular human lung. The graph contains topological information about spatial coordinates, connectivities, diameters and branching angles of 1453 bronchi up to the 17th Horsfield order, and is characterized by asymmetric and multifractal properties. This geometrical model was the basis for the development of an unstructured, multiphase CFD model of the trachea and upper airways. This is directly relevant to research in that intricate anatomical system geometries are employed. Based on medical imaging data CFD modeling associated with complex moving geometries, multi-phase/multi-species physics, and turbulence is incorporated. We contrast this approach with the use of mass-transport equations that describe the gas transport axially. Results show that many of the transport processes within the airways depend quite sensitively on the geometry of the bronchial bifurcations and the structure of the boundaries.
机译:基于成人肺的体外制备与高分辨率断层扫描相结合,我们开发了特定人肺的支气管树的逼真的图形表示。该图包含有关直到17th Horsfield阶的1453支气管的空间坐标,连通性,直径和分支角的拓扑信息,并且具有不对称和多重分形特性。该几何模型是开发气管和上呼吸道非结构化多相CFD模型的基础。这与采用复杂的解剖系统几何结构的研究直接相关。基于医学成像数据,将CFD建模与复杂的运动几何,多相/多物种物理学和湍流相关联。我们将这种方法与描述轴向气体传输的质量传输方程式进行对比。结果表明,气道内的许多运输过程非常敏感地取决于支气管分叉的几何形状和边界的结构。

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