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• W2030477042 startingPage "317" @default.
• W2030477042 abstract "In simulating biofluid flow domains, structured hexahedral meshes are often associated with high quality solutions. However, extensive time and effort are required to generate these meshes for complex branching geometries. This study evaluates potential mesh configurations that may maintain the advantages of the structured hexahedral style while providing significant savings in grid construction time and complexity. Specifically, the objective of this study is to evaluate the performance of unstructured hexahedral, prismatic and hybrid meshes based on grid convergence and local particle deposition fractions in a bifurcating model of the respiratory tract. A grid convergence index (GCI) has been implemented to assess the mesh-independence of solutions in cases where true grid halving is not feasible. Localized and total deposition values have been evaluated for particles ranging from 1 through 10 μm in planar and out-of-plane geometries. Structured hexahedral, unstructured hexahedral and prismatic meshes were found to provide GCI values of approximately 5% and nearly identical velocity fields. In contrast, the hexahedral–tetrahedral hybrid model resulted in GCI values that were significantly higher in comparison to the other meshes. The resulting velocity field for the hybrid configuration differed from the hexahedral and prismatic solutions by up to an order of magnitude at some locations. Considering the deposition of 10 μm particles in the planar configuration, all meshes considered provided relatively close agreement (2–20% difference) with an available experimental study. For all particle sizes considered, local and total deposition results for the structured and unstructured hexahedral meshes were similar. In contrast, the prismatic and hybrid geometries resulted in significantly higher deposition rates when compared to the hexahedral meshes for particles less than 10 μm. As a result, only the unstructured hexahedral mesh was found to provide overall performance similar to the structured hexahedral configuration with the advantage of a significant savings in construction time. These results emphasize the importance of aligning control volume gridlines with the predominant flow direction in biofluid applications that involve long and thin internal flow domains. Future studies are needed to assess other forms of the hybrid configuration and the effects of other element styles." @default.
• W2030477042 created "2016-06-24" @default.
• W2030477042 creator A5037822615 @default.
• W2030477042 creator A5045981743 @default.
• W2030477042 date "2008-03-01" @default.
• W2030477042 modified "2023-09-26" @default.
• W2030477042 title "Evaluation of hexahedral, prismatic and hybrid mesh styles for simulating respiratory aerosol dynamics" @default.
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• W2030477042 doi "https://doi.org/10.1016/j.compfluid.2007.05.001" @default.
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