Examining mesh independence for flow dynamics in the human nasal cavity

Inthavong, K, Chetty, A, Shang, Y and Tu, J 2018, 'Examining mesh independence for flow dynamics in the human nasal cavity', Computers in Biology and Medicine, vol. 102, pp. 40-50.

Document type: Journal Article
Collection: Journal Articles

Title Examining mesh independence for flow dynamics in the human nasal cavity
Author(s) Inthavong, K
Chetty, A
Shang, Y
Tu, J
Year 2018
Journal name Computers in Biology and Medicine
Volume number 102
Start page 40
End page 50
Total pages 11
Publisher Pergamon Press
Abstract Increased computational resources provide new opportunities to explore sophisticated respiratory modelling. A survey of recent publications showed a steady increase in the number of mesh elements used in computational models over time. Complex geometries such as the nasal cavity exhibit sharp gradients and irregular curvatures, leading to abnormal flow development across their surfaces. As such, a robust method for examining the near-wall mesh resolution is required. The non-dimensional wall unit y+ (often used in turbulent flows) was used as a parameter to evaluate the near-wall mesh in laminar flows. Mesh independence analysis from line profiles showed that the line location had a significant influence on the result. Furthermore, using a single line profile as a measure for mesh convergence was unsuitable for representing the entire flow field. To improve this, a two-dimensional (2D) cross-sectional plane subtraction method where scalar values (such as the velocity magnitude) on a cross-sectional plane were interpolated onto a regularly spaced grid was proposed. The new interpolated grid values from any two meshed models could then be compared for changes caused by the different meshed models. The application of this method to three-dimensional (3D) volume subtraction was also demonstrated. The results showed that if the near-wall mesh was sufficiently refined, then narrow passages were less reliant on the overall mesh size. However, in wider passages, velocity magnitudes were sensitive to mesh size, requiring a more refined mesh.
Subject Numerical Modelling and Mechanical Characterisation
DOI - identifier 10.1016/j.compbiomed.2018.09.010
Copyright notice © 2018 Elsevier Ltd.
ISSN 0010-4825
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