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Wall Shear Stress Estimation of Thoracic Aortic Aneurysm Using Computational Fluid Dynamics
Joint Authors
Febina, J.
Sikkandar, Mohamed Yacin
Sudharsan, N. M.
Source
Computational and Mathematical Methods in Medicine
Issue
Vol. 2018, Issue 2018 (31 Dec. 2018), pp.1-12, 12 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2018-06-03
Country of Publication
Egypt
No. of Pages
12
Main Subjects
Abstract EN
An attempt has been made to evaluate the effects of wall shear stress (WSS) on thoracic aortic aneurysm (TAA) using Computational Fluid Dynamics (CFD).
Aneurysm is an excessive localized swelling of the arterial wall due to many physiological factors and it may rupture causing shock or sudden death.
The existing imaging modalities such as MRI and CT assist in the visualization of anomalies in internal organs.
However, the expected dynamic behaviour of arterial bulge under stressed condition can only be effectively evaluated through mathematical modelling.
In this work, a 3D aneurysm model is reconstructed from the CT scan slices and eventually the model is imported to Star CCM+ (Siemens, USA) for intensive CFD analysis.
The domain is discretized using polyhedral mesh with prism layers to capture the weakening boundary more accurately.
When there is flow reversal in TAA as seen in the velocity vector plot, there is a chance of cell damage causing clots.
This is because of the shear created in the system due to the flow pattern.
It is observed from the proposed mathematical modelling that the deteriorating WSS is an indicator for possible rupture and its value oscillates over a cardiac cycle as well as over different stress conditions.
In this model, the vortex formation pattern and flow reversals are also captured.
The non-Newtonian model, including a pulsatile flow instead of a steady average flow, does not overpredict the WSS (15.29 Pa compared to 16 Pa for the Newtonian model).
Although in a cycle the flow behaviour is laminar-turbulent-laminar (LTL), utilizing the non-Newtonian model along with LTL model also overpredicted the WSS with a value of 20.1 Pa.
The numerical study presented here provides good insight of TAA using a systematic approach to numerical modelling and analysis.
American Psychological Association (APA)
Febina, J.& Sikkandar, Mohamed Yacin& Sudharsan, N. M.. 2018. Wall Shear Stress Estimation of Thoracic Aortic Aneurysm Using Computational Fluid Dynamics. Computational and Mathematical Methods in Medicine،Vol. 2018, no. 2018, pp.1-12.
https://search.emarefa.net/detail/BIM-1132114
Modern Language Association (MLA)
Febina, J.…[et al.]. Wall Shear Stress Estimation of Thoracic Aortic Aneurysm Using Computational Fluid Dynamics. Computational and Mathematical Methods in Medicine No. 2018 (2018), pp.1-12.
https://search.emarefa.net/detail/BIM-1132114
American Medical Association (AMA)
Febina, J.& Sikkandar, Mohamed Yacin& Sudharsan, N. M.. Wall Shear Stress Estimation of Thoracic Aortic Aneurysm Using Computational Fluid Dynamics. Computational and Mathematical Methods in Medicine. 2018. Vol. 2018, no. 2018, pp.1-12.
https://search.emarefa.net/detail/BIM-1132114
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1132114