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BioMed Research International
Volume 2017 (2017), Article ID 7023078, 10 pages
https://doi.org/10.1155/2017/7023078
Research Article

Fluid-Structure Interaction in Abdominal Aortic Aneurysm: Effect of Modeling Techniques

1School of Civil Engineering and Architecture, Xiamen University of Technology, Xiamen, China
2Department of Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588-0656, USA
3Department of Interventional Radiology, The First Affiliated Hospital, Zhengzhou University, Henan Province, China
4Nebraska Center for Materials and Nanoscience, Lincoln, NE 68588-0656, USA

Correspondence should be addressed to Linxia Gu; ude.lnu@2ugl

Received 10 October 2016; Revised 7 December 2016; Accepted 15 January 2017; Published 22 February 2017

Academic Editor: Jifu Tan

Copyright © 2017 Shengmao Lin et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In this work, the impact of modeling techniques on predicting the mechanical behaviors of abdominal aortic aneurysm (AAA) is systematically investigated. The fluid-structure interaction (FSI) model for simultaneously capturing the transient interaction between blood flow dynamics and wall mechanics was compared with its simplified techniques, that is, computational fluid dynamics (CFD) or computational solid stress (CSS) model. Results demonstrated that CFD exhibited relatively smaller vortexes and tends to overestimate the fluid wall shear stress, compared to FSI. On the contrary, the minimal differences in wall stresses and deformation were observed between FSI and CSS models. Furthermore, it was found that the accuracy of CSS prediction depends on the applied pressure profile for the aneurysm sac. A large pressure drop across AAA usually led to the underestimation of wall stresses and thus the AAA rupture. Moreover, the assumed isotropic AAA wall properties, compared to the anisotropic one, will aggravate the difference between the simplified models with the FSI approach. The present work demonstrated the importance of modeling techniques on predicting the blood flow dynamics and wall mechanics of the AAA, which could guide the selection of appropriate modeling technique for significant clinical implications.