Title: Computational investigation of blood flow in fusiform models of aortic aneurysms: a steady state analysis

Authors: R. Vinoth; D. Kumar; Raviraj Adhikari; Dedeepiya Devaprasad; Dhamodharan Kaliyamoorthy

Addresses: Department of Electronics and Communication Engineering, Manipal Institute of Technology, Manipal University, Manipal, Udupi, Karnataka, India ' Department of Electronics and Communication Engineering, Periyar Maniammai University, Thanjavur, Tamil Nadu, India ' Department of Mechanical and Manufacturing Engineering, Manipal Institute of Technology, Manipal University, Manipal, Udupi, Karnataka, India ' Department of Critical Care, Apollo Hospitals, Greams Road, Chennai, Tamil Nadu, India ' Department of Cardiology, Kauvery Hospitals, Alwarpet, Chennai, Tamil Nadu, India

Abstract: Laminar, turbulent and transitional numerical simulations of steady flow in an aneurysmal aorta with different aneurysm diameters were carried out using Computational Fluid Dynamic (CFD) technique. The simulation of steady flow condition in normal aorta was also carried out to provide the data for comparison with an aneurysmal aorta data. Results were calculated for Wall Shear Stress (WSS) patterns, pressure and velocity fields from normal aorta and aneurysmal aorta models. The pressure drop values were also calculated analytically for each model to compare with numerically simulated one. The larger aneurysm models demonstrated unstable flow with greater magnitude of instability at the distal portion of aneurysm, the flow in the smaller models became stable. The results of pressure drop value show that the laminar fluid flow model is desirable for normal aorta and smaller aneurysm models, the transitional flow model is suitable for larger aneurysm models.

Keywords: CFD; computational fluid dynamics; steady state; aorta; aortic aneurysms; wall shear stress; wall pressure; velocity; blood flow; fusiform models; flow modelling; aneurysm models; numerical simulation; laminar fluid flow; transitional fluid flow; laminar flow; transitional flow.

DOI: 10.1504/IJBET.2015.071411

International Journal of Biomedical Engineering and Technology, 2015 Vol.19 No.1, pp.70 - 91

Received: 11 Dec 2014
Accepted: 23 Mar 2015
Published online: 25 Aug 2015 *

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