Three-dimensional finite volume modelling of blood flow in simulated angular neck abdominal aortic aneurysm

Algabri, Yousif A.; Rookkapan, Sorracha; Chatpun, Surapong

doi:10.1088/1757-899x/243/1/012003

Cited by 10 publications

(11 citation statements)

References 12 publications

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“…not cross over streamlines) within the aneurysm sac with a very small region of recirculation [45]. It also showed that the velocity flow within the aorta was observed to have vorticity flow and recirculation particularly through the aneurysm sac and aortic bifurcation, and these findings are consistent with idealized and real geometries in prior studies [31,43,44,46], but our study reveals more complex recirculation and vorticity due to highly angulated neck and complexity of patient specific AAA geometry. Furthermore, a larger diameter for ruptured AAAs was associated with greater recirculation flow whereas less recirculation was found in smaller ruptured AAAs [47].…”

Section: Discussionsupporting

confidence: 88%

“…The three-dimensional geometry of angular neck AAA was reconstructed from computed tomography images. More specifically, the impact of high angular neck AAA on blood flow and wall shear stress (WSS) were assessed for an angle (> 60); particularly important due to the lack of studies in this area [22], where previous studies focused on smaller proximal angles (≤60) or using idealized geometries [6,17,22,43,44].…”

Section: Discussionmentioning

confidence: 99%

“…In this study, the presence of a bending angle greater than 60 caused high flow turbulence and irregularities of blood-flow streamlines. This indicates that WSS and their distribution will be altered, with potential impact on weakening of arteries wall [43,44].…”

Section: Discussionmentioning

confidence: 99%

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Computational study on hemodynamic changes in patient-specific proximal neck angulation of abdominal aortic aneurysm with time-varying velocity

Algabri

Rookkapan

Gramigna

et al. 2019

Australas Phys Eng Sci Med

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Aneurysms are considered as a critical cardiovascular disease worldwide when they rupture. The clinical understanding of geometrical impact on the flow behaviour and biomechanics of abdominal aortic aneurysm (AAA) is progressively developing. Proximal neck angulations of AAAs are believed to influence the hemodynamic changes and wall shear stress (WSS) within AAAs. Our aim was to perform pulsatile simulations using computational fluid dynamics (CFD) for patient-specific geometry to investigate the influence of severe angular (≥ 60) neck on AAA's hemodynamic and wall shear stress. The patient's geometrical characteristics were obtained from a computed tomography images database of AAA patients. The AAA geometry was reconstructed using Mimics software. In computational method, blood was assumed Newtonian fluid and an inlet varying velocity waveform in a cardiac cycle was assigned. The CFD study was performed with ANSYS software. The results of flow behaviours indicated that the blood flow through severe bending of angular neck leads to high turbulence and asymmetry of flows within the aneurysm sac resulting in blood recirculation. The high wall shear stress (WSS) occurred near the AAA neck and on surface of aneurysm sac. This study explained and showed flow behaviours and WSS progression within high angular neck AAA and risk prediction of abdominal aorta rupture. We expect that the visualization of blood flow and hemodynamic changes resulted from CFD simulation could be as an extra tool to assist clinicians during a decision making when estimation the risks of interventional procedures.

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Section: Discussionsupporting

confidence: 88%

Section: Discussionmentioning

confidence: 99%

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Computational study on hemodynamic changes in patient-specific proximal neck angulation of abdominal aortic aneurysm with time-varying velocity

Algabri

Rookkapan

Gramigna

et al. 2019

Australas Phys Eng Sci Med

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“…The velocities profile obtained from this study closely resembles those obtained by Algabri et al 6 There is a great similarity in the inflow velocity and the average velocity from both studies, with a 19% and 9% difference, respectively. Both studies suggest a strong correlation between the degrees of angular neck AAA, and the pattern of the blood flow through the aorta.…”

Section: Discussionsupporting

confidence: 87%

“…Finally, the parameters of the model were based on Algabri’s 6 review “Three-dimensional finite volume modeling of blood flow in simulated angular neck abdominal aortic aneurysm,” such as the angle (60 degrees), inlet diameter (20 mm), aneurysm diameter size of an average risk rupture (>50 mm), length (65 mm), proximal diameter (20 mm), maximum diameter (55 mm), iliac artery diameter (outlet) (10-15 mm). Furthermore, the simulation setup, the flow assumptions, the hematocrit percentage values, were also taken from this review.…”

Section: Methodsmentioning

confidence: 99%

3D Modeling of Blood Flow in Simulated Abdominal Aortic Aneurysm

González-Urquijo

Zamacona

Mendoza

et al. 2021

Vasc Endovascular Surg

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Background: Besides biological factors, abdominal aortic aneurysm rupture is also caused by mechanical parameters, which are constantly affecting the wall’s tissue due to their abnormal values. The ability to evaluate these parameters could vastly improve the clinical treatment of patients with abdominal aortic aneurysms. The objective of this study was to develop and demonstrate a methodology to analyze the fluid dynamics that cause the wall stress distribution in abdominal aortic aneurysms, using accurate 3D geometry and a realistic, nonlinear, elastic biomechanical model using a computer-aided software. Methods: The geometry of the abdominal aortic aneurysm; was constructed on a 3D scale using computer-aided software SolidWorks (Dassault Systems SolidWorksCorp., Waltham MA). Due to the complex nature of the abdominal aortic aneurysm geometry, the physiological forces and constraints acting on the abdominal aortic aneurysm wall were measured by using a simulation setup using boundary conditions and initial conditions for different studies such as finite element analysis or computational fluid dynamics. Results: The flow pattern showed an increase velocity at the angular neck, followed by a stagnated flow inside the aneurysm sack. Furthermore, the wall shear stress analysis showed to focalized points of higher stress, the top and bottom of the aneurysm sack, where the flow collides against the wall. An increase of the viscosity showed no significant velocity changed but results in a slight increase in overall pressure and wall shear stress. Conclusions: Conducting computational fluid dynamics modeling of the abdominal aortic aneurysm using computer-aided software SolidWorks (Dassault Systems SolidWorksCorp., Waltham MA) proves to be an insightful approach for the clinical setting. The careful consideration of the biomechanics of the abdominal aortic aneurysm may lead to an improved, case-specific prediction of the abdominal aortic aneurysm rupture potential, which could significantly improve the clinical management of these patients.

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Visualization of Blood Flow in AAA Patient-Specific Geometry: 3-D Reconstruction and Simulation Procedures

2019

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Three-dimensional finite volume modelling of blood flow in simulated angular neck abdominal aortic aneurysm

Cited by 10 publications

References 12 publications

Computational study on hemodynamic changes in patient-specific proximal neck angulation of abdominal aortic aneurysm with time-varying velocity

Computational study on hemodynamic changes in patient-specific proximal neck angulation of abdominal aortic aneurysm with time-varying velocity

3D Modeling of Blood Flow in Simulated Abdominal Aortic Aneurysm

Visualization of Blood Flow in AAA Patient-Specific Geometry: 3-D Reconstruction and Simulation Procedures

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