Comput Math Methods Med - CFD modelling of abdominal aortic aneurysm on hemodynamic loads using a realistic geometry with CT.

Tópicos

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Resumo

The objective of this study is to find a correlation between the abdominal aortic aneurysm (AAA) geometric parameters, wall stress shear (WSS), abdominal flow patterns, intraluminal thrombus (ILT), and AAA arterial wall rupture using computational fluid dynamics (CFD). Real AAA 3D models were created by three-dimensional (3D) reconstruction of in vivo acquired computed tomography (CT) images from 5 patients. Based on 3D AAA models, high quality volume meshes were created using an optimal tetrahedral aspect ratio for the whole domain. In order to quantify the WSS and the recirculation inside the AAA, a 3D CFD using finite elements analysis was used. The CFD computation was performed assuming that the arterial wall is rigid and the blood is considered a homogeneous Newtonian fluid with a density of 1050kg/m(3) and a kinematic viscosity of 4 ? 10(-3) Pa?s. Parallelization procedures were used in order to increase the performance of the CFD calculations. A relation between AAA geometric parameters (asymmetry index ( ? ), saccular index ( ), deformation diameter ratio ( ), and tortuosity index ( e )) and hemodynamic loads was observed, and it could be used as a potential predictor of AAA arterial wall rupture and potential ILT formation.

Resumo Limpo

object studi find correl abdomin aortic aneurysm aaa geometr paramet wall stress shear wss abdomin flow pattern intralumin thrombus ilt aaa arteri wall ruptur use comput fluid dynam cfd real aaa d model creat threedimension d reconstruct vivo acquir comput tomographi ct imag patient base d aaa model high qualiti volum mesh creat use optim tetrahedr aspect ratio whole domain order quantifi wss recircul insid aaa d cfd use finit element analysi use cfd comput perform assum arteri wall rigid blood consid homogen newtonian fluid densiti kgm kinemat viscos pas parallel procedur use order increas perform cfd calcul relat aaa geometr paramet asymmetri index saccular index deform diamet ratio tortuos index e hemodynam load observ use potenti predictor aaa arteri wall ruptur potenti ilt format

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