Flow analysis trhough an arteriovenous fistula obtained from computaed tomography
Fabio Cesar Miranda de Oliveira1; Kleiber Lima de Bessa1; Jose Ubiragi Mendes de Lima1; Ricardo Wagner da Costa Moreira1
1 Universidade Federal do Rio Grande do Norte
doi:10.20906/CPS/COB-2015-0848
Resumo
The arteriovenous fistula (AVF) is the prefered vascular access for hemodialysis, but vascular complications like thrombosis, aneurism and intimal hyperplasia often occur. Recirculation zones, stagnation points, secondary flow and low and high shear stress are the main causes of these complications. In this work is used computational fluid dynamics (CFD) for analyze the blood flow dynamics and understand better the influence of biomechanical forces in the development of vascular complications. A end-to-end AVF geometry model is provided from computerized tomography images which allowed generate a three-dimensional mesh for numerical analysis of blood flow. The velocity inlet was inserted as input boundary conditions and pressure outlet was inserted as output boundary conditions. The streamlines shows flow separation near of the anastomosis and the values of wall shear stress are different along the AVF.
Palavras-chave: arteriovenous fistula; shear stress; CFD; recirculation zone