Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
COMPARISON OF DIFERENT RHEOLOGICAL MODELS FOR COMPUTATIONAL SIMULATION OF BLOOD FLOW IN CENTRAL VENOUS ACESS
Submission Author:
Saulo Gonçalves , MG
Co-Authors:
Saulo Gonçalves, Thabata Lucas, Jonathas Haniel, Rudolf Huebner, Edna Maria de Faria Viana, Mário Silva
Presenter: Saulo Gonçalves
doi://10.26678/ABCM.COBEM2019.COB2019-0459
Abstract
Numerical models based on Computational fluid dynamics allow the investigation of hemodynamic factors that lead to thrombus formation and progression. When simulating blood flow, physical modeling of its viscosity is a point of uncertainty. Although blood tends to behave as a non-Newtonian fluid in the venous circulation, it is possible that the insertion of a catheter into the jugular veins, during hemodialysis procedure, leads to higher strain rates, making blood behaves as a Newtonian fluid. This study propose the development of a computational model to simulate blood flow in central venous access and to compare different rheological models commonly used in numerical simulations to represent blood viscosity. The software ANSYS-Fluent® 19.2 was used to perform simulations in transient regime comprising a total time of one cardiac cycle. Different rheological models commonly used for blood viscosity, as Carreau-Yasuda and Power-Law models, were preformed and compared with the Newtonian model, reveling significant differences in regions with lower strain rates, closed to the exit of the vein to the right atrium. It was also found that, in many parts of the physical domain, blood behave as a Newtonian fluid along almost all the duration of a cardiac cycle. Only at the contraction of the right atrium, at t = 0,3s, blood seems to behave, predominantly, as a non-Newtonian fluid along almost all the physical domain.
Keywords
CFD, Fluid Mechanics and Rheology - Computational Fluid Dynamics, Blood flow, Hemodynamic, Blood rheology
