title: Computational fluid dynamics in abdominal aorta bifurcation: non-Newtonian versus Newtonian blood flow in a real case study.
abstract: Hemodynamic in abdominal aorta bifurcation was investigated in a real case using computational fluid dynamics. A Newtonian and non-Newtonian (Walburn-Schneck) viscosity models were compared. The geometrical model was obtained by 3D reconstruction from CT-scan and hemodynamic parameters obtained by laser-Doppler. Blood was assumed incompressible fluid, laminar flow in transient regime and rigid vessel wall. Finite volume-based was used to study the velocity, pressure, wall shear stress (WSS) and viscosity throughout cardiac cycle. Results obtained with Walburn-Schneck's model, during systole, present lower viscosity due to shear thinning behavior. Furthermore, there is a significant difference between the results obtained by the two models for a specific patient. During the systole, differences are more pronounced and are preferably located in the tortuous regions of the artery. Throughout the cardiac cycle, the WSS amplitude between the systole and diastole is greater for the Walburn-Schneck's model than for the Newtonian model. However, the average viscosity along the artery is always greater for the non-Newtonian model, except in the systolic peak. The hemodynamic model is crucial to validate results obtained with CFD and to explore clinical potential.
authors.affiliation: a ECT/UTAD - School of Science and Technology , University of Trás-os-Montes e Alto Douro , Vila Real , Portugal.|b CIENER-INEGI - Institute of Science and Innovation in Mechanical and Industrial Engineering , Porto , Portugal.
authors.forename: Armando A
authors.initials: AA
authors.lastname: Soares
authors.affiliation: b CIENER-INEGI - Institute of Science and Innovation in Mechanical and Industrial Engineering , Porto , Portugal.
authors.forename: Sílvia
authors.initials: S
authors.lastname: Gonzaga
authors.affiliation: a ECT/UTAD - School of Science and Technology , University of Trás-os-Montes e Alto Douro , Vila Real , Portugal.
authors.forename: Carlos
authors.initials: C
authors.lastname: Oliveira
authors.affiliation: c Hospital Centre Lisboa Norte, Hospital de Santa Maria e Hospital Pulido Valente , Lisbon , Portugal.
authors.forename: André
authors.initials: A
authors.lastname: Simões
authors.affiliation: a ECT/UTAD - School of Science and Technology , University of Trás-os-Montes e Alto Douro , Vila Real , Portugal.|b CIENER-INEGI - Institute of Science and Innovation in Mechanical and Industrial Engineering , Porto , Portugal.|d Department of Mechanical Engineering and Applied Mechanics , University of Pennsylvania (UPENN) , Philadelphia , PA , USA.
authors.forename: Abel I
authors.initials: AI
authors.lastname: Rouboa
mesh_terms: D001012:Aorta, Abdominal / Q000502:physiology*; D001783:Blood Flow Velocity / Q000502:physiology; D001809:Blood Viscosity; D006801:Humans; D057446:Hydrodynamics; D008955:Models, Cardiovascular; D011312:Pressure; D012039:Regional Blood Flow / Q000502:physiology; D015203:Reproducibility of Results; D013314:Stress, Mechanical; D013997:Time Factors
keywords: Aorta bifurcation; Walburn-Schneck’s viscosity; computational fluid dynamics; hemodynamic; wall shear stress