Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
Stabilized Finite Element Approximations for Shear-thinning Viscoelastic Flows
Submission Author:
Natan Alexandre de Oliveira , RS , Brazil
Co-Authors:
Natan Alexandre de Oliveira, Vitor Dal Bo Abella, Sergio Frey
Presenter: Natan Alexandre de Oliveira
doi://10.26678/ABCM.COBEM2019.COB2019-2297
Abstract
Viscoelastic fluids are present in several industrial applications in nature. The current work aims at investigating viscoelastic flows in complex flows, in particular through a sudden contraction with a variable aspect ratio. The mechanical model is made-up of conservation equations of mass and momentum for incompressible materials, coupled with a modified upper convected Maxwell–type equation that accommodates the shear-thinning of viscosity. The model is via a three-field Galerkin least-squares–like method in extra stress, velocity, and pressure. Computations focus on the evaluation of the influence of elasticity, kinematics, power-law, and geometry. That is obtained by the ranging in inappropriate intervals, of the Weissenberg number, the flow rate, the power coefficient, and the aspect ration of the contraction. Numerical results make clear that elasticity and geometry alter the viscoelastic flow pattern profoundly.
Keywords
Viscoelastic, White-Metzner equation, shear-thinning, stabilized finite element, Sudden Contraction
