Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
SOME NUMERICAL SIMULATIONS OF COMPLEX FLUID FLOWS
Submission Author:
Sergio Frey , RS , Brazil
Co-Authors:
Fernanda Link, Monica Naccache, Paulo Roberto de Souza Mendes, Giovanni Furtado, Roney Thompson
Presenter: Sergio Frey
doi://10.26678/ABCM.ENCIT2016.CIT2016-0685
Abstract
Some numerical results of thixotropic elasto-viscoplastic flows are presented in this paper. The thixotropic model makes use of the usual governing equations for incompressible material coupled with a modified Oldroyd-B equation, in which the relation and retardation times and the viscoplastic function are depended on rheology. Such a model is approximated by a four-field stabilized finite element method in terms of the structure parameter, extra-stress, pressure and velocity. Simulations focus on determination of position and shape of flow unyielded regions, along with pressure, velocity and extra stress distributions in a lid-driven cavity and a sudden expansion. Results indicate a strong interlace between elasticity and yield stress on yield surfaces topology.
Keywords
Thixotropy, Elasticity, Viscoplastic material, Complex flows, Galerkin least-squares method, Thixotropy, Elasticity, Viscoplastic material, Complex flows, Galerkin least-squares method, Thixotropy, Elasticity, Viscoplastic material, Complex flows, Galerkin least-squares method
