Eventos Anais de eventos
ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
Stabilized finite element method on the flow of yield stress fluids
Submission Author:
Natan Alexandre de Oliveira , RS , Brazil
Co-Authors:
Natan Alexandre de Oliveira, Guilherme Henrique Fiorot, Sergio Frey
Presenter: Natan Alexandre de Oliveira
doi://10.26678/ABCM.ENCIT2022.CIT22-0720
Abstract
Elasto-viscoplastic materials are applied in several significant applications. The viscoplastic behavior is associated with a yield stress limit that allows the presence of unyielded regions on the flow, where the stress became less than the material yield stress and the material does not flow creating unyielded regions. This work addresses numerical simulations considering the external flow of an elasto-viscoplastic material around an immerse blade. The mechanical model is made-up of the usual mass and momentum balance equations for incompressible, inertial, and steady flows. The Oldroyd-B viscoelastic equation coupled with a transport equation for the material microstructure is considered to allow elasticity, shear-thinning, and yield stress behavior. The model is approximated by a three-field stabilized Galerkin least-squares variational method, in terms of pressure, velocity and extra-stress, via bilinear finite elements. Preliminary numerical simulations are focused on the influence of inertia on the morphology of unyielded regions over the blade of an elasto-viscoplastic material.
Keywords
elasto-viscoplastic, FEM, Immerse blade, Microstructure, yield-stress materials
