Aproximações estabilizadas de escoamentos de fluidos viscoplásticos através de uma expansão seguida de uma contração axissimétrica

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

2012

RESUMO

The effect of inertia in the flow of viscoplastic fluids through an expansion followed by a contraction is analyzed. The mechanical behavior is modeled by the Generalized Newtonian Fluid constitutive equation, with the viscosity function given by the SMD equation (de Souza Mendes and Dutra, 2004). The conservation equations of mass and momentum, together with the constitutive equation are approximated by a Galerkin least-squares (GLS) formulation in terms of pressure and velocity. A sensitivity analysis is performed, aiming at investigating the influence of inertia and viscous forces on the fluid dynamics. The topology of yield surfaces is obtained, and proved to be strongly related to inertia and yield stress amounts considered in the flow. Moreover, the results are compared to other results from the literature, which consider fluid elasticity. It is observed that inertia and elasticity effects lead to different flow patterns.

ASSUNTO(S)

mecanica dos fluidos metodos numericos viscoplasticidade

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