Verificação numérica dos resultados assintóticos do escoamento viscoelástico Giesekus para o problema da contração 4:1
DOI:
https://doi.org/10.5540/03.2022.009.01.0327Keywords:
Contração 4, 1 Escoamento Viscoelástico, Giesekus, Análise Assintótica, SingularidadesAbstract
Neste trabalho verificamos numericamente o comportamento assintótico do tensor polimérico Tp ∼ r−0.2796 para o fluido viscoelástico Giesekus em uma contração 4:1. Além da usual formulação Cartesiana (CSF), também usamos a formulação natural do tensor (NSF), indicada para escoamentos com singularidade. Desta forma, também verificamos o comportamento assintótico das variáveis naturais λ ∼ r−1.3686 , μ ∼ r0.0 e ν ∼ r1.3686 . Estas verificações justificam-se pela necessidade de se estabelecer uma relação entre o conhecimento assintótico e numérico para escoamentos de fluidos complexos, visando a melhoria dos métodos numéricos para este tipo de escoamento.
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