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Author(s): Alexandre M. Afonso
Manuel A. Alves
Fernando T. Pinho
Paulo J. Oliveira
Title: Application of the log-conformation tensor to three-dimensional time-dependent free surface flows
Issue Date: 2007
Abstract: A finite-volume method is applied to the numerical simulation of creeping flows ofviscoelastic fluids through a 4:1 square-square three dimensional abrupt contraction. Thecalculation of the polymer stress contribution is carried out with the log-conformationmethodology [1]. The log-conformation scheme allowed converged solutions at higherDeborah numbers for the Oldroyd-B fluid than the standard method when imposing steadyflow conditions, but not for the UCM model. This does not mean that the log-conformationtechnique is less effective for the UCM fluid, but suggests that this flow is most probablytime-dependent above a critical Deborah number. In any case, this work confirms theadvantages of the log-conformation approach vis-a-vis the standard procedure.
Subject: Ciências da engenharia e tecnologias
Engineering and technology
Scientific areas: Ciências da engenharia e tecnologias
Engineering and technology
Source: Métodos Numéricos e Computacionais em Engenharia
Document Type: Artigo em Livro de Atas de Conferência Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Livro de Atas de Conferência Internacional

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