A new numerical framework to simulate viscoelastic free-surface flows with the finite-volume method

R Comminal,J Spangenberg,J H Hattel

doi:10.1088/1742-6596/602/1/012022

Abstract

A new method for the simulation of 2D viscoelastic flow is presented. Numerical stability is obtained by the logarithmic-conformation change of variable, and a fully-implicit pure-streamfunction flow formulation, without use of any artificial diffusion. As opposed to other simulation results, our calculations predict a hydrodynamic instability in the 4:1 contraction geometry at a Weissenberg number of order 4. This new result is in qualitative agreement with the prediction of a non-linear subcritical elastic instability in Poiseuille flow. Our viscoelastic flow solver is coupled with a volume-of-fluid solver in order to predict free- surfaces in extrusion.

Highlights

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Our results suggest that a level of 5 % inulin addition leads to a production of a functional bread of high sensory acceptance and a level of 10 % inulin produces a bread of a satisfactory sensory acceptance
We show that the chaotic behavior is a result of the shear band instabilities/avalanches that arise for large strains and the convective displacement fields they create

Summary

Introduction

General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. Users may download and print one copy of any publication from the public portal for the purpose of private study or research. In L.A. Gömze (Editor) 1st International Conference on Rheology and Modeling of Materials, Miskolc-Lillafüred, Hungary, pp. Published in Hungary – Igrex Ltd, Igrici, Hungary Printed in Hungary – Passzer 2000 Ltd, Miskolc, Hungary, Technical editor: Dr István Kocserha. Organized by the International Scientific Advisory Board, by the International Organization Board and by the Session chairs

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