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Article

An Effective Interface Tracking Method for Simulating the Extrudate Swell Phenomenon

1
Institute for Polymers and Composites, Department of Polymer Engineering, Campus of Azurém, University of Minho, 4800-058 Guimarães, Portugal
2
Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Ivana Lučića 5, 10000 Zagreb, Croatia
*
Author to whom correspondence should be addressed.
Academic Editor: Serge Bourbigot
Polymers 2021, 13(8), 1305; https://doi.org/10.3390/polym13081305
Received: 30 March 2021 / Revised: 10 April 2021 / Accepted: 11 April 2021 / Published: 16 April 2021
(This article belongs to the Special Issue Advanced Polymer Simulation and Processing)
The extrudate swell, i.e., the geometrical modifications that take place when the flowing material leaves the confined flow inside a channel and moves freely without the restrictions that are promoted by the walls, is a relevant phenomenon in several polymer processing techniques. For instance, in profile extrusion, the extrudate cross-section is subjected to a number of distortions that are motivated by the swell, which are very difficult to anticipate, especially for complex geometries. As happens in many industrial processes, numerical modelling might provide useful information to support design tasks, i.e., to allow for identifying the best strategy to compensate the changes promoted by the extrudate swell. This study reports the development of an improved interface tracking algorithm that employs the least-squares volume-to-point interpolation method for the grid movement. The formulation is enriched further with the consistent second-order time-accurate non-iterative Pressure-Implicit with Splitting of Operators (PISO) algorithm, which allows for efficiently simulating free-surface flows. The accuracy and robustness of the proposed solver is illustrated through the simulation of the steady planar and asymmetric extrudate swell flows of Newtonian fluids. The role of inertia on the extrudate swell is studied, and the results that are obtained with the newly improved solver show good agreement with reference data that are found in the scientific literature. View Full-Text
Keywords: extrusion; extrudate swell; interface tracking; least-squares volume-to-point interpolation; consistent PISO; finite volume method; OpenFOAM extrusion; extrudate swell; interface tracking; least-squares volume-to-point interpolation; consistent PISO; finite volume method; OpenFOAM
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MDPI and ACS Style

Fakhari, A.; Tukovic, Ž.; Carneiro, O.S.; Fernandes, C. An Effective Interface Tracking Method for Simulating the Extrudate Swell Phenomenon. Polymers 2021, 13, 1305. https://doi.org/10.3390/polym13081305

AMA Style

Fakhari A, Tukovic Ž, Carneiro OS, Fernandes C. An Effective Interface Tracking Method for Simulating the Extrudate Swell Phenomenon. Polymers. 2021; 13(8):1305. https://doi.org/10.3390/polym13081305

Chicago/Turabian Style

Fakhari, Ahmad, Željko Tukovic, Olga Sousa Carneiro, and Célio Fernandes. 2021. "An Effective Interface Tracking Method for Simulating the Extrudate Swell Phenomenon" Polymers 13, no. 8: 1305. https://doi.org/10.3390/polym13081305

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