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An Effective Interface Tracking Method for Simulating the Extrudate Swell Phenomenon.

Ahmad Fakhari1, Željko Tukovic2, Olga Sousa Carneiro1

  • 1Institute for Polymers and Composites, Department of Polymer Engineering, Campus of Azurém, University of Minho, 4800-058 Guimarães, Portugal.

Polymers
|April 30, 2021
PubMed
Summary
This summary is machine-generated.

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This study introduces an improved numerical solver for simulating extrudate swell in polymer processing. The new method accurately predicts geometrical changes, aiding in the design of polymer extrusion processes.

Area of Science:

  • Polymer Science and Engineering
  • Computational Fluid Dynamics
  • Materials Processing

Background:

  • Extrudate swell, a key phenomenon in polymer processing, causes distortions difficult to predict, especially in complex geometries.
  • Accurate numerical modeling is crucial for designing polymer processing techniques and compensating for extrudate swell.
  • Existing methods struggle with anticipating extrudate swell distortions in profile extrusion.

Purpose of the Study:

  • To develop an improved interface tracking algorithm for simulating extrudate swell.
  • To enhance numerical modeling capabilities for polymer processing design tasks.
  • To accurately predict geometrical modifications during polymer flow.

Main Methods:

  • Developed an improved interface tracking algorithm using least-squares volume-to-point interpolation for grid movement.
Keywords:
OpenFOAMconsistent PISOextrudate swellextrusionfinite volume methodinterface trackingleast-squares volume-to-point interpolation

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  • Integrated a consistent second-order time-accurate non-iterative Pressure-Implicit with Splitting of Operators (PISO) algorithm.
  • Simulated steady planar and asymmetric extrudate swell flows of Newtonian fluids.

    • Main Results:

    • The developed solver accurately simulates extrudate swell phenomena.
    • The study investigated the influence of inertia on extrudate swell.
    • Results showed good agreement with existing scientific literature data.

    Conclusions:

    • The improved solver offers a robust and accurate tool for simulating free-surface flows in polymer processing.
    • This advancement aids in anticipating and compensating for extrudate swell distortions.
    • The numerical model supports design optimization in polymer extrusion processes.