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This work investigates the instability of recirculation bubbles formed in a non-Newtonian fluid from the Giesekus model using a global eigenmode stability analysis. The objective is to relate the parameters that control the viscoelastic contribution with characteristics of the recirculation bubble that can be decisive in the emergence of instabilities and to investigate the influence of the non-Newtonian contribution on the hydrodynamic stability of these flows.

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Stability Analysis of Recirculation Bubble Flow in a Viscoelastic Fluid

  • 会议论文

  • 发表日期：

    2026年

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  • Beatriz L. Carreira,
  • Elmer M. Gennaro,
  • Daniel Rodríguez,
  • Leandro F. Souza

摘要

This work investigates the instability of recirculation bubbles formed in a non-Newtonian fluid from the Giesekus model using a global eigenmode stability analysis. The objective is to relate the parameters that control the viscoelastic contribution with characteristics of the recirculation bubble that can be decisive in the emergence of instabilities and to investigate the influence of the non-Newtonian contribution on the hydrodynamic stability of these flows.