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Detecting instabilities in flows of viscoelastic fluids

✍ Scribed by N. Fiétier

Publisher
John Wiley and Sons
Year
2003
Tongue
English
Weight
307 KB
Volume
42
Category
Article
ISSN
0271-2091

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✦ Synopsis

Abstract

There is a growing interest in developing numerical tools to investigate the onset of physical instabilities observed in experiments involving viscoelastic flows, which is a difficult and challenging task as the simulations are very sensitive to numerical instabilities. Following a recent linear stability analysis carried out in order to better understand qualitatively the origin of numerical instabilities occurring in the simulation of flows viscoelastic fluids, the present paper considers a possible extension for more complex flows. This promising method could be applied to track instabilities in complex (i.e. essentially non‐parallel) flows. In addition, results related to transient growth mechanism indicate that it might be responsible for the development of numerical instabilities in the simulation of viscoelastic fluids. Copyright © 2003 John Wiley & Sons, Ltd.

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THE CONVECTIVE AND ABSOLUTE INSTABILITY
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✍ K.S. Yeo; B.C. Khoo; H.Z. Zhao 📂 Article 📅 1999 🏛 Elsevier Science 🌐 English ⚖ 262 KB

The occurrence of waves on viscoelastic compliant layers subject to ¯uid ¯ow is studied from the viewpoint of their classi®cation as convective and absolute instability of the ¯ow-wall system. Uniform potential ¯ow and modi®ed potential ¯ows representing laminar and turbulent boundary layers are con