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Linear stability Analysis of Viscoelastic Flows
KTH, School of Engineering Sciences (SCI), Mechanics.
2012 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Linjär stabilitet-analys av viskoelastiska flöden (Swedish)
Abstract [en]

The goal of present work is to investigate the instability of jet ow, mixing layer and Poiseuille ow of viscoelastic uids. According to Boeta et al: [4], small elastic eect in Kolmogorov ow will result in increasing critical Re for hydrodynamic instability, however, at high elasticity a new instability of elastic nature occurs even at vanishing Re. This thesis aims to test this result in jet and mixing layer. In addition, linear stability analysis (modal and non-modal) of viscoelastic Poiseuille ow is carried out to understand the elastic eects on the ows of both Oldroyd-B and FENE-P model uids. Energy analysis is used to reveal the instability mechanism.

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Engineering and Technology
URN: urn:nbn:se:kth:diva-95137OAI: diva2:526641
Available from: 2012-05-14 Created: 2012-05-14 Last updated: 2012-05-14Bibliographically approved

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