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Linear stability of...
Linear stability of the flow in a toroidal pipe
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- Canton, Jacopo (författare)
- KTH,Mekanik,Linné Flow Center, FLOW,SeRC - Swedish e-Science Research Centre
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- Schlatter, Philipp (författare)
- KTH,Linné Flow Center, FLOW,SeRC - Swedish e-Science Research Centre,Mekanik
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- Örlü, Ramis, 1977- (författare)
- KTH,Linné Flow Center, FLOW,Strömningsfysik,Competence Center for Gas Exchange (CCGEx),SeRC - Swedish e-Science Research Centre
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(creator_code:org_t)
- TSFP-9, 2015
- 2015
- Engelska.
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Ingår i: 9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015. - : TSFP-9. - 9780000000002
- Relaterad länk:
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https://urn.kb.se/re...
Abstract
Ämnesord
Stäng
- While hydrodynamic stability and transition to turbulence in straight pipes - being one of the most fundamental problems in fluid mechanics - has been studied extensively, the stability of curved pipes has received less attention. In the present work, the first (linear) instability of the canonical flow inside a toroidal pipe is investigated as a first step in the study of the related laminar-turbulent transition process. The impact of the curvature of the pipe, in the range 8 e [0.002,1], on the stability properties of the flow is studied in the framework of linear stability analysis. Results show that the flow is indeed modally unstable for all curvatures investigated and that the wave number corresponding to the critical mode depends on the curvature, as do several other features of this problem. The critical modes are mainly located in the region of the Dean vortices, and are characterised by oscillations which are symmetric or antisymmetric as a function of the curvature. The neutral curve associated with the first bifurcation is the result of a complex interaction between isolated modes and branches composed by several modes characterised by a common structure. This behaviour is in obvious contrast to that of straight pipes, which are linearly stable for all Reynolds numbers.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)
Nyckelord
- Fluid mechanics
- Linear stability analysis
- Pipe
- Reynolds number
- Stability
- Turbulence
- Common structures
- Critical modes
- Hydrodynamic stability
- Isolated modes
- Laminar turbulent transitions
- Linear Stability
- Stability properties
- Transition to turbulence
- Shear flow
Publikations- och innehållstyp
- ref (ämneskategori)
- kon (ämneskategori)
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