Document Detail


Transition in localized pipe flow turbulence.
MedLine Citation:
PMID:  19792506     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
Direct numerical simulation of transitional pipe flow is carried out in a long computational domain in order to characterize the dynamics within the saddle region of phase space that separates laminar flow from turbulent intermittency. For Reynolds numbers ranging from Re=1800 to 2800, a shoot and bisection method is used to compute critical trajectories. The chaotic saddle or edge state approached by these trajectories is studied in detail. For Re< or =2000 the edge state and the corresponding intermittent puff are shown to share similar averaged global properties. For Re> or =2200, the puff length grows unboundedly whereas the edge state varies only little with Re. In this regime, transition is shown to proceed in two steps: first the energy grows to produce a localized turbulent patch, which then, during the second stage, spreads out to fill the pipe.
Authors:
Fernando Mellibovsky; Alvaro Meseguer; Tobias M Schneider; Bruno Eckhardt
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Publication Detail:
Type:  Journal Article     Date:  2009-07-31
Journal Detail:
Title:  Physical review letters     Volume:  103     ISSN:  0031-9007     ISO Abbreviation:  Phys. Rev. Lett.     Publication Date:  2009 Jul 
Date Detail:
Created Date:  2009-10-01     Completed Date:  2009-10-13     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0401141     Medline TA:  Phys Rev Lett     Country:  United States    
Other Details:
Languages:  eng     Pagination:  054502     Citation Subset:  -    
Affiliation:
Departament de Física Aplicada, Universitat Politècnica de Catalunya, 08034, Barcelona, Spain.
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