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Physics of Fluids : Coherent flow states in a square duct

By Håkan Wedin, Damien Biau, Alessandro Bottaro, and Masato Nagata

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Book Id: WPLBN0002169607
Format Type: PDF eBook :
File Size: Serial Publication
Reproduction Date: 25 September 2008

Title: Physics of Fluids : Coherent flow states in a square duct  
Author: Håkan Wedin, Damien Biau, Alessandro Bottaro, and Masato Nagata
Volume: Issue : September 2008
Language: English
Subject: Science, Physics, Natural Science
Collections: Periodicals: Journal and Magazine Collection, Physics of Fluids Collection
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Publisher: American Institute of Physics

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Damien Biau, Alessandro Bottaro, And Masato Nagat, H. W. (n.d.). Physics of Fluids : Coherent flow states in a square duct. Retrieved from http://worldebookfair.com/


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Description: The flow in a square duct is considered. Finite amplitude approximate traveling wave solutions, obtained using the self-sustaining-process approach introduced by Waleffe [Phys. Fluids 9, 883 (1997) ], are obtained at low to moderate Reynolds numbers and used as initial conditions in direct numerical simulations. The ensuing dynamics is analyzed in a suitably defined phase space. Only one among the traveling wave solutions found is capable of surviving for a long time, with the flow trajectory forming quasiregular loops in phase space. Eventually, also this trajectory escapes along the manifold of a chaotic saddle and relaminarization ensues.

 

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