DSpace DSpace UPC
 Català   Castellano   English  

E-prints UPC >
Altres >
Enviament des de DRAC >

Empreu aquest identificador per citar o enllaçar aquest ítem: http://hdl.handle.net/2117/12047

Arxiu Descripció MidaFormat
S0022112010004131a.pdf1,05 MBAdobe PDFThumbnail
Veure/Obrir

Citació: Pacheco, J.; López, J.M.; Marques, F. Pinning of rotating waves to defects in finite Taylor-Couette flow. "Journal of fluid mechanics", 10 Gener 2011, vol. 666, p. 254-272.
Títol: Pinning of rotating waves to defects in finite Taylor-Couette flow
Autor: Pacheco, J. R.; López, J. M.; Marqués Truyol, Francisco Veure Producció científica UPC
Data: 10-gen-2011
Tipus de document: Article
Resum: Experiments in small aspect-ratio Taylor–Couette flows have reported the presence of a band in parameter space where rotating waves become steady non-axisymmetric solutions (a pinning effect) via infinite-period bifurcations. Previous numerical simulations were unable to reproduce these observations. Recent additional experiments suggest that the pinning effect is not intrinsic to the dynamics of the problem, but rather is an extrinsic response induced by the presence of imperfections. Here we present numerical simulations that include a small tilt of one of the endwalls, simulating the effects of imperfections that break the SO(2) axisymmetry of the problem, and indeed are able to reproduce the experimentally observed pinning of the rotating waves. Dynamical systems considerations suggest that any imperfection breaking the SO(2) axisymmetry of the problem must result in the formation of a pinning region of finite width. We have also found that the particulars of the pinning process, in particular the width of the pinning region, are extremely sensitive to the type of imperfection in the system. Almost identical flows respond in completely different ways to the same imperfection, depending on subtle differences in the weak secondary characteristics of the flow. The numerical simulations of the Navier–Stokes equations for the problem with an imposed tilt of an endwall together with normal-form analysis of a Hopf bifurcation subjected to imposed symmetry-breaking help shed some light on previous experiments that reported a variety of different dynamical behaviour for which a clear explanation was lacking.
ISSN: 0022-1120
URI: http://hdl.handle.net/2117/12047
DOI: 10.1017/S0022112010004131
Versió de l'editor: http://journals.cambridge.org/download.php?file=%2FFLM%2FFLM666%2FS0022112010004131a.pdf&code=8d3457d66487c8ca9a5cdd4ecca8b84c
Apareix a les col·leccions:Altres. Enviament des de DRAC
DF - Dinàmica No Lineal de Fluids. Articles de revista
Departament de Física Aplicada. Articles de revista
Comparteix:


Stats Mostra les estadístiques d'aquest ítem

SFX Query

Aquest ítem (excepte textos i imatges no creats per l'autor) està subjecte a una llicència de Creative Commons Llicència Creative Commons
Creative Commons

 

Valid XHTML 1.0! Programari DSpace Copyright © 2002-2004 MIT and Hewlett-Packard Comentaris
Universitat Politècnica de Catalunya. Servei de Biblioteques, Publicacions i Arxius