Biglobal linear stability analysis for the flow in eccentric annular channels and a related geometry

Merzari, Elia; Wang, Sheng; Ninokata, Hisashi y Theofilis, Vassilios (2008). Biglobal linear stability analysis for the flow in eccentric annular channels and a related geometry. "Physics of Fluids", v. 20 (n. 11); pp.. ISSN 1070-6631. https://doi.org/10.1063/1.3005864.

Descripción

Título: Biglobal linear stability analysis for the flow in eccentric annular channels and a related geometry
Autor/es:
  • Merzari, Elia
  • Wang, Sheng
  • Ninokata, Hisashi
  • Theofilis, Vassilios
Tipo de Documento: Artículo
Título de Revista/Publicación: Physics of Fluids
Fecha: Noviembre 2008
Volumen: 20
Materias:
Palabras Clave Informales: Biglobal linear stability, analysis, Poiseuille flow, laminar velocity, eccentric channels, U-shaped channel.
Escuela: E.T.S.I. Aeronáuticos (UPM) [antigua denominación]
Departamento: Motopropulsión y Termofluidodinámica [hasta 2014]
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

Recently, it has been observed that simple geometry characterized by a low level of symmetry present interesting peculiarities in the process of transition from laminar Poiseuille flow to turbulent flow. Examples of this type of geometry are eccentric channels and, more generally, parallel channels containing a narrow gap. In the present work, a global linear stability analysis for the flow in this class of geometry has been performed. The problem is discretized through spectral collocation and the eigenvalue problem has been solved with the Arnoldi-method based algorithms and the QZ algorithm. Since no numerical studies of this type have yet been performed to address the issue of transition in this geometry, the codes have been validated toward results obtained in simplified geometries _e.g., concentric annular channel and square channel_. The eigenvalue spectra of the Poiseuille flow in eccentric channels and a U-shaped channel have then been computed and analyzed for a wide range of geometric parameters. After comparison with spectra typical of channel flow and pipe flow it is shown that an additional linear mechanism of instability is present, related to the spanwise variation of the laminar velocity profile.

Más información

ID de Registro: 2293
Identificador DC: http://oa.upm.es/2293/
Identificador OAI: oai:oa.upm.es:2293
Identificador DOI: 10.1063/1.3005864
URL Oficial: http://pof.aip.org/phfle6/v20/i11
Depositado por: Memoria Investigacion
Depositado el: 20 May 2010 08:59
Ultima Modificación: 20 Abr 2016 12:02
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