Structural changes of laminar separation bubbles induced by global linear instability

Rodríguez Álvarez, Daniel y Theofilis, Vassilios (2010). Structural changes of laminar separation bubbles induced by global linear instability. "Journal of Fluid Mechanics", v. 655 ; pp. 280-305. ISSN 0022-1120. https://doi.org/10.1017/S0022112010000856.

Descripción

Título: Structural changes of laminar separation bubbles induced by global linear instability
Autor/es:
  • Rodríguez Álvarez, Daniel
  • Theofilis, Vassilios
Tipo de Documento: Artículo
Título de Revista/Publicación: Journal of Fluid Mechanics
Fecha: Diciembre 2010
Volumen: 655
Materias:
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

The topology of the composite flow fields reconstructed by linear superposition of a two-dimensional boundary layer flow with an embedded laminar separation bubble and its leading three-dimensional global eigenmodes has been studied. According to critical point theory, the basic flow is structurally unstable; it is shown that in the presence of three-dimensional disturbances the degenerate basic flow topology is replaced by a fully three-dimensional pattern, regardless of the amplitude of the superposed linear perturbations. Attention has been focused on the leading stationary eigenmode of the laminar separation bubble discovered by Theofilis; the composite flow fields have been fully characterized with respect to the generation and evolution of their critical points. The stationary global mode is shown to give rise to a three-dimensional flow field which is equivalent to the classical U-shaped separation, defined by Hornung & Perry, and induces topologies on the surface streamlines that are resemblant to the characteristic stall cells observed experimentally.

Más información

ID de Registro: 7671
Identificador DC: http://oa.upm.es/7671/
Identificador OAI: oai:oa.upm.es:7671
Identificador DOI: 10.1017/S0022112010000856
URL Oficial: http://www.jfm.damtp.cam.ac.uk/
Depositado por: Memoria Investigacion
Depositado el: 21 Jun 2011 12:06
Ultima Modificación: 20 Abr 2016 16:45
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