Structural changes of laminar separation bubbles induced by global linear instability

Rodríguez Álvarez, Daniel and 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.

Description

Title: Structural changes of laminar separation bubbles induced by global linear instability
Author/s:
  • Rodríguez Álvarez, Daniel
  • Theofilis, Vassilios
Item Type: Article
Título de Revista/Publicación: Journal of Fluid Mechanics
Date: December 2010
ISSN: 0022-1120
Volume: 655
Subjects:
Faculty: E.T.S.I. Aeronáuticos (UPM)
Department: Motopropulsión y Termofluidodinámica [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

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.

More information

Item ID: 7671
DC Identifier: http://oa.upm.es/7671/
OAI Identifier: oai:oa.upm.es:7671
DOI: 10.1017/S0022112010000856
Official URL: http://www.jfm.damtp.cam.ac.uk/
Deposited by: Memoria Investigacion
Deposited on: 21 Jun 2011 12:06
Last Modified: 20 Apr 2016 16:45
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