On instability and structural sensitivity of incompressible laminar separation bubbles in a flat-plate boundary layer

Rodriguez, Daniel and Theofilis, Vassilios (2008). On instability and structural sensitivity of incompressible laminar separation bubbles in a flat-plate boundary layer. In: "38th Fluid Dynamics Conference and Exhibit, (AIAA)", 23/06/2008-26/06/2008, Seattle, EE UU.

Description

Title: On instability and structural sensitivity of incompressible laminar separation bubbles in a flat-plate boundary layer
Author/s:
  • Rodriguez, Daniel
  • Theofilis, Vassilios
Item Type: Presentation at Congress or Conference (Article)
Event Title: 38th Fluid Dynamics Conference and Exhibit, (AIAA)
Event Dates: 23/06/2008-26/06/2008
Event Location: Seattle, EE UU
Title of Book: Proceedings of 38th Fluid Dynamics Conference and Exhibit, (AIAA)
Date: 2008
Subjects:
Faculty: E.T.S.I. Aeronáuticos (UPM)
Department: Motopropulsión y Termofluidodinámica [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

Full text

[img] PDF - Users in campus UPM only - Requires a PDF viewer, such as GSview, Xpdf or Adobe Acrobat Reader
Download (734kB)

Abstract

The separation of the laminar boundary layer under an adverse pressure gradient and its subsequent turbulent re-attachment, forming what is known as a "laminar separation bubble", is a technological problem of primary significance, with applications in aircraft wings, turbine blades and wind turbines. Despite extensive studies during the last century, many questions related to the appearance, structure and instability properties of laminar separation bubbles, still remain open. Some of these questions are first referred to in the works of Gault,1 and McCullough and Gault,2, 3 in which separation bubbles are classified according to their stream wise extension as \short" or \long". Tani4 indicated classification conditions but it was not until Gaster5 that a universal classification criterion was proposed, based on the free stream velocity, Us, the momentum thickness at separation, Os, and the ensuing momentum-thickness Reynolds number, Res .Following this classification, several investigators have proposed analogous criteria;6{8 however, the physical origin of a classification is not fully understood, and a generally accepted threshold for the change from one kind of bubble to the other does not exist presently.

More information

Item ID: 4265
DC Identifier: http://oa.upm.es/4265/
OAI Identifier: oai:oa.upm.es:4265
Official URL: http://www.aiaa.org/index.cfm
Deposited by: Memoria Investigacion
Deposited on: 27 Sep 2010 08:23
Last Modified: 22 Sep 2014 10:14
  • Logo InvestigaM (UPM)
  • Logo GEOUP4
  • Logo Open Access
  • Open Access
  • Logo Sherpa/Romeo
    Check whether the anglo-saxon journal in which you have published an article allows you to also publish it under open access.
  • Logo Dulcinea
    Check whether the spanish journal in which you have published an article allows you to also publish it under open access.
  • Logo de Recolecta
  • Logo del Observatorio I+D+i UPM
  • Logo de OpenCourseWare UPM