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Memorias de investigación
Artículos en revistas:
Three-dimensional instability analysis of boundary layers perturbed by streamwise vortices
Año:2016
Áreas de investigación
  • Mecánica de fluidos,
  • Ingeniería aeronaútica,
  • Fluidos dinámicos computacionales
Datos
Descripción
A parametric study is presented for the incompressible, zero-pressure-gradient flat-plate boundary layer perturbed by streamwise vortices. The vortices are placed near the leading edge and model the vortices induced by miniature vortex generators (MVGs), which consist in a spanwise-periodic array of small winglet pairs. The introduction ofMVGs has been experimentally proved to be a successful passive flowcontrol strategy for delaying laminar-turbulent transition caused by Tollmien?Schlichting (TS) waves. The counter-rotating vortex pairs induce non-modal, transient growth that leads to a streaky boundary layer flow. The initial intensity of the vortices and their wall-normal distances to the plate wall are varied with the aim of finding the most effective location for streak generation and the effect on the instability characteristics of the perturbed flow. The study includes the solution of the three-dimensional, stationary, streaky boundary layer flows by using the boundary region equations, and the three-dimensional instability analysis of the resulting basic flows by using the plane-marching parabolized stability equations. Depending on the initial circulation and positioning of the vortices, planar TS waves are stabilized by the presence of the streaks, resulting in a reduction in the region of instability and shrink of the neutral stability curve. For a fixed maximum streak amplitude below the threshold for secondary instability (SI), the most effective wall-normal distance for the formation of the streaks is found to also offer the most stabilization of TS waves. By setting a maximum streak mplitude above the threshold for SI, sinuous shear layer modes become unstable, as well as another instability mode that is amplified in a narrow region near the vortex inlet position.
Internacional
Si
JCR del ISI
Si
Título de la revista
Theoretical And Computational Fluid Dynamics
ISSN
0935-4964
Factor de impacto JCR
1,321
Información de impacto
Datos JCR del año 2015
Volumen
DOI
Número de revista
Desde la página
1
Hasta la página
13
Mes
SIN MES
Ranking
Esta actividad pertenece a memorias de investigación
Participantes
  • Autor: Juan Angel Martin Bautista (UPM)
  • Autor: Pedro Paredes Gonzalez (UPM)
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Departamento: Matemática Aplicada a la Ingeniería Aeroespacial
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