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Memorias de investigación
Ponencias en congresos:
Finite-Element Numerical Methods for BiGlobal Linear Instability Analysis of Vortical Flows
Año:2007
Áreas de investigación
  • Mecánica de fluidos
Datos
Descripción
Highly resolved, accurate solutions of the two-dimensional incompressible Navier-Stokes and continuity equations, describing the evolution of a counter-rotating pair of vortices, have been obtained efficiently by spectral collocation and an eigenvalue decomposition algorithm. Such solutions have formed the basic state for subsequent three-dimensional BiGlobal eigenvalue problem (EVP) linear instability analyses, which monitor the modal response of the vortical systems to small-amplitude perturbations along the homogeneous axial spatial direction, without the need to invoke an assumption of azimuthal spatial homogeneity. A finite-element methodology (FEM) has been adapted to study instability of vortical flows and has been validated on the Batchelor vortex. Subsequently, instability of the counter-rotating pair of vortices obtained previously has been analyzed; essential to the success of the analysis has been the appropriate design of a calculation mesh, as well as exploitation of the symmetries of the basic state. The spatial structure of the amplitude functions of all unstable eigenmodes reflects the inhomogeneity of the basic state in the azimuthal spatial direction, thus providing a-posteriori justification for the use of the BiGlobal EVP concept.
Internacional
Si
Nombre congreso
AIAA Paper 2007-4359, 37th AIAA Fluid Dynamics Conference and Exhibit
Tipo de participación
960
Lugar del congreso
Miami, FL, USA
Revisores
Si
ISBN o ISSN
ISBN-10: 1-56347-897
DOI
Fecha inicio congreso
25/06/2007
Fecha fin congreso
28/06/2007
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Título de las actas
Esta actividad pertenece a memorias de investigación
Participantes
  • Autor: LEO GONZÁLEZ (UPM School of Naval Engineering)
  • Autor: Vassilios Theofilis (UPM)
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Mecánica de Fluidos Computacional
  • Departamento: Motopropulsión y Termofluidodinámica
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