Observatorio de I+D+i UPM

Memorias de investigación
Research Project:
COTURB: Coherent Structures in Wall-bounded Turbulence
Year:2016
Research Areas
Information
Abstract

Turbulence is a multiscale phenomenon for which control efforts have often failed because the dimension of the attractor is large. However, kinetic energy and drag are controlled by relatively few slowly evolving large structures that sit on top of a multiscale cascade of smaller eddies. They are essentially single-scale phenomena whose evolution can be described using less information than for the full flow. In evolutionary terms they are punctuated `equilibria¿ for which chaotic evolution is only intermittent. The rest of the time they can be considered coherent and predictable for relatively long periods. Coherent structures studied in the 1970s in free-shear flows (e.g. jets) eventually led to increased understanding and to industrial applications. In wall-bounded cases (e.g. boundary layers), proposed structures range from exact permanent waves and orbits to qualitative observations such as hairpins or ejections. Although most of them have been described at low Reynolds numbers, there are reasons to believe that they persist at higher ones in the `LES¿ sense in which small scales are treated statistically. Recent computational and experimental advances provide enough temporally and spatially resolved data to quantify the relevance of such models to fully developed flows. We propose to use mostly existing numerical data bases to test the various models of wall-bounded coherent structures, to quantify how often and how closely the flow approaches them, and to develop moderate-time predictions. Existing solutions will be extended to the LES equations, methods will be sought to identify them in fully turbulent flows, and reduced-order models will be developed and tested. In practical situations, the idea is to be able to detect large eddies and to predict them `most of the time¿. If simple enough models are found, the process will be implemented in the laboratory and used to suggest control strategies.

International
Si
Project type
Proyectos y convenios en convocatorias públicas competitivas
Company
Entity Nationality
Sin nacionalidad
Entity size
Granting date
13/07/2015
Participants
  • Participante: Alberto Vela Martin (UPM)
  • Participante: Patricia Lahoz Moreno (UPM)
  • Participante: Marcos Casas Alonso (UPM)
  • Participante: Agustí Esteban Marugán (UPM)
  • Participante: Adrián García Gutierrez (UPM)
  • Director: Javier Jimenez Sendin (UPM)
  • Participante: Miguel Angel Flores Caballero (UPM)
  • Participante: Manuel Carreño Ruiz (UPM)
  • Participante: Yongseok Kwon . (UPM)
  • Participante: José Ignacio Cardesa Dueñas (UPM)
  • Participante: Miguel Perez Encinar (UPM)
Research Group, Departaments and Institutes related
  • Departamento: Mecánica de Fluidos y Propulsión Aeroespacial
S2i 2019 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
Cofinanciación del MINECO en el marco del Programa INNPACTO (IPT-020000-2010-22)