Experiments in Fluids

, 54:1580 | Cite as

Identification strategies for model-based control

  • Laurent Cordier
  • Bernd R. Noack
  • Gilles Tissot
  • Guillaume Lehnasch
  • Joël Delville
  • Maciej Balajewicz
  • Guillaume Daviller
  • Robert K. Niven
Research Article
Part of the following topical collections:
  1. Topics in Flow Control


A reduced-order modelling (ROM) strategy is crucial to achieve model-based control in a wide class of flow configurations. In turbulence, ROMs are mostly derived by Galerkin projection of first-principles equations onto the proper orthogonal decomposition (POD) modes. These POD ROMs are known to be relatively fragile when used for control design. To understand more deeply this behaviour, a hierarchy of POD ROMs is studied and compared for a two-dimensional uncontrolled mixing layer. First, dynamical models based on POD are derived from the Navier–Stokes and the vorticity equations. It is shown that these models can exhibit for some truncation level finite-time blow-ups. A symmetrized quadratic model is then proposed to enforce the preservation of energy in the model. This formulation improves considerably the behaviour of the model, but the energy level is still overestimated. Subsequently, a nonlinear eddy-viscosity model with guaranteed stability is proposed. This model still leads to an imperfect description of the energy. Different 4D-Var identification strategies are then considered to improve the nonlinear eddy-viscosity model. It is shown that penalizing the time variation in the eddy-viscosity parameter leads to the best compromise in terms of description of the energy and of physical relevance of the eddy viscosity. Lastly, a statistical inference procedure is used to take into account the bias inherent of the sampling employed in the identification procedure. Joined probability density functions are then determined empirically for all the coefficients of the model, and a stochastic dynamical model is finally derived to study the influence on the long-term solution of different equiprobable sets of coefficients.



This work has received support from the National Agency for Research on references ANR-08-BLAN-0115-01 (CORMORED) and ANR-10-CEXC-015-01 (Chair of Excellence TUCOROM). BRN also acknowledges the University of New South Wales at the Australian Defense Force Academy for a Rector-Funded Visiting Fellowship.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Laurent Cordier
    • 1
  • Bernd R. Noack
    • 1
  • Gilles Tissot
    • 1
  • Guillaume Lehnasch
    • 1
  • Joël Delville
    • 1
  • Maciej Balajewicz
    • 2
  • Guillaume Daviller
    • 1
  • Robert K. Niven
    • 3
  1. 1.Institut Pprime, CNRS – Université de Poitiers – ENSMA, UPR 3346, Département Fluides, Thermique, Combustion, CEATPoitiers CedexFrance
  2. 2.Mechanical Engineering and Materials SciencesDuke UniversityDurhamUSA
  3. 3.School of Engineering and Information TechnologyThe University of New South Wales at ADFACanberraAustralia

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