Dynamique des Fluides (DynFluid): Recent submissions

Now showing items 281-287 of 295

    • The onset of three-dimensional centrifugal global modes and their nonlinear development in a recirculating flow over a flat surface 
      Article dans une revue avec comité de lecture
      CHERUBINI, Stefania; DE PALMA, Pietro; ALIZARD, Frédéric; ccROBINET, Jean-Christophe (American Institute of Physics, 2010)
      The three-dimensional stability dynamics of a separation bubble over a flat plate has been studied in both linear and nonlinear conditions. Using a global eigenvalue analysis, two centrifugal global modes are identified: ...
    • Rapid path to transition via nonlinear localized optimal perturbations in a boundary-layer flow 
      Article dans une revue avec comité de lecture
      CHERUBINI, Stefania; DE PALMA, Pietro; BOTTARO, Alessandro; ccROBINET, Jean-Christophe (American Physical Society (APS), 2010)
      Recent studies have suggested that in some cases transition can be triggered by some purely nonlinear mechanisms. Here we aim at verifying such an hypothesis, looking for a localized perturbation able to lead a boundary-layer ...
    • Airfoil Shape Optimization for Transonic Flows of Bethe–Zel’dovich–Thompson Fluids 
      Article dans une revue avec comité de lecture
      CONGEDO, Pietro; CORRE, Christophe; CINNELLA, Paola (American Institute of Aeronautics and Astronautics, 2007)
      High-performance airfoils for transonic flows of Bethe–Zel’dovich–Thompson fluids are constructed using a robust and efficient Euler flow solver coupled with a multi-objective genetic algorithm. Bethe–Zel’dovich– Thompson ...
    • Optimal wave packets in a boundary layer and initial phases of a turbulent spot 
      Article dans une revue avec comité de lecture
      CHERUBINI, Stefania; BOTTARO, Alessandro; DE PALMA, Pietro; ccROBINET, Jean-Christophe (Cambridge University Press (CUP), 2010)
      The three-dimensional global optimal dynamics of a flat-plate boundary layer is studied by means of an adjoint-based optimization in a spatial domain of long – but finite – streamwise dimension. The localized optimal initial ...
    • Nonlinear optimal perturbations in a Couette flow: bursting and transition 
      Article dans une revue avec comité de lecture
      CHERUBINI, Stefania; DE PALMA, Pietro (Cambridge University Press (CUP), 2013)
      This paper provides the analysis of bursting and transition to turbulence in a Couette flow, based on the growth of nonlinear optimal disturbances. We use a global variational procedure to identify such optimal disturbances, ...
    • Edge states in a boundary layer 
      Article dans une revue avec comité de lecture
      CHERUBINI, Stefania; DE PALMA, Pietro; BOTTARO, Alessandro; ccROBINET, Jean-Christophe (American Institute of Physics, 2011)
      The understanding of laminar-turbulent transition in shear flows has recently progressed along new paradigms based on the central role of nonlinear exact coherent states. We follow such paradigms to identify, for the first ...
    • The minimal seed of turbulent transition in the boundary layer 
      Article dans une revue avec comité de lecture
      CHERUBINI, Stefania; DE PALMA, Pietro; BOTTARO, Alessandro; ccROBINET, Jean-Christophe (Cambridge University Press (CUP), 2011)
      This paper describes a scenario of transition from laminar to turbulent flow in a spatially developing boundary layer over a flat plate. The base flow is the Blasius non-parallel flow solution; it is perturbed by optimal ...