Blar i forfatter "Haller, George"

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    • Interplay between advective, diffusive and active barriers in (rotating) Rayleigh-Bénard flow 

      Aksamit, Nikolas Olson; Hartmann, Robert; Lohse, Detlef; Haller, George (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-08-22)
      Our understanding of the material organization of complex fluid flows has benefited recently from mathematical developments in the theory of objective coherent structures. These methods have provided a wealth of approaches that identify transport barriers in three-dimensional (3-D) turbulent flows. Specifically, theoretical advances have been incorporated into numerical algorithms that extract ...

    • Objective Momentum Barriers in Wall Turbulence 

      Aksamit, Nikolas Olson; Haller, George (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-04-28)
      We use the recent frame-indifferent theory of diffusive momentum transport to identify internal barriers in wall-bounded turbulence. Formed by the invariant manifolds of the Laplacian of the velocity field, the barriers block the viscous part of the instantaneous momentum flux in the flow. We employ the level sets of single-trajectory Lagrangian diagnostic tools, the trajectory rotation average ...