• Edge state in pipe flow experiments 

      De Lozar, Alberto; Mellibovsky Elstein, Fernando; Avila, M.; Hof, Björn (2012-05-21)
      Article
      Accés obert
      Recent numerical studies suggest that in pipe and related shear flows, the region of phase space separating laminar from turbulent motion is organized by a chaotic attractor, called an edge state, which mediates the ...
    • Exceeding the asymptotic limit of polymer drag reduction 

      Choueiri, George; López Alonso, José Manuel; Hof, Björn (American Institute of Physics (AIP), 2018-03-19)
      Article
      Accés obert
      The drag of turbulent flows can be drastically decreased by adding small amounts of high molecular weight polymers. While drag reduction initially increases with polymer concentration, it eventually saturates to what is ...
    • Experimental observation of the origin and structure of elastoinertial turbulence 

      Choueiri, George; López Alonso, José Manuel; Varshney, Atul; Sankar, Sarath; Hof, Björn (2021-11-09)
      Article
      Accés obert
      Turbulence generally arises in shear flows if velocities and hence, inertial forces are sufficiently large. In striking contrast, viscoelastic fluids can exhibit disordered motion even at vanishing inertia. Intermediate ...
    • Invariant solutions organizing pipe flow turbulence 

      Altmeyer, Sebastian Andreas; Hof, Björn (American Physical Society (APS), 2017)
      Text en actes de congrés
      Accés obert
    • Streamwise-localized solutions at the onset of turbulence in pipe flow 

      Àvila Cañellas, Marc; Mellibovsky Elstein, Fernando; Roland, N.; Hof, Björn (2013-05)
      Article
      Accés obert
      Although the equations governing fluid flow are well known, there are no analytical expressions that describe the complexity of turbulent motion. A recent proposition is that in analogy to low dimensional chaotic systems, ...