• Arrow-shaped elasto-inertial rotating waves 

      López Alonso, José Manuel; Altmeyer, Sebastian Andreas (Royal Society, 2023-05-01)
      Article
      Accés obert
      We present direct numerical simulations of the Taylor–Couette flow of a dilute polymer solution when only the inner cylinder rotates and the curvature of the system is moderate (¿=0.77 ). The finitely extensible nonlinear ...
    • Bifurcations with imperfect SO(2) symmetry and pinning of rotating waves 

      Marqués Truyol, Francisco; Meseguer Serrano, Álvaro; Lopez, Juan M.; Pacheco, Jose Rafael; López Alonso, José Manuel (2013-04-08)
      Article
      Accés restringit per política de l'editorial
      Rotating waves are periodic solutions in SO(2) equivariant dynamical systems. Their precession frequency changes with parameters and it may change sign, passing through zero. When this happens, the dynamical system is very ...
    • Cuantificación de mácula patológica en retinopatía diabética mediante estadística de color 

      Igalla El Youssfi, Asmae; López Alonso, José Manuel (Universitat Politècnica de Catalunya, 2022-07-01)
      Comunicació de congrés
      Accés obert
      La retinopatía diabética en su afección macular suele cursar con cambios, tanto en la claridad como en el croma, de la imagen de la retina. A partir del estudio de imágenes de la retina con el espacio de color YCbCr se ...
    • Dynamics of axially localized states in Taylor-Couette flows 

      López Alonso, José Manuel; Marqués Truyol, Francisco (2015-05-15)
      Article
      Accés obert
      We present numerical simulations of the flow confined in a wide gap Taylor-Couette system, with a rotating inner cylinder and variable length-to-gap aspect ratio. A complex experimental bifurcation scenario differing from ...
    • 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 ...
    • Numerical modeling of simple laboratory experiments of rotating flows 

      López Alonso, José Manuel (Universitat Politècnica de Catalunya, 2015-02-05)
      Tesi
      Accés obert
      Despite the large amount of research which has been conducted on turbulent flows, a full understanding of their dynamics as well as the mechanisms involved in the onset of turbulence is still missing. Experimental studies ...
    • Stably stratified Taylor-Couette flows 

      López Alonso, José Manuel; Lopez, Juan M; Marqués Truyol, Francisco (2023-05-01)
      Article
      Accés obert
      Stably stratified Taylor–Couette flow has attracted much attention due to its relevance as a canonical example of the interplay among rotation, stable stratification, shear and container boundaries, as well as its potential ...
    • Vortex merging and splitting events in viscoelastic Taylor-Couette flow 

      López Alonso, José Manuel (2022-09-10)
      Article
      Accés obert
      Recent experiments have reported a novel transition to elasto-inertial turbulence in the Taylor–Couette flow of a dilute polymer solution. Unlike previously reported transitions, this newly discovered scenario, dubbed ...