Now showing items 1-16 of 16

  • A mechanism for streamwise localisation of nonlinear waves in shear flows 

    Mellibovsky Elstein, Fernando; Meseguer Serrano, Álvaro (2015-09-01)
    Article
    Open Access
    We present the complete unfolding of streamwise localisation in a paradigm of extended shear flows, namely two-dimensional plane Poiseuille flow. Exact solutions of the Navier-Stokes equations are computed numerically and ...
  • 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
    Restricted access - publisher's policy
    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 ...
  • Dynamics on the pipe flow critical threshold 

    Mellibovsky Elstein, Fernando; Meseguer Serrano, Álvaro (2009-07)
    Conference report
    Restricted access - publisher's policy
  • El enigma de Osborne Reynolds 

    Meseguer Serrano, Álvaro; Mellibovsky Elstein, Fernando (2010-03-01)
    Article
    Restricted access - publisher's policy
    Aunque se sigue desconociendo por qué un fl uido conducido por una tubería se vuelve turbulento, se ha dado un paso importante hacia la resolución del problema, formulado hace ya más de 125 años
  • El problema de Reynolds: transició subcrítica a la turbulència 

    Meseguer Serrano, Álvaro; Mellibovsky Elstein, Fernando (2008-12-30)
    Article
    Open Access
    Fa 125 anys, Osborne Reynolds, matemàtic i professor d’enginyeria de la Universitat de Manchester, va publicar el seu treball experimental i teòric sobre la transició a la turbulència de fluids en moviment dins de canonades. ...
  • Extensional channel flow revisited: a dynamical systems perspective 

    Marqués Truyol, Francisco; Meseguer Serrano, Álvaro; Mellibovsky Elstein, Fernando; Weidman, Patrick (2017-06-07)
    Article
    Open Access
    Extensional self-similar flows in a channel are explored numerically for arbitrary stretching–shrinking rates of the confining parallel walls. The present analysis embraces time integrations, and continuations of steady ...
  • Fold-pitchfork bifurcation for maps with Z(2) symmetry in pipe flow 

    Marqués Truyol, Francisco; Mellibovsky Elstein, Fernando; Meseguer Serrano, Álvaro (2013-07-11)
    Article
    Open Access
    This study aims to provide a better understanding of recently identified transition scenarios exhibited by traveling wave solutions in pipe flow. This particular family of solutions are invariant under certain reflectional ...
  • Instability mechanisms and transition scenarios of spiral turbulence in Taylor-Couette flow 

    Meseguer Serrano, Álvaro; Mellibovsky Elstein, Fernando; Àvila Cañellas, Marc; Marqués Truyol, Francisco (2009-10)
    Article
    Open Access
    Alternating laminar and turbulent helical bands appearing in shear flows between counterrotating cylinders are accurately computed and the near-wall instability phenomena responsible for their generation identified for the ...
  • Mode competition in cylindrical flows driven by sidewall oscillations 

    Panadès Guinart, Carles; Marqués Truyol, Francisco; Meseguer Serrano, Álvaro (2013-04)
    Article
    Open Access
    The transition from a two-dimensional to three-dimensional flow in systems with spatial O(2) symmetry and spatiotemporal Z2 symmetry happens in many fluid systems, like wakes or periodically forced flows. In most of these ...
  • MODELS MATEMÀTICS DE LA FÍSICA 

    Meseguer Serrano, Álvaro (Universitat Politècnica de Catalunya, 2017-05-30)
    Exam
    Restricted access to the UPC academic community
  • Models Matemàtics de la Física | Final 

    Meseguer Serrano, Álvaro (Universitat Politècnica de Catalunya, 2019-06-06)
    Exam
    Restricted access to the UPC academic community
  • Models Matemàtics de la Física | Parcial 

    Meseguer Serrano, Álvaro (Universitat Politècnica de Catalunya, 2019-04-04)
    Exam
    Restricted access to the UPC academic community
  • Numerical continuation in classical mechanics and thermodynamics 

    Gimenez, Aleix; chausse, victor; Meseguer Serrano, Álvaro (2015-01-01)
    Article
    Open Access
    In this paper, modern numerical continuation methodologies are presented as a way of understanding and computing multiplicity of solutions in undergraduate physics problems. Mechanical and thermodynamical problems are used ...
  • Numerical continuation in classical mechanics and thermodynamics 

    Gimenez, Aleix; Chausse, Víctor; Meseguer Serrano, Álvaro (2014-11-24)
    Article
    Restricted access - confidentiality agreement
    In this paper, modern numerical continuation methodologies are presented as a way of understanding and computing multiplicity of solutions in undergraduate physics problems. Mechanical and thermodynamical problems are used ...
  • Shear instabilities in Taylor-Couette flow 

    Meseguer Serrano, Álvaro; Mellibovsky Elstein, Fernando; Marqués Truyol, Francisco; Àvila Cañellas, Marc (Springer, 2009-09-09)
    Conference lecture
    Restricted access - publisher's policy
    Subcritical instabilities in small gap Taylor-Couette (TCF) problem are studied numerically when both cylinders rotate in opposite directions. The computations are carried out for a radius ratio A first exploration is ...
  • Subcritical equilibria in Taylor-Couette flow 

    Deguchi, Kengo; Meseguer Serrano, Álvaro; Mellibovsky Elstein, Fernando (2014-05-08)
    Article
    Open Access
    Nonlinear equilibrium states characterized by strongly localized vortex pairs are calculated in the linearly stable parameter region of counterrotating Taylor-Couette flow. These subcritical states are rotating waves whose ...