Now showing items 1-20 of 26

  • An exactly solvable model in P.R.M.: quantization. II 

    Iranzo Fernández, Vicente; Llosa, J; Marqués Truyol, Francisco; Molina, A (1984-01)
    Article
    Open Access
    The quantization of a priori hamiltonian predictive systems is studied. It is applied to quantize the family of N-particle relativistic models presented in ref. 1. The relativistic two-particle oscillator is studied in ...
  • 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 ...
  • Conductive and convective heat transfer in fluid flows between differentially heated and rotating cylinders 

    López, José M.; Marqués Truyol, Francisco; Àvila Cañellas, Marc (2015-11-01)
    Article
    Open Access
    The flow of fluid confined between a heated rotating cylinder and a cooled stationary cylinder is a canonical experiment for the study of heat transfer in engineering. The theoretical treatment of this system is greatly ...
  • Confined rotating convection with large Prandtl number: centrifugal effects on wall modes 

    Curbelo Hernández, Jezabel; López Moscat, Juan Manuel; Mancho Sánchez, Ana María; Marqués Truyol, Francisco (2014-01-23)
    Article
    Open Access
    Thermal convection in a rotating cylinder with a radius-to-height aspect ratio of G=4 for fluids with large Prandtl number is studied numerically. Centrifugal buoyancy effects are investigated in a regime where the Coriolis ...
  • Crossflow instability of finite Bödewadt flows: transients and spiral waves 

    López, Juan A.; Marqués Truyol, Francisco; Rubio, Antonio M.; Àvila Cañellas, Marc (2009-11)
    Article
    Open Access
    The flow in an enclosed rotating cylinder with a stationary lower end wall is investigated numerically. For fast rotation rates, the flow in the interior is primarily in the azimuthal direction, with an angular momentum ...
  • Dynamics of axially localized states in Taylor-Couette flows 

    López Alonso, José Manuel; Marqués Truyol, Francisco (2015-05-15)
    Article
    Open Access
    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 ...
  • 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 ...
  • Inertial waves in rapidly rotating flows: a dynamical systems perspective 

    López Moscat, Juan Manuel; Marqués Truyol, Francisco (2016-11-02)
    Article
    Open Access
    An overview of recent developments in a wide variety of enclosed rapidly rotating flows is presented. Highlighted is the interplay between inertial waves, which have been predicted from linear inviscid considerations, and ...
  • Instabilities and inertial waves generated in a librating cylinder 

    López, J.M.; Marqués Truyol, Francisco (2011-11-25)
    Article
    Restricted access - publisher's policy
    A librating cylinder consists of a rotating cylinder whose rate of rotation is modulated. When the mean rotation rate is large compared with the viscous damping rate, the flow may support inertial waves, depending on the ...
  • 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 ...
  • Instability of plumes driven by localized heating 

    López Moscat, Juan Manuel; Marqués Truyol, Francisco (2013-12)
    Article
    Open Access
    Plumes due to localized buoyancy sources are of wide interest owing to their prevalence in many situations. This study investigates the transition from laminar to turbulent dynamics. Several experiments have reported that ...
  • 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 ...
  • Nonlinear and detuning effects of the nutation angle in precessionally-forced rotating cylinder flow 

    Lopez Moscat, Juan Manuel; Marqués Truyol, Francisco (2016-06-16)
    Article
    Open Access
    The flow in a rapidly rotating cylinder forced to precess through a nutation angle a is investigated numerically, keeping all parameters constant except a, and tuned to a triadic resonance at a = 1º. When increasing a, ...
  • Optimal harmonic response in a confined Bödewadt boundary layer flow 

    Younghae, Do; Lopez, Juan M.; Marqués Truyol, Francisco (2010-09-01)
    Article
    Open Access
    The Bödewadt boundary layer flow on the stationary bottom end wall of a finite rotating cylinder is very sensitive to perturbations and noise. Axisymmetric radial waves propagating inward have been observed experimentally ...
  • Pinning of rotating waves to defects in finite Taylor-Couette flow 

    Pacheco, J. R.; López, J. M.; Marqués Truyol, Francisco (2011-01-10)
    Article
    Open Access
    Experiments in small aspect-ratio Taylor–Couette flows have reported the presence of a band in parameter space where rotating waves become steady non-axisymmetric solutions (a pinning effect) via infinite-period bifurcations. ...
  • Precession of a rapidly rotating cylinder flow: traverse through resonance 

    Marqués Truyol, Francisco; López Moscat, Juan Manuel (2015-10-06)
    Article
    Restricted access - publisher's policy
    Recent experiments using a rapidly rotating and precessing cylinder have shown that for specific values of the precession rate, aspect ratio and tilt angle, sudden catastrophic transitions to turbulence occur. Even if the ...
  • Prediction of image partitions using Fourier descriptors: application to segmentation-based coding schemes 

    Marqués Truyol, Francisco; Gasull Llampallas, Antoni (1998-04)
    Article
    Open Access
    This paper presents a prediction technique for partition sequences. It uses a region-by-region approach that consists of four steps: region parameterization, region prediction, region ordering, and partition creation. The ...
  • Rapidly rotating cylinder flow with an oscillating sidewall 

    López Moscat, Juan Manuel; Marqués Truyol, Francisco (2014-02-17)
    Article
    Open Access
    We present numerical simulations of a flow in a rapidly rotating cylinder subjected to a time-periodic forcing via axial oscillations of the sidewall. When the axial oscillation frequency is less than twice the rotation ...
  • Rapidly rotating precessing cylinder flows: forced triadic resonances 

    Lopez Moscat, Juan Manuel; Marqués Truyol, Francisco (2018-03-25)
    Article
    Restricted access - publisher's policy
    Rapidly rotating cylinder flows subjected to low-amplitude precessional forcing are studied numerically over a range of cylinder and precessional rotation rates. For sufficiently small rotation rates, viscous effects lead ...