Ara es mostren els items 20-39 de 47

    • Impact of centrifugal buoyancy on strato-rotational instability 

      Lopez Moscat, Juan Manuel; Marqués Truyol, Francisco (2020-05-10)
      Article
      Accés obert
      In a recent experiment on the flow between two concentric cylinders with the inner cylinder rotating and the fluid being stably stratified, Flór et al. (Phys. Fluids, vol. 30, 2018, 084103) found helical wave structures ...
    • Impact of nonuniform ambient stratification on thermal plume dynamics 

      Marqués Truyol, Francisco; Lopez, Juan M (2023-02-27)
      Article
      Accés restringit per política de l'editorial
      Thermal plumes arising from localized buoyancy sources are very common in nature and industrial settings. They have been extensively studied experimentally, theoretically, and numerically, mostly focusing on entrainment ...
    • Inertial waves in rapidly rotating flows: a dynamical systems perspective 

      López Moscat, Juan Manuel; Marqués Truyol, Francisco (2016-11-02)
      Article
      Accés obert
      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
      Accés restringit per política de l'editorial
      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
      Accés obert
      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
      Accés obert
      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
      Accés obert
      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 ...
    • Momento de inercia 

      Sanz, Clara; Marqués Truyol, Francisco; Calvete Manrique, Daniel (2018-07-04)
      Audiovisual
      Accés obert
      Este vídeo forma parte del MOOC "El lenguaje de la Ingeniería". Módulo de Física.
    • 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
      Accés obert
      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
      Accés obert
      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 ...
    • Phase-locking flows between orthogonally stretching parallel plates 

      Wang, Baoying; Ayats López, Roger; Meseguer Serrano, Álvaro; Marqués Truyol, Francisco (2022-11-04)
      Article
      Accés obert
      In this paper, we explore the stability and dynamical relevance of a wide variety of steady, time-periodic, quasiperiodic, and chaotic flows arising between orthogonally stretching parallel plates. We first explore the ...
    • Pinning of rotating waves to defects in finite Taylor-Couette flow 

      Pacheco, J. R.; López, J. M.; Marqués Truyol, Francisco (2011-01-10)
      Article
      Accés obert
      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
      Accés restringit per política de l'editorial
      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
      Accés obert
      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
      Accés obert
      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
      Accés restringit per política de l'editorial
      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 ...
    • Shear instabilities in Taylor-Couette flow 

      Meseguer Serrano, Álvaro; Mellibovsky Elstein, Fernando; Marqués Truyol, Francisco; Àvila Cañellas, Marc (Springer, 2009-09-09)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      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 ...
    • Small aspect ratio Taylor-Couette flow: onset of a very-low-frequency three-torus state 

      López Moscat, Juan Manuel; Marqués Truyol, Francisco (2003-09-03)
      Article
      Accés obert
      The nonlinear dynamics of Taylor-Couette flow in a small aspect ratio annulus (where the length of the cylinders is half of the annular gap between them) is investigated by numerically solving the full three-dimensional ...
    • Spiral vortices between concentric cylinders 

      Sánchez Umbría, Juan; Crespo Artiaga, Daniel; Marqués Truyol, Francisco (1993-06-01)
      Article
      Accés restringit per política de l'editorial
      Spiral vortices appearing in Couette- Taylor flows are studied by means of numerical simulation. Transition curves from Couctte to spiral vortices for different radius ratios and wavenumbers have been calculated in order ...
    • Spontaneous generation of a swirling plume in a stratified ambient 

      Marqués Truyol, Francisco; López Moscat, Juan Manuel (2014-12-01)
      Article
      Accés restringit per política de l'editorial
      The transition from laminar to complex spatio-temporal dynamics of plumes due to a localized buoyancy source is studied numerically. Several experiments have reported that this transition is sensitive to external perturbations. ...