Ara es mostren els items 1-19 de 19

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

    Mellibovsky Elstein, Fernando; Meseguer Serrano, Álvaro (2015-09-01)
    Article
    Accés obert
    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 ...
  • Bone tissue properties measurement by reference point indentation in glucocorticoid-induced osteoporosis 

    Mellibovsky, Leonardo; Prieto Alhambra, Daniel; Mellibovsky Elstein, Fernando; Gueerri Fernandez, Roberto; Nogués, Xavier; Randall, Connor; Hansma, Paul K.; Diez Perez, Adolfo (2015-09-01)
    Article
    Accés obert
    Glucocorticoids, widely used in inflammatory disorders, rapidly increase bone fragility and, therefore, fracture risk. However, common bone densitometry measurements are not sensitive enough to detect these changes. Moreover, ...
  • Dynamics on the pipe flow critical threshold 

    Mellibovsky Elstein, Fernando; Meseguer Serrano, Álvaro (2009-07)
    Text en actes de congrés
    Accés restringit per política de l'editorial
  • 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 ...
  • El enigma de Osborne Reynolds 

    Meseguer Serrano, Álvaro; Mellibovsky Elstein, Fernando (2010-03-01)
    Article
    Accés restringit per política de l'editorial
    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
    Accés obert
    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. ...
  • Emergence of spatio-temporal dynamics from exact coherent solutions in pipe flow 

    Ritter, Paul; Mellibovsky Elstein, Fernando; Avila Cañellas, Marc (2016-08-12)
    Article
    Accés obert
    Turbulent-laminar patterns are ubiquitous near transition in wall-bounded shear flows. Despite recent progress in describing their dynamics in analogy to non-equilibrium phase transitions, there is no theory explaining ...
  • Una Experiencia de unificación de asignaturas para desplegar PBL (y las quejas que originó) 

    Barrado Muxí, Cristina; Cuadrado Santolaria, Raúl; Delgado Muñoz, Luis; Mellibovsky Elstein, Fernando; Pastor Llorens, Enric; Pérez Batlle, Marcos; Prats Menéndez, Xavier; Rojas Gregorio, José Ignacio; Royo Chic, Pablo; Valero García, Miguel (Universitat Jaume I. Escola Superior de Tecnologia i Ciències Experimentals, 2013-07-10)
    Text en actes de congrés
    Accés obert
    En esta ponencia se describen los aspectos esenciales de una experiencia de unificación de parejas de asignaturas con el objetivo de crear un escenario más adecuado para el despliegue de Aprendizaje Basado en Proyectos. ...
  • 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
    Accés obert
    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 ...
  • From travelling waves to mild chaos: a supercritical bifurcation cascade in pipe flow 

    Mellibovsky Elstein, Fernando; Eckhardt, Bruno (2012-10-25)
    Article
    Accés restringit per política de l'editorial
    We study numerically a succession of transitions in pipe Poiseuille flow that leads from simple travelling waves to waves with chaotic time-dependence. The waves at the origin of the bifurcation cascade possess a shift-reflect ...
  • 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 ...
  • NACA 2412 performance modification via using AFC 

    Summ, Thorsten; Prakash, Bhanu; Bergadà Granyó, Josep Maria; Wierschem, Andreas; Mellibovsky Elstein, Fernando (2017)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    The NACA 2412 profile was numerically studied via employing 2D-DNS and implementing Active Flow Control (AFC), the Reynolds number considered was 6757, being the angle of attack of 8º. Initially, the basic flow without ...
  • Parametric analysis of active flow control using steady suction and steady blowing 

    Prakash, Bhanu; Mellibovsky Elstein, Fernando; Bergadà Granyó, Josep Maria (2017)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    Active Flow Control is implemented over NACA 2412 airfoil using Steady Suctionand Steady Blowing techniques. The pre-stall angle of attack (AOA) 12 0 is studied at a high Reynolds number (Re chord ) of 3.1*10 6 for ...
  • 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 ...
  • 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, ...
  • Subcritical equilibria in Taylor-Couette flow 

    Deguchi, Kengo; Meseguer Serrano, Álvaro; Mellibovsky Elstein, Fernando (2014-05-08)
    Article
    Accés obert
    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 ...
  • Takens–Bogdanov bifurcation of travelling-wave solutions in pipe flow 

    Mellibovsky Elstein, Fernando; Eckhardt, Bruno (2011-02)
    Article
    Accés obert
    The appearance of travelling-wave-type solutions in pipe Poiseuille flow that are disconnected from the basic parabolic profile is numerically studied in detail. We focus on solutions in the twofold azimuthally-periodic ...
  • Testing otter board hydrodynamic performances in wind tunnel facilities 

    Mellibovsky Elstein, Fernando; Prat Farran, Joana d'Arc; Notti, Emilio; Sala, Antonello (2015-08-01)
    Article
    Accés obert
    The feasibility and potential advantages of wind tunnel testing of otter board designs are assessed. Traditional flume tank tests incur high operational costs and present some limitations in terms of flexibility and accuracy. ...
  • Una experiencia de unificación de asignaturas para desplegar PBL (y las quejas que originó) 

    Barrado Muxí, Cristina; Cuadrado Santolaria, Raúl; Delgado Muñoz, Luis; Mellibovsky Elstein, Fernando; Pastor Llorens, Enric; Pérez Batlle, Marcos; Prats Menéndez, Xavier; Rojas Gregorio, José Ignacio; Royo Chic, Pablo; Valero García, Miguel (2013-09)
    Article
    Accés obert
    En este artículo se describen los aspectos esenciales de una experiencia de unificación de parejas de asignaturas con el objetivo de crear un escenario más adecuado para el despliegue de Aprendizaje Basado en Proyectos. ...