Aquesta línia de recerca té com a objectiu estudiar la dinàmica de règims preturbulents o de turbulència plenament desenvolupada. Per extensió, s'estudien problemes associats amb la dinàmica no lineal d'ones, sistemes complexos, formació d'estructures dissipatives (patterns), etc. La major part dels problemes objecte d'estudi corresponen a sistemes d'interès geofísic o de recerca bàsica, és a dir, oceanografia, dinàmica atmosfèrica, dinàmica mediambiental, però també són objecte d'estudi alguns models matemàtics d'interès físic o biològic susceptibles de propagar ones, fronts, polsos, defectes, etc. Com a exemple de problemes en estudi podem esmentar la convecció tèrmica, la turbulència en fluids estratificats, els sistemes en rotació, la dinàmica de mescles, l'arrossegament de sediments, els corrents de gravetat, etc. Quant a les tècniques que s'utilitzen, en el camp de la teoria es combina la simulació numèrica directa de processos amb tècniques analítiques de reducció a formes normals, equacions d'amplitud, dinàmica caòtica, etc. En el terreny experimental, la tècnica més emprada és el tractament digital d'imatges de fluxos obtinguts en experiments de laboratori.

Pàgina web del grup de recerca

Recent Submissions

  • On the morphodynamic stability of intertidal environments and the role of vegetation 

    Kakeh Burgada, Nabil; Giovanni, Coco; Marani, Marco (Elsevier, 2016-07-01)
    Article
    Restricted access - publisher's policy
    We describe the coupled biotic and abiotic dynamics in intertidal environments using a point model that includes suspended sediment deposition, wave-and current-driven erosion, biofilm sediment stabilization, and sediment ...
  • Natural convection in a horizontal cylinder with axial rotation 

    Sánchez Casals, Odalys de la Caridad; Mercader Calvo, María Isabel; Batiste Boleda, Oriol; Alonso Maleta, María Aránzazu (AMER PHYSICAL SOC, 2016-06-23)
    Article
    Open Access
    We study the problem of thermal convection in a laterally heated horizontal cylinder rotating about its axis. A cylinder of aspect ratio Gamma = H/2R = 2 containing a small Prandtl number fluid (sigma = 0.01) representative ...
  • 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 ...
  • Continuation and stability of convective modulated rotating waves in spherical shells 

    García González, Fernando; Net Marcé, Marta; Sánchez Umbría, Juan (2016-01-01)
    Article
    Open Access
    Modulated rotating waves (MRW), bifurcated from the thermal-Rossby waves that arise at the onset of convection of a fluid contained in a rotating spherical shell, and their stability, are studied. For this purpose, ...
  • Critical torsional modes of convection in rotating fluid spheres at high Taylor numbers 

    Sánchez Umbría, Juan; García González, Fernando; Net Marcé, Marta (2016-02-15)
    Article
    Open Access
    A numerical study of the onset of convection in rotating internally heated self-gravitating fluid spheres is presented. The exploration of the stability of the conduction state versus the Taylor and Prandtl numbers supplies ...
  • 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
    Open Access
    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, ...
  • Continuation of bifurcations of cycles in dissipative PDEs 

    Sánchez Umbría, Juan; Net Marcé, Marta (2015)
    Conference report
    Open Access
    A new efficient methodology for the continuation of the codimension-one bifurcations of periodic orbits, including pitchfork bifurcations present in reflection--symmetric systems, has been developed. It is based on the ...
  • El canvi climàtic a través dels informes de l'IPCC (1990-2014) 

    Mazón Bueso, Jordi (Càtedra UNESCO en Sostenibilitat., 2016-01-20)
    Article
    Open Access
    Des de que l’any 1990 es va publicar el primer informe del Panell Intergovernamental del Canvi Climàtic (en anglès IPCC) quatre més han aparegut (els anys 1995, 2001, 2007 i 2014), els quals ens donen una visió de ...
  • 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 ...
  • Filtrado transversal adaptativo de varianza constante para la ecualización de canal 

    Vázquez Grau, Gregorio; Gasull Llampallas, Antoni; Sánchez Umbría, Juan; Oliveras Vergés, Albert (1989)
    Conference report
    Open Access
    This paper describes the problem of lineal filtering of noisy data under a Maximum Likelihood objective. In this sense, the paper shows that a weighted square error cost function deals and it is necessary to weight the ...

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