Recent Submissions

  • Optimization of synthetic jet actuation on a SD7003 airfoil in stall conditions 

    Monshi Tousi, Navid; El Mansy, Reda; Mellibovsky Elstein, Fernando; Bergadà Granyó, Josep Maria (2022)
    Conference report
    Open Access
    We optimise a set of Synthetic Jet (SJ) Active Flow Control (AFC) parameters on a SD7003 airfoil in order to maximise lift and aerodynamic efficiency. 2D-RANS with the Spallart Almaras (SA) turbulence model is employed in ...
  • Square cylinder downstream of two different-velocity streams 

    El Mansy, Reda; Monshi Tousi, Navid; Bergadà Granyó, Josep Maria; Mellibovsky Elstein, Fernando (2022)
    Conference lecture
    Open Access
    We study the flow past a square cylinder immersed in the wake of an upstream splitter plate separating two different-velocity streams. The bottom stream Reynolds number, ReB = 56 is kept constant for all cases, while the ...
  • Aerodynamic study of the NASA’s X-43A hypersonic aircraft 

    Navó, Alex; Bergadà Granyó, Josep Maria (2022)
    Conference report
    Open Access
    A two-dimensional aerodynamic study of the NASA’s X-43A hypersonic aircraft is developed using two different approaches. The first one is analytical and based on the resolution of the oblique shock wave and Prandtl–Meyer ...
  • Energy-preserving stable computations of high-pressure supercritical fluids turbulence 

    Ollé Bernades, Marc; Capuano, Francesco; Trias Miquel, Francesc Xavier; Jofre Cruanyes, Lluís (2022)
    Conference report
    Open Access
    High-fidelity computations of turbulent flows at high-pressure supercritical fluid conditions present significant challenges. Besides the inherent broadband nature of the flow, the rapid variation of thermophysical properties ...
  • Box-Jenkins autoregressive models for PEMFC operating under dynamical conditions 

    Aguilar Plazaola, José Agustín; Husar, Attila Peter; Andrade-Cetto, Juan (2021)
    Conference report
    Open Access
    The objective of the present work is to explore and validate autoregressive, control oriented models models Proton Exchange Membrane Fuel Cells coperatinf under dynamic condditions. Autoregressive models have several ...
  • Experimental investigation on the dynamic response of Pelton runners 

    Egusquiza Montagut, Mònica; Valero Ferrando, Ma. del Carmen; Presas Batlló, Alexandre; Valentín Ruiz, David; Egusquiza Estévez, Eduard (Institute of Physics (IOP), 2019)
    Conference report
    Open Access
    An effective condition monitoring is essential to increase the availability of Pelton turbines and to avoid unexpected damage. The main challenge consists in determining the deformations and the stresses in the runner while ...
  • On the exctitation of a submerged disk-like structure with RSI patterns 

    Presas Batlló, Alexandre; Valentín Ruiz, David; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen; Seidel, Ulrich (2015)
    Conference report
    Restricted access - confidentiality agreement
    Determining the dynamic response of submerged and confined disk-like structures is of interest in the hydraulic turbines field. Disks present similar dynamic characteristics than hydraulic turbine runners, especially in ...
  • Transient Analysis of Pelton Turbine Prototypes 

    Egusquiza Montagut, Mònica; Valentín Ruiz, David; Valero Ferrando, Ma. del Carmen; Presas Batlló, Alexandre; Egusquiza Estévez, Eduard (2021)
    Conference report
    Open Access
    One of the most critical operating conditions in hydraulic turbines is the start-up transient. This may be characterized by the presence of several resonances, which increase the vibration and stress levels on the runners. ...
  • A novel condition monitoring methodology based on neural network of pump-turbines with extended operating range 

    Zhao, Weiqiang; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen; Egusquiza Montagut, Mònica; Valentín Ruiz, David; Presas Batlló, Alexandre (2019)
    Conference report
    Open Access
    Due to the entrance of new renewable energies, water-storage energy has to be regulated more frequently to keep the stability of power grid. Consequently, pump-turbines have to work under offdesign conditions more than ...
  • Azimuthal waves and their stability in externally heated rotating spherical shells 

    Sánchez Umbría, Juan; García González, Fernando; Net Marcé, Marta (2011)
    Conference report
    Open Access
    Azimuthal waves appearing in the thermal convection of a pure fluid contained in a spherical shell with both boundaries at different temperatures are studied. They are computed by using continuation methods as steady ...
  • Stability analysis for the onset of convection in rotating fluid binary mixtures in spherical shells 

    Net Marcé, Marta; García González, Fernando; Sánchez Umbría, Juan (2011)
    Conference report
    Open Access
    The stability analysis of the basic conductive state of a rotating binary mixture of two fluids bounded by spherical shells is studied. The Boussinesq approximation of the mass conservation, Navier-Stokes, energy and ...
  • Natural frequencies of rotating disk-like structures submerged viewed from the stationary frame 

    Presas Batlló, Alexandre; Valentín Ruiz, David; Egusquiza Estévez, Eduard; Valero Ferrando, Ma. del Carmen; Seidel, Ulrich (2021)
    Conference report
    Open Access
    To understand the effect of rotation in the dynamic response of pump-turbine runners, simplified models such as disk-like structures can be used. In previous researches the natural frequencies and mode shapes of rotating ...

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