Recent Submissions

  • Multi-layered solid-PCM thermocline thermal storage concept for CSP plants. Numerical analysis and perspectives 

    Galione Klot, Pedro Andrés; Pérez Segarra, Carlos David; Rodríguez Pérez, Ivette María; Oliva Llena, Asensio; Rigola Serrano, Joaquim (2015-03-15)
    Article
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    Thermocline storage concept has been considered for more than a decade as a possible solution to reduce the huge cost of the storage system in concentrated solar power (CSP) plants. However, one of the drawbacks of this ...
  • From extruded-2D to fully-3D geometries for DNS: a multigrid-based extension of the Poisson solver 

    Gorobets, Andrei; Trias Miquel, Francesc Xavier; Soria Guerrero, Manel; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2010)
    Article
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    Direct numerical simulation (DNS) of incompressible flows is an essential tool for improving the understanding of the physics of turbulence and for the development of better turbulence models. The Poisson equation, the ...
  • DNS of turbulent natural convection flows on the MareNostrum supercomputer 

    Trias Miquel, Francesc Xavier; Gorobets, Andrei; Soria Guerrero, Manel; Oliva Llena, Asensio (2009)
    Article
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    A code for the direct numerical simulation (DNS) of incompressible turbulent flows that provides a fairly good scalability for a wide range of computer architectures has been developed. The spatial discretization of the ...
  • Low-frequency unsteadiness in the vortex formation region of a circular cylinder 

    Lehmkuhl Barba, Oriol; Rodríguez Pérez, Ivette María; Borrell Pol, Ricard; Oliva Llena, Asensio (2013-08-23)
    Article
    Open Access
    The presence of low-frequency fluctuations in the wake of bluff bodies have been observed in several investigations. Even though the flow past a circular cylinder at Re = 3900 (Re = U ref D/ν) has been the object of several ...
  • Direct numerical simulation of a NACA0012 in full stall 

    Rodríguez Pérez, Ivette María; Lehmkuhl Barba, Oriol; Borrell Pol, Ricard; Oliva Llena, Asensio (2013-10-15)
    Article
    Open Access
    This work aims at investigating the mechanisms of separation and the transition to turbulence in the separated shear-layer of aerodynamic profiles, while at the same time to gain insight into coherent structures formed ...
  • Limits of the Oberbeck–Boussinesq approximation in a tall differentially heated cavity filled with water 

    Kizildag, Deniz; Rodríguez Pérez, Ivette María; Oliva Llena, Asensio; Lehmkuhl Barba, Oriol (2014-01-01)
    Article
    Open Access
    The present work assesses the limits of the Oberbeck–Boussinesq (OB) approximation for the resolution of turbulent fluid flow and heat transfer inside a tall differentially heated cavity of aspect ratio G = 6.67 filled ...
  • Heat transfer analysis and numerical simulation of a parabolic trough solar collector 

    Amine Hachicha, Ahmed; Rodríguez Pérez, Ivette María; Capdevila Paramio, Roser; Oliva Llena, Asensio (2013-11-01)
    Article
    Open Access
    Parabolic trough solar collector is the most proven industry-scale solar generation technology today available. The thermal performance of such devices is of major interest for optimising the solar field output and increase ...
  • Symmetry-preserving discretization of Navier-Stokes equations on collocated unstructured meshes 

    Trias Miquel, Francesc Xavier; Lehmkuhl Barba, Oriol; Oliva Llena, Asensio; Pérez Segarra, Carlos David; Verstappen, R.W.C.P. (2014-02-01)
    Article
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    A fully-conservative discretization is presented in this paper. The same principles followed by Verstappen and Veldman (2003) [3] are generalized for unstructured meshes. Here, a collocated-mesh scheme is preferred over a ...
  • Improved semi-analytical method for air curtains prediction 

    Giráldez García, Héctor; Pérez Segarra, Carlos David; Rodríguez Pérez, Ivette María; Oliva Llena, Asensio (2013-11)
    Article
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    The present study is devoted to the analysis and prediction of the efficiency of air curtains. The attention is focused on improving existing semi-analytical methods with the information from CFD simulations and experimental ...
  • A simple approach to discretize the viscous term with spatially varying (eddy-)viscosity 

    Trias Miquel, Francesc Xavier; Gorobets, Andrei; Oliva Llena, Asensio (2013-11-15)
    Article
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    A simple approach to discretize the viscous dissipation term in the incompressible Navier–Stokes equations with spatially varying viscosity is presented. Unlike the case where the viscosity remains constant, its discretization ...

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