Ara es mostren els items 1-20 de 38

  • A 3-D volume-of-fluid advection method based on cell-vertex velocities for unstructured meshes 

    Jofre Cruanyes, Lluís; Lehmkuhl Barba, Oriol; Castro González, Jesús; Oliva Llena, Asensio (Elsevier, 2014-05-01)
    Article
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    A new geometrical Volume-of-Fluid (VOF) method for capturing interfaces on three-dimensional (3-D) Cartesian and unstructured meshes is introduced. The method reconstructs interfaces as first- and second-order piecewise ...
  • A finite-volume/level-set interface capturing method for unstructured grids: Simulations of bubbles rising through viscous liquids 

    Balcázar Arciniega, Néstor; Jofre Cruanyes, Lluís; Lehmkuhl Barba, Oriol; Rigola Serrano, Joaquim; Castro González, Jesús; Oliva Llena, Asensio (WIT Press, 2014)
    Text en actes de congrés
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    A numerical method is developed for simulating two-phase flows with moving inter-phase boundaries, which is integrated in a finite-volume framework on collocated unstructured grids of arbitrary element type. The location, ...
  • A finite-volume/level-set method for simulating two-phase flows on unstructured grids 

    Balcázar Arciniega, Néstor; Jofre Cruanyes, Lluís; Lehmkuhl Barba, Oriol; Castro González, Jesús; Rigola Serrano, Joaquim (2014-09)
    Article
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    The conservative level-set method for capturing the interface between two fluids is combined with a variable density projection scheme to simulate incompressible two-phase flows on unstructured meshes. All equations are ...
  • A free surface model for the numerical simulation of oscillating water column systems 

    Schillaci, Eugenio; Balcázar Arciniega, Néstor; Jofre Cruanyes, Lluís; Lehmkuhl Barba, Oriol; Castro González, Jesús (International Association for Computational Mechanics (IACM), 2014)
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    The aim of this work is to propose and validate a numerical model that represents the hydrodynamic behavior of an Oscillating Water Column (OWC) device, that has been shown to be one of the most promising ways to extract ...
  • A level-set model for thermocapillary motion of deformable fluid particles 

    Balcázar Arciniega, Néstor; Rigola Serrano, Joaquim; Castro González, Jesús; Oliva Llena, Asensio (2016-12-01)
    Article
    Accés restringit per política de l'editorial
    A new level-set model is proposed for simulating immiscible thermocapillary flows with variable fluid-property ratios at dynamically deformable interfaces. The Navier–Stokes equations coupled with the energy conservation ...
  • A multiple marker level-set method for simulation of bubbly flows 

    Balcázar Arciniega, Néstor; Jofre Cruanyes, Lluís; Lehmkuhl Barba, Oriol; Castro González, Jesús; Oliva Llena, Asensio (International Association for Computational Mechanics (IACM), 2014)
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    A multiple marker level-set (MLS) method is introduced for Direct Numerical Simulation of bubbles and droplets, which is integrated in a finite-volume framework on collocated unstructured grids of arbitrary element type. ...
  • A PLIC-VOF implementation on parallel 3D unstructured meshes 

    Jofre Cruanyes, Lluís; Lehmkuhl Barba, Oriol; Castro González, Jesús; Oliva Llena, Asensio (2010)
    Comunicació de congrés
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    The numerical simulation of interfacial and free surface ows is a vast and interesting topic in the areas of engineering and fundamental physics, such as the study of liquid-gas interfaces, formation of droplets, bubbles ...
  • Comparison of the performance of falling film and bubble absorbers for air-cooled absorption systems 

    Castro González, Jesús; Oliet Casasayas, Carles; Rodríguez Pérez, Ivette María; Oliva Llena, Asensio (2009-07-01)
    Article
    Accés obert
    Small capacity, air-cooled NH3–H2O absorption systems are becoming more attractive in applications where the input energy can be obtained for free (e.g., solar energy, exhaust gases of engines, etc.), due to the increasing ...
  • Conservative discretization of multiphase flow with high density ratios 

    Jofre Cruanyes, Lluís; Lehmkuhl Barba, Oriol; Balcázar Arciniega, Néstor; Castro González, Jesús; Rigola Serrano, Joaquim; Oliva Llena, Asensio (WIT Press, 2014)
    Text en actes de congrés
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    The computation of multiphase flows presenting high density ratios, where the fluids involved are considered immiscible, are of great importance for fundamental physics and industrial applications; such as the study of ...
  • Direct numerical simulation of the flow over a spherical bubble in a turbulent pipe flow 

    Jofre Cruanyes, Lluís; Balcázar Arciniega, Néstor; Lehmkuhl Barba, Oriol; Borrell Pol, Ricard; Castro González, Jesús (International Association for Computational Mechanics (IACM), 2014)
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    This work aims at investigating, by means of a direct numerical simulation, the flow over a clean spherical bubble fixed on the axis of a turbulent pipe flow. The simulation is performed by means of a parallel unstructured ...
  • DNS of the rising motion of a swarm of bubbles in a confined vertical channel 

    Balcázar Arciniega, Néstor; Lehmkuhl Barba, Oriol; Castro González, Jesús; Oliva Llena, Asensio (Springer, 2018)
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  • Energy efficiency in buildings: dynamic numerical simulation and application to retroffiting edification 

    Rigola Serrano, Joaquim; Capdevila Paramio, Roser; López Mas, Joan; Kizildag, Deniz; Castro González, Jesús; Pérez Segarra, Carlos David (2016-11-24)
    Report de recerca
    Accés obert
  • Experimental and numerical investigation of H2O vapor absorption processes in falling film of LiBr aqueous solution in vertical tubes 

    Castro González, Jesús; Farnós Baulenas, Joan; García Rivera, Eduardo; Oliva Llena, Asensio (2013)
    Text en actes de congrés
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    The LiBr-H2O absorption systems are used mainly in large cooling capacity applications (industry, large buildings, etc.), therefore require water from cooling towers to reject heat. However, if middle and low capacity are ...
  • Experimental evaluation of a pre-industrial air-cooled LiBr-H2O small capacity absorption machine 

    Farnós Baulenas, Joan; Castro González, Jesús; García-Rivera, Eduardo; Oliva Llena, Asensio; Chiva Segura, Jorge (2011)
    Comunicació de congrés
    Accés obert
    The paper studies thermal design and describes the experimental set-up of a domestic-scale prototype experimental cooling system based on a 7kW of nominal capacity single-stage small LiBr-H2O air-cooled absorption machine. ...
  • Gravity-driven motion of a swarm of bubbles in a vertical pipe 

    Balcázar Arciniega, Néstor; Lehmkuhl Barba, Oriol; Castro González, Jesús; Rigola Serrano, Joaquim; Oliva Llena, Asensio (2015)
    Text en actes de congrés
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    In this work, Direct Numerical Simulations of gravity-driven motion of a swarm of bubbles in a vertical pipe are presented. These simulations were carried out in the contex of a multiple marker level-set methodology, which ...
  • Hot run test results of a validation optimized water-ice phase change heat accumulator and comparison to numerical analysis¿X¿¿c 

    Riccius, Jorg; Leiner, Johannes; Castro González, Jesús; Rigola Serrano, Joaquim (2013)
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    Phase change heat accumulators are essential devices for the thermal management of multiple ignition, electric pump driven in-space propulsion systems such as the Low Cost Cryogenic Propulsion (LCCP) system [1], [2]. For ...
  • Modelling and experimental validation of the heat accumulator in a Low Trust Cryogenic Propulsion (LTCP) system¿¿e, 

    Torras Ortiz, Santiago; Castro González, Jesús; Rigola Serrano, Joaquim; Morales, Sergio; Riccius, Jorg; Leiner, Johannes (2013)
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    The study of one of the components, the heat accumulator, of Low Thrust Cryogenic Propulsion systems (LTCP), is of scientific interest in the framework of ISP-1 project [1]. This device stores thermal energy from the fuel ...
  • Modelling of absorption of H2O vapor in falling film of lbr aqueous solution in vertical tubes with presence of non-condensables 

    García-Rivera, Eduardo; Castro González, Jesús; Farnós Baulenas, Joan; Oliva Llena, Asensio (2012)
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    One of the main reasons of the discrepancies between theoretical predictions made by models of absorbers of H2O-LiBr absorption chillers when they are compared with experimental results under real conditions is the presence ...
  • New implementations of surface tension forces for PLIC-VOF methods 

    Castro González, Jesús; Oliva Llena, Asensio (2010)
    Comunicació de congrés
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    A comparative study has been carried out between different models of implementing surface tension for PLIC-VOF methods: i) the well known Continuum Surface Force (CSF); ii) Staggered Grid Interface Pressure (SGIP); iii) ...
  • Numerical and experimental investigation of a vertical LiBr falling film absorber considering wave regimes and in presence of mist flow 

    Garcia Rivera, Eduardo; Castro González, Jesús; Farnós Baulenas, Joan; Oliva Llena, Asensio (2016-11-01)
    Article
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    The absorber represents the most critical component in absorption systems and one of the key issues. In this component complex heat and mass transfer phenomena during the absorption process takes place simultaneously. For ...