Ara es mostren els items 1-20 de 233

  • 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
    Accés restringit per política de l'editorial
    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 complete analysis of the heat, air and moisture transfer on building performance 

    Souaihi, Oussama; Lopez, Joan; Capdevila Paramio, Roser; Rigola Serrano, Joaquim; Lehmkuhl Barba, Oriol; Oliva Llena, Asensio (2016)
    Text en actes de congrés
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    The simulation of combined heat, air and moisture (HAM) is important to predict the indoor air quality and thermal comfort. Moreover, inappropriate levels of indoor humidity and temperature can contribute to a high movement ...
  • A coupled volume-of-fluid/level-set method for simulation of two-phase flows in unstructured meshes 

    Balcázar Arciniega, Néstor; Lehmkuhl Barba, Oriol; Jofre Cruanyes, Lluís; Rigola Serrano, Joaquim; Oliva Llena, Asensio (Elsevier, 2016-01)
    Article
    Accés obert
    This paper presents a methodology for simulation of two-phase flows with surface tension in the framework of unstructured meshes, which combines volume-of-fluid with level-set methods. While the volume-of-fluid transport ...
  • Advanced analysis of thermal energy storage in CSP plants 

    Pérez Segarra, Carlos David; González Acedo, Ignacio; Torras Ortiz, Santiago; Rigola Serrano, Joaquim; Oliva Llena, Asensio (2016-11-24)
    Report de recerca
    Accés obert
  • Advanced CFD&HT numerical modeling of solar tower receivers 

    Colomer Rey, Guillem; Chiva Segura, Jorge; Lehmkuhl Barba, Oriol; Oliva Llena, Asensio (Elsevier, 2013)
    Text en actes de congrés
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    This paper presents an advanced methodology for the detailed modeling of the heat transfer and fluid dynamics phenomena in solar tower receivers. It has been carried out in the framework of a more ambitious enterprise which ...
  • A dynamic wall model for large eddy simulation on unstructured meshes. Application to wind turbine dedicated airfoils 

    Calafell Sandiumenge, Joan; Lehmkuhl Barba, Oriol; Rodríguez Pérez, Ivette María; Oliva Llena, Asensio; Pérez Segarra, Carlos David (Begell House, 2015)
    Text en actes de congrés
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    Large eddy simulations (LES) of wall resolved flows at high Reynolds number are still computation-ally demanding. In the present work, a new Dynamic Wall Model (DWM) for LES is presented. The methodology, implemented on ...
  • A filtered kinetic energy preserving finite volumes scheme for compressible flows 

    Baez Vidal, Aleix; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2012)
    Text en actes de congrés
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    The Kinetic Energy Preserving Scheme (KEP) for compressible flows has been shown to solve 1-D shock waves without smearing them. The method does not add numerical diffusion to solutions but, as a counterpart, it needs ...
  • 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
    Accés obert
    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 fluid-structure interaction solver for the fluid flow through reed type valves 

    González Acedo, Ignacio; Naseri, Alireza; Rigola Serrano, Joaquim; Pérez Segarra, Carlos David; Oliva Llena, Asensio (Institute of Physics (IOP), 2017)
    Comunicació de congrés
    Accés obert
    Suction and discharge processes with self actuated valves have a major influence in efficiency and reliability of hermetic reciprocating compressors. Understanding the operation completely in order to enhance compressor's ...
  • A generalized computational model for the simulation of adsorption packed bed reactors – Parametric study of five reactor geometries for cooling applications 

    Papakokkinos, Giorgos; Castro González, Jesús; Lopez, Joan; Oliva Llena, Asensio (2019-02-01)
    Article
    Accés restringit per política de l'editorial
    Environmental concerns regarding global warming and ozone depletion urge towards sustainable solutions for satisfying the increasing cooling demand. Adsorption cooling technology could form part of the solution since it ...
  • A level-set aided single-phase model for the numerical simulation of free-surface flow on unstructured meshes 

    Schillaci, Eugenio; Jofre Cruanyes, Lluís; Balcázar Arciniega, Néstor; Lehmkuhl, Oriol; Oliva Llena, Asensio (Elsevier, 2016-11-25)
    Article
    Accés obert
    A new single-phase scheme for the numerical simulation of free-surface problems on 3-D unstructured meshes is presented. The flow field is obtained from the discrete solution of the incompressible Navier-Stokes equations, ...
  • A level-set method for thermal motion of bubbles and droplets 

    Balcázar Arciniega, Néstor; Oliva Llena, Asensio; Rigola Serrano, Joaquim (Institute of Physics (IOP), 2016)
    Text en actes de congrés
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    A conservative level-set model for direct simulation of two-phase flows with thermocapillary effects at dynamically deformable interface is presented. The Navier-Stokes equations coupled with the energy conservation equation ...
  • 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 obert
    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 ...
  • Algebraic implementation of a flux limiter for heterogeneous computing 

    Valle Marchante, Nicolás; Álvarez Farré, Xavier; Trias Miquel, Francesc Xavier; Castro González, Jesús; Oliva Llena, Asensio (2018)
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  • A load balancing method for parallel genetic CFD optimizations 

    Aizpurua Udabe, Imanol; Lehmkuhl Barba, Oriol; Borrell Pol, Ricard; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2015)
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    CFD optimizations are characterized by long and highly variable objective function evaluation times. The aim of this study is to improve the parallel performance using a new load balancing master-worker parallelization ...
  • A low-dissipation convection scheme for the stable discretization of turbulent interfacial flow 

    Schillaci, Eugenio; Jofre Cruanyes, Lluís; Balcázar Arciniega, Néstor; Antepara Zambrano, Óscar; Oliva Llena, Asensio (Elsevier, 2017-08-10)
    Article
    Accés restringit per política de l'editorial
    This paper analyzes a low-dissipation discretization for the resolution of immiscible, incompressible multiphase flow by means of interface-capturing schemes. The discretization is built on a three-dimensional, unstructured ...
  • 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 multiple marker level-set method for simulation of deformable fluid particles 

    Balcázar Arciniega, Néstor; Lehmkuhl Barba, Oriol; Rigola Serrano, Joaquim; Oliva Llena, Asensio (2015-09-01)
    Article
    Accés obert
    A novel multiple marker level-set method is introduced for Direct Numerical Simulation of deformable fluid particles (bubbles and droplets), which is integrated in a finite-volume framework on collocated unstructured grids. ...
  • Analysis and design of a drain water heat recovery storage unit based on PCM plates 

    Morales-Ruiz, S; Rigola Serrano, Joaquim; Oliet Casasayas, Carles; Oliva Llena, Asensio (2016-10-01)
    Article
    Accés obert
    This paper is focused on the detailed analysis of a PCM plate heat storage unit with a particular configuration, looking for the maximum contact area with the fluid (water) and the minimum volume to be used in a real ...
  • Analysis of fin-and-tube evaporators in no-frost domestic refrigerators 

    Oliet Casasayas, Carles; Pérez Segarra, Carlos David; Rigola Serrano, Joaquim; Oliva Llena, Asensio (2010)
    Comunicació de congrés
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    This paper summarizes the research work carried out by the authors on domestic refrigerator no-frost evaporators. It includes an explanation of the experimental unit that is currently being constructed to test isobutane ...