Now showing items 1-20 of 271

    • 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
      Restricted access - publisher's policy
      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 comparative study of interface capturing methods with amr for incompressible two-phase flows 

      Antepara Zambrano, Óscar; Balcázar Arciniega, Néstor; Oliva Llena, Asensio (CIMNE, 2017)
      Conference report
      Open Access
      This paper presents a comparative study of interface capturing methods with adaptive mesh refinement for Direct Numerical Simulation (DNS) of incompressible two- phase flows. The numerical algorithms for fluid motion ...
    • 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)
      Conference report
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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
      Open Access
      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 ...
    • 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)
      Conference report
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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)
      Conference report
      Open Access
      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)
      Conference report
      Open Access
      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)
      Conference lecture
      Open Access
      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
      Open Access
      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 Barba, Oriol; Oliva Llena, Asensio (Elsevier, 2016-11-25)
      Article
      Open Access
      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 interfacial heat or mass transfer in two-phase flows 

      Balcázar Arciniega, Néstor; Antepara Zambrano, Óscar; Rigola Serrano, Joaquim; Oliva Llena, Asensio (International Centre for Numerical Methods in Engineering (CIMNE), 2018)
      Conference lecture
      Restricted access - publisher's policy
      A level-set model is proposed for simulating interfacial heat or mass transfer in two-phase flows. The Navier-Stokes equations as well as the heat transfer or mass transfer equations are discretized using a finite-volume ...
    • A level-set method for mass transfer in bubble swarms 

      Balcázar Arciniega, Néstor; Antepara Zambrano, Óscar; Castro González, Jesús; Oliva Llena, Asensio (2018)
      Conference lecture
      Restricted access - publisher's policy
    • 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)
      Conference report
      Open Access
      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 mass transfer in bubbly flows 

      Balcázar Arciniega, Néstor; Antepara Zambrano, Óscar; Rigola Serrano, Joaquim; Oliva Llena, Asensio (2019-08-01)
      Article
      Open Access
      A level-set model is presented for simulating mass transfer or heat transfer in two-phase flows. The Navier-Stokes equations and mass transfer (or heat transfer) equation are discretized using a finite volume method on a ...
    • 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
      Open Access
      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 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)
      Conference report
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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
      Open Access
      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 method for fluid-structure interaction problems with non-Newtonian fluid 

      Amani, Ahmad; Naseri, Alireza; Pérez Segarra, Carlos David; Oliva Llena, Asensio (International Centre for Numerical Methods in Engineering (CIMNE), 2018)
      Conference lecture
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      This paper represents a numerical method to solve fluid-structure interaction (FSI) problems where the fluid exhibits a non-Newtonian Viscoelastic behaviour. Oldroyd-B constitutive equation is used to model Viscoelastic fluid. ...
    • 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)
      Conference report
      Restricted access - publisher's policy
      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
      Open Access
      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. ...