Now showing items 21-40 of 41

    • DNS of drag-force and reactive mass transfer in gravity-driven bubbly flows 

      Balcázar Arciniega, Néstor; Antepara Zambrano, Óscar; Rigola Serrano, Joaquim; Oliva Llena, Asensio (2019)
      Conference report
      Restricted access - publisher's policy
    • DNS of falling droplets in a vertical channel 

      Balcázar Arciniega, Néstor; Castro González, Jesús; Chiva Segura, Jorge; Oliva Llena, Asensio (WIT Press, 2018-02-01)
      Article
      Open Access
      This paper presents Direct Numerical Simulation (DNS) of the falling motion of single and multiple deformable drops in a vertical channel. A systematic study of the wall effect on the motion of single drop is performed for ...
    • DNS of Mass Transfer from Bubbles Rising in a Vertical Channel 

      Balcázar Arciniega, Néstor; Rigola Serrano, Joaquim; Oliva Llena, Asensio (Springer, 2019)
      Conference report
      Restricted access - publisher's policy
      This work presents Direct Numerical Simulation of mass transfer from buoyancy-driven bubbles rising in a wall-confined vertical channel, through a multiple markers level-set method. The Navier-Stokes equations and mass ...
    • 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)
      Conference lecture
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    • DNS of the wall effect on the motion of bubble swarms 

      Balcázar Arciniega, Néstor; Castro González, Jesús; Rigola Serrano, Joaquim; Oliva Llena, Asensio (Elsevier, 2017)
      Conference report
      Open Access
      This paper presents a numerical study of the gravity-driven motion of single bubbles and bubble swarms through a vertical channel, using High-Performance Computing (HPC) and Direct Numerical Simulation (DNS) of the ...
    • DNS of Thermocapillary Migration of Deformable Droplets 

      Balcázar Arciniega, Néstor; Antepara Zambrano, Óscar; Rigola Serrano, Joaquim; Oliva Llena, Asensio (Springer Nature, 2019)
      Conference report
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    • DNS of un-equal size droplets collision using a moving-mesh/level-set method 

      Amani, Ahmad; Balcázar Arciniega, Néstor; Gutiérrez Álvarez, Enrique; Oliva Llena, Asensio (2019)
      Conference report
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    • Effectiveness of adaptive mesh refinement strategies in the DNS of multiphase flows 

      Schillaci, Eugenio; Antepara Zambrano, Óscar; Lehmkuhl Barba, Oriol; Balcázar Arciniega, Néstor; Oliva Llena, Asensio (Begell House, 2015)
      Conference report
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      In this work, a finite-volume Adaptive Mesh Refinement (AMR) method for two phase flows able to dynamically achive the required mesh size in specific parts of the domain has been developed. The Navier-Stokes equations for ...
    • 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)
      Conference report
      Restricted access - publisher's policy
      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 ...
    • Level-set simulations of buoyancy-driven motion of single and multiple bubbles 

      Balcázar Arciniega, Néstor; Lehmkuhl Barba, Oriol; Jofre Cruanyes, Lluís; Olivaa, Assensi (2015-12-01)
      Article
      Open Access
      This paper presents a numerical study of buoyancy-driven motion of single and multiple bubbles by means of the conservative level-set method. First, an extensive study of the hydrodynamics of single bubbles rising in a ...
    • Numerical approach to study bubbles and drops evolving through complex geometries by using a level set – Moving mesh – Immersed boundary method 

      Gutiérrez González, Ernesto; Favre, F.; Balcázar Arciniega, Néstor; Amani, Ahmad; Rigola Serrano, Joaquim (2018-10-01)
      Article
      Restricted access - publisher's policy
      The present work proposes a method to study problems of drops and bubbles evolving in complex geometries. First, a conservative level set (CLS) method is enforced to handle the multiphase domain while keeping the mass ...
    • Numerical simulation of incompressible two phase flows by conservative level set method 

      Balcázar Arciniega, Néstor; Jofre Cruanyes, Lluís; Lehmkuhl Barba, Oriol; Rigola Serrano, Joaquim; Castro González, Jesús (Budapest University of Technology and Economics, 2012)
      Conference report
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      A numerical formulation for the Conservative Level-Set Method of Olsson and Kreiss is implemented using the finite volume approach. Both convective term of the interface advection equation and compression term of the ...
    • Numerical simulation of multiphase flows : level-set techniques 

      Balcázar Arciniega, Néstor (Universitat Politècnica de Catalunya, 2014-09-30)
      Doctoral thesis
      Open Access
      This thesis aims at developing numerical methods based on level-set techniques suitable for the direct numerical simulation (DNS) of free surface and interfacial flows, in order to be used on basic research and industrial ...
    • Numerical study of an impulse wave generated by a sliding mass 

      Schillaci, Eugenio; Favre Samarra, Federico; Antepara Zambrano, Óscar; Balcázar Arciniega, Néstor; Oliva Llena, Asensio (WIT Press, 2018)
      Article
      Open Access
      In this work, a numerical framework for the direct numerical simulation of tsunami waves generated by landslide events is proposed. The method, implemented on the TermoFluids numerical platform, adopts a free surface model ...
    • Numerical study of binary droplets collision in the main collision regimes 

      Amani, Ahmad; Balcázar Arciniega, Néstor; Gutiérrez Álvarez, Enrique; Oliva Llena, Asensio (2019-08-15)
      Article
      Restricted access - publisher's policy
      Direct numerical simulation of binary droplets collision is done using a conservative level-set method. The Navier-Stokes and level-set equations are solved using a finite-volume method on collocated grids. A novel lamella ...
    • Numerical study of droplet deformation in shear flow using a conservative level-set method 

      Amani, Ahmad; Balcázar Arciniega, Néstor; Castro González, Jesús; Oliva Llena, Asensio (2019-11-02)
      Article
      Restricted access - publisher's policy
      This paper is concerned with a numerical study on the behavior of a single Newtonian droplet suspended in another Newtonian fluid, all subjected to a simple shear flow. Conservative finite-volume approximation on a collocated ...
    • Numerical study of rising bubbles with path instability using conservative level-set and adaptive mesh refinement 

      Antepara Zambrano, Óscar; Balcázar Arciniega, Néstor; Rigola Serrano, Joaquim; Oliva Llena, Asensio (Elsevier, 2019-06-15)
      Article
      Restricted access - publisher's policy
      This paper focuses on three-dimensional direct numerical simulations of rising bubbles in the wobbling regime, and the study of its dynamical behavior for Eötvös number 1  ≤  Eo  ≤  10 and Morton number 1e−11  ≤ M ≤  1e−9. ...
    • Numerical study of Taylor bubbles rising in a stagnant liquid using a level-set/moving-mesh method 

      Gutiérrez González, Ernesto; Balcázar Arciniega, Néstor; Bartrons Casademont, Eduard; Rigola Serrano, Joaquim (2017-06-08)
      Article
      Open Access
      An Arbitrary Lagrangian-Eulerian formulation has been posed to solve the challenging problem of the three-dimensional Taylor bubble, within a Conservative Level Set (CLS) framework. By employing a domain optimization method ...
    • Numerical study of the incompressible Richtmyer-Meshkov instability. Interface tracking methods on general meshes 

      Jofre Cruanyes, Lluís; Balcázar Arciniega, Néstor; Lehmkuhl Barba, Oriol; Castro González, Jesús; Oliva Llena, Asensio (2012)
      Conference report
      Open Access
      The numerical simulation of interfacial and free surface flows 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 ...
    • On the solution of the full three-dimensional Taylor bubble problem by using a coupled Conservative Level Set - Moving Mesh method 

      Gutiérrez Álvarez, Enrique; Balcázar Arciniega, Néstor; Lehmkuhl Barba, Oriol; Oliva Llena, Asensio (Institute of Physics (IOP), 2016)
      Conference report
      Open Access
      The challenging problem of the full three-dimensional Taylor bubble has been addressed by using a Conservative Level Set method in order to deal with the multiphase flow. A moving mesh is used, aiming to optimize the ...