Now showing items 1-7 of 7

  • Comparative study of subfilter scalar dissipation rate and mixture fraction variance models 

    Ventosa Molina, Jordi; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David; Muela Castro, Jordi; Oliva Llena, Asensio (2014)
    Conference report
    Restricted access - publisher's policy
    Accurate characterisation of mixing at the subfilter level is a critical aspect in many LES combustion models, such as flamelet based and Conditional Moment Closure models. Several models can be found in the literature, ...
  • Large eddy simulation of a turbulent diffusion flame: some aspects of subgrid modelling consistency 

    Ventosa Molina, Jordi; Lehmkuhl, Oriol; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2017-04-26)
    Article
    Open Access
    In the context of Large Eddy Simulation (LES) solely for the momentum transport equation there may be found several models for the turbulent subgrid fluxes. Furthermore, among those relying on the eddy diffusivity approach, ...
  • Large eddy simulation of hydrogen autoignition in a preheated turbulent co-flow 

    Muela Castro, Jordi; Lehmkuhl Barba, Oriol; Oliva Llena, Asensio; Ventosa Molina, Jordi (2013)
    Conference report
    Restricted access - publisher's policy
    The autoignition process of a hydrogen jet into a preheated turbulent air stream is numerically studied. A Progress-variable (PV) model with the turbulence-chemistry interactions modelled using a Presumed Conditional Moment ...
  • Low Mach Navier-Stokes equations on unstructured meshes 

    Ventosa Molina, Jordi; Chiva Segura, Jorge; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2012)
    Conference report
    Restricted access - publisher's policy
    Numerical methods for fluxes with strong density variations but with speeds much lower than the sound speed, known as low Mach flows, present some particularities with respect to incompressible formulations. Despite ...
  • Numerical analysis of conservative unstructured discretisations for low Mach flows 

    Ventosa Molina, Jordi; Chiva Segura, Jorge; Lehmkuhl, Oriol; Muela Castro, Jordi; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2016-12-01)
    Article
    Open Access
    Unstructured meshes allow easily representing complex geometries and to refine in regions of interest without adding control volumes in unnecessary regions. However, numerical schemes used on unstructured grids have to ...
  • Numerical simulation of turbulent diffusion flames using flamelet models on unstructured meshes 

    Ventosa Molina, Jordi (Universitat Politècnica de Catalunya, 2015-10-02)
    Doctoral thesis
    Open Access
    The present thesis aims at developing numerical methods and algorithms for the efficient simulation of diffusion flames in the flamelet regime. To tackle turbulent chemically reacting flows a double framework is used in ...
  • Towards a direct numerical simulation of a lifted CH4-air diffusion flame 

    Ventosa Molina, Jordi; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David; Oliva Llena, Asensio (Begell House, 2015)
    Conference report
    Restricted access - publisher's policy
    The near field jet of a self-igniting methane-air diffusion jet flame is studied by means of Direct Numerical Simulation (DNS) and a Flamelet/Progress-Variable (FPV) model to include detailed chemistry. Hence, all flow and ...