Now showing items 1-20 of 23

  • A low-dissipation finite element scheme for scale resolving simulations of turbulent flows 

    Lehmkuhl, Oriol; Houzeaux, Guillaume; Owen, Herbert; Chrysokentis, Giorgios; Rodríguez Pérez, Ivette María (2019-08-01)
    Article
    Restricted access - publisher's policy
    The present work extends the conservative convective scheme proposed by Charnyi et al. (2017) [13], originally formulated for mixed finite elements and tested in laminar flows, to equal order finite elements. A non-incremental ...
  • A new statistical model for subgrid dispersion in large eddy simulations of particle-laden flows 

    Muela Castro, Jordi; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David; Oliva Llena, Asensio (Institute of Physics (IOP), 2016)
    Conference report
    Open Access
    Dispersed multiphase turbulent flows are present in many industrial and commercial applications like internal combustion engines, turbofans, dispersion of contaminants, steam turbines, etc. Therefore, there is a clear interest ...
  • Building a new subgrid characteristic length for LES 

    Trias Miquel, Francesc Xavier; Gorobets, Andrey; Duben, Alexey; Oliva Llena, Asensio (Keldysh Institute of Applied Mathematics, 2016)
    Conference report
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  • Building proper invariants for subgrid-scale eddy-viscosity models 

    Trias Miquel, Francesc Xavier; Folch, David; Gorobets, Andrei; Oliva Llena, Asensio (2015)
    Conference report
    Restricted access - publisher's policy
    Since direct simulations of the incompressible Navier-Stokes equations are limited to relatively low-Reynolds numbers, dynamically less complex mathematical formulations are necessary for coarse-grain simulations. ...
  • Direct and large eddy simulations of non-Oberbeck-Boussinesq effects in a turbulent tall water-filled differentially heated cavity 

    Kizildag, Deniz; Rodríguez Pérez, Ivette María; Trias Miquel, Francesc Xavier; Oliva Llena, Asensio (2015)
    Conference report
    Restricted access - publisher's policy
    The present work first submits to investigation the non-Oberbeck-Boussinesq (NOB) effects in a tall water-filled differentially heated cavity by means of direct numerical simulations. The results reveal that if NOB effects ...
  • Direct numerical simulation of backward-facing step flow at Ret = 395 and expansion ratio 2 

    Pont Vilchez, Arnau; Trias Miquel, Francesc Xavier; Gorobets, Andrey; Oliva Llena, Asensio (2019-03-25)
    Article
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    Backward-facing step (BFS) constitutes a canonical configuration to study wallbounded flows subject to massive expansions produced by abrupt changes in geometry. Recirculation flow regions are common in this type of flow, ...
  • Direct numerical simulation of turbulent flows with parallel algorithms for various computing architectures 

    Gorobets, Andrei; Trias Miquel, Francesc Xavier; Borrell Pol, Ricard; Oyarzun Altamirano, Guillermo; Oliva Llena, Asensio (International Association for Computational Mechanics (IACM), 2014)
    Conference report
    Restricted access - publisher's policy
    The purpose of the work is twofold. Firstly, it is devoted to the development of efficient parallel algorithms for large-scale simulations of turbulent flows on different supercomputer architectures. It reports experience ...
  • DNS of a Backward-Facing Step at high Reynolds number. Towards a better understanding of RANS-LES transition in DES models 

    Pont Vilchez, Arnau; Trias Miquel, Francesc Xavier; Oliva Llena, Asensio (2018)
    Conference report
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    A DNS of an incompressible fluid flow over a Backward Facing Step (BFS ) with an Expansion Ratio (ER ) equal to 2, ER = H/(H - h), has been performed. Where h and H represent the step and the outlet heights, respectively. ...
  • Drag reduction via turbulent boundary layer flow control 

    Abbas, Adel; Bugeda Castelltort, Gabriel; Ferrer Vaccarezza, Esteban; Fu, Song; Periaux, Jacques Francis; Pons Prats, Jordi; Valero, Eusebio; Zheng, Yao (2017-09)
    Article
    Open Access
    Turbulent boundary layer control (TBLC) for skin-friction drag reduction is a relatively new technology made possible through the advances in computational-simulation capabilities, which have improved the understanding of ...
  • HPC² - A fully-portable, algebra-based framework for heterogeneous computing. Application to CFD 

    Álvarez Farré, Xavier; Gorobets, Andrey; Trias Miquel, Francesc Xavier; Borrell Pol, Ricard; Oyarzun Altamirano, Guillermo (Elsevier, 2018-09)
    Article
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    The variety of computing architectures competing in the exascale race makes the portability of codes of major importance. In this work, the HPC2 code is presented as a fully-portable, algebra-based framework suitable for ...
  • 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
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    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 ...
  • Large-eddy simulation of turbulent dynamic fluid-structure interaction 

    Estruch Pérez, Olga; Lehmkuhl Barba, Oriol; Borrell Pol, Ricard; Pérez Segarra, Carlos David (Begell House, 2012)
    Conference report
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  • Numerical simulation of turbulence at lower costs: regularization modeling 

    Trias Miquel, Francesc Xavier; Gorobets, Andrei; Soria Guerrero, Manel; Oliva Llena, Asensio (2011)
    Conference lecture
    Restricted access - publisher's policy
    This work is devoted to the development of efficient methods for the numerical simulation of incompressible flows on modern supercomputers. Direct simulation of the Navier-Stokes equations is nowadays an essential tool ...
  • On the blending of regularization and large-eddy simulation 

    Folch, David; Trias Miquel, Francesc Xavier; Gorobets, Andrei; Oliva Llena, Asensio (International Association for Computational Mechanics (IACM), 2014)
    Conference report
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    Direct simulations of the incompressible Navier-Stokes equations at high Reynolds numbers are not feasible because the convective term produces far too many relevant scales of motion. Therefore, in the foreseeable future, ...
  • On the effects of free-stream turbulence intensity in the fluid flow and heat transfer from a sphere at subcritical Reynolds numbers 

    Rodríguez Pérez, Ivette María; Lehmkuhl, Oriol; Soria Guerrero, Manel; Gomez, Samuel; Domínguez Pumar, Manuel; Kowalski, Lukasz (2018)
    Conference lecture
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    In this work, the effect of the free-stream turbu-lence on the heat transfer and the near wake behind a sphere is studied at moderate Reynolds numbers of ¿¿ ¿ ¿¿¿¿ and ¿¿ ¿ ¿¿¿. Turbulence delays the sep-aration of the ...
  • On the role of a centrifugal instability in the vortex-induced vibration of a two-degrees of freedom circular cylinder at moderate Reynolds numbers 

    Pastrana, Daniel; Cajas García, Juan Carlos; Lehmkuhl, Oriol; Rodríguez Pérez, Ivette María; Vázquez, Mariano; Houzeaux, Guillaume (2018)
    Conference report
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    In this work, the formation and role of a centrifugal instability in the VIV phenomenon at moderate Reynolds numbers are investigated for the ¿rst time. Large eddy simulations of a low mass ratio (m = 2.6) two-degree-of-freedom ...
  • Parallel adaptive mesh refinement for large-eddy simulations of turbulent flows 

    Antepara Zambrano, Óscar; Lehmkuhl Barba, Oriol; Borrell Pol, Ricard; Chiva Segura, Jorge; Oliva Llena, Asensio (Elsevier, 2015-03-30)
    Article
    Open Access
    In this paper a parallel adaptive mesh refinement (AMR) strategy for large eddy simulations (LES) of turbulent flows is presented. The underlying discretization of the Navier-Stokes equations is based on a finite-volume ...
  • Parallel mesh multiplication and adaptation technique for turbulent flow simulation using unstructured meshes 

    Antepara Zambrano, Óscar; Lehmkuhl Barba, Oriol; Borrell Pol, Ricard; Oliet Casasayas, Carles; Oliva Llena, Asensio (2015)
    Conference report
    Restricted access - publisher's policy
    In this paper, we report the development of a parallel mesh multiplication code to subdivide a base mesh (containing tetrahedral, pyramids, prisms or hexahedral) into a finer mesh without user intervention, taking care of ...
  • Spectrally-Consistent Regularization of Navier–Stokes Equations 

    Trias Miquel, Francesc Xavier; Folch Flórez, David; Gorobets, A.; Oliva Llena, Asensio (2019-05)
    Article
    Restricted access - publisher's policy
    The incompressible Navier–Stokes equations form an excellent mathematical model for turbulent flows. However, direct simulations at high Reynolds numbers are not feasible because the convective term produces far too many ...
  • Study for the validation of Code Saturne for turbulent flow simulations 

    Amat Foraster, Jordi (Universitat Politècnica de Catalunya, 2017-06)
    Bachelor thesis
    Open Access
    Nowadays, turbulent flows are of great interest in many applications because they mix fluid much more effectively than a comparable laminar flow due to its diffusivity. The conservation of the properties of the Navier-Stokes ...