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    • Direct numerical simulation from 3d imaging 

      Zhao, J.X.; Decencière, E.; Coupez, T.; Silva, L. (CIMNE, 2015)
      Text en actes de congrés
      Accés obert
      In the last decade, the finite element method has shown to be a powerful and accurate computational tool to deal with material behavior and fluid-structure interaction simulations, with the increase on the computational ...

    • Direct numerical simulation of a differentially heated cavity of aspect ratio 4 with Rayleigh numbers up to 10(11) - Part I: Numerical methods and time-averaged flow 

      Trias Miquel, Francesc Xavier; Gorobets, Andrei; Soria Guerrero, Manel; Oliva Llena, Asensio (2010-01-31)
      Article
      Accés restringit per política de l'editorial
      A set of direct numerical simulations of a differentially heated cavity of aspect ratio 4 with adiabatic horizontal walls is presented. The five configurations selected here (Rayleigh numbers based on the cavity height ...

    • Direct numerical simulation of a differentially heated cavity of aspect ratio 4 with Rayleigh numbers up to 10(11) - Part II: Heat transfer and flow dynamics 

      Trias Miquel, Francesc Xavier; Gorobets, Andrei; Soria Guerrero, Manel; Oliva Llena, Asensio (2010-01-31)
      Article
      Accés restringit per política de l'editorial
      This is the second of a two-part paper on five direct numerical simulations of a differentially heated cavity of aspect ratio 4 with adiabatic horizontal walls (Rayleigh numbers based on the cavity height. The numerical ...

    • Direct numerical simulation of a fully developed turbulent square duct flow up to Re-tau=1200 

      Zhang, Hao; Trias Miquel, Francesc Xavier; Gorobets, Andrei; Tan, Yuanqiang; Oliva Llena, Asensio (2015-08-01)
      Article
      Accés obert
      Various fundamental studies based on a turbulent duct flow have gained popularity including heat transfer, magnetohydrodynamics as well as particle-laden transportation. An accurate prediction on the turbulent flow field ...

    • Direct numerical simulation of a NACA0012 in full stall 

      Rodríguez Pérez, Ivette María; Lehmkuhl Barba, Oriol; Borrell Pol, Ricard; Oliva Llena, Asensio (2013-10-15)
      Article
      Accés obert
      This work aims at investigating the mechanisms of separation and the transition to turbulence in the separated shear-layer of aerodynamic profiles, while at the same time to gain insight into coherent structures formed ...

    • Direct numerical simulation of backward-facing step flow at Ret = 395 and expansion ratio 2 

      Pont Vilchez, Arnau; Trias Miquel, Francesc Xavier; Gorobets, Andrei; Oliva Llena, Asensio (2019-03-25)
      Article
      Accés obert
      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 evaporative cooling at the lateral boundary of shallow cumulus clouds 

      Abma, Dick; Heus, Thijs; Mellado González, Juan Pedro (2013-07-23)
      Article
      Accés obert
      This study investigates the dynamics of the subsiding shell at the lateral boundary of cumulus clouds, focusing on the role of evaporative cooling. Since the size of this shell is well below what large-eddy simulations can ...

    • Direct numerical simulation of free convection over a heated plate 

      Mellado González, Juan Pedro (2012-12-10)
      Article
      Accés obert
      Direct numerical simulations of free convection over a smooth, heated plate are used to investigate unbounded, unsteady turbulent convection. Four different boundary conditions are considered: free-slip or no-slip walls, ...

    • Direct numerical simulation of laminar and turbulent Rayleigh-Bénard convection 

      Dabbagh, Firas (Universitat Politècnica de Catalunya / Universitat de Barcelona, 2013-06)
      Projecte Final de Màster Oficial
      Accés obert
      The main aim of this work is understanding the phenomenon of B enard cells in laminar and turbulent regimes as an application of studying the air flow in the air gap and honey comb cells that installed in the flat plate ...

    • Direct numerical simulation of multi-phase flow in complex media 

      Hashemi, Mohammad Reza (Universitat Politècnica de Catalunya, 2022-02-22)
      Tesi
      Accés obert
      In numerous applications, two-phase liquid-gas transport at sub-millimeter length scales plays a substantial role in the determination of the behavior of the system at hand. As its main application, the present work focuses ...

    • Direct numerical simulation of multiphase flows with unstable interfaces 

      Schillaci, Eugenio; Lehmkuhl Barba, Oriol; Antepara Zambrano, Óscar; Oliva Llena, Asensio (Institute of Physics (IOP), 2016-09-01)
      Article
      Accés obert
      This paper presents a numerical model that intends to simulate efficiently the surface instability that arise in multiphase flows, typically liquid-gas, both for laminar or turbulent regimes. The model is developed on the ...

    • Direct numerical simulation of rising bubble with path instability 

      Antepara Zambrano, Óscar; Balcázar Arciniega, Néstor; Rigola Serrano, Joaquim; Oliva Llena, Asensio (2018)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Present research is focused on combining High- Performance Computing (HPC) and Direct Numerical Simulation (DNS) of two-phase flows, to study the dy- namic behavior of rising bubble whit path instabilities with moderate/high ...

    • Direct Numerical Simulation of the flow over a sphere at Re = 3700 

      Rodríguez Pérez, Ivette María; Borrell Pol, Ricard; Lehmkuhl Barba, Oriol; Oliva Llena, Asensio; Pérez Segarra, Carlos David (2009)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      The direct numerical simulation of the flow past a sphere at Re=3700 is presented. The computations are carried out with a parallel unstructured symmetry preserving information for accurate solving complex geometries. As ...

    • Direct numerical simulation of the flow over a sphere at Re = 3700 

      Rodríguez Pérez, Ivette María; Borrell Pol, Ricard; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2011-05-19)
      Article
      Accés restringit per política de l'editorial
      The direct numerical simulation of the flow over a sphere is performed. The computations are carried out in the sub-critical regime at Re = 3700 (based on the free-stream velocity and the sphere diameter). A parallel ...

    • Direct numerical simulation of the flow over a spherical bubble in a turbulent pipe flow 

      Jofre Cruanyes, Lluís; Balcázar Arciniega, Néstor; Lehmkuhl Barba, Oriol; Borrell Pol, Ricard; Castro González, Jesús (International Association for Computational Mechanics (IACM), 2014)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This work aims at investigating, by means of a direct numerical simulation, the flow over a clean spherical bubble fixed on the axis of a turbulent pipe flow. The simulation is performed by means of a parallel unstructured ...

    • Direct Numerical Simulation of the turbulent flow around a NACA 0012 airfoil at different angles of attack 

      Baez Vidal, Aleix; Lehmkuhl Barba, Oriol; Rodríguez Pérez, Ivette María; Pérez Segarra, Carlos David (2011)
      Text en actes de congrés
      Accés obert
      Direct numerical simulations (DNS) of the flow dynamics over a NACA 0012 airfoil at Reynolds number Re = 5×104 at different angles of attack are presented. The dynamic of the large separation bubble, characterised by laminar ...

    • Direct numerical simulation of the turbulent natural convection flow in an open cavity of aspect ratio 4 

      Chiva Segura, Jorge; Lehmkuhl Barba, Oriol; Borrell Pol, Ricard; Oliva Llena, Asensio (Begell House, 2012)
      Text en actes de congrés
      Accés obert
      In this paper, three-dimensional turbulent natural convection heat transfer in an open cavity with an isothermal wall facing the overture has been studied. The aspect ratio chosen for the cavity has been 4 to complement the ...

    • 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)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      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 ...

    • Direct numerical simulation of turbulent wakes: flow past a sphere at Re=5000 

      Rodríguez Pérez, Ivette María; Lehmkuhl Barba, Oriol; Borrell Pol, Ricard; Oliva Llena, Asensio; Pérez Segarra, Carlos David (2010)
      Text en actes de congrés
      Accés obert
      The flow around bluff bodies is of great interest for a large number of engineering applications such as vehicle aerodynamics, cooling devices using forced convection, heat transfer enhancement using droplets, among ...

    • Direct numerical simulation of viscoplastic-type non-Newtonian fluid flows in stenosed arteries 

      Carmona Muñoz, Ángel; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The aim of this work is to provide DNS solutions for turbulence flows of viscoplastic-type non-Newtonian fluids and thus contribute to gain insight into the underlying physics of the non-Newtonian turbulent flows. This ...