Exploració per autor "Lehmkuhl Barba, Oriol"Més informació

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    • Large eddy simulation for automotive aerodynamics with Alya 

      Lehmkuhl Barba, Oriol; Chrysokentis, Georgios; Gomez, Samuel; Owen, Herbert (2018-07-09)
      Comunicació de congrés
      Accés obert
      The prodigious potential offered by the ever-growing computing infrastructure is fostering the use of large eddy simulation for automotive aerodynamics. This approach, which resolves the larger dynamically important eddies ...

    • Large eddy simulation model assessment of the turbulent flow through dynamic compressor valves 

      Estruch Pérez, Olga; Lehmkuhl Barba, Oriol; Rigola Serrano, Joaquim; Oliva Llena, Asensio; Pérez Segarra, Carlos David (2013)
      Text en actes de congrés
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      The present paper attempts the dynamic simulation of the fluid flow through the valve reed taking into account valve movement due to piston displacement. This work widens previous studies based on numerical experiments ...

    • Large eddy simulation of a turbulent diffusion flame: some aspects of subgrid modelling consistency 

      Ventosa Molina, Jordi; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2017-04-26)
      Article
      Accés obert
      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 a turbulent jet diffusion flame using the Flamelet-Progress Variable model 

      Ventosa, Jordi; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2013)
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      In this work an hydrogen enriched methane flame in a non-premixed configuration is studied, which corresponds to the DLR flame A. Large Eddy Simulation (LES) will be used to numerically analyse the case. Unstructured meshes ...

    • Large Eddy Simulation of airflow in a single family house 

      Mohan Damle, Rashmin; Soria Guerrero, Manel; Lehmkuhl Barba, Oriol; Colomer Rey, Guillem; Oliva Llena, Asensio (2010)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      This work is addressed to contribute to the progress in the determination of indoor air flow in buildings. The air flow in such environments is caused by natural convection, stack and wind effects, infiltration of ambient ...

    • 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)
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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)
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    • Large-eddy simulations of the flow on an aerofoil with leading-edge imperfections 

      Kumar, Vishal; Piomelli, Ugo; Lehmkuhl Barba, Oriol (Taylor and Francis, 2021)
      Article
      Accés obert
      We performed large-eddy simulations of the flow over an aerofoil to understand the effects of leading-edge roughness designed to mimic ice accretion. The roughness elements protrude outside the boundary layer, which, near ...

    • Large-eddy simulations of the vortex-induced vibration of a low mass ratio two-degree-of-freedom circular cylinder at subcritical Reynolds numbers 

      Pastrana Maldonado, Daniel; Cajas García, Juan Carlos; Lehmkuhl Barba, Oriol; Rodríguez Pérez, Ivette María; Houzeaux, Guillaume (Elsevier, 2018-09)
      Article
      Accés obert
      The vortex induced vibration phenomenon of a low mass ratio () two-degree-of-freedom circular cylinder at subcritical Reynolds numbers ( 5300, 11,000) has been investigated by means of large-eddy simulations. A low-dissipative ...

    • Large-eddy simulations of turbulent flow around a wall-mounted cube using an adaptive mesh refinement approach 

      Antepara Zambrano, Óscar; Lehmkuhl Barba, Oriol; Oliva Llena, Asensio; Favre, Federico (2013)
      Text en actes de congrés
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      In the present work two LES models for predicting turbulent flow and an Adaptive Mesh Refinement (AMR) technique are proposed and tested for a fully 3D geometry: turbulent flow around a wall-mounted cube at Reh=7235. The ...

    • Large-scale coherent structures in an asymmetrically heated channel flow 

      García Berenguer, Marina; Silva, Lucas Gasparino Ferreira da; Lehmkuhl Barba, Oriol; Rodríguez Pérez, Ivette María (European Research Community on Flow, Turbulence, and Conbustion (ERCOFTAC), 2023)
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      A compressible direct numerical simulation (DNS) has been conducted to analyze the behavior of low-speed flows submitted to a strong temperature gradient in a fully developed and asymmetrically heated turbulent channel ...

    • Left Ventricular Trabeculations Decrease the Wall Shear Stress and Increase the Intra-Ventricular Pressure Drop in CFD Simulations 

      Sacco, Federica; Paun, Bruno; Lehmkuhl Barba, Oriol; Iles, Tinen L.; Iaizzo, Paul A.; Houzeaux, Guillaume; Vázquez, Mariano; Butakoff, Constantine; Aguado-Sierra, Jazmin (Frontiers Media, 2018-04-30)
      Article
      Accés obert
      The aim of the present study is to characterize the hemodynamics of left ventricular (LV) geometries to examine the impact of trabeculae and papillary muscles (PMs) on blood flow using high performance computing (HPC). ...

    • LES study of the impact of fuel composition on a swirl spray flame approaching blow-off 

      Both, Ambrus; Mira Martínez, Daniel; Lehmkuhl Barba, Oriol (2021)
      Comunicació de congrés
      Accés obert
      The present paper focuses on the large eddy simulation (LES) of the n-heptane and n-dodecane flames of the Cambridge swirl flames data repository (Sidey et al., 2017). The applied tabulated chemistry spray combustion model ...

    • LES-based Study of the Roughness Effects on the Wake of a Circular Cylinder from Subcritical to Transcritical Reynolds Numbers 

      Rodriguez, Ivette; Lehmkuhl Barba, Oriol; Piomelli, Ugo; Chiva, Jorge; Borrell, Ricard; Oliva, Assensi (Springer Verlag, 2017-12)
      Article
      Accés obert
      This paper investigates the effects of surface roughness on the flow past a circular cylinder at subcritical to transcritical Reynolds numbers. Large eddy simulations of the flow for sand grain roughness of size k/D = 0.02 ...

    • LES-based study of the roughness effects on the wake of a circular cylinder from subcritical to transcritical Reynolds numbers 

      Rodríguez Pérez, Ivette María; Lehmkuhl Barba, Oriol; Piomelli, Ugo; Chiva Segura, Jorge; Borrell Pol, Ricard; Oliva Llena, Asensio (2017-10-27)
      Article
      Accés obert
      This paper investigates the effects of surface roughness on the flow past a circular cylinder at subcritical to transcritical Reynolds numbers. Large eddy simulations of the flow for sand grain roughness of size k/D = 0.02 ...

    • 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
      Accés obert
      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 ...

    • Limits of the Oberbeck–Boussinesq approximation in a tall differentially heated cavity filled with water 

      Kizildag, Deniz; Rodríguez Pérez, Ivette María; Oliva Llena, Asensio; Lehmkuhl Barba, Oriol (2014-01-01)
      Article
      Accés obert
      The present work assesses the limits of the Oberbeck–Boussinesq (OB) approximation for the resolution of turbulent fluid flow and heat transfer inside a tall differentially heated cavity of aspect ratio G = 6.67 filled ...

    • 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)
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      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 ...

    • Low-dissipation finite element strategy for low Mach number reacting flows 

      Both, Ambrus; Lehmkuhl Barba, Oriol; Mira Martínez, Daniel; Ortega, Marc (Elsevier, 2020-03-30)
      Article
      Accés obert
      The present paper extends the conservative finite element convective scheme proposed by Charnyi et al.(Journal of Computational Physics 337, 2017, 289–308) originally formulated for incompressible flows to the low Mach ...

    • Low-frequency unsteadiness in the vortex formation region of a circular cylinder 

      Lehmkuhl Barba, Oriol; Rodríguez Pérez, Ivette María; Borrell Pol, Ricard; Oliva Llena, Asensio (2013-08-23)
      Article
      Accés obert
      The presence of low-frequency fluctuations in the wake of bluff bodies have been observed in several investigations. Even though the flow past a circular cylinder at Re = 3900 (Re = U ref D/ν) has been the object of several ...