Browsing by Author "Lehmkuhl, Oriol"

Now showing items 1-20 of 31

    • A level-set aided single-phase model for the numerical simulation of free-surface flow on unstructured meshes 

      Schillaci, Eugenio; Jofre Cruanyes, Lluís; Balcázar Arciniega, Néstor; Lehmkuhl, Oriol; Oliva Llena, Asensio (Elsevier, 2016-11-25)
      Article
      Open Access
      A new single-phase scheme for the numerical simulation of free-surface problems on 3-D unstructured meshes is presented. The flow field is obtained from the discrete solution of the incompressible Navier-Stokes equations, ...

    • 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 ...

    • Active flow control for external aerodynamics: from micro air vehicles to a full aircraft in stall 

      Lehmkuhl, Oriol; Lozano-Durán, Adrian; Rodríguez Pérez, Ivette María (Institute of Physics (IOP), 2020-04-01)
      Article
      Open Access
      We investigate the aerodynamic performance of active flow control of airfoils and wings using synthetic jets with zero net-mass flow. The study is conducted via wall-resolved and wall-modeled large-eddy simulation using ...

    • Direct numerical simulation of multiphase flows with unstable interfaces 

      Schillaci, Eugenio; Lehmkuhl, Oriol; Antepara Zambrano, Óscar; Oliva Llena, Asensio (Institute of Physics (IOP), 2016-09-01)
      Article
      Open Access
      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 ...

    • Effect of the actuation on the boundary layer of an airfoil at moderate reynolds number 

      Lehmkuhl, Oriol; Rodríguez Pérez, Ivette María; Borrell Pol, Ricard (Springer, 2020)
      Conference report
      Restricted access - publisher's policy
      Synthetic (zero net mass flux) jets are an active flow control technique to manipulate the flow field in wall-bounded and free-shear flows. The fluid necessary to actuate on the boundary layer is intermittently injected ...

    • Effects of the actuation on the boundary layer of an airfoil at Reynolds Number Re = 60000 

      Rodríguez Pérez, Ivette María; Lehmkuhl, Oriol; Borrell Pol, Ricard (Springer-Verlag, 2020-05-29)
      Article
      Restricted access - publisher's policy
      Synthetic (zero net mass flux) jets are an active flow control technique to manipulate the flow field in wall-bounded and free-shear flows. The present paper focuses on the role of the periodic actuation mechanisms on the ...

    • Evaluating the roles of detailed endocardial structures on right ventricular haemodynamics by means of CFD simulations 

      Sacco, Federica; Paun, Bruno; Lehmkuhl, Oriol; Iles, Tinen L.; Iaizzo, Paul A.; Houzeaux, Guillaume; Vázquez, Mariano; Butakoff, Constantine; Aguado-Sierra, Jazmin (Wiley, 2018-09)
      Open Access
      Computational modelling plays an important role in right ventricular (RV) haemodynamic analysis. However, current approaches use smoothed ventricular anatomies. The aim of this study is to characterise RV haemodynamics ...

    • Fluid dynamics and heat transfer in the wake of a sphere 

      Rodríguez Pérez, Ivette María; Lehmkuhl, Oriol; Soria Guerrero, Manel; Gómez, Samuel; Domínguez Pumar, Manuel; Kowalski, Lukasz (2019-04)
      Article
      Open Access
      Direct numerical simulation and large-eddy simulation have been performed for a heated sphere at Reynolds numbers of $Re=1000$ and $Re=10^4$, respectively. The Prandtl number for both simulations has been $Pr=0.7$. ...

    • Large eddy simulation for automotive aerodynamics with Alya 

      Lehmkuhl, Oriol; Chrysokentis, Georgios; Gomez, Samuel; Owen, Herbert (2018-07-09)
      Conference lecture
      Open Access
      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 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 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, Oriol; Rodríguez Pérez, Ivette María; Houzeaux, Guillaume (Elsevier, 2018-09)
      Article
      Open Access
      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 ...

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

      Sacco, Federica; Paun, Bruno; Lehmkuhl, Oriol; Iles, Tinen L.; Iaizzo, Paul A.; Houzeaux, Guillaume; Vázquez, Mariano; Butakoff, Constantine; Aguado-Sierra, Jazmin (Frontiers Media, 2018-04-30)
      Article
      Open Access
      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-based Study of the Roughness Effects on the Wake of a Circular Cylinder from Subcritical to Transcritical Reynolds Numbers 

      Rodriguez, Ivette; Lehmkuhl, Oriol; Piomelli, Ugo; Chiva, Jorge; Borrell, Ricard; Oliva, Assensi (Springer Verlag, 2017-12)
      Article
      Open Access
      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 ...

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

      Both, Ambrus; Lehmkuhl, Oriol; Mira Martínez, Daniel; Ortega, Marc (Elsevier, 2020-03-30)
      Article
      Restricted access - publisher's policy
      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 ...

    • Nasal sprayed particle deposition in a human nasal cavity under different inhalation conditions 

      Calmet, Hadrien; Inthavong, Kiao; Eguzkitza, Beatriz; Lehmkuhl, Oriol; Houzeaux, Guillaume (Public Library of Science, 2019-09-06)
      Article
      Open Access
      Deposition of polydisperse particles representing nasal spray application in a human nasal cavity was performed under transient breathing profiles of sniffing, constant flow, and breath hold. The LES turbulence model was ...

    • Noise Radiated by an Open Cavity at Low Mach Number 

      Martín Navarrete, Rocío; Soria Guerrero, Manel; Lehmkuhl, Oriol; Gorobets, Andrei; Cante Terán, Juan Carlos; Vidal Pairot, Pere (2018)
      Conference report
      Restricted access - publisher's policy
      The present work focuses on the study of noise generation and radiation of unsteady laminar flow over an open three dimensional cavity at low Mach number, that is of interest to understand noise generation mechanisms in ...

    • Noise radiated by an open cavity at low Mach number: Effect of the cavity oscillation mode 

      Martín Navarrete, Rocío; Soria Guerrero, Manel; Lehmkuhl, Oriol; Duben, Alexey; Gorobets, Andrey (2019-09-17)
      Article
      Open Access
      The present work focuses on the study of noise generation and radiation of an infinite open three-dimensional cavity at low Mach number with laminar upstream conditions that is of interest to understand noise generation ...

    • 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 characterization of a technically premixed hydrogen flame under conditions close to flashback 

      Mira Martínez, Daniel; Lehmkuhl, Oriol; Both, Ambrus; Stathopoulos, Panagiotis; Tanneberger, Tom; Reichel, Thoralf G.; Paschereit, Christian Oliver; Vázquez, Mariano; Houzeaux, Guillaume (Springer, 2020-03)
      Article
      Open Access
      This work presents a numerical study of a technically premixed swirling combustor with central air injection at conditions close to flashback using large-eddy simulation with flamelet modelling. This burner has the ...

    • Numerical simulation of roughness effects on the flow past a circular cylinder 

      Rodríguez Pérez, Ivette María; Lehmkuhl, Oriol; Piomelli, Ugo; Chiva Segura, Jorge; Borrell, Ricard; Oliva Llena, Asensio (Institute of Physics (IOP), 2016)
      Conference report
      Open Access
      In the present work large eddy simulations of the flow past a rough cylinder are performed at a Reynolds number of Re = 4.2 × 105 and an equivalent sand-grain surface roughness height ks = 0.02D. In order to determine the ...