Exploració per tema "LES"

Ara es mostren els items 1-20 de 51

    • A machine learning based wall model for LES of turbulent flows 

      Radhakrishnan, Sarath; Lehmkuhl Barba, Oriol (Barcelona Supercomputing Center, 2021-05)
      Text en actes de congrés
      Accés obert
      The trubulent flow of fluids is still an enigma for mathematicians and engineers alike. The partial differential equation that reperesents the flow of fluids does not have an analytical solution for turbulent regimes. ...

    • 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)
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      Accés obert
      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 ...

    • Advanced study for the numerical resolution of the Navier-Stokes equations. Application to thermal energy storage systems 

      Sanmartí Perona, Oriol (Universitat Politècnica de Catalunya, 2022-07-19)
      Projecte Final de Màster Oficial
      Accés obert
      The resolution of the Navier Stokes equations in three dimensions in a turbulent regime applying turbulence models is studied. To accomplish this objective, it is done a brief introduction to the work done on the Final ...

    • Air distribution in street canyons: a CFD study 

      García Moreno, Pau (Universitat Politècnica de Catalunya, 2021-06-22)
      Treball Final de Grau
      Accés obert

    • An efficient two-layer wall model for high Reynolds number large eddy simulation 

      Calafell Sandiumenge, Joan; Trias Miquel, Francesc Xavier; Oliva Llena, Asensio (International Centre for Numerical Methods in Engineering (CIMNE), 2018)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Wall-bounded flows at high Reynolds number are an important research field given that they are present in many important industrial applications. Nonetheless, the use of accurate numerical methodologies such as Large Eddy ...

    • An Energy-preserving unconditionally stable fractional step method for DNS/LES on collocated unstructured grids 

      Santos Serrano, Daniel; Trias Miquel, Francesc Xavier; Colomer Rey, Guillem; Oliva Llena, Asensio (Springer, 2022)
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      Accés restringit per política de l'editorial
      A finite-volume discretization over unstructured meshes is the most used formulation to solve Navier-Stokes equations by many general purpose CFD packages codes such as OpenFOAM or ANSYS-Fluent.

    • Análisis numérico 3D de una rotura de presa utilizando el método VOF y el modelo de turbulencia LES 

      Sánchez Cordero, Esteban; Boix, Júlia; Gómez Valentín, Manuel; Bladé i Castellet, Ernest (2018-07)
      Article
      Accés obert
      El presente trabajo muestra un análisis numérico 3D del comportamiento del flujo de agua en una rotura de presa a escala de laboratorio. La simulación se realizó utilizando el software de dinámica de fluidos computacional ...

    • Benchmark on the Aerodynamics of a 5:1 Cylinder using NEK5000 

      Timilsina, Poojan (Universitat Politècnica de Catalunya, 2015-02-15)
      Treball Final de Grau
      Accés obert
      Realitzat a/amb:   Università di Pisa / Università di Pisa
      During this decade, the interest in the aerodynamics around a steady rectangular cylinder has grown up so vastly that various researchers and scientist working on bluff body aerodynamics contributed to the Benchmark on the ...

    • Building a proper tensor-diffusivity model for large-eddy simulation of buoyancy-driven flows 

      Trias Miquel, Francesc Xavier; Dabbagh, Firas; Gorobets, Andrei; Oliva Llena, Asensio (International Centre for Numerical Methods in Engineering (CIMNE), 2018)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this work, we plan to shed light on the following research question: can we ¿nd a nonlinear tensorial subgrid-scale (SGS) heat ¿ux model with good physical and numerical properties, such that we can obtain satisfactory ...

    • Data-driven wall modeling for Large Eddy Simulation of non-equilibrium flows: preliminary studies 

      Radhakrishnan, Sarath; Lehmkuhl Barba, Oriol (Parallel Computational Fluid Dynamics (ParCFD), 2022)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The availability of high fidelity data due to the recent developments in high-performance computing(HPC), has opened new doors for wall modeling in Large Eddy Simulation(LES). By augmenting the physics-based model with ...

    • Discovering new scaling laws in turbulent boundary layers via multi-expression programming 

      Simó Muñoz, Irene (Universitat Politècnica de Catalunya, 2022-07-18)
      Treball Final de Grau
      Accés obert
      Flow turbulence modeling is an expensive computational operation that is often run with simulations using physical simplifications to reduce the cost. Large-eddy simulations (LES) of turbulent flow often make use of wall ...

    • DNS and LES on unstructured grids: playing with matrices to preserve symmetries using a minimal set of algebraic kernels 

      Trias Miquel, Francesc Xavier; Álvarez Farré, Xavier; Alsalti Baldellou, Àdel; Gorobets, Andrei; Oliva Llena, Asensio (Scipedia, 2022)
      Text en actes de congrés
      Accés obert
      The essence of turbulence are the smallest scales of motion. They result from asubtle balance between two differential operators differing in symmetry: The convective operator is skew-symmetric, whereas the diffusive is ...

    • DNS/LES using a minimal set of algebraic Kernels: challenges and opportunities 

      Trias Miquel, Francesc Xavier; Álvarez Farré, Xavier; Alsalti Baldellou, Àdel; Gorobets, Andrei; Oliva Llena, Asensio (Parallel Computational Fluid Dynamics (ParCFD), 2022)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In the last decades, CFD has become a standard design tool in many fields such as automotive, aeronautical and wind power industries. The driven force behind this is the development of numerical techniques in conjunction ...

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

      Rodríguez Pérez, Ivette María; Lehmkuhl Barba, Oriol; Borrell Pol, Ricard (Springer-Verlag, 2020-05-29)
      Article
      Accés obert
      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 ...

    • Evaluation of enhanced gray area mitigation approaches based on jet aeroacoustics 

      Duben, Alexey; Ruano Pérez, Jesús; Gorobets, Andrei; Rigola Serrano, Joaquim; Trias Miquel, Francesc Xavier (2023-02)
      Article
      Accés obert
      An investigation of various eddy viscosity models for accurate scale-resolving simulation of aerodynamics and aeroacoustics of a turbulent jet is presented. The models are considered from the perspective of solving the ...

    • Flow topology and heat transfer analysis of slotted and axisymmetric synthetic impinging jets 

      Miró Jané, Arnau; Soria Guerrero, Manel; Cajas García, Juan Carlos; Rodríguez Pérez, Ivette María; Moulinec, Charles (2021-06)
      Article
      Accés obert
      This work is focused on exploring the flow and heat transfer capabilities for slotted and axisymmetric cavity configurations for synthetic impinging jets; the jet is enclosed between two isothermal parallel plates, impinging ...

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

      Rodríguez Pérez, Ivette María; Lehmkuhl Barba, Oriol; Soria Guerrero, Manel; Gómez, Samuel; Domínguez Pumar, Manuel; Kowalski, Lukasz (2019-04)
      Article
      Accés obert
      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 $Pr=0.7$. ...

    • Fluid-structure interaction of a reed type valve 

      González Acedo, Ignacio; Lehmkuhl Barba, Oriol; Naseri, Alireza; Rigola Serrano, Joaquim; Oliva Llena, Asensio (Purdue University, 2016)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      This paper presents a complete numerical procedure to study the fluid-structure interaction problem of incompressible flow through reed valves, typically employed in hermetic reciprocating compressors. A partitioned ...

    • Implementation of a turbulence model for the Vortex Cloud Method 

      Faus Dexeus, Francisco Javier (Universitat Politècnica de Catalunya, 2022-06-21)
      Projecte Final de Màster Oficial
      Accés obert
      The purpose of this work is the development and validation of a Large Eddy Simulation (LES) model for the Aerodynamic’s Section at ESEIAAT in-house Vortex Cloud Method (VCM) fluid mechanics solver. The previous version of ...

    • Large eddy and direct numerical simulations of a turbulent water-filled differentially heated cavity of aspect ratio 5 

      Kizildag, Deniz; Trias Miquel, Francesc Xavier; Rodríguez Pérez, Ivette María; Oliva Llena, Asensio (2014-10-01)
      Article
      Accés obert
      Natural convection in a differentially heated cavity is characterized by different phenomena such as laminar to turbulent flow transition in the boundary layer, turbulent mixing, and thermal stratification in the core of ...