Ara es mostren els items 20-38 de 38

    • 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 variable-density round and plane jets 

      Foysi, Holger; Mellado González, Juan Pedro; Sarkar, Sutanu (2010-06-01)
      Article
      Accés obert
      Large eddy simulations of turbulent heated jets have been carried out and validated against experimental data. The code employed in this work is based on the OpenFOAM platform. Heated jets with Reynolds number varying ...
    • Mixed finite element methods with convection stabilization for the large eddy simulation of incompressible turbulent flows 

      Colomés Gené, Oriol; Badia, Santiago; Principe, Ricardo Javier (2016-06)
      Article
      Accés obert
      The variational multiscale method thought as an implicit large eddy simulation model for turbulent flows has been shown to be an alternative to the widely used physical-based models. This method is traditionally combined ...
    • Modeling of the trajectory of ice thrown from a wind turbine 

      Rocchi, Elena (Universitat Politècnica de Catalunya, 2023-10-26)
      Projecte Final de Màster Oficial
      Accés obert
      Realitzat a/amb:   Lunds universitet
      There is a growing number of wind turbines installed in cold temperature zones as a result of the restricted space for new construction. Due to ice deposition on the turbine blades, the increasing installation of wind ...
    • Numerical simulation of turbulent diffusion flames using flamelet models on unstructured meshes 

      Ventosa Molina, Jordi (Universitat Politècnica de Catalunya, 2015-10-02)
      Tesi
      Accés obert
      The present thesis aims at developing numerical methods and algorithms for the efficient simulation of diffusion flames in the flamelet regime. To tackle turbulent chemically reacting flows a double framework is used in ...
    • Numerical simulations of turbulent flows using high performance computing 

      Regener Roig, Daniel (Universitat Politècnica de Catalunya, 2021-01-13)
      Treball Final de Grau
      Accés restringit per decisió de l'autor
      This report presents the procedures and results obtained in the project ’Numerical Simulation of Turbulent Flows Using High Performance Computing’, in which a high performance code for fluid dynamics simulation (SA3) has ...
    • On the symmetry-preserving regularization model on complex flows using unstructured grids 

      Lehmkuhl Barba, Oriol; Borrell Pol, Ricard; Rodríguez Pérez, Ivette María; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2010)
      Text en actes de congrés
      Accés obert
      Traditionally turbulence modeling of industrial flows in complex geometries have been solved using RANS models and unstructured meshes based solvers. The lack of precision of RANS models in these situations and the increase ...
    • Segregated Runge–Kutta time integration of convection-stabilized mixed finite element schemes for wall-unresolved LES of incompressible flows 

      Colomés Gené, Oriol; Badia, Santiago (2017-01)
      Article
      Accés obert
      In this work, we develop a high-performance numerical framework for the large eddy simulation (LES) of incompressible flows. The spatial discretization of the nonlinear system is carried out using mixed finite element (FE) ...
    • Simulation numérique et modélisation de l'interaction fluide-structure et étude vibratoire de deux cylindres en tandem à nombre de Reynolds élevé 

      Ferreira Perez, Saul (Universitat Politècnica de Catalunya, 2013-09)
      Treball Final de Grau
      Accés obert
      Dans le contexte des interactions fluide-structure, ce stage a consisté en l'analyse physique d'un écoulement instationnaire autour d'une configuration de deux cylindres en tandem à nombre de Reynolds élevé, au moyen de ...
    • Study of the effect of viscosity in drop breakup in turbulent flow 

      Fernández Stolpa, Lucas (Universitat Politècnica de Catalunya, 2021-07-12)
      Treball Final de Grau
      Accés obert
      Realitzat a/amb:   Universität Bremen
      The systems formed by two immiscible liquids such as emulsions are of great interest in industrial processes, the emulsion formation process occurs depending on the phenomenon of the breakup of the drops of one of the ...
    • Temperature gradient effects on a turbulent channel flow at Ret=400 

      García Berenguer, Marina; Gasparino, Lucas; Lehmkuhl Barba, Oriol; Rodríguez Pérez, Ivette María (Begell House, 2023)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      A direct numerical simulation (DNS) of an asymmetrically heated turbulent channel flow has been performed to study the temperature gradient effects on the turbulence. The case has been set as a compressible flow with ...
    • Towards a machine learning model for explicit algebraic Reynolds stress modelling using multi-expression programming 

      Miró Jané, Arnau; Wallin, Stefan; Colombo, Alessandro; Temmerman, Lionel; Wunsch, Dirk; Lehmkuhl Barba, Oriol (European Research Community on Flow, Turbulence, and Conbustion (ERCOFTAC), 2023)
      Text en actes de congrés
      Accés obert
      A novel framework for a 5-term explicit algebraic Reynolds stress model has been proposed, which is suitable for machine learning procedures. Under this framework, high-fidelity datasets have been explored and post-processed. ...
    • Turbulence behind 3D multi-scale sparse grids 

      Usama, Syed; Tellez Alvarez, Jackson David; Kopec, Jasek; Kwiatkowski, Kamil; Redondo Apraiz, José Manuel; Malik, Nadeem (Institute of Physics (IOP), 2018)
      Text en actes de congrés
      Accés obert
      A fundamentally new idea in grid generated turbulence is the 3D Sparse Grid (3DS) concept [N. A. Malik. Sparse 3D Multi-Scale Grid Turbulence Generator. US Patent No. US 9,599,269 B2 (2017)] which reduces the effective ...
    • Turbulence modelling and numerical issues: from RANS to DNS and LES 

      Pérez Segarra, Carlos David; Lehmkuhl Barba, Oriol; Jaramillo Ibarra, Julian Ernesto; Colomer Rey, Guillem; Oliva Llena, Asensio (2009)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      The objective of this work is to show possibilities and limitations of different turbulence models from RANS to DNS and LES. Firstly, standard approaches based on time averaging the governing equations (the so called ...
    • Turbulence transition in pulsating pipe flow: shear-thinning effects 

      Dot Casadevall, Laura (Universitat Politècnica de Catalunya, 2021-07-12)
      Treball Final de Grau
      Accés obert
      Realitzat a/amb:   Universität Bremen
      In the last years the major cause of death worldwide has turned out to be because of cardiovascular diseases; for instance, owing to the presence of blood turbulence in our vessels. The problem has already been addressed ...
    • Turbulent boundary layer in a 3-element high-lift wing: coherent structures identification 

      Montalà Sales, Ricard; Eiximeno Franch, Benet; Miró Jané, Arnau; Lehmkuhl, Oriol; Rodríguez Pérez, Ivette María (Springer, 2023)
      Capítol de llibre
      Accés restringit per política de l'editorial
      A large eddy simulation (LES) of the flow past a 30P30N high-lift three-element wing is performed at the angle of attack AoA = 9º and a Reynolds number of Re = 750,000, based on the nested chord. Results are validated ...
    • Turbulent separated shear flow control by surface plasma actuator: experimental optimization by genetic algorithm approach 

      Benard, N.; Pons Prats, Jordi; Periaux, Jacques Francis; Bugeda Castelltort, Gabriel; Braud, P.; Bonnet, J.P.; Moreau, E. (2016-02)
      Article
      Accés obert
      The potential benefits of active flow control are no more debated. Among many others applications, flow control provides an effective mean for manipulating turbulent separated flows. Here, a nonthermal surface plasma ...
    • Turbulent statistics and coherent structures in an asymmetrically heated channel flow 

      García Berenguer, Marina; Gasparino, Lucas; Lehmkuhl Barba, Oriol; Rodríguez Pérez, Ivette María (2023)
      Text en actes de congrés
      Accés obert
      A compressible direct numerical simulation (DNS) has been conducted to analyze the behavior of a fully developed turbulent channel flow. The problem has been set at mean friction Reynolds number Ret m = 400 submitted to a ...
    • Variational multiscale approximation of the one-dimensional forced Burgers equation: the role of orthogonal subgrid scales in turbulence modeling 

      Bayona Roa, Camilo Andrés; Baiges Aznar, Joan; Codina, Ramon (2018-02)
      Article
      Accés obert
      A numerical approximation for the one-dimensional Burgers equation is proposed by means of the orthogonal subgrid scales–variational multiscale (OSGS-VMS) method. We evaluate the role of the variational subscales in ...