Ara es mostren els items 30-38 de 38

    • 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 ...