Exploració per autor "Calafell Sandiumenge, Joan"Més informacióMés informació

Ara es mostren els items 1-10 de 10

    • A data-driven wall-shear stress model for LES using gradient boosted decision trees 

      Radhakrishnan, Sarath; Adu Gyamfi, Lawrence; Miró Jané, Arnau; Font García, Bernat; Calafell Sandiumenge, Joan; Lehmkuhl Barba, Oriol (Springer Nature, 2021)
      Text en actes de congrés
      Accés obert
      With the recent advances in machine learning, data-driven strategies could augment wall modeling in large eddy simulation (LES). In this work, a wall model based on gradient boosted decision trees is presented. The model ...

    • A dynamic wall model for large eddy simulation on unstructured meshes. Application to wind turbine dedicated airfoils 

      Calafell Sandiumenge, Joan; Lehmkuhl Barba, Oriol; Rodríguez Pérez, Ivette María; Oliva Llena, Asensio; Pérez Segarra, Carlos David (Begell House, 2015)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      Large eddy simulations (LES) of wall resolved flows at high Reynolds number are still computation-ally demanding. In the present work, a new Dynamic Wall Model (DWM) for LES is presented. The methodology, implemented on ...

    • A stochastic approach to reconstruction of faults in elastic half space 

      Volkov, Darko; Calafell Sandiumenge, Joan (2019-06-01)
      Article
      Accés obert
      We introduce in this study an algorithm for the imaging of faults and of slip fields on those faults. The physics of this problem are modeled using the equations of linear elasticity. We define a regularized functional to ...

    • A time-average filtering technique to improve the efficiency of two-layer wall models for large eddy simulation in complex geometries 

      Calafell Sandiumenge, Joan; Trias Miquel, Francesc Xavier; Lehmkuhl Barba, Oriol; Oliva Llena, Asensio (Elsevier, 2019-06-30)
      Article
      Accés obert
      Two-Layer wall models have been recurrently studied since they represent a good physical model for Large Eddy Simulations with underresolved wall regions. Specifically, those based on the Reynolds Averaged Navier-Stokes ...

    • An efficient Two-Layer wall model for accurate numerical simulations of aeronautical applications 

      Calafell Sandiumenge, Joan; Trias Miquel, Francesc Xavier; Oliva Llena, Asensio (2019)
      Text en actes de congrés
      Accés obert
      Two-Layer wall models have been widely studied since they allow wall modeled Large Eddy Simulationsof general non-equilibrium flows. However, they are plagued by two persistent problems, the "log-layermismatch" and the ...

    • 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 ...

    • Efficient wall modeling for large eddy simulations of general non-equilibrium wall-bounded flows 

      Calafell Sandiumenge, Joan (Universitat Politècnica de Catalunya, 2019-07-05)
      Tesi
      Accés obert
      The main purpose of this thesis has been to contribute to the development of methodologies for wall modeling Large Eddy Simulations (LES) of wall-bounded flows, especially those at high Reynolds numbers. This flow configuration ...

    • Fast urban flow predictions through Convolutional Neural Networks 

      Calafell Sandiumenge, Joan; Bustillo, Jaime; Gomez Gonzalez, Samuel; Ramírez Jávega, Francisco; Radhakrishnan, Sarath; Lehmkuhl Barba, Oriol (2023)
      Text en actes de congrés
      Accés obert
      Having real-time and accurate numerical predictions of urban wind flow can be extremely useful for developing tools intended to improve citizens’ life quality and health. However, traditional methods such as Computational ...

    • Flow over a realistic car model: wall modeled large eddy simulations assessment and unsteady effects 

      Aljure Osorio, David E.; Calafell Sandiumenge, Joan; Baez Vidal, Aleix; Oliva Llena, Asensio (2018-03-01)
      Article
      Accés obert
      Numerical simulations are carried out on the flow over a realistic generic car geometry, the DrivAer-fastback car model. Pure large eddy simulations (LES) and wall-modeled large eddy simulations (WMLES) are used and compared ...

    • Numerical Resolution of Turbulent Flows 

      Calafell Sandiumenge, Joan (Universitat Politècnica de Catalunya, 2011-06-01)
      Projecte Final de Màster Oficial
      Accés obert
      The main goal of the project was to develop a new independent code able to solve turbulent ows numerically. Once the code nished, it has been used to solve three canonic ows of which benchmark solutions are published, ...