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Ara es mostren els items 125-144 de 149

    • Regularization modeling of wall-bounded turbulent flows 

      Trias Miquel, Francesc Xavier; Gorobets, Andrei; Verstappen, R.W.C.P.; Oliva Llena, Asensio (2010)
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      Since direct numerical simulations cannot be computed at high Reynolds numbers, a dynamically less complex formulation is sought. In the quest for such a formulation, we consider regularizations of the convective term ...

    • Reliable overnight industrial LES: challenges and limitations. Application to CSP technologies 

      Alsalti Baldellou, Àdel; Colomer Rey, Guillem; Hopman, Johannes Arend; Álvarez Farré, Xavier; Gorobets, Andrei; Trias Miquel, Francesc Xavier; Pérez Segarra, Carlos David; Oliva Llena, Asensio (European Research Community on Flow, Turbulence, and Conbustion (ERCOFTAC), 2023)
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      Preserving the operators’ symmetries at the discrete level is crucial to enable reliable DNS and LES simulations of turbulent flows. Moreover, real-world applications demand robust and stable numerical methods suitable for ...

    • Robust and reliable DNS and LES on unstructured grids 

      Trias Miquel, Francesc Xavier; Hopman, Johannes Arend; Santos Serrano, Daniel; Gorobets, Andrei; Oliva Llena, Asensio (European Research Community on Flow, Turbulence, and Conbustion (ERCOFTAC), 2023)
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      Preserving the operators symmetries at discrete level is the key aspect to enable reliable DNS and LES simulations of turbulent flows. On the other hand, realworld applications demand robust and stable numerical methods ...

    • Spectrally-consistent regularization modeling at very high Rayleigh numbers 

      Trias Miquel, Francesc Xavier; Gorobets, Andrei; Verstappen, R.W.C.P.; Oliva Llena, Asensio (Begell House, 2012)
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      The incompressible Navier-Stokes equations constitute an excellent mathematical modelization of turbulence. Unfortunately, attempts at performing direct simulations are limited to relatively low-Rayleigh numbers because ...

    • Spectrally-consistent regularization modeling of turbulent natural convection flows 

      Trias Miquel, Francesc Xavier; Verstappen, R.W.C.P.; Gorobets, Andrei; Oliva Llena, Asensio (Université de Poitiers, 2012)
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      The incompressible Navier-Stokes equations constitute an excellent mathematical modelization of turbulence. Unfortunately, attempts at performing direct simulations are limited to relatively low-Reynolds numbers because ...

    • Spectrally-consistent regularization modeling of wind farm boundary layers 

      Trias Miquel, Francesc Xavier; Folch, David; Gorobets, Andrei; Oliva Llena, Asensio (2012)
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      The incompressible Navier-Stokes equations constitute an excellent mathematical modelization of turbulence. Unfortunately, attempts at performing direct simulations are limited to relatively low-Reynolds numbers because ...

    • Spectrally-Consistent Regularization of Navier–Stokes Equations 

      Trias Miquel, Francesc Xavier; Folch Flórez, David; Gorobets, Andrei; Oliva Llena, Asensio (2019-05)
      Article
      Accés obert
      The incompressible Navier–Stokes equations form an excellent mathematical model for turbulent flows. However, direct simulations at high Reynolds numbers are not feasible because the convective term produces far too many ...

    • Spectrally-consistent regularization of turbulent Rayleigh-Bénard convection 

      Dabbagh, Firas; Trias Miquel, Francesc Xavier; Gorobets, Andrei; Oliva Llena, Asensio (International Association for Computational Mechanics (IACM), 2014)
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      Direct numerical simulation (DNS) of turbulent Rayleigh-Bénard convection in an air filled (Pr = 0,7) rectangular cell of squared cross-section with periodic boundary conditions in the span-wise direction, has been carried ...

    • Strategies for increasing the arithmetic intensity on ensemble averaged parallel-in-time simulations 

      Plana Riu, Josep; Trias Miquel, Francesc Xavier; Alsalti Baldellou, Àdel; Oliva Llena, Asensio (Parallel Computational Fluid Dynamics (ParCFD), 2023)
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      Extracting flow statistics from flow simulations requires generally long in- tegration intervals in which a good deal of the time is spent time-averaging the results. In order to avoid this, ensemble averaging can be applied ...

    • Strategies for the heterogeneous execution of large-scale simulations on hybrid supercomputers 

      Álvarez Farré, Xavier; Gorobets, Andrei; Trias Miquel, Francesc Xavier (International Centre for Numerical Methods in Engineering (CIMNE), 2018)
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      Massively-parallel devices of various architectures are being adopted by the newest supercomputers to overcome the actual power constraint in the context of the exascale challenge. This progress leads to an increasing ...

    • Strategies to increase the arithmetic intensity of the linear solvers 

      Alsalti Baldellou, Àdel; Álvarez Farré, Xavier; Gorobets, Andrei; Oliva Llena, Asensio; Trias Miquel, Francesc Xavier (Parallel Computational Fluid Dynamics (ParCFD), 2022)
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      The present work presents a strategy to increase the arithmetic intensity of the solvers. Namely, we profit spatial reflection symmetries to block diagonalise Poisson's equation and split the resulting blocks into a common ...

    • Subgrid-Scale Model Based on the Invariants of the Gradient Model Tensor 

      Folch Flórez, David; Trias Miquel, Francesc Xavier; Gorobets, Andrei; Oliva Llena, Asensio (2021)
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      The incompressible Navier-Stokes equations stand as the best mathematical model for turbulent flows. However, direct numerical simulations at high Reynolds numbers are not yet feasible because the convective term produces ...

    • Symmetry-preserving discretisation methods for magnetohydrodynamics 

      Hopman, Johannes Arend; Trias Miquel, Francesc Xavier; Rigola Serrano, Joaquim (Scipedia, 2022)
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      In this work, the symmetry-preserving method [1, 2, 3] is extended to include magnetohydrodynamic effects, using the collocated grid arrangement of Ni et al. [4, 5]. The electromagnetic part is solved explicitly using the ...

    • Symmetry-preserving discretization of Navier-Stokes equations on collocated unstructured meshes 

      Trias Miquel, Francesc Xavier; Lehmkuhl Barba, Oriol; Oliva Llena, Asensio; Pérez Segarra, Carlos David; Verstappen, R.W.C.P. (2014-02-01)
      Article
      Accés restringit per política de l'editorial
      A fully-conservative discretization is presented in this paper. The same principles followed by Verstappen and Veldman (2003) [3] are generalized for unstructured meshes. Here, a collocated-mesh scheme is preferred over a ...

    • Symmetry-preserving discretization of Navier-Stokes on unstructured grids: collocated vs staggered 

      Trias Miquel, Francesc Xavier; Valle Marchante, Nicolás; Gorobets, Andrei; Oliva Llena, Asensio (2021)
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      The essence of turbulence are the smallest scales of motion. They result from a subtle balance between convective transport and diffusive dissipation. Mathematically, these terms are governed by two differential operators ...

    • Symmetry-Preserving Discretizations In Unstructured Staggered Meshes 

      Valle Marchante, Nicolás; Trias Miquel, Francesc Xavier; Verstappen, R.W.C.P. (2021)
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      The adoption of symmetry-preserving discretizations is presented in terms of the collocated, unstructured meshes customary of commercial codes. By adopting an algebraic approach, a discretization of the convective terms ...

    • Symmetry-preserving regularization of wall-bounded turbulent flows 

      Trias Miquel, Francesc Xavier; Gorobets, Andrei; Verstappen, Roel W.C.P.; Oliva Llena, Asensio (2011)
      Article
      Accés obert
      The incompressible Navier-Stokes equations constitute an excellent mathematical modelization of turbulence. Unfortunately, attempts at performing direct simulations are limited to relatively low-Reynolds numbers because ...

    • Symmetry-preserving regularization of wall-bounded turbulent flows 

      Trias Miquel, Francesc Xavier; Gorobets, Andrei; Verstappen, R.W.C.P.; Oliva Llena, Asensio (2011)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      The incompressible Navier-Stokes equations constitute an excellent mathematical modelization of turbulence. Unfortunately, attempts at performing direct simulations are limited to relatively low-Reynolds numbers because ...

    • Towards proper subgrid-scale model for jet aerodynamics and aeroacoustics 

      Duben, Alexey; Ruano Pérez, Jesús; Trias Miquel, Francesc Xavier; Gorobets, Andrei (Scipedia, 2022)
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      This article presents the investigation of different grey-area mitigation (GAM) techniques towards achieving accurate subsonic turbulent round jet aerodynamics and aeroacoustics results. Combinations of new adapting subgrid ...

    • Towards Real-Time CFD Simulation of Indoor Environment 

      Morozova, Nina; Capdevila Paramio, Roser; Trias Miquel, Francesc Xavier; Oliva Llena, Asensio (2018)
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      Growing computational power and improved numerical algorithms make Computational Fluid Dynamics (CFD) an attractive tool for simulations of indoor environment. In this study di¿erent turbulent models and discretization ...