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    • A hierarchical parallel implementation for heterogeneous computing. Application to algebra-based CFD simulations on hybrid supercomputers 

      Álvarez Farré, Xavier; Gorobets, Andrei; Trias Miquel, Francesc Xavier (Elsevier, 2021-01)
      Article
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      The quest for new portable implementations of simulation algorithms is motivated by the increasing variety of computing architectures. Moreover, the hybridization of high-performance computing systems imposes additional ...

    • A hierarchical parallel implementation model for algebra-based CFD simulations on hybrid supercomputers 

      Álvarez Farré, Xavier (Universitat Politècnica de Catalunya, 2022-09-05)
      Tesi
      Accés obert
      (English) Continuous enhancement in hardware technologies enables scientific computing to advance incessantly and reach further aims. Since the start of the global race for exascale high-performance computing (HPC), ...

    • A highly portable heterogeneous implementation of a Poisson solver for flows with one periodic direction 

      Alsalti Baldellou, Àdel; Trias Miquel, Francesc Xavier; Álvarez Farré, Xavier; Oliva Llena, Asensio (2021)
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      The portability of codes has become a major advantage given the continuous development of new architectures for numerical applications, as well as the progressive incorporation of accelerators in modern supercomputers. ...

    • A pure virtual approach for managing platform portability on hybrid supercomputers 

      Álvarez Farré, Xavier; Gorobets, Andrei; Alsalti Baldellou, Àdel; Trias Miquel, Francesc Xavier (2019)
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      Commonly, the development of scientific computing software follows a stencilbased approach: the numerical methods and algorithms are introduced into computing systems through stencil data structures and sweeps (i.e. ...

    • Algebraic implementation of a flux limiter for heterogeneous computing 

      Valle Marchante, Nicolás; Álvarez Farré, Xavier; Trias Miquel, Francesc Xavier; Castro González, Jesús; Oliva Llena, Asensio (2018)
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    • Development of a low-level, algebra-based library to provide platform portability on hybrid supercomputers 

      Álvarez Farré, Xavier; Alsalti Baldellou, Àdel; Colomer Rey, Guillem; Gorobets, Andrei; Trias Miquel, Francesc Xavier; Oliva Llena, Asensio (Scipedia, 2022)
      Text en actes de congrés
      Accés obert
      Continuous enhancement in hardware technologies enables scientific computing to advance incessantly and reach further aims. Since the start of the global race for exascale high-performance computing, massively-parallel ...

    • DNS and LES of buoyancy-driven turbulence at high Rayleigh numbers: numerical methods and SGS models 

      Trias Miquel, Francesc Xavier; Álvarez Farré, Xavier; Santos Serrano, Daniel; Gorobets, Andrei; Oliva Llena, Asensio (Springer, 2022)
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      Buoyancy-driven flows have always been an important subject of scientific studies with numerous applications in environment and technology.

    • 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
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      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)
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      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 ...

    • Efficient strategies for solving the variable Poisson equation with large contrasts in the coefficients 

      Alsalti Baldellou, Àdel; Álvarez Farré, Xavier; Gorobets, Andrei; Trias Miquel, Francesc Xavier; Oliva Llena, Asensio (2022)
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      Discrete versions of Poisson’s equation with large contrasts in the coefficients result in very ill-conditioned systems. Thus, its iterative solution represents a major challenge, for instance, in porous media and multiphase ...

    • Exploiting spatial symmetries for solving Poisson's equation 

      Alsalti Baldellou, Àdel; Álvarez Farré, Xavier; Trias Miquel, Francesc Xavier; Oliva Llena, Asensio (Elsevier, 2023-08-01)
      Article
      Accés obert
      This paper presents a strategy to accelerate virtually any Poisson solver by taking advantage of s spatial reflection symmetries. More precisely, we have proved the existence of an inexpensive block diagonalisation that ...

    • Exploiting symmetries for preconditioning Poisson's equation in CFD simulations 

      Alsalti Baldellou, Àdel; Álvarez Farré, Xavier; Janna, Carlo; Trias Miquel, Francesc Xavier (Association for Computing Machinery (ACM), 2023)
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      Divergence constraints are present in the governing equations of many physical phenomena, and they usually lead to a Poisson equation whose solution is one of the most challenging parts of scientific simulation codes. ...

    • HPC² - A fully-portable, algebra-based framework for heterogeneous computing. Application to CFD 

      Álvarez Farré, Xavier; Gorobets, Andrei; Trias Miquel, Francesc Xavier; Borrell Pol, Ricard; Oyarzun Altamirano, Guillermo (Elsevier, 2018-09)
      Article
      Accés obert
      The variety of computing architectures competing in the exascale race makes the portability of codes of major importance. In this work, the HPC2 code is presented as a fully-portable, algebra-based framework suitable for ...

    • Implementation of a flux-limiter into a fully-portable, algebra-based framework for heterogeneous computing 

      Álvarez Farré, Xavier; Valle Marchante, Nicolás; Gorobets, Andrei; Trias Miquel, Francesc Xavier (2018)
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      During the last years, there has been a signi¿cant increment in the variety of hardware to overcome the power constraint in the context of the exascale challenge. This progress is leading to an increasing hybridisation of ...

    • Low-rank corrections for increasing the arithmetic intensity of the preconditioners 

      Alsalti Baldellou, Àdel; Janna, Carlo; Álvarez Farré, Xavier; Trias Miquel, Francesc Xavier (Parallel Computational Fluid Dynamics (ParCFD), 2023)
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      Spatial reflection symmetries are common in many academic and industrial CFD configurations. Given a mesh with s symmetries, it is possible to transform Poisson’s equation into a set of 2^s fully-decoupled subsystems. By ...

    • NUMA-Aware strategies for the efficient execution of CFD simulations on CPU supercomputers 

      Álvarez Farré, Xavier; Gorobets, Andrei; Trias Miquel, Francesc Xavier; Oliva Llena, Asensio (2021)
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      The growing variety of computing architectures and the hybridization of high-performance computing systems encourage the research for portable implementations of numerical methods in simulation codes. However, the pursuit ...

    • NUMA-Aware Strategies for the Heterogeneous Execution of SPMV on Modern Supercomputers 

      Álvarez Farré, Xavier; Gorobets, Andrei; Trias Miquel, Francesc Xavier; Oliva Llena, Asensio (2021)
      Text en actes de congrés
      Accés obert
      The sparse matrix-vector product is a widespread operation amongst the scientific computing community. It represents the dominant computational cost in many large-scale simulations relying on iterative methods, and its ...

    • On the benefits and applications of sparse matrix-matrix product on various parallel architectures 

      Álvarez Farré, Xavier; Alsalti Baldellou, Àdel; Gorobets, Andrei; Oliva Llena, Asensio; Trias Miquel, Francesc Xavier (Parallel Computational Fluid Dynamics (ParCFD), 2022)
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      Sparse matrix-vector multiplications are essential in the numerical resolution of partial differential equations. However, the sparse matrix-vector product is a strongly memory-bound kernel that suffers from data starving. ...

    • On the implementation of flux limiters in algebraic frameworks 

      Valle Marchante, Nicolás; Álvarez Farré, Xavier; Gorobets, Andrei; Castro González, Jesús; Oliva Llena, Asensio; Trias Miquel, Francesc Xavier (2022-02-01)
      Article
      Accés obert
      The use of flux limiters is widespread within the scientific computing community to capture shock dis- continuities and are of paramount importance for the temporal integration of high-speed aerodynamics, multiphase flows ...

    • 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 ...