Ara es mostren els items 1-20 de 36

  • A load balancing method for parallel genetic CFD optimizations 

    Aizpurua Udabe, Imanol; Lehmkuhl Barba, Oriol; Borrell Pol, Ricard; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2015)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    CFD optimizations are characterized by long and highly variable objective function evaluation times. The aim of this study is to improve the parallel performance using a new load balancing master-worker parallelization ...
  • A parallel three-dimensional radial basis function interpolation method for unstructured dynamic meshes 

    Estruch Pérez, Olga; Lehmkuhl Barba, Oriol; Borrell Pol, Ricard; Pérez Segarra, Carlos David (2011)
    Comunicació de congrés
    Accés obert
    A radial basis function (RBF) interpolation method is implemented to be applied in computational fluid dynamics (CFD) problems with dynamic meshes. It is compared with the classic springs analogy smoothing, focusing on the ...
  • Assessment of 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 (2012-05-15)
    Article
    Accés restringit per política de l'editorial
    The main objective of the present paper is the assessment of symmetry-preserving regularization models on unstructured meshes. Three different test cases have been studied: the impinging jet flow, the flow past a circular ...
  • CFD simulation of the thermal behavior of a wind mill power generator nacelle 

    Colomer Rey, Guillem; Lehmkuhl Barba, Oriol; Borrell Pol, Ricard; Oliva Llena, Asensio (2009)
    Comunicació de congrés
    Accés restringit per política de l'editorial
    In this work we use the Large Eddy Simulation model to predict the thermal behavior of the air inside of a wind generator nacelle, where several elements with di erent thermal characteristics are found. Outside air enters ...
  • Characteristics of the near wake region behind a cylinder at critical and super-critical Reynolds numbers 

    Rodríguez Pérez, Ivette María; Lehmkuhl Barba, Oriol; Chiva Segura, Jorge; Borrell Pol, Ricard; Oliva Llena, Asensio (Begell House, 2015)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    Large-eddy simulations (LES) of the flow past a circular cylinder are used to investigate the characteristics of the near wake region at Reynolds numbers Re = 2.5 × 105 - 8.5 × 105. This range encompasses both the critical ...
  • Direct numerical simulation of a NACA0012 in full stall 

    Rodríguez Pérez, Ivette María; Lehmkuhl Barba, Oriol; Borrell Pol, Ricard; Oliva Llena, Asensio (2013-10-15)
    Article
    Accés obert
    This work aims at investigating the mechanisms of separation and the transition to turbulence in the separated shear-layer of aerodynamic profiles, while at the same time to gain insight into coherent structures formed ...
  • Direct numerical simulation of the flow over a sphere at Re = 3700 

    Rodríguez Pérez, Ivette María; Borrell Pol, Ricard; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2011-05-19)
    Article
    Accés restringit per política de l'editorial
    The direct numerical simulation of the flow over a sphere is performed. The computations are carried out in the sub-critical regime at Re = 3700 (based on the free-stream velocity and the sphere diameter). A parallel ...
  • Direct Numerical Simulation of the flow over a sphere at Re = 3700 

    Rodríguez Pérez, Ivette María; Borrell Pol, Ricard; Lehmkuhl Barba, Oriol; Oliva Llena, Asensio; Pérez Segarra, Carlos David (2009)
    Comunicació de congrés
    Accés restringit per política de l'editorial
    The direct numerical simulation of the flow past a sphere at Re=3700 is presented. The computations are carried out with a parallel unstructured symmetry preserving information for accurate solving complex geometries. As ...
  • Direct numerical simulation of the flow over a spherical bubble in a turbulent pipe flow 

    Jofre Cruanyes, Lluís; Balcázar Arciniega, Néstor; Lehmkuhl Barba, Oriol; Borrell Pol, Ricard; Castro González, Jesús (International Association for Computational Mechanics (IACM), 2014)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    This work aims at investigating, by means of a direct numerical simulation, the flow over a clean spherical bubble fixed on the axis of a turbulent pipe flow. The simulation is performed by means of a parallel unstructured ...
  • Direct numerical simulation of turbulent flows with parallel algorithms for various computing architectures 

    Gorobets, Andrei; Trias Miquel, Francesc Xavier; Borrell Pol, Ricard; Oyarzun Altamirano, Guillermo; Oliva Llena, Asensio (International Association for Computational Mechanics (IACM), 2014)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    The purpose of the work is twofold. Firstly, it is devoted to the development of efficient parallel algorithms for large-scale simulations of turbulent flows on different supercomputer architectures. It reports experience ...
  • Direct numerical simulation of turbulent wakes: flow past a sphere at Re=5000 

    Rodríguez Pérez, Ivette María; Lehmkuhl Barba, Oriol; Borrell Pol, Ricard; Oliva Llena, Asensio; Pérez Segarra, Carlos David (2010)
    Text en actes de congrés
    Accés obert
    The flow around bluff bodies is of great interest for a large number of engineering applications such as vehicle aerodynamics, cooling devices using forced convection, heat transfer enhancement using droplets, among ...
  • Direct numerical simulations and symmetry preserving regularization simulations of the flow over a circular cylinder at Reynolds number 3900 

    Lehmkuhl Barba, Oriol; Borrell Pol, Ricard; Pérez Segarra, Carlos David; Chiva Segura, Jorge; Oliva Llena, Asensio (2009-09-14)
    Comunicació de congrés
    Accés restringit per política de l'editorial
    Flow around cylindrical structures is of relevance for many practical applications. Knowledge of flow-related unsteady loading of such structures is crucial for hydro - and aerodynamic control and design. Recenty, the ...
  • Effect of mesh partition on the scalability of the parallel solution of the radiative transfer equation 

    Colomer Rey, Guillem; Borrell Pol, Ricard; Trias Miquel, Francesc Xavier; Oliva Llena, Asensio (2011)
    Comunicació de congrés
    Accés restringit per política de l'editorial
    The radiative transfer equation is solved in parallel using spatial domain decomposition. The effect of several kinds of mesh partitioning strategies is analyzed in this work. Geometries discretized with both structured ...
  • Efficiency of large-scale CFD simulations on modern supercomputers using thousands of CPUS and hybrid MPI+OPENMP parallelization 

    Gorobets, Andrei; Borrell Pol, Ricard; Trias Miquel, Francesc Xavier; Kozubskaya, T.K.; Oliva Llena, Asensio (2010)
    Comunicació de congrés
    Accés restringit per política de l'editorial
    This work represents an experience in using the hybrid parallel model to perform large-scale DNS. Advantages of the hybrid approach compared to the MPI-only approach are presented and discussed. The use of OpenMP in addition ...
  • FFT-based Poisson Solver for large scale numerical simulations of incompressible flows 

    Borrell Pol, Ricard; Lehmkuhl Barba, Oriol; Trias Miquel, Francesc Xavier; Oyarzún, G.; Oliva Llena, Asensio (2011)
    Comunicació de congrés
    Accés obert
    In the context of time-accurate numerical simulation of incompressible flows, a Poisson equation needs to be solved at least once per time-step to project the velocity field onto a divergence-free space. Due to the non-local ...
  • Flow dynamics in the turbulent wake of a sphere at sub-critical Reynolds numbers 

    Rodríguez Pérez, Ivette María; Lehmkuhl Barba, Oriol; Borrell Pol, Ricard; Oliva Llena, Asensio (2011)
    Text en actes de congrés
    Accés restringit per política de l'editorial
    The direct numerical simulation of the flow over a sphere is performed. The computations are carried out in the sub-critical regime at Re = 3700 and Re = 10000 (based on the free-stream velocity and the sphere diameter). ...
  • Flow past a NACA0012 airfoil: from laminar separation bubbles to fully stalled regime 

    Rodríguez Pérez, Ivette María; Lehmkuhl Barba, Oriol; Borrell Pol, Ricard; Oliva Llena, Asensio (Springer, 2013)
    Text en actes de congrés
    Accés restringit per política de l'editorial
  • Hybrid MPI+OpenMP parallelization of a Navier-Stokes solver for large-scale DNS 

    Gorobets, Andrei; Trias Miquel, Francesc Xavier; Borrell Pol, Ricard; Soria Guerrero, Manel; Oliva Llena, Asensio (2011)
    Comunicació de congrés
    Accés restringit per política de l'editorial
    This work presents a parallel Navier-Stokes solver for the large-scale direct numerical simulation (DNS) of incompressible flows with one periodic direction. It is based on a scalable Poisson solver that combines an FFT ...
  • Hybrid MPI+OpenMP parallelization of an FFT-based 3D Poisson solver that can reach 100000 CPU cores 

    Gorobets, Andrei; Trias Miquel, Francesc Xavier; Borrell Pol, Ricard; Soria Guerrero, Manel; Oliva Llena, Asensio (2011)
    Text en actes de congrés
    Accés obert
    This work is devoted to the development of efficient parallel algorithms for the direct numerical simulation (DNS) of incompressible flows on modern supercomputers. A Poisson solver for problems with one uniform periodic ...
  • Hybrid MPI+OpenMP parallelization of an FFT-based 3D Poisson solver with one periodic direction 

    Gorobets, Andrei; Trias Miquel, Francesc Xavier; Borrell Pol, Ricard; Lehmkuhl Barba, Oriol; Oliva Llena, Asensio (2011-10)
    Article
    Accés restringit per política de l'editorial
    This work is devoted to the development of efficient parallel algorithms for the direct numerical simulation (DNS) of incompressible flows on modern supercomputers. In doing so, a Poisson equation needs to be solved at ...