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Ara es mostren els items 126-145 de 345

    • Effect of collisions on the particle behavior in a turbulent square duct flow 

      Zhang, Hao; Trias Miquel, Francesc Xavier; Gorobets, Andrei; Oliva Llena, Asensio; Yang, Dongmin; Tan, Yuanqiang; Sheng, Yong (2015-01-01)
      Article
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      The effect of collisions on the particle behavior in a fully developed turbulent flow in a straight square duct at Re-r = 300 is numerically investigated. The hydrodynamic modeling of the fluid phase is based on direct ...

    • 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
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      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 ...

    • Effectiveness of adaptive mesh refinement strategies in the DNS of multiphase flows 

      Schillaci, Eugenio; Antepara Zambrano, Óscar; Lehmkuhl Barba, Oriol; Balcázar Arciniega, Néstor; Oliva Llena, Asensio (Begell House, 2015)
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      In this work, a finite-volume Adaptive Mesh Refinement (AMR) method for two phase flows able to dynamically achive the required mesh size in specific parts of the domain has been developed. The Navier-Stokes equations for ...

    • 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
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      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 ...

    • Efficient CFD code implementation for the ARM-based Mont-Blanc architecture 

      Oyarzun Altamirano, Guillermo; Borrell Pol, Ricard; Gorobets, Andrei; Mantovani, Filippo; Oliva Llena, Asensio (Elsevier, 2017-09-20)
      Article
      Accés obert
      Since 2011, the European project Mont-Blanc has been focused on enabling ARM-based technology for HPC, developing both hardware platforms and system software. The latest Mont-Blanc prototypes use system-on-chip (SoC) devices ...

    • Efficient CFD code implementation for the ARM-based Mont-Blanc architecture 

      Oyarzun Altamirano, Guillermo; Borrell Pol, Ricard; Gorobets, Andrei; Mantovani, Filippo; Oliva Llena, Asensio (Elsevier, 2018-02)
      Article
      Accés obert
      Since 2011, the European project Mont-Blanc has been focused on enabling ARM-based technology for HPC, developing both hardware platforms and system software. The latest Mont-Blanc prototypes use system-on-chip (SoC) devices ...

    • 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)
      Text en actes de congrés
      Accés obert
      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 ...

    • Electrical Conductivity of Concentrated LiBr Ethylene-Glycol and Water ternary system 

      Zheng, Jian; Bellmunt Chiva, Jorge; Castro González, Jesús; Liu, Yue; Oliva Llena, Asensio (Institute of Physics (IOP), 2021)
      Text en actes de congrés
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      LiBr/H2O as working pair in absorption chiller is widely used in the absorption refrigeration system, and the electrical conductivity is used as secondary properties as an empirical relation with temperature and concentration ...

    • Energy and exergy analysis of an absorption system with working pairs LiBr-H2O and Carrol-H2O at applications of cooling and heating 

      Zheng, Jian; Castro González, Jesús; Oliva Llena, Asensio; Oliet Casasayas, Carles (2021-12-01)
      Article
      Accés obert
      In this work, an air-cooled, single effect solar-driven absorption system is being evaluated from the point of view of 1 and 2 thermodynamic principles for two different applications: absorption chiller and heat pump. One ...

    • Energy simulation of a single family dwelling as a test bench for climate control system assessment 

      Capdevila Paramio, Roser; Souaihi, Oussama; Lopez, Joan; Rigola Serrano, Joaquim; Lehmkuhl Barba, Oriol; Oliva Llena, Asensio (2016)
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      In the present work a real dwelling (a semi-detached house in the Netherlands) has been modelled with an in-house modular object-oriented building simulation tool, called NEST-Buildings. This software models the whole ...

    • Exa, zetta, yotta and beyond: on the evolution of Poisson solvers 

      Trias Miquel, Francesc Xavier; Alsalti Baldellou, Àdel; Oliva Llena, Asensio (Parallel Computational Fluid Dynamics (ParCFD), 2023)
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      In this work, we aim to shed light to the following research question: is the complexity of numerically solving Poisson’s equation increasing or decreasing for very large DNS and LES simulations of incompressible flows? ...

    • Experimental analysis of no-frost domestic refrigerator evaporators 

      Oliet Casasayas, Carles; Pérez Segarra, Carlos David; Oliva Llena, Asensio; Rigola Serrano, Joaquim (2011)
      Comunicació de congrés
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      The air-to-refrigerant evaporator placed in no-frost refrigerators is a critical component because of its simultaneous treatment of both cooler and freezer air streams, which implies a strong drying process on the cooler ...

    • Experimental and numerical investigation of H2O vapor absorption processes in falling film of LiBr aqueous solution in vertical tubes 

      Castro González, Jesús; Farnós Baulenas, Joan; García Rivera, Eduardo; Oliva Llena, Asensio (2013)
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      The LiBr-H2O absorption systems are used mainly in large cooling capacity applications (industry, large buildings, etc.), therefore require water from cooling towers to reject heat. However, if middle and low capacity are ...

    • Experimental evaluation of a pre-industrial air-cooled LiBr-H2O small capacity absorption machine 

      Farnós Baulenas, Joan; Castro González, Jesús; García-Rivera, Eduardo; Oliva Llena, Asensio; Chiva Segura, Jorge (2011)
      Comunicació de congrés
      Accés obert
      The paper studies thermal design and describes the experimental set-up of a domestic-scale prototype experimental cooling system based on a 7kW of nominal capacity single-stage small LiBr-H2O air-cooled absorption machine. ...

    • 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 ...

    • 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 ...

    • Fine-scale dynamics in turbulent Rayleigh-Bénard convection 

      Dabbagh, Firas; Trias Miquel, Francesc Xavier; Gorobets, Andrei; Oliva Llena, Asensio (Begell House, 2015)
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      Small-scale universal features captured normally in many turbulent flows have been reviewed in Rayleigh-Bénard convection. Namely, dynamical Lagrangian representations of the velocity gradient tensor invariants have displayed ...

    • Fixed-grid numerical modeling of melting and solidification using variable thermo-physical properties - Application to the melting of n-Octadecane inside a spherical capsule 

      Galione Klot, Pedro Andrés; Lehmkuhl Barba, Oriol; Rigola Serrano, Joaquim; Oliva Llena, Asensio (2015-07-01)
      Article
      Accés obert
      A fixed-grid enthalpy model for unstructured meshes and explicit time integration schemes (Galione et al., 2014) is here extended for taking into account the change in density and other thermo-physical properties with the ...

    • Flamelet mathematical models for non-premixed laminar combustion 

      Carbonell Sánchez, Daniel; Pérez Segarra, Carlos David; Coelho, P.J.; Oliva Llena, Asensio (2009-02-01)
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      Detailed numerical calculations based on the solution of the full transport equations have been compared with flamelet calculations in order to analyse the flamelet concept for laminar diffusion flames. The goal of this ...

    • Flow and turbulent structures around simplified car models 

      Aljure Osorio, David E.; Lehmkuhl Barba, Oriol; Rodríguez Pérez, Ivette María; Oliva Llena, Asensio (Elsevier, 2014-06-13)
      Article
      Accés obert
      External car aerodynamics study has great importance in overall car efficiency and ride stability, being a key element in successful automotive design. The flow over car geometries shows three dimensional and unsteady ...