Exploració per autor "Oliva Llena, Asensio"Més informacióMés informació

Ara es mostren els items 153-172 de 344

    • Heat and Mass Transfer Technological Center 

      Oliva Llena, Asensio (Campus de Terrassa de la UPC, 2013-06-13)
      Text en actes de congrés
      Accés obert

    • Heat and moisture insulation by means of air curtains: application to refrigerated chambers 

      Giráldez García, Héctor; Pérez Segarra, Carlos David; Oliet Casasayas, Carles; Oliva Llena, Asensio (Elsevier, 2016-08)
      Article
      Accés obert
      The present study is devoted to the determination of the efficiency of air curtain units (ACUs) applied to heat and moisture insulation of refrigerated chambers. A detailed study of the fluid dynamics and heat and mass ...

    • Heat transfer analysis and numerical simulation of a parabolic trough solar collector 

      Amine Hachicha, Ahmed; Rodríguez Pérez, Ivette María; Capdevila Paramio, Roser; Oliva Llena, Asensio (2013-11-01)
      Article
      Accés obert
      Parabolic trough solar collector is the most proven industry-scale solar generation technology today available. The thermal performance of such devices is of major interest for optimising the solar field output and increase ...

    • High-order finite volume method for linear elasticity on unstructured meshes 

      Castrillo Green, Pablo; Canelas, Alfredo; Schillaci, Eugenio; Rigola Serrano, Joaquim; Oliva Llena, Asensio (2022-08-01)
      Article
      Accés restringit per política de l'editorial
      This paper presents a high-order finite volume method for solving linear elasticity problems on two-dimensional unstructured meshes. The method is designed to increase the effectiveness of finite volume methods in solving ...

    • 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 ...

    • Implementation of two-equation soot flamelet models for laminar diffusion flames 

      Carbonell Sánchez, Daniel; Oliva Llena, Asensio; Pérez Segarra, Carlos David (2009-01-01)
      Article
      Accés restringit per política de l'editorial
      The two-equation soot model proposed by Leung et al. [K.M. Leung, R.P. Lindstedt, W.P. Jones, Combust. Flame 87 (1991) 289–305] has been derived in the mixture fraction space. The model has been implemented using both ...

    • Improved semi-analytical method for air curtains prediction 

      Giráldez García, Héctor; Pérez Segarra, Carlos David; Rodríguez Pérez, Ivette María; Oliva Llena, Asensio (2013-11)
      Article
      Accés restringit per política de l'editorial
      The present study is devoted to the analysis and prediction of the efficiency of air curtains. The attention is focused on improving existing semi-analytical methods with the information from CFD simulations and experimental ...

    • Improvements on the numerical analysis of viscoplastic-type non-Newtonian fluid flows 

      Carmona Muñoz, Ángel; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2014)
      Text en actes de congrés
      Accés obert
      The aim of this work is to delve into the numerical analysis of viscoplastic-type non-Newtonian fluid flows with the objective of carrying out more advanced numerical simulations for them. Specifically, improvements in the ...

    • Improving DES capabilities for predicting Kelvin-Helmholtz instabilities. Comparison with a backward-facing step DNS. 

      Pont Vilchez, Arnau; Trias Miquel, Francesc Xavier; Duben, Alexey; Revell, Alistair; Oliva Llena, Asensio (2020-05-10)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The Detached Eddy Simulation (DES) turbulence model presented by Spalart et al. (Comments on the Feasibility of LES for Wings, and on a Hybrid RANS/LES Approach, [1]) in the late 90s, was specifically designed to simulate ...

    • Influence of rotation on the flow over a cylinder at Re=5000 

      Aljure Osorio, David E.; Rodríguez Pérez, Ivette María; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2015-10-15)
      Article
      Accés restringit per política de l'editorial
      The influence of the rotation ratio on the forces acting on a circular cylinder at Re ¼ 5000 has been investigated by means of direct numerical simulations (DNS). Spin ratios in the range 0-5 have been considered. The ...

    • Influence of rotation on the flow over cylinder at RE=5000 

      Aljure Osorio, David E.; Rodríguez Pérez, Ivette María; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2014)
      Text en actes de congrés
      Accés obert

    • Introduction of CFD&HT analysis into an object oriented one dimensional and transient program for numerically simulate hermetic refrigeration compressors 

      López Mas, Joan; Rigola Serrano, Joaquim; Lehmkuhl Barba, Oriol; Oliva Llena, Asensio (2010)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      The present paper is a coupling between a modular object oriented one-dimensional and transient numerical simulation model for the thermal and fluid dynamic analysis of compressor behavior and CFD&HT code over the circulating ...

    • Investigating the capabilities of CFD-based data-driven models for indoor environmental design and control 

      Morozova, Nina; Trias Miquel, Francesc Xavier; Capdevila Paramio, Roser; Oliva Llena, Asensio (International Centre for Numerical Methods in Engineering (CIMNE), 2021)
      Text en actes de congrés
      Accés obert
      In this work, we study the accuracy of CFD-based data-driven models, which predict comfort-related flow parameters in a ventilated cavity with a heated floor. We compare the computational cost and accuracy of three different ...

    • Large eddy and direct numerical simulations of a turbulent water-filled differentially heated cavity of aspect ratio 5 

      Kizildag, Deniz; Trias Miquel, Francesc Xavier; Rodríguez Pérez, Ivette María; Oliva Llena, Asensio (2014-10-01)
      Article
      Accés obert
      Natural convection in a differentially heated cavity is characterized by different phenomena such as laminar to turbulent flow transition in the boundary layer, turbulent mixing, and thermal stratification in the core of ...

    • Large eddy simulation model assessment of the turbulent flow through dynamic compressor valves 

      Estruch Pérez, Olga; Lehmkuhl Barba, Oriol; Rigola Serrano, Joaquim; Oliva Llena, Asensio; Pérez Segarra, Carlos David (2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      The present paper attempts the dynamic simulation of the fluid flow through the valve reed taking into account valve movement due to piston displacement. This work widens previous studies based on numerical experiments ...

    • Large eddy simulation of a turbulent diffusion flame: some aspects of subgrid modelling consistency 

      Ventosa Molina, Jordi; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2017-04-26)
      Article
      Accés obert
      In the context of Large Eddy Simulation (LES) solely for the momentum transport equation there may be found several models for the turbulent subgrid fluxes. Furthermore, among those relying on the eddy diffusivity approach, ...

    • Large eddy simulation of a turbulent jet diffusion flame using the Flamelet-Progress Variable model 

      Ventosa, Jordi; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2013)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this work an hydrogen enriched methane flame in a non-premixed configuration is studied, which corresponds to the DLR flame A. Large Eddy Simulation (LES) will be used to numerically analyse the case. Unstructured meshes ...

    • Large Eddy Simulation of airflow in a single family house 

      Mohan Damle, Rashmin; Soria Guerrero, Manel; Lehmkuhl Barba, Oriol; Colomer Rey, Guillem; Oliva Llena, Asensio (2010)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      This work is addressed to contribute to the progress in the determination of indoor air flow in buildings. The air flow in such environments is caused by natural convection, stack and wind effects, infiltration of ambient ...