Ara es mostren els items 21-40 de 238

  • Analysis of IAQ based on modeling of building envelope coupled with CFD&HT room airflow 

    Capdevila Paramio, Roser; Lehmkuhl Barba, Oriol; Rigola Serrano, Joaquim; López Mas, Joan; Oliva Llena, Asensio (Purdue University, 2014)
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    Buildings represent a major part of the world energy requirement. The simulation of combined heat, air and moisture (HAM) and pollutant transfer in this context is important to predict the indoor air quality (IAQ), along ...
  • Analysis of the dynamic behavior of refrigerated spaces using air curtains 

    Jaramillo Ibarra, Julian Ernesto; Pérez Segarra, Carlos David; Oliva Llena, Asensio; Oliet Casasayas, Carles (2009-01-01)
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    This article is devoted to the study of air curtains applied to reduce the refrigerated chambers heat gains. The proposed strategy is based on the numerical simulation of air curtains by means of computational fluid dynamics ...
  • An efficient two-layer wall model for high Reynolds number large eddy simulation 

    Calafell Sandiumenge, Joan; Trias Miquel, Francesc Xavier; Oliva Llena, Asensio (International Centre for Numerical Methods in Engineering (CIMNE), 2018)
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    Wall-bounded flows at high Reynolds number are an important research field given that they are present in many important industrial applications. Nonetheless, the use of accurate numerical methodologies such as Large Eddy ...
  • An eulerian-lagrangian modeling of fluidized bed 

    Zhang, Hao; Yuan-Qiang, Tan; Dong-Min, Yang; Trias Miquel, Francesc Xavier; Sheng, Yong; Oliva Llena, Asensio (2013)
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    The particle motions in a fluidized bed were numerically simulated using a Eulerian-Lagrangian model. The solid phase was modelled via the Discrete Element Method (DEM) while the hydrodynamic model of the fluid phase was ...
  • A new statistical model for subgrid dispersion in large eddy simulations of particle-laden flows 

    Muela Castro, Jordi; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David; Oliva Llena, Asensio (Institute of Physics (IOP), 2016)
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    Dispersed multiphase turbulent flows are present in many industrial and commercial applications like internal combustion engines, turbofans, dispersion of contaminants, steam turbines, etc. Therefore, there is a clear interest ...
  • A new subgrid characteristic length for turbulence simulations on anisotropic grids 

    Trias Miquel, Francesc Xavier; Gorobets, Andrei; Silvis, Maurits; Verstappen, Roel; Oliva Llena, Asensio (2017-11-29)
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    Direct numerical simulations of the incompressible Navier-Stokes equations are not feasible yet for most practical turbulent flows. Therefore, dynamically less complex mathematical formulations are necessary for coarse-grained ...
  • An OpenCL-based parallel CFD code for simulations on hybrid systems with massively-parallel accelerators 

    Gorobets, Andrei; Trias Miquel, Francesc Xavier; Oliva Llena, Asensio (Elsevier, 2013)
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    A parallel finite-volume CFD algorithm for modeling of incompressible flows on hybrid supercomputers is presented. It is based on a symmetry-preserving high-order numerical scheme for structured meshes. A multilevel ...
  • A numerical study of liquid atomization regimes by means of conservative level-set simulations 

    Schillaci, Eugenio; Antepara Zambrano, Óscar; Balcazar, Nestor; Rigola Serrano, Joaquim; Oliva Llena, Asensio (Elsevier, 2019-01-30)
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    In this work, a conservative level-set finite-volume solver for interface-capturing is employed to perform the direct numerical simulation of Liquid Jets discharging into a quiescent air chamber. The scope is to propose a ...
  • A PLIC-VOF implementation on parallel 3D unstructured meshes 

    Jofre Cruanyes, Lluís; Lehmkuhl Barba, Oriol; Castro González, Jesús; Oliva Llena, Asensio (2010)
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    The numerical simulation of interfacial and free surface ows is a vast and interesting topic in the areas of engineering and fundamental physics, such as the study of liquid-gas interfaces, formation of droplets, bubbles ...
  • A priori study of subgrid-scale features in turbulent Rayleigh-Bénard convection 

    Dabbagh, Firas; Trias Miquel, Francesc Xavier; Gorobets, Andrei; Oliva Llena, Asensio (2017-10-06)
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    At the crossroad between flow topology analysis and turbulence modeling, a priori studies are a reliable tool to understand the underlying physics of the subgrid-scale (SGS) motions in turbulent flows. In this paper, ...
  • A Projected Ghost Fluid Method for a mimetic approach for extreme contrast interfaces in multiphase flows 

    Valle Marchante, Nicolás; Trias Miquel, Francesc Xavier; Castro González, Jesús; Oliva Llena, Asensio (2018)
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    In the context of a multimaterial domain, the GFM for the Laplacian operator is reformulated from an algebraic perspective, where operators are represented by matrices. From this perspective, a whole new level of analysis ...
  • A semi-implicit coupling technique for fluid–structure interaction problems with strong added-mass effect 

    Naseri, Alireza; Lehmkuhl Barba, Oriol; González Acedo, Ignacio; Bartrons Casademont, Eduard; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2018-07-01)
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    This paper is concerned with the numerical simulation of fluid–structure interaction problems involving an incompressible viscous flow and an elastic structure. A semi-implicit coupling technique is presented which strongly ...
  • A simple approach to discretize the viscous term with spatially varying (eddy-)viscosity 

    Trias Miquel, Francesc Xavier; Gorobets, Andrei; Oliva Llena, Asensio (2013-11-15)
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    A simple approach to discretize the viscous dissipation term in the incompressible Navier–Stokes equations with spatially varying viscosity is presented. Unlike the case where the viscosity remains constant, its discretization ...
  • 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)
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    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 ...
  • Blending regularization and large-eddy simulation. From homogeneous isotropic turbulence to wind farm boundary layers 

    Folch Flórez, David; Trias Miquel, Francesc Xavier; Gorobets, Andrei; Oliva Llena, Asensio (2013)
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    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 ...
  • Building a new subgrid characteristic length for LES 

    Trias Miquel, Francesc Xavier; Gorobets, Andrey; Duben, Alexey; Oliva Llena, Asensio (Keldysh Institute of Applied Mathematics, 2016)
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  • Building a proper tensor-diffusivity model for large-eddy simulation of buoyancy-driven flows 

    Trias Miquel, Francesc Xavier; Dabbagh, Firas; Gorobets, Andrei; Oliva Llena, Asensio (International Centre for Numerical Methods in Engineering (CIMNE), 2018)
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    In this work, we plan to shed light on the following research question: can we ¿nd a nonlinear tensorial subgrid-scale (SGS) heat ¿ux model with good physical and numerical properties, such that we can obtain satisfactory ...
  • Building proper invariants for eddy-viscosity subgrid-scale models 

    Trias Miquel, Francesc Xavier; Folch, David; Gorobets, Andrei; Oliva Llena, Asensio (2015-06-23)
    Article
    Accés obert
    Direct simulations of the incompressible Navier-Stokes equations are limited to relatively low-Reynolds numbers. Hence, dynamically less complex mathematical formulations are necessary for coarse-grain simulations. ...
  • Building proper invariants for large eddy simulation 

    Trias Miquel, Francesc Xavier; Folch, David; Gorobets, Andrei; Oliva Llena, Asensio (Springer, 2015)
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  • Building proper invariants for subgrid-scale eddy-viscosity models 

    Trias Miquel, Francesc Xavier; Folch, David; Gorobets, Andrei; Oliva Llena, Asensio (2015)
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    Since direct simulations of the incompressible Navier-Stokes equations are limited to relatively low-Reynolds numbers, dynamically less complex mathematical formulations are necessary for coarse-grain simulations. ...