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    • Advanced CFD&HT numerical modeling of solar tower receivers 

      Colomer Rey, Guillem; Chiva Segura, Jorge; Lehmkuhl Barba, Oriol; Oliva Llena, Asensio (Elsevier, 2013)
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      This paper presents an advanced methodology for the detailed modeling of the heat transfer and fluid dynamics phenomena in solar tower receivers. It has been carried out in the framework of a more ambitious enterprise which ...

    • An Energy-preserving unconditionally stable fractional step method for DNS/LES on collocated unstructured grids 

      Santos Serrano, Daniel; Trias Miquel, Francesc Xavier; Colomer Rey, Guillem; Oliva Llena, Asensio (Springer, 2022)
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      A finite-volume discretization over unstructured meshes is the most used formulation to solve Navier-Stokes equations by many general purpose CFD packages codes such as OpenFOAM or ANSYS-Fluent.

    • An energy-preserving unconditionally stable fractional step method on collocated grids 

      Santos Serrano, Daniel; Trias Miquel, Francesc Xavier; Colomer Rey, Guillem; Pérez Segarra, Carlos David (Scipedia, 2022)
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      Preservation of energy is fundamental in order to avoid the introduction of unphysical energy that can lead to unstable simulations. In this work, an energy-preserving unconditionally stable fractional step method on ...

    • 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)
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      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 ...

    • Coupled radiation and natural convection: Different approaches of the slw model for a non-gray gas mixture 

      Colomer Rey, Guillem; Consul Serracanta, Ricard; Oliva Llena, Asensio (2007-09)
      Article
      Accés obert
      The coupling between non-gray radiation heat transfer and convection–conduction heat transfer is studied. The spectral line weighted sum of gray gases model (SLW) is used to account for non-gray radiation properties. The ...

    • Development of a high accurate numerical platform for the thermal and optical optimization of linear Fresnel receivers 

      Guadamud Anchundia, Erick Alejandro; Chiva Segura, Jorge; Colomer Rey, Guillem; Farnós Baulenas, Joan; Al Mers, Ahmed; Rigola Serrano, Joaquim; Pérez Segarra, Carlos David (International Solar Energy Society, 2017)
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      This paper represents an advanced methodology for the detailed modeling of the heat transfer and fluids dynamics phenomena in Linear Fresnel receivers. The present work aims at modeling Linear Fresnel elements (e.g. ...

    • 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)
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      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 ...

    • 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)
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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 ...

    • Energy simulation of buildings with a modular object-oriented tool 

      Mohan Damle, Rashmin; Lehmkuhl Barba, Oriol; Colomer Rey, Guillem; Rodríguez Pérez, Ivette María (2011)
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      The aim of this work is to develop a modular object-oriented tool “NEST” (Numerical Edifice Simulation Tool) for the energy simulation of buildings, which can be coupled with a parallel CFD software. For this purpose, a ...

    • 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)
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      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 ...

    • Mixed convection in a ventilated 3D cavity : comparison of different LES models with experimental data 

      Mohan Damle, Rashmin; Lehmkuhl Barba, Oriol; Colomer Rey, Guillem (2011)
      Comunicació de congrés
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      The aim of this work is to contribute to the progress in the determination of indoor airflow in buildings and to explore the possibility of coarse grid CFDsimulations for room airflow in building energy programs. To do ...

    • Modelization of a molten salt thermal energy storage for concentrated solar power 

      Vera i Fernández, Jordi; Colomer Rey, Guillem; Sanmartí Perona, Oriol; Pérez Segarra, Carlos David (Scipedia, 2022)
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      A numerical model for studying a storage tank for concentrated solar power is presented. The model consists of solving the heat equation for the solid part made from ceramic materials, a one-dimensional model for the molten ...

    • Modular simulation of buildings with an object-oriented tool 

      Mohan Damle, Rashmin; Lehmkuhl Barba, Oriol; Colomer Rey, Guillem (2011)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      The objective of this work is to develop a modular object-oriented building simulation tool “NEST” (Numerical Edifice Simulation Tool) which can be coupled with a parallel CFD software. To do so, a building is modelled as ...

    • Numerical methods for radiative heat transfer 

      Colomer Rey, Guillem (Universitat Politècnica de Catalunya, 2006-06-26)
      Tesi
      Accés obert
      L'objectiu principal d'aquesta tesi es l'estudi de la transferència d'energia per radiació. Per aquest motiu, s'ha estudiat la fenomenologia bàsica de la transferencia de calor per radiació. Tenint en compte el tipus ...

    • Numerical simulations of conjugate convection combined with surface thermal radiation using an Immersed-Boundary Method 

      Favre Samarra, Federico; Colomer Rey, Guillem; Lehmkuhl Barba, Oriol; Oliva Llena, Asensio (Institute of Physics (IOP), 2016)
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      Dynamic and thermal interaction problems involving fluids and solids were studied through a finite volume based Navier-Stokes solver, combined with immersed-boundary techniques and the net radiation method. Source terms ...

    • Numerical simulations of turbulent natural convection coupled and uncoupled with radiation 

      Capdevila Paramio, Roser; Lehmkuhl Barba, Oriol; Trias Miquel, Francesc Xavier; Colomer Rey, Guillem; Pérez Segarra, Carlos David (2011)
      Comunicació de congrés
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      In the present work, turbulent natural convection in a tall differentially heated cavity of aspect ratio 5:1, filled with air (Pr = 0.7) under a Rayleigh number based on the height of 4.5 · 1010, is studied numerically. ...

    • Parallel algorithm for the solution of the Boltzmann transport equation on unstructured meshes 

      Colomer Rey, Guillem; Borrell Pol, Ricard; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David (2011)
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      The Boltzmann transport equation is solved by means of a parallel explicit algorithm known as parallel sweep, and a source iteration procedure to solve the coupling between different angular directions. Using an explicit ...

    • Parallel sweep-based preconditioner for the solution of the linear Boltzmann transport equation 

      Borrell Pol, Ricard; Colomer Rey, Guillem; Lehmkuhl Barba, Oriol; Rodríguez Pérez, Ivette María; Oliva Llena, Asensio (Elsevier, 2013-12-15)
      Article
      Accés restringit per política de l'editorial
      The Boltzmann transport equation is solved in the context of radiative heat transfer, for an isotropically scattering medium with reflecting boundaries. Under these circumstances, the different ordinates of the angular ...

    • 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 ...

    • Study of turbulent natural convection in a tall differentially heated cavity filled with either non-participating, participating grey and participating semigrey media 

      Capdevila Paramio, Roser; Lehmkuhl Barba, Oriol; Colomer Rey, Guillem; Pérez Segarra, Carlos David (Université de Poitiers, 2012)
      Text en actes de congrés
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      Turbulent natural couvection in a tall differentially heated cavity of aspect ratio 5:1, filled with air under a Rayleigh number based on the height of 4.5.10(10), is studied numerically. Three different situations have ...