Ara es mostren els items 1-20 de 64

  • A dynamic wall model for large eddy simulation on unstructured meshes. Application to wind turbine dedicated airfoils 

    Calafell Sandiumenge, Joan; Lehmkuhl Barba, Oriol; Rodríguez Pérez, Ivette María; Oliva Llena, Asensio; Pérez Segarra, Carlos David (Begell House, 2015)
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    Large eddy simulations (LES) of wall resolved flows at high Reynolds number are still computation-ally demanding. In the present work, a new Dynamic Wall Model (DWM) for LES is presented. The methodology, implemented on ...
  • A new thermocline-PCM thermal storage concept for CSP plants. Numerical analysis and perspectives 

    Galione Klot, Pedro Andrés; Pérez Segarra, Carlos David; Rodríguez Pérez, Ivette María; Lehmkuhl Barba, Oriol; Rigola Serrano, Joaquim (2013)
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    Thermocline storage concept has been considered for more than a decade as a possible solution to reduce the huge cost of the storage system in CSP plants. However, one of the drawbacks of this concept is the decrease in ...
  • 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 ...
  • 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)
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    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 ...
  • Coherent structures in a flow past a circular cylinder at critical and super-critical Reynolds numbers 

    Rodríguez Pérez, Ivette María; Lehmkuhl Barba, Oriol; Chiva Segura, Jorge; Borrell Pol, Ricard; Oliva Llena, Asensio (Springer, 2015)
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    It is well known that the wake topology in the flow past a circular cylinder remains almost unchanged up to Reynolds number ~105 Williamson (Annu Rev Fluid Mech 28(1), 477–539 (1996)) [1]. Then, at Re~2×105 major changes ...
  • Comparison of the performance of falling film and bubble absorbers for air-cooled absorption systems 

    Castro González, Jesús; Oliet Casasayas, Carles; Rodríguez Pérez, Ivette María; Oliva Llena, Asensio (2009-07-01)
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    Small capacity, air-cooled NH3–H2O absorption systems are becoming more attractive in applications where the input energy can be obtained for free (e.g., solar energy, exhaust gases of engines, etc.), due to the increasing ...
  • Coupling CFD models of airflow with building simulation with an object-oriented and parallel infrastructure 

    Damle, Rashmin; Lehmkuhl Barba, Oriol; Rodríguez Pérez, Ivette María; Oliva Llena, Asensio (2012)
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    Integrating CFD & HT models with the general building program raises the computational time of building simulations as these simulations are usually performed over a period of one year. Within this context, our aim is ...
  • Detailed numerical model for the resolution of molten salt storage tanks for CSP plants 

    Pérez Segarra, Carlos David; Rodríguez Pérez, Ivette María; Oliva Llena, Asensio; Torras Ortíz, Santiago; Lehmkuhl Barba, Oriol (2012)
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    Considering the state-of-the-art in TES technologies, two-tank indirect system using molten salt is the most widespread within CSP plants. However, current techniques for design and optimization, as well as, for assessing ...
  • Development of a multi-functional ventilated façade with an integrated collector-storage: numerical model and experimental facility 

    Kizildag, Deniz; Rodríguez Pérez, Ivette María; Oliva Llena, Asensio (2011)
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    The paper reports on physical modeling and experimental evaluation of glazed systems. A multi-functional ventilated façade with an integrated collector-storage is developed and mounted on a test cell facility under real ...
  • Direct and large eddy simulations of non-Oberbeck-Boussinesq effects in a turbulent tall water-filled differentially heated cavity 

    Kizildag, Deniz; Rodríguez Pérez, Ivette María; Trias Miquel, Francesc Xavier; Oliva Llena, Asensio (2015)
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    The present work first submits to investigation the non-Oberbeck-Boussinesq (NOB) effects in a tall water-filled differentially heated cavity by means of direct numerical simulations. The results reveal that if NOB effects ...
  • Direct and large-eddy simulation of non-oberbeck-boussinesq effects in a turbulent differentially heated cavity 

    Kizildag, Deniz; Trias Miquel, Francesc Xavier; Rodríguez Pérez, Ivette María; Oliva Llena, Asensio (Springer, 2013)
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  • Direct numerical simulation and Large-Eddy simulations of the turbulent flow around a NACA-0012 airfoil 

    Lehmkuhl Barba, Oriol; Baez Vidal, Aleix; Rodríguez Pérez, Ivette María; Pérez Segarra, Carlos David (2011)
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    This paper investigates the capabilities of two subgrid-scale (SGS) models for predicting the complex flow in transitional separated bubbles. We consider here the flow over a NACA 0012 airfoil at Reynolds number Re = 5×10 ...
  • 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)
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    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)
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    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)
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    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 turbulent flow around a NACA 0012 airfoil at different angles of attack 

    Baez Vidal, Aleix; Lehmkuhl Barba, Oriol; Rodríguez Pérez, Ivette María; Pérez Segarra, Carlos David (2011)
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    Direct numerical simulations (DNS) of the flow dynamics over a NACA 0012 airfoil at Reynolds number Re = 5×104 at different angles of attack are presented. The dynamic of the large separation bubble, characterised by laminar ...
  • 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)
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    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 ...
  • 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 ...
  • 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)
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    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 ...
  • 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)
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    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). ...