Now showing items 1-20 of 119

  • 3D compressible simulation of a muffler with pseudosound prediction levels 

    Ruano Pérez, Jesús; López Mas, Joan; Lehmkuhl Barba, Oriol; Rigola Serrano, Joaquim; Pérez Segarra, Carlos David (Purdue University, 2016)
    Conference lecture
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    The main objective of this paper is to present a numerical resolution of a suction muffler configuration by using an in-house object oriented CFD & HT code TermoFluids (Lehmkuhl et al. 2007), able to handle tridimensional ...
  • Advanced analysis of thermal energy storage in CSP plants 

    Pérez Segarra, Carlos David; González Acedo, Ignacio; Torras Ortiz, Santiago; Rigola Serrano, Joaquim; Oliva Llena, Asensio (2016-11-24)
    External research report
    Open Access
  • A dynamic load balancing method for the evaluation of chemical reaction rates in parallel combustion simulations 

    Muela Castro, Jordi; Borrell Pol, Ricard; Ventosa Molina, Jordi; Jofre Roca, Lluís; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David (Elsevier, 2019-08-15)
    Article
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    The development and assessment of an efficient parallelization method for the evaluation of reaction rates in combustion simulations is presented. Combustion simulations where the finite-rate chemistry model is employed ...
  • 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)
    Conference report
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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 filtered kinetic energy preserving finite volumes scheme for compressible flows 

    Baez Vidal, Aleix; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2012)
    Conference report
    Open Access
    The Kinetic Energy Preserving Scheme (KEP) for compressible flows has been shown to solve 1-D shock waves without smearing them. The method does not add numerical diffusion to solutions but, as a counterpart, it needs ...
  • A finite volume method to solve the frost growth using dynamic meshes 

    Bartrons Casademont, Eduard; Oliet Casasayas, Carles; Gutiérrez Álvarez, Enrique; Naseri, Alireza; Pérez Segarra, Carlos David (2018-09-01)
    Article
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    The physical mechanisms of frost formation have been widely studied, yet much empirism is still needed in numerical approaches. Indeed, accurate simulations of frost growth can be reached by setting up a specific combination ...
  • A fluid-structure interaction solver for the fluid flow through reed type valves 

    González Acedo, Ignacio; Naseri, Alireza; Rigola Serrano, Joaquim; Pérez Segarra, Carlos David; Oliva Llena, Asensio (Institute of Physics (IOP), 2017)
    Conference lecture
    Open Access
    Suction and discharge processes with self actuated valves have a major influence in efficiency and reliability of hermetic reciprocating compressors. Understanding the operation completely in order to enhance compressor's ...
  • A load balancing method for parallel genetic CFD optimizations 

    Aizpurua Udabe, Imanol; Lehmkuhl Barba, Oriol; Borrell Pol, Ricard; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2015)
    Conference report
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    CFD optimizations are characterized by long and highly variable objective function evaluation times. The aim of this study is to improve the parallel performance using a new load balancing master-worker parallelization ...
  • A method for fluid-structure interaction problems with non-Newtonian fluid 

    Amani, Ahmad; Naseri, Alireza; Pérez Segarra, Carlos David; Oliva Llena, Asensio (International Centre for Numerical Methods in Engineering (CIMNE), 2018)
    Conference lecture
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    This paper represents a numerical method to solve fluid-structure interaction (FSI) problems where the fluid exhibits a non-Newtonian Viscoelastic behaviour. Oldroyd-B constitutive equation is used to model Viscoelastic fluid. ...
  • A methodology for determining optimum solar tower plant configurations and operating strategies to maximize profits based on hourly electricity market prices and tariffs 

    Guedez, Rafael; Topel, Monica; Conde, Ines; Ferragut, Francisco; Callaba, Irene; Spelling, James; Hassar, Zhor; Pérez Segarra, Carlos David; Laumert, Bjorn (2016-04-01)
    Article
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    The present study analyzes the influence that market conditions have on determining optimum molten salt solar tower plants with storage that maximizes profits (in terms of plant configuration, sizing, and operation) for a ...
  • Analysis of fin-and-tube evaporators in no-frost domestic refrigerators 

    Oliet Casasayas, Carles; Pérez Segarra, Carlos David; Rigola Serrano, Joaquim; Oliva Llena, Asensio (2010)
    Conference lecture
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    This paper summarizes the research work carried out by the authors on domestic refrigerator no-frost evaporators. It includes an explanation of the experimental unit that is currently being constructed to test isobutane ...
  • 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)
    Article
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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 ...
  • Analysis of vapour-compression refrigerating systems 

    Sadurní Caballol, Alexandre; Oliet Casasayas, Carles; Rigola Serrano, Joaquim; Pérez Segarra, Carlos David (2011)
    Conference lecture
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    The aim of this paper is to show the authors proposal for steady state numerical simulation of Vapour-Compression Refrigerating Systems (dry expansion, liquid overfeed systems, ...). The developed tool allows using different ...
  • An enhanced finite volume based solver for thermoelastic materials in fluid-structure coupled problems 

    González Acedo, Ignacio; Naseri, Alireza; Chiva Segura, Jorge; Rigola Serrano, Joaquim; Pérez Segarra, Carlos David (2018)
    Conference report
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  • 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)
    Conference report
    Open Access
    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 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)
    Conference report
    Open Access
    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 ...
  • An immersed boundary method to conjugate heat transfer problems in complex geometries. Application to an automotive antenna 

    Favre, F.; Antepara Zambrano, Óscar; Oliet Casasayas, Carles; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David (2019-02-05)
    Article
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    Considering that the most common reason for electronic component failure is the excessive temperature level, an efficient thermal management design can prolong the operating life of the equipment, while also increasing its ...
  • A parallel three-dimensional radial basis function interpolation method for unstructured dynamic meshes 

    Estruch Pérez, Olga; Lehmkuhl Barba, Oriol; Borrell Pol, Ricard; Pérez Segarra, Carlos David (2011)
    Conference lecture
    Open Access
    A radial basis function (RBF) interpolation method is implemented to be applied in computational fluid dynamics (CFD) problems with dynamic meshes. It is compared with the classic springs analogy smoothing, focusing on the ...
  • A second-order time accurate semi-implicit method for fluid–structure interaction problems 

    Naseri, Alireza; González Acedo, Ignacio; Amani, Ahmad; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2019-04-01)
    Article
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    This paper is concerned with numerical solution of fluid-structure inter-action (FSI) problems involving an incompressible viscous flow and an elasticstructure. A semi-implicit partitioned method with second-order ...
  • 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)
    Article
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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 ...