Ara es mostren els items 108-127 de 151

    • Object-oriented simulation of reciprocating compressors: Numerical verification and experimental comparison 

      Mohan Damle, Rashmin; Rigola Serrano, Joaquim; Pérez Segarra, Carlos David; Castro González, Jesús; Oliva Llena, Asensio (2011-12-01)
      Article
      Accés restringit per política de l'editorial
      Numerical simulation of reciprocating compressors is important for the design, development, improvement and optimization of the elements constituting the compressor circuit. In this work, an object-oriented unstructured ...
    • On a high-order energy-preserving unconditionally stable discretization on collocated unstructured grids 

      Santos Serrano, Daniel; Trias Miquel, Francesc Xavier; Verstappen, R.W.C.P.; Pérez Segarra, Carlos David (European Research Community on Flow, Turbulence, and Conbustion (ERCOFTAC), 2023)
      Text en actes de congrés
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      In this work, an energy-preserving unconditionally stable fractional step method on collocated unstructured grids is presented. Its formulation is based on preserving the underlying symmetries of the differential operators. ...
    • On coupled level set-volume of fluid approaches for numerical simulation of multiphase flows on unstructured grids 

      Amani, Ahmad; Pérez Segarra, Carlos David; Oliva Llena, Asensio (European Research Community on Flow, Turbulence, and Conbustion (ERCOFTAC), 2023)
      Comunicació de congrés
      Accés obert
      The Piecewise-Linear-Interface-Calculation (PLIC) reconstruction algorithm in the Volume-of-Fluid (VOF) method is widely used in numerical simulations of interfacial flows across various fields. However, a significant ...
    • On DNS and LES of natural convection of wall-confined flows: Rayleigh-Bénard convection 

      Rodríguez Pérez, Ivette María; Lehmkuhl Barba, Oriol; Borrell Pol, Ricard; Pérez Segarra, Carlos David (Springer, 2010)
      Text en actes de congrés
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    • On self-adaptive Runge-Kutta schemes with improved energy-conservation properties 

      Plana Riu, Josep; Trias Miquel, Francesc Xavier; Pérez Segarra, Carlos David; Oliva Llena, Asensio (European Research Community on Flow, Turbulence, and Conbustion (ERCOFTAC), 2023)
      Text en actes de congrés
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      In this paper a novel approach to the computation of the eigenbounds of the system of ordinary differential equations is presented. Afterwards, this approach is applied for different Runge-Kutta methods with various ...
    • On the extension of LES methods from incompressible to compressible turbulent flows with application to turbulent channel flow 

      Pedro Costa, Juan Bautista; Baez Vidal, Aleix; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David; Oliva Llena, Asensio (Institute of Physics (IOP), 2016)
      Text en actes de congrés
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      The objective of the present work is to validate the compressible Large-Eddy Simulation (LES) models implemented in the in house parallel unstructured CFD code TermoFluids. Our research team has implemented and tested ...
    • On the extension of RANS/LES methods from incom-pressible to compressible transonic turbulent flows with SBLI 

      Pedro Costa, Juan Bautista; Baez Vidal, Aleix; Lehmkuhl Barba, Oriol; Pérez Segarra, Carlos David; Oliva Llena, Asensio (Begell House, 2015)
      Text en actes de congrés
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      In the present work, a compressible extension of the incompressible RANS and LES models implemented in TermoFluids is carried out. The objective is to solve compressible turbulent flows, i.e. high-Reynolds and high-Mach ...
    • On the feasibility of affordable high-fidelity CFD simulations for indoor environment design and control 

      Morozova, Nina; Trias Miquel, Francesc Xavier; Capdevila Paramio, Roser; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2020-10-15)
      Article
      Accés obert
      Computational fluid dynamics (CFD) is a reliable tool for indoor environmental applications. However, accurate CFD simulations require large computational resources, whereas significant cost reduction can lead to unreliable ...
    • On the properties of discrete spatial filters for CFD 

      Baez Vidal, Aleix; Lehmkuhl Barba, Oriol; Trias Miquel, Francesc Xavier; Pérez Segarra, Carlos David (2016-12-01)
      Article
      Accés obert
      The spatial filtering of variables in the context of Computational Fluid Dynamics (CFD) is a common practice. Most of the discrete filters used in CFD simulations are locally accurate models of continuous operators. However, ...
    • On 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 (2010)
      Text en actes de congrés
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      Traditionally turbulence modeling of industrial flows in complex geometries have been solved using RANS models and unstructured meshes based solvers. The lack of precision of RANS models in these situations and the increase ...
    • Optimization of the thermal and fluid dynamic behaviour of air curtains: analysis of the plenum by means of LES 

      Giráldez García, Héctor; Pérez Segarra, Carlos David; Rodríguez Pérez, Ivette María; Oliva Llena, Asensio (2012)
      Text en actes de congrés
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      The improvement procedure of an air curtain unit (ACU) is described in the present study. The procedure is based on Large Eddy Simulations (LES) and Hot Wire Anemometry (HWA) measurements. Initially, the flow provided by ...
    • 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)
      Comunicació de congrés
      Accés obert
      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 large eddy simulations of wind farms with the actuator line method 

      Baez Vidal, Aleix; Lehmkuhl Barba, Oriol; Martínez Valdivieso, Daniel; Pérez Segarra, Carlos David (Elsevier, 2013)
      Text en actes de congrés
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      Parallel Computation of wind farm Large Eddy Simulations (LES) requires the use of with Wind Turbine Models (WTM). CFD and WTM demand different domain decompositions as optimal CFD and WTM decompositions do not necessarily ...
    • Parallel Poisson solver for revolved unstructured grids. DNS of the flow around a sphere at Re = 3700. 

      Borrell Pol, Ricard; Lehmkuhl Barba, Oriol; Rodríguez Pérez, Ivette María; Pérez Segarra, Carlos David; Oliva Llena, Asensio (2009)
      Comunicació de congrés
      Accés restringit per política de l'editorial
      In this paper a parallel direct Poisson solver for DNS simulation of turbulent flows in domains of revolution using unstructured meshes is presented. It is based on a Fourier diagonalization in the azimuthal direction and ...
    • Parametric study of two-tank TES systems for CSP plants 

      Torras Ortiz, Santiago; Pérez Segarra, Carlos David; Rodríguez Pérez, Ivette María; Rigola Serrano, Joaquim; Oliva Llena, Asensio (2015-05)
      Article
      Accés obert
      The two-tank thermal energy storage (TES) system is the most used technology for storage in concentrating solar power (CSP) plants. This work focuses on a parametric study, which aims to identify the most important parameters ...
    • Pressure-velocity coupling on unstructured collocated grids: reconciling stability and energy-conservation 

      Santos Serrano, Daniel; Trias Miquel, Francesc Xavier; Hopman, Johannes Arend; Pérez Segarra, Carlos David (Begell House, 2023)
      Text en actes de congrés
      Accés restringit per política de l'editorial
      In this work, an energy-preserving unconditionally stable fractional step method on collocated unstructured grids is presented. Its formulation is based on preserving the underlying symmetries of the differential operators. ...
    • Recent developments in the design of a new air-cooled, hot-water-driven H2O-LiBr absorption chiller 

      Castro González, Jesús; Oliva Llena, Asensio; Pérez Segarra, Carlos David; Oliet Casasayas, Carles (ASHRAE, 2008)
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      This paper explains the up-to-date stage of development of an air-cooled H2O-LiBr absorption chiller. The methodology of development is based on the systematic application of advanced numerical and experimental techniques, ...
    • Regional aerosol deposition in the human airways: the SimInhale benchmark case and a critical assessment of in silico methods 

      Koullapis, P.; Kassinos, S.C.; Muela Castro, Jordi; Pérez Segarra, Carlos David; Rigola Serrano, Joaquim; Lehmkuhl Barba, Oriol; Cui, Y.; Sommerfeld, M.; Elcner, J.; Jicha, M.; Saveljic, I.; Filipovic, N.; Lizal, F.; Nicolaou, L. (2017-09-07)
      Article
      Accés obert
      Regional deposition effects are important in the pulmonary delivery of drugs intended for the topical treatment of respiratory ailments. They also play a critical role in the systemic delivery of drugs with limited lung ...
    • 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)
      Text en actes de congrés
      Accés obert
      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 ...
    • Resolución numérica de flujos laminares con estructura tridimensional axialsimétrica. Análisis de diferentes situaciones 

      Oliva, A.; Salom, J.; Costa, M.; Pérez Segarra, Carlos David (Centro Internacional de Métodos Numéricos en Ingeniería, 1994)
      Article
      Accés obert
      En el presente trabajo se implementa un algoritmo numérico basado en técnicas de diferencias finitas del tipo SIMPLE (Semi-Implicit Method for Pressure Linked Equations) para la resolución de las ecuaciones de conservación ...