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  • On Preconditioning Variable Poisson Equation with Extreme Contrasts in the Coefficients 

    Alsalti Baldellou, Àdel; Trias Miquel, Francesc Xavier; Gorobets, Andrey; Oliva Llena, Asensio (International Centre for Numerical Methods in Engineering (CIMNE), 2021)
    Conference report
    Open Access
    It is well known that the solution by means of iterative methods of very ill-conditioned systems leads to very poor convergence rates. In this context, preconditioning becomes crucial in order to modify the spectrum of the ...
  • Simulation of fluid-structure interaction and impact force on a reed valve 

    Castrillo Green, Pablo; Schillaci, Eugenio; Rigola Serrano, Joaquim (2021)
    Conference report
    Open Access
    The cyclic impact force between a reed valve and the seat plate is the main reason of the valve failure in many thermo-technical devices as compressors, engines, etc. According to experimental observations the latter is ...
  • Experimental and numerical analysis of reed valve movement in an impact fatigue test system and reciprocating compressors 

    Tofique, Muhammad Waqas; Löf, Alexander; Schillaci, Eugenio; Castrillo Green, Pablo; Rigola Serrano, Joaquim (Purdue University, 2021)
    Conference report
    Restricted access - publisher's policy
    During operation of a reciprocating compressor, its flapper valve opens to allow the passage of gases and closes by striking against the valve impact plate. This reed valve movement and impact is repeated billions of times. ...
  • Power electronics high performance air-cooled heat sinks integrating graphite based materials 

    Oliet Casasayas, Carles; Mullen, David; Hoell, Klaus; Cochrane, Nathan; Preishuber-Pfluegl, Florian; Rigola Serrano, Joaquim; Bouton, Mathieu; Pontrucher, Marc; Castrillo Green, Pablo; Santos Serrano, Daniel; Schillaci, Eugenio; McKay, Connor; Halimic, Elvedin; Freismuth, Juergen (Purdue University, 2021)
    Conference report
    Restricted access - publisher's policy
    The thermal management of the power electronics cooling in the aircraft is getting more attention in the recent years due to the progressive implementation of electrical systems, especially in the framework of the more ...
  • Subgrid-Scale Model Based on the Invariants of the Gradient Model Tensor 

    Folch Flórez, David; Trias Miquel, Francesc Xavier; Gorobets, A.; Oliva Llena, Asensio (2021)
    Conference report
    Open Access
    The incompressible Navier-Stokes equations stand as the best mathematical model for turbulent flows. However, direct numerical simulations at high Reynolds numbers are not yet feasible because the convective term produces ...
  • A symmetry-preserving second-order time-accurate PISO-based method 

    Komen, E.M.J.; Hopman, Johannes Arend; Frederix, E.M.A.; Trias Miquel, Francesc Xavier; Verstappen, Roel (Elsevier, 2021-07-15)
    Article
    Restricted access - publisher's policy
    A new conservative symmetry-preserving second-order time-accurate PISO-based pressure-velocity coupling for solving the incompressible Navier-Stokes equations on unstructured collocated grids is presented in this paper. ...
  • Surface tension and contact angle measurement of LiBr and Carrol solution 

    Zheng, Jian; Castro González, Jesús; Oliet Casasayas, Carles; Oliva Llena, Asensio (Technishe Universität Berlin, 2021)
    Conference report
    Open Access
    The surface tension and contact angle play a relevant role in the heat and mass transfer for the absorption system working pairs. However, LiBr aqueous solution surface tension/contact angle studies are limited and for ...
  • Development of a reduced order model of solar heat gains prediction 

    Tamm, Meril; Macià, Jordi; Capdevila Paramio, Roser; Farnós Baulenas, Joan; Thalfeldt, Martin; Kurnitski, Jarek (2020-12-01)
    Article
    Open Access
    The aim of this study was to elaborate and validate a reduced order model able to forecast solar heat gains as a function of the architectural parameters that determine the solar heat gains. The study focused on office ...
  • A comprehensive simulation tool for adsorption-based solar-cooled buildings. Control strategy based on variable cycle duration 

    Papakokkinos, Giorgos; Castro González, Jesús; Capdevila Paramio, Roser; Damble, Rashmin (2021-01-15)
    Article
    Restricted access - publisher's policy
    Adsorption cooling systems (ACS) may contribute towards a sustainable way of satisfying the increasing cooling demand, as they utilize solar thermal energy and employ non-ozone-depleting substances. Apart from the intrinsic ...
  • A scalable framework for the partitioned solution of fluid-structure interaction problems 

    Naseri, Alireza; Totounferoush, Amin; González Acedo, Ignacio; Mehl, Miriam; Pérez Segarra, Carlos David (Springer, 2020-08)
    Article
    Open Access
    In this work, we present a scalable and efficient parallel solver for the partitioned solution of fluid–structure interaction problems through multi-code coupling. Two instances of an in-house parallel software, TermoFluids, ...
  • 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
    Restricted access - publisher's policy
    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 ...
  • A hierarchical parallel implementation for heterogeneous computing. Application to algebra-based CFD simulations on hybrid supercomputers 

    Álvarez Farré, Xavier; Gorobets, Andrey; Trias Miquel, Francesc Xavier (Elsevier, 2021-01)
    Article
    Restricted access - publisher's policy
    The quest for new portable implementations of simulation algorithms is motivated by the increasing variety of computing architectures. Moreover, the hybridization of high-performance computing systems imposes additional ...

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