Now showing items 1-12 of 412

    • On the implementation of flux limiters in algebraic frameworks 

      Valle Marchante, Nicolás; Álvarez Farré, Xavier; Gorobets, Andrei; Castro González, Jesús; Oliva Llena, Asensio; Trias Miquel, Francesc Xavier (2022-02-01)
      Article
      Open Access
      The use of flux limiters is widespread within the scientific computing community to capture shock dis- continuities and are of paramount importance for the temporal integration of high-speed aerodynamics, multiphase flows ...
    • A new general method to compute dispersion errors on Cartesian stretched meshes for both linear and non-linear operators 

      Ruano Pérez, Jesús; Baez Vidal, Aleix; Rigola Serrano, Joaquim; Trias Miquel, Francesc Xavier (2022-02-01)
      Article
      Restricted access - publisher's policy
      The present article presents a new analysis for the dispersion error and the methodology to evaluate it numerically. Here we present the spectral properties of several convective schemes, including non-linear ones, on ...
    • Energy and exergy analysis of an absorption system with working pairs LiBr-H2O and Carrol-H2O at applications of cooling and heating 

      Zheng, Jian; Castro González, Jesús; Oliva Llena, Asensio; Oliet Casasayas, Carles (2021-12-01)
      Article
      Restricted access - publisher's policy
      In this work, an air-cooled, single effect solar-driven absorption system is being evaluated from the point of view of 1 and 2 thermodynamic principles for two different applications: absorption chiller and heat pump. One ...
    • First test field performance of highly efficient flat plate solar collectors with transparent insulation and low-cost overheating protection 

      Kizildag, Deniz; Castro González, Jesús; Kessentini, Hamdi; Schillaci, Eugenio; Rigola Serrano, Joaquim (2022-04)
      Article
      Restricted access - publisher's policy
      The present work demonstrates prototypes of highly efficient flat plate solar thermal collectors prototypes based on transparent insulation materials (TIM) technology for efficiency improvement and an overheating protection ...
    • Intercomparison of Radon Flux Monitors at Low and at High Radium Content Areas under Field Conditions 

      Rábago, Daniel; Quindós, Luis; Vargas Drechsler, Arturo; Sainz, Carlos; Radulescu, Ileana; Razvan Ioan, Mihail; Cardellini, Francesco; Capogni, Marco; Rizzo, Alessandro; Celaya, Santiago; Fuente, Ismael; Fuente, Marta; Grossi, Claudia; Rodríguez, Maria (2022-04-01)
      Article
      Open Access
      Interlaboratory exercises are a good tool to compare the response of different systems to the same quantity and to identify possible inconsistencies between them. One of the main goals of the EMPIR 19ENV01 traceRadon project ...
    • Exergetic model of a small-scale, biomass-based CCHP/HP system for historic building structures 

      Wegener, Moritz; Isalgué Buxeda, Antonio; Malmquist, Anders; Martin, Andrew; Santarelli, Massimo; Arranz Piera, Pol; Camara Moreno, Osar (Elsevier, 2021-12)
      Article
      Open Access
      Biomass-based, small-scale Combined Cooling, Heating and Power (CCHP) systems can increase the energy autonomy of building complexes while reducing their Greenhouse Gases (GHG) emissions. In combination with air-to-water ...
    • Electro-responsive shape-memory composites obtained via dual-curing processing 

      Russo, Claudio; Ramirez Falo, José Luis; Fernández Francos, Xavier; Flor López, Sílvia de la (2022-01-01)
      Article
      Open Access
      In this work, electro-responsive shape-memory actuators were developed by incorporating a conductive heater in a dual-curing thiol-acrylate-epoxy shape-memory polymer (SMP). A conductive heater, consisting of an electrically ...
    • A Framework to Project Future Rainfall Scenarios: An Application to Shallow Landslide-Triggering Summer Rainfall in Wanzhou County China 

      Ferrer Roman, Joaquin; Guo, Zizheng; Medina Iglesias, Vicente César de; Puig i Polo, Càrol; Hurlimann Ziegler, Marcel (2022-03-01)
      Article
      Open Access
      Fatal landslides are a widespread geohazard that have affected millions of people and have claimed the lives of thousands around the globe. A change in climate has significantly increased the frequency and magnitude of ...
    • Effects of Rotation on the Flow Structure in a Compressor Cascade 

      Ventosa Molina, Jordi; Koppe, Björn; Lange, Martin; Mailach, Ronald; Fröhlich, Jochen (2022-08-01)
      Article
      Restricted access - publisher's policy
      In turbomachines, rotors and stators differ by the rotation of the former. Hence, half of each stage is directly influenced by rotation effects. The influence of rotation on the flow structure and its impact on the performance ...
    • Study of Relative Endwall Motion Effects in a Compressor Cascade Through Direct Numerical Simulations 

      Ventosa Molina, Jordi; Lange, Martin; Mailach, Ronald; Fröhlich, Jochen (2021-01-01)
      Article
      Restricted access - publisher's policy
      Linear cascades are commonly used as surrogate geometries when performing fundamental studies of turbomachinery blading. Several effects are not accounted for in linear cascades, such as the relative motion between blade ...
    • Analysis of the Near-Wall Flow in a Turbine Cascade by Splat Visualization 

      Nsonga, Baldwin; Scheuermann, Gerik; Gumhold, Stefan; Ventosa Molina, Jordi; Koschichow, Denis; Fröhlich, Jochen (2020-01)
      Article
      Open Access
      Turbines are essential components of jet planes and power plants. Therefore, their efficiency and service life are of central engineering interest. In the case of jet planes or thermal power plants, the heating of the ...
    • Near-Wall Flow in Turbomachinery Cascades—Results of a German Collaborative Project 

      Engelmann, David; Sinkwitz, Martin; di Mare, Francesca; Koppe, Björn; Mailach, Ronald; Ventosa Molina, Jordi; Fröhlich, Jochen; Schubert, Tobias; Niehuis, Reinhard (Multidisciplinary Digital Publishing Institute (MDPI), 2021-05-08)
      Article
      Open Access
      This article provides a summarizing account of the results obtained in the current collabora-tive work of four research institutes concerning near-wall flow in turbomachinery. Specific questions regarding the influences ...