Now showing items 21-40 of 54

    • Influence of cavitation on the dynamic response of hydrofoils 

      Torre Rodríguez, Oscar de la (Universitat Politècnica de Catalunya, 2013-02-26)
      Doctoral thesis
      Open Access
      The dynamic response of any structure submerged in water is significantly modified by the effect of added mass. The inertia of the fluid that the body must accelerate during its vibrational motion decreases its natural ...
    • Large eddy simulation of partial cavitation around a 2D plane-convex hydrofoil 

      Hidalgo, V.; Escaler Puigoriol, Francesc Xavier; Soto, R.; Valencia, E.; Cando, E.; Luo, X. (2015-02-02)
      Article
      Open Access
      Investigations of attached partial cavitation are important because to prevent damages in hydrulic machinery and to reduce the costs. As expected computational fluid dynamics (CFD) methods have been developed for more ...
    • Large Eddy Simulation of the transient cavitating vortical flow in the wake of a hydrofoil 

      Chen, Jian; Geng, Linlin; Escaler Puigoriol, Francesc Xavier (2021)
      Conference report
      Open Access
      The Zwart mixture cavitation model and the Large Eddy Simulation (LES) turbulence model have been combined to simulate the transient cavitating flow in the wake of a hydrofoil. The hydrofoil is a 2D NACA0009 with a truncated ...
    • Mapping Venturi cavitation in a new closed loop facility devoted to study thermodynamic effects 

      Bermejo Plana, David; Escaler Puigoriol, Francesc Xavier; Ruiz Mansilla, Rafael (Shanghai University Press, 2019)
      Conference report
      Restricted access - publisher's policy
      The influence of cavitation in water heating processes is still an unknown issue. To develop such knowledge, Universitat Politècnica de Catalunya-BarcelonaTech (UPC), in collaboration with the Spanish environmental engineering ...
    • Mass transfer rate effects on the cavitating vortex shedding flow around a circular cylinder at low Reynolds number 

      Chen, Jian; Escaler Puigoriol, Francesc Xavier (2021)
      Conference report
      Open Access
      Cavitating vortex shedding is a flow phenomenon commonly encountered behind bluff bodies in hydraulic machinery and systems and the generated vapor bubbles significantly change the dynamic behavior of the vortices. In ...
    • Measurement of the Influence of Sheet Cavitation on the Heat Generated in a Closed Loop Pumping System 

      Bermejo Plana, David; Escaler Puigoriol, Francesc Xavier; Dular, Matevž; Ruiz Mansilla, Rafael (2021)
      Conference lecture
      Restricted access - publisher's policy
      The so-called hydrodynamic heat generators are claimed as high efficiency heating devices, avoiding scaling by warming liquids without transfer surface with the help of cavitation effects. However, neither the mechanisms ...
    • Mesh dependence analysis for simulating unsteady cavitation around a plane convex hydrofoil 

      Puga, Diana; Escaler Puigoriol, Francesc Xavier; Hidalgo Díaz, Víctor Hugo; Luo, Xianwu (IOP Publishing, 2022)
      Conference report
      Open Access
      The mesh significantly influences the quality of the numerical results in computational fluid dynamics (CFD) problems due to its correlation with turbulence models. In the present paper a structured mesh was generated using ...
    • Natural convection in a horizontal cylinder with axial rotation 

      Sánchez Casals, Odalys de la Caridad; Mercader Calvo, María Isabel; Batiste Boleda, Oriol; Alonso Maleta, María Aránzazu (AMER PHYSICAL SOC, 2016-06-23)
      Article
      Open Access
      We study the problem of thermal convection in a laterally heated horizontal cylinder rotating about its axis. A cylinder of aspect ratio Gamma = H/2R = 2 containing a small Prandtl number fluid (sigma = 0.01) representative ...
    • Numerical evaluation of cavitation void ratio significance on hydrofoil dynamic response 

      Liu, Xin; Wang, Zhengwei; Escaler Puigoriol, Francesc Xavier; Zhou, Lingjiu (Institute of Physics (IOP), 2015)
      Conference report
      Open Access
      The added mass effects on a NACA0009 hydrofoil under cavitation conditions determined in a cavitation tunnel have been numerically simulated using finite element method (FEM). Based on the validated model, the effects of ...
    • Numerical investigation of the cavitation effect on natural frequencies of a hydrofoil 

      Liu, Xin; Zhou, Lingjiu; Escaler Puigoriol, Francesc Xavier; Wang, Zhengwei (2016)
      Conference report
      Open Access
      The added mass effects on a NACA0009 hydrofoil under cavitation conditions determined in a cavitation tunnel have been numerically simulated using finite element method (FEM). Based on the validated model, the effects of ...
    • Numerical investigation of the cavitation effects on the vortex shedding from a hydrofoil with blunt trailing edge 

      Chen, Jian; Geng, Linlin; Escaler Puigoriol, Francesc Xavier (Multidisciplinary Digital Publishing Institute (MDPI), 2020-11-21)
      Article
      Open Access
      Vortex cavitation can appear in the wake flow of hydrofoils, inducing unwanted consequences such as vibrations or unstable behaviors in hydraulic machinery and systems. To investigate the cavitation effects on hydrofoil ...
    • Numerical simulation of added mass effects on a hydrofoil in cavitating flow using acoustic FSI 

      Liu, Xin; Zhou, Lingjiu; Wang, Zhengwei; Escaler Puigoriol, Francesc Xavier; Luo, Yongyao; Torre Rodríguez, Oscar de la (2016-11-14)
      Article
      Restricted access - publisher's policy
      A fluid-structure interaction system has been solved using the coupled acoustic structural finite element method to simplify the cavitating flow conditions around a hydrofoil. The modes of vibration and the added mass ...
    • Numerical simulation of cavitation erosion aggressiveness induced by unsteady cloud cavitation 

      Geng, Linlin; Chen, Jian; Torre Rodríguez, Óscar de la; Escaler Puigoriol, Francesc Xavier (Multidisciplinary Digital Publishing Institute, 2020-08-01)
      Article
      Open Access
      A numerical investigation of the erosion aggressiveness of leading edge unsteady cloud cavitation based on the energy balance approach has been carried out to ascertain the main damaging mechanisms and the influence of the ...
    • Numerical simulation of cavitation erosion on a NACA0015 hydrofoil based on bubble collapse strength 

      Hidalgo, Victor; Luo, Xianwu; Escaler Puigoriol, Francesc Xavier; Huang, R; Valencia, E (Institute of Physics (IOP), 2015)
      Conference report
      Open Access
      The prediction of erosion under unsteady cavitation is crucial to prevent damage in hydraulic machinery. The present investigation deals with the numerical simulation of erosive partial cavitation around a NACA0015 hydrofoil. ...
    • Numerical simulation of cavitation in a Francis runner 

      Roig Bauzà, Rafel (Universitat Politècnica de Catalunya, 2017-06-15)
      Master thesis
      Open Access
      Nowadays, two of the more important challenges for the humanity are the climate change and the management of the energy. For this reason the performance of a machine for the conversion of renewable energy has been studied ...
    • Numerical simulation of cavitation in a Venturi type section. 

      Poncon, Cyprien (Universitat Politècnica de Catalunya, 2019-07-04)
      Tutored research work
      Open Access
      The objective is to develop a numerical model to simulate with ANSYS the cavitation development inside a Venturi type test section under different hydrodynamic conditions. For that, a series of experimental tests carried ...
    • Numerical simulation of cavitation-erosion on a plane-convex hydrofoil using a homogeneous mixture assumption 

      Hidalgo, V.; Luo, Xianwu; Escaler Puigoriol, Francesc Xavier; Valencia, E.; Cando, E.; Yang, D. (2016)
      Conference report
      Restricted access - publisher's policy
      A better understanding of the cavitation-erosion mechanism is important to improve the prediction of the affected region under unsteady cavitation condition. For that, a new model has been proposed to estimate the microjet ...
    • Numerical simulation of the micro-jet velocity and cavitation-erosion on an axisymmetric nozzle 

      Hidalgo, V.; Escaler Puigoriol, Francesc Xavier; Luo, Xianwu; Valencia, E. (2018)
      Conference report
      Open Access
      The present study deals with the numerical study of the micro-jet velocity and the cavitation - erosion on an axisymmetric nozzle, which presents high ow unsteadiness and aggressiveness. The proposed model is based on ...
    • Posada en marxa d’un sistema de mesures en un túnel de cavitació 

      Sánchez Botello, Xavier (Universitat Politècnica de Catalunya, 2018-06-21)
      Bachelor thesis
      Open Access
      Covenantee:   Condorchem Envitech
      Actualment l’enginyeria mediambiental de tractament d’efluents industrials Condorchem Envitech, S.L. està realitzant un estudi científic per a cercar una font de calor alternativa per millorar la generació de calor en els ...
    • Prediction of cavitation erosion with different erosion risk indicators 

      Geng, Linlin; Zhang, Dingli; Chen, Jian; Torre Rodríguez, Óscar de la; Escaler Puigoriol, Francesc Xavier (2022-02)
      Article
      Restricted access - publisher's policy
      This present work devoted to simulate the unsteady cavitating flow around a hydrofoil and assess its erosion power predicted by different erosion risk indicators. For that, the behavior of unsteady cloud cavity is numerically ...