Departament de Mecànica de Fluids

Recent Submissions

  • Wind turbine enhancement via active flow control implementation 

    Lahoz Fernández, Marc; Nabhani, Ahmad; Saemian, Mohammad; Bergadà Granyó, Josep Maria (Multidisciplinary Digital Publishing Institute, 2024-12-07)
    Article
    Open Access
    The present research enhances the efficiency of an airfoil section from the DTU-10MW Horizontal Axis Wind Turbine (HAWT) via Active Flow Control (AFC) implementation and when using synthetic jets (SJ). The flow around two ...

  • Natural mode splitting of a rotating disc in water at different wall distances as a model for high-head francis runners 

    Xia, Xiang; Moraga González, Greco Alonso; Presas Batlló, Alexandre; Zhengwei, Wang; Zhou, Lingjiu (2024-11)
    Article
    Restricted access - publisher's policy
    Francis turbines are essential equipments in the realm of sustainable energy production. However, their complex dynamics, particularly in the presence of fluid-structure interaction, pose significant challenges to optimising ...

  • The global flow state in a precessing cylinder 

    Giesecke, André; Vogt, Tobias; Pizzi, Federico; Kumar, Vivaswat; García González, Fernando; Gundrum, Thomas; Stefani, Frank (2024-11-10)
    Article
    Open Access
    We examine the fluid flow forced by precession of a rotating cylindrical container using numerical simulations and experimental flow measurements with ultrasonic Doppler velocimetry. The analysis is based on the decomposition ...

  • Energy dissipation and time-frequency analysis of characteristics induced by vortex breakdown in an axial flow pump 

    Song, Xijie; Jin, Yan; Wang, Zhengwei; Presas Batlló, Alexandre; Tang, Fangping; Liu, Chao (2024-06-01)
    Article
    Open Access
    Vortex breakdown in a pump sump is a complex and negative factor for the pump. Different from my previous study that focused mainly on the development process of vortex and its damage to the pump, this paper is from a new ...

  • Buoyant high-pressure transcritical fluid duct flows 

    Bandarrinha Monteiro, Carlos Alexandre; Jofre Cruanyes, Lluís (International Centre for Numerical Methods in Engineering (CIMNE), 2024)
    Conference report
    Open Access
    In this work, direct numerical simulations of a high-pressure transcritical square duct flow with distinct gravity directions in the cross-stream plane are performed. The buoyancy effects on the instantaneous and mean ...

  • Spatio-temporal analysis of the structures in high-pressure transcritical fluid flows 

    Barea Sánchez, Guillem; Jofre Cruanyes, Lluís (International Centre for Numerical Methods in Engineering (CIMNE), 2024)
    Conference report
    Open Access
    This study explores the principal modes of high-pressure transcritical channel f low from direct numerical simulation data. The four cases investigated correspond to CO2 at high-pressure conditions (P/Pc = 1.5) confined ...

  • Effects of turbulence boundary conditions on Spalart-Allmaras RANS simulations for active flow control applications 

    Monshi Tousi, Navid; Bergadà Granyó, Josep Maria; Mellibovsky Elstein, Fernando (2024-11-14)
    Article
    Open Access
    We assess the suitability of Reynolds-Averaged Navier–Stokes (RANS) simulation using the Spalart-Allmaras (SA) turbulence model as a closure in analysing the performance of fluidic Active Flow Control (AFC) applications. ...

  • Data-driven acceleration of statistical convergence in turbulent flows 

    Masclans Serrat, Núria; Jofre Cruanyes, Lluís (European Community on Computational Methods in Applied Sciences (ECCOMAS), 2024)
    Conference report
    Open Access
    Direct numerical simulations (DNS) provide accurate and reliable information for the physics discovery and modeling of turbulent flow phenomena, especially about their inherent multiscale nature in terms of kinematic and ...

  • Linear stability exploration of transcritical non-isothermal Poiseuille flows 

    Bernades, Marc; Capuano, Francesco; Jofre Cruanyes, Lluís
    Conference report
    Open Access
    High-pressure transcritical turbulent flow regimes enhance the mixing and heat transfer rates with respect to atmospheric pressure conditions. The two characteristic states of supercritical fluids, gas- and liquid-like, ...

  • Study on the design of short blade offset for the long and short blade runner of 1000 MW hydraulic turbine units 

    Lu, Yonggang; Zhang, Zequan; Chen, Hao; Liu, Kui; Huang, Xingxing; Li, Honghui; Wang, Zhengwei; Presas Batlló, Alexandre (Institute of Physics (IOP), 2024-06-01)
    Article
    Open Access
    For such complex rotating machinery as hydraulic turbine, the hydraulic operation characteristics of the hydraulic turbine unit are significantly impacted by the short blade of the runner used as the splitter blade. To ...

  • The use of model-based voltage and current analysis for torque oscillation detection and improved condition monitoring of centrifugal pumps 

    Han, Yuejiang; Zou, Jiamin; Gong, Bo; Luo, Yin; Wang, Longyan; Presas Batlló, Alexandre; Yuan, Jianping; Wang, Chao (2025-01-01)
    Article
    Open Access
    Condition Monitoring is essential for the early fault detection and the enhancement of operational efficiency in centrifugal pumps. Motor current signature analysis (MCSA) is a well-established non-intrusive technique for ...

  • Assessment of fiber bragg grating sensors for monitoring induced strains on the draft tube cone of hydraulic turbines 

    Sánchez Botello, Xavier; Roig Bauzà, Rafel; Torre Rodríguez, Óscar de la; Madrigal, Javier; Sales, Salvador; Mulu, Berhanu; Högström, Carl-Maikel; Escaler Puigoriol, Francesc Xavier (Institute of Physics (IOP), 2023)
    Conference report
    Open Access
    In hydraulic turbines, several flow instabilities can take place inside the draft tube cone during off-design and transient operating conditions such as the rotating vortex rope which can severely damage the structure if ...

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