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On the added modal coefficients of a rotating submerged cylinder induced by a whirling motion. Part 2: Numerical investigation
(Multidisciplinary Digital Publishing Institute (MDPI), 2023-09-19)
Article
Open AccessPart 2 of this work presents a numerical methodology, validated using the experimental results presented in Part 1, to calculate the added modal coefficients of a submerged cylinder in water both when it oscillates and ... -
Water saving options in hydropower by means of variable speed operation: a prototype study in a mid-head Francis turbine
(Elsevier, 2023-06-22)
Article
Open AccessNowadays, in order to mitigate the global warming effects, there is a need of renewable energy generation for the objective of carbon neutrality. In this context, hydropower plays a key role not only because the amount of ... -
Fatigue damage analysis of a Kaplan turbine model operating at off-design and transient conditions
(2023-09-07)
Article
Open AccessThe current renewable energy market forces hydraulic turbines to operate for longer periods of time at off-design and transient conditions. Their life expectancy is then decreased due to the wear provoked by flow instabilities ... -
Kinetic-energy- and pressure-equilibrium-preserving schemes for real-gas turbulence in the transcritical regime
(2023-09-04)
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Open AccessNumerical simulations of compressible turbulent flows governed by real-gas equations of state, such as high-pressure transcritical flows, are strongly susceptible to instabilities. In addition to the inherent multi-scale ... -
On the added modal coefficients of a rotating submerged cylinder induced by a whirling motion. Part 1: Experimental investigation
(Multidisciplinary Digital Publishing Institute (MDPI), 2023-09-08)
Article
Open AccessThe operation of submerged rotating machines, such as marine current or tidal turbines, can present deleterious fluid phenomena that may provoke extreme structural vibrations. To predict their dynamic responses, it is ... -
A review of thermal exposure and fire spread mechanisms in large outdoor fires and the built environment
(2023-10)
Article
Open AccessDue to socio-economic and climatic changes around the world, large outdoor fires in the built environment have become one of the global issues that threaten billions of people. The devastating effects of them are indicative ... -
Aerodynamic study of MotoGP motorcycle flow redirectors
(2023-06-01)
Article
Open AccessIn recent years, the introduction of aerodynamic appendages and the study of their aero- dynamic performance in MotoGP motorcycles has increased exponentially. It was in 2016, with the introduction of the single electronic ... -
Thermodynamics-informed neural network for recovering supercritical fluid thermophysical information from turbulent velocity data
(Elsevier, 2023-11)
Article
Open AccessRecent research has highlighted the potential of supercritical fluids under high-pressure transcritical conditions to achieve microconfined turbulence as a result of the thermophysical properties they exhibit in the vicinity ... -
Assessment of fiber Bragg grating sensors for monitoring shaft vibrations of hydraulic turbines
(Multidisciplinary Digital Publishing Institute (MDPI), 2023-07-26)
Article
Open AccessThe structural dynamic response of hydraulic turbines needs to be continuously monitored to predict incipient failures and avoid catastrophic breakdowns. Current methods based on traditional off-board vibration sensors ... -
The thermodynamic limit of extractable kinetic energy buoyancy engine
(2023-08-25)
Article
Restricted access - publisher's policyIn this work, consideration is given to the thermodynamic limit of the kinetic energy extractable from the ascending or descending motion of a buoyancy engine for use in the contraction or expansion of its own chamber. ... -
Time-dependent 2-D model for transport of species analysis in electrodialysis: concentration profiles and fluxes
(2023-07-05)
Article
Restricted access - publisher's policyElectrodialysis (ED) is a separation process that uses an electric field to selectively transport ions through ion exchange membranes. To further advance the technology and bring it to an industrial scale, modeling ED and ... -
Flow control, active and passive applications
(Multidisciplinary Digital Publishing Institute, 2023-08-14)
Article
Open AccessThe Boundary Layer (BL) dynamic performance greatly affects the forces acting on any Bluff body. Ideally, the boundary layer should be attached to the surface but when separation occurs, the vortical structures and the ...
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