Browsing by Author "Blanco, J. M."
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Item Experimental analysis and numerical simulation of wave overtopping on a fixed vertical cylinder under regular waves(2022-04) Esteban, G. A.; Aristondo, A.; Izquierdo, U.; Blanco, J. M.; Pérez-Morán, G.; RENOVABLES OFFSHOREWave overtopping phenomenon affects relatively narrow offshore marine structures different from shoreline linear structures, where there is not defined a precise prediction methodology as it is the case of the behaviour at long coastal defences. In the present study a combined experimental and numerical approach has been followed to obtain an empirical relation that represents the relative overtopping discharge over a fixed vertical cylinder exposed to non-impulsive wave conditions. The phenomenon follows a Weibull type dependence on the relative freeboard in a similar way as the case of vertical walls but reporting a decreasing overtopping rate at higher freeboards. In addition, a direct linear relationship between the relative mean flow thickness computed at the centre of the circular crest of the cylinder and the relative overtopping discharge has been observed. This methodology may be used as an indirect cost-effective method to characterize experimentally the wave overtopping phenomenon in cylindrical structures of full-scale prototypes without the need of accumulating and characterising huge amounts of overtopped water volumes. The present study contains a systematic analysis of the dispersion obtained in the experimental and computational results to evaluate the performance attributed to the proposed empirical expressions.Item Magnetic and magnetostrictive behavior of amorphous and nanocrystalline (by current annealing) Fe86Zr7B6Cu1 alloy(1997-09) Zuberek, R.; Murillo, N.; González, J.; Blanco, J. M.; García-Tello, P.; Tecnalia Research & InnovationA reinforcement of the ferromagnetic character with applied tensile stress has been found in Fe86Zr7B6Cu1 amorphous alloy with a linear relationship between the change of the magnetization per unit stress. By annealing with electric current, an improvement of the magnetic softness of the alloy can be achieved in the range of current density of 50 to 75 Axmm-2. Such an effect is connected to the presence of ultrafine grains of dimensions typically of nanometers. Results of the magnetostriction constant are also report edfor the as-quenched and nanocrystalline alloy which are interpreted in terms of surface and bulk contributions from α-Fe grains.