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David López      
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David López published an article in March 2019.
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Luis Garrote

103 shared publications

Department of Civil Engineering: Hydraulics, Energy and Environment, Universidad Politécnica de Madrid, 28040 Madrid, Spain

Tamara Ramos

2 shared publications

Hydraulic Laboratory of the Hydrographical Study Center, CEDEX, Ministry of Public Works and Transport, 28005 Madrid, Spain

Juan José Rebollo

1 shared publications

Hydraulic Laboratory of the Hydrographical Study Center, CEDEX, Ministry of Public Works and Transport, 28005 Madrid, Spain

Ricardo Herrero

1 shared publications

Hydraulic Laboratory of the Hydrographical Study Center, CEDEX, Ministry of Public Works and Transport, 28005 Madrid, Spain

Rubén Díaz

1 shared publications

Department of Infrastructures Planning, Ministry of Public Works and Transport, 28071 Madrid, Spain

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Article 0 Reads 0 Citations Experimental Analysis of the Influence of Aeration in the Energy Dissipation of Supercritical Channel Flows Juan José Rebollo, David López, Luis Garrote, Tamara Ramos, ... Published: 20 March 2019
Water, doi: 10.3390/w11030576
DOI See at publisher website ABS Show/hide abstract
Energy dissipation structures play an important role in flood risk management. Many variables need to be considered for the design of these structures. Aeration has been one of the more studied phenomena over the last years, due to its influence in the performance of hydraulic structures. The purpose of the work presented in this article is to experimentally characterize the effects of aeration on boundary friction in supercritical and fully turbulent flows. The physical model used to analyze the aeration effects consists of a spillway chute 6.5 m high and a stilling basin of 10 m length and 2 m high. A pump and compressor supply the water-air mixture and are controlled at the entrance by valves and flowmeters. The ensuing channel is monitored to determine the velocity profile and air concentration of the flow into the stilling basin. The average values of both variables and Manning’s coefficient along the channel are used to determine the relation between air concentration and energy dissipation by friction. A velocity increase with greater air entrainment has been found in all scenarios since friction is the main energy dissipation mechanism in open channels flow. Finally, an equation is proposed to characterize this evolution based on the results obtained.
Article 0 Reads 0 Citations Aplicación del método SPH al estudio hidráulico de estructuras. Análisis hidrodinámico del aliviadero en pozo de la pres... J.J. Rebollo, T. Ramos, F.R. Andrés, M.I. Berga, D. López, R... Published: 01 January 2016
Ribagua, doi: 10.1016/j.riba.2016.03.001
DOI See at publisher website ABS Show/hide abstract
ResumenSon muchos los trabajos de calibración realizados que avalan la validez del método de hidrodinámica suavizada de partículas (SPH) para el análisis de flujos turbulentos en lámina libre. Sin embargo, sus altos requerimientos computacionales no permitían su empleo en trabajos reales. El desarrollo de las técnicas de supercomputación en unidades de procesamiento gráfico (GPU) ha modificado esta situación y está permitiendo su utilización como herramienta de diseño.CEDEX ha desarrollado el modelo SPHERIMENTAL basado en esta tecnología con el fin de apoyar los experimentos realizados con modelación física. Esto ha permitido calibrar el modelo y emplearlo en el estudio de fenómenos complejos.Se presentan los trabajos realizados para la comprobación hidrodinámica de flujos en lámina libre del aliviadero en pozo de la presa de Nagore (Navarra), describiendo tanto los trabajos de calibración previos como los resultados obtenidos. AbstractMany calibration works have been performed to support the validity of the smoothed particle hydrodynamics (SPH) method for studying turbulent-free surface flows. However, its high computational requirements made it difficult to use in real cases. The development of techniques for supercomputing graphics processing units (GPU) has changed this situation, and is allowing its use as a design tool.CEDEX has developed a model based on this technology, SPHERIMENTAL, in order to support studies on physical modelling. This has enabled the model to be calibrated in order to study complex phenomena.This paper shows the works done to check the hydrodynamics free surface flows in the Nagore dam morning glory spillway, describing both the previous calibration works and the results obtained.
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