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• W2615837014 abstract "espanolSe estudia la dinamica del proceso de descarga subita de un liquido presurizado a la atmosfera, de amplio interes en Ingenieria de proteccion contra incendios. Se presenta el estado del arte en la literatura que trata dicho proceso de descarga. Se elabora un modelo hidraulico unidimensional para ese flujo, que adopta la forma de unas ecuaciones intregro-diferenciales ordinarias que se resuelven numericamente. Se efectua un analisis de sensibilidad respecto a todos los parametros de los que depende el modelo, con especial hincapie en la friccion generada por la turbulencia. Se analizan los metodos genericos de descripcion de la turbulencia, incluyendo la representacion estadistica, el filtrado de magnitudes turbulentas y la plena descripcion analitica. Se desarrolla una solucion analitica general para el flujo turbulento, incompresible y no estacionario en un tubo. Se elabora un modelo computacional tridimensional para el flujo descrito. La modelizacion de la turbulencia resulta ser el punto mas importante y conflictivo de dicho modelo. Se comparan los resultados obtenidos con los predichos por el modelo hidraulico unidimensional desarrollado previamente. Se presentan resultados respecto a la estructura interna de la turbulencia en flujos fuertemente acelerados, previendose un aumento notable de dicha turbulencia en las proximidades de la pared, que no se explica unicamente por el numero de Reynolds. EnglishThe dynamics involved in the process of sudden discharge of a pressurized liquid to the atmosphere is studied, a case of broad interest in fire protection Engineering. The state of the art in the literature regarding such discharge process is presented. A one-dimensional hydraulic model is developed for this flow, which takes the form of ordinary intregro-di ferential equations that are solved numerically. A sensitivity analysis is carried out with respect to all the parameters on which the model depends, with special emphasis on the friction generated by the turbulence. The generic methods of describing turbulence are analysed, including the statistical representation, the filtering of turbulent quantities and the full analytical description. A general analytical solution for the turbulent, incompressible and unsteady flow in a pipe is developed. A three-dimensional computational model for the described flow is elaborated. The modelling of turbulence turns out to be the most important and conflicting point of such model. The results obtained are compared with those predicted by the one-dimensional hydraulic model previously developed. Results are presented regarding the internal structure of the turbulence in strongly accelerated flows. A remarkable increase of said turbulence is anticipated in the proximities of the wall, that could not be explained only with the Reynolds number." @default.
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• W2615837014 date "2017-01-01" @default.
• W2615837014 modified "2023-09-26" @default.
• W2615837014 title "Transient discharge of a pressurised incompressible fluid through a pipe and analytical solution for unsteady turbulent pipe flow" @default.
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