Reloj de arena y amor en una poesía de Quevedo (fuentes italianas y derivaciones españolas).

Sin resume

Direct numerical simulation of multiphase flows with unstable interfaces

Published under licence in Journal of Physics: Conference Series by IOP Publishing Ltd. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.This paper presents a numerical model that intends to simulate efficiently the surface instability that arise in multiphase flows, typically liquid-gas, both for laminar or turbulent regimes. The model is developed on the in-house computing platform TermoFluids , and operates the finite-volume, direct numerical simulation (DNS) of multiphase flows by means of a conservative level-set method for the interface-capturing. The mesh size is optimized by means of an adaptive mesh refinement (AMR) strategy, that allows the dynamic re-concentration of the mesh in the vicinity of the interfaces between fluids, in order to correctly represent the diverse structures (as ligaments and droplets) that may rise from unstable phenomena. In addition, special attention is given to the discretization of the various terms of the momentum equations, to ensure stability of the flow and correct representation of turbulent vortices. As shown, the method is capable of truthfully simulate the interface phenomena as the Kelvin-Helmholtz instability and the Plateau-Rayleigh instability, both in the case of 2-D and 3-D configurations. Therefore it is suitable for the simulation of complex phenomena such as simulation of air-blast atomization, with several important application in the field of automotive and aerospace engines. A prove is given by our preliminary study of the 3-D coaxial liquid-gas jet.Peer ReviewedPostprint (published version

Numerical study of an impulse wave generated by a sliding mass

© 2018 WIT PressIn this work, a numerical framework for the direct numerical simulation of tsunami waves generated by landslide events is proposed. The method, implemented on the TermoFluids numerical platform, adopts a free surface model for the simulation of momentum equations; thus, considering the effect of air on the flow physics negligible. The effect of the solid motion on the flow is taken into account by means of a direct forcing immersed boundary method (IBM). The method is available for 3-D unstructured meshes; however, it can be integrated with an adaptive mesh refinement (AMR) tool to dynamically increase the local definition of the mesh in the vicinity of the interfaces, which separate the phases or in the presence of vortical structures. The method is firstly validated by simulating the entrance of objects into still water surfaces for 2-D and 3-D configurations. Next, the case of tsunami generation from a subaerial landslide is studied and the results are validated by comparison to experimental and numerical measurements. Overall, the model demonstrates its efficiency in the simulation of this type of physics, and a wide versatility in the choice of the domain discretization.Peer ReviewedPostprint (published version

Nuevos documentos para ilustrar la vida de Miguel de Cervantes Saavedra : con algunas observaciones y artículos sobre la vida y obras del mismo autor, y las pruebas de la autenticidad de su verdadero retrato

Copia digital. Valladolid : Junta de Castilla y León. Consejería de Cultura y Turismo, 2012-201

Numerical simulation of fluid structure interaction in free-surface flows: the WEC case

In this work we present a numerical framework to carry-out numerical simulations of fluid-structure interaction phenomena in free-surface flows. The framework employs a singlephase method to solve momentum equations and interface advection without solving the gas phase, an immersed boundary method (IBM) to represent the moving solid within the fluid matrix and a fluid structure interaction (FSI) algorithm to couple liquid and solid phases. The method is employed to study the case of a single point wave energy converter (WEC) device, studying its free decay and its response to progressive linear waves.E.Schillaci acknowledges the financial support of the Programa Torres Quevedo (PTQ2018- 010060). The work has also been supported by a competitive R+D project (PID2020-115837RBI00) of the Spanish Research Agency.Peer ReviewedPostprint (published version

Motor Stirling modificado

El objeto de este Trabajo Fin de Grado es la construcción de un prototipo de motor térmico de baja temperatura, de combustion externa. Para ello, y a partir del estudio del motor Stirling, se diseña un motor con una modificación sustancial del regenerador, sustituyéndolo por un desplazador rotativo para que pueda funcionar con bajas temperaturas de foco caliente. Una vez realizado el diseño, se fabrica, ajusta y pone en funcionamiento. A continuación se estudian las mejoras posibles, y se documenta y valora económicamente. Los resultados obtenidos se consideran como muy positivos, ya que el motor funciona con los parámetros inicialmente propuestos, si bien es obvio que necesita futuros desarrollos para mejorar su velocidad y rendimiento

Diseño de una matriz

En este proyecto se describe el proceso de diseño de una matriz progresiva para la fabricación en serie de una pieza de chapa de acero. Se realizará un estudio de dicha pieza y del proceso adecuado para fabricarla. El proceso de fabricación escogido será mediante una matriz progresiva, por lo que se estudiará la optimización de la banda de chapa, para obtener el mayor rendimiento, y las etapas de conformado de la chapa para obtener la pieza. Se hará el diseño de la matriz progresiva, tanto con elementos que se tengan que fabricar y necesiten sus respectivos planos, como con elementos normalizados. El diseño de la matriz estará justificado por los cálculos previos realizados

Automatización de una máquina industrial de llenado

Diseño de planos eléctricos y automátización de una máquina industrial de llenado de recipientes en función de la densidad del material con el que se desea llenar dicho recipiente

A numerical study of liquid atomization regimes by means of conservative level-set simulations

In this work, a conservative level-set finite-volume solver for interface-capturing is employed to perform the direct numerical simulation of Liquid Jets discharging into a quiescent air chamber. The scope is to propose a complete break-up regimes map entirely obtained from numerical simulations. The solver accounts for an adaptive mesh refinement strategy to optimize the computational resources. The numerical model is firstly validated in the context of 3D atomization by simulating the behavior of 3D Coaxial Liquid-Air Jets. Next, we propose an overview of the physical behavior of Liquid Jets, mainly proceeding from theoretical and experimental works. Hence, we perform a series of simulations aimed at studying the variability of the Liquid Jet characteristics as function of selected input parameters. In particular, the analyzed cases are characterized by variable values of Reynolds, Ohnesorge and Weber numbers. The patterns obtained in simulations are compared to the ones expected from bibliographic studies, situating each case on a break-up regime map. A general good agreement is found in the identification of the various break-up regimes and characteristic lengths, while the major differences have been highlighted and interpreted.Postprint (author's final draft

La Lluera I cave (San Juan de Priorio, Oviedo, Asturias, Spain): Solutrean stratigraphy

Presentamos los niveles básicos pertenecientes al Solutrense medio y final en la cueva de La Lluera I (Asturias, España), la cual ha estado sometida a un fuerte sistema de inundaciones y vaciados que han afectado a la estratigrafía antrópica de un modo muy importante y cuyo alcance, a veces, hizo que gran parte de los niveles desaparecieran, tanto los de ocupación humana como los de sedimentación natural, reduciéndolos al mínimo en unos casos o, en otros, mezclándolos en cierta medida. Debido a ello, la es-tratigrafía de la cueva de La Lluera I tiene que ser interpretada desde el punto de vista sedimentológico y del análisis morfológico del río Nalón a cuya actividad han de unirse, también, los efectos de las aguas de infiltración de la ladera en cuya parte inferior se localiza la cavidad y que desde una surgencia existente en su interior desaguan al Nalón arrastrando los materiales depositados en ella