2024-03-29T06:11:13Zhttps://www.tdx.cat/oai/requestoai:www.tdx.cat:10803/84952017-09-22T17:59:24Zcom_10803_311col_10803_317
TDX (Tesis Doctorals en Xarxa)
author
Usera Velasco, Gabriel
authoremail
gusera@fing.edu.uy
authoremailshow
true
director
Vernet Peña, Anton
codirector
Ferré i Vidal, Josep A.
2011-04-12T18:00:36Z
2009-12-17
2009-10-19
9788469279311
http://www.tdx.cat/TDX-1217109-095938http://hdl.handle.net/10803/8495
T-2061-2009
Esta tesis trata sobre algunos avances en técnicas para el análisis, la medición experimental y la simulación numérica de flujos confinados en geometrías complejas. Se han desarrollado e implementado algoritmos de interrogación para PIV de alta velocidad. Especial atención se ha puesto en el tratamiento de la interrogación cerca de las fronteras de la imagen. Para realizar las simulaciones numéricas se ha desarrollado un modelo para flujos 3D que trabaja con mallas curvilíneas estructuradas por bloques. Este modelo ha sido paralelizado utilizando OpenMP. La trilogía de técnicas se ha completado desarrollando una novedosa técnica de premediación condicional basada en fuzzy clustering. Esta técnica permite generar un conjunto de medias condicionadas y analizar a partir de ellas la evolución temporal del flujo. Las tres técnicas se han aplicado en forma integrada al estudio de un caso seleccionado, correspondiente al flujo dentro de un alojamiento de componentes electrónicos.<br/>Palabras clave: PIV, Volúmenes Finitos, Fuzzy Clustering, flujos confinados.
This thesis deals with the improvement of techniques for the detailed analysis, experimental measurement and numerical simulation of flows confined within complex geometry. Interrogation algorithms for time resolved PIV were designed and implemented. Special attention was given to the treatment of the near wall portions of the images to ensure appropriate resolution of the boundary layer by proper placement of the displacement vector when the interrogation area overlaps the image boundary. A 3D finite volume solver for the Navier Stokes equations was created. This numerical model works with block structured grids and sliding interfaces, allowing the treatment of rather complex geometries. This solver has been fully parallelised using OpenMP. The set of techniques was completed devising a novel conditional sampling method based on fuzzy clustering for the analysis of large scale dynamics in turbulent flows. A set of ensemble averages is produced and the time evolution of the flow can be analysed through the most probable sequence in time of the conditionally sampled averages. A case study was selected to drive the evolution of these techniques, concerning the flow inside a printed circuit board (PCB) enclosure. <br/>Keywords: PIV, Finite Volume, Fuzzy Clustering, confined flows
eng
complex geometry
finite volume
time resolved PIV
Fuzzy clustering
Improvements in full field techniques for the measurement, simulation and analysis of confined flows in complex geometry
info:eu-repo/semantics/doctoralThesis info:eu-repo/semantics/publishedVersion
URL
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