Bugeda Castelltort, Gabriel
Total activity: 304
Professional category
University professor
Doctoral courses
Doctor Enginyer de Camins, Canals i Ports
University degree
Enginyer de Camins, Canals i Ports
Research group
(MC)2 - Group of Computational Mechanics on Continuous Medium
Department
Department of Strength of Materials and Structural Engineering
School
Escola Universitària d'Enginyeria Tècnica Industrial de Barcelona (EUETIB)
Associated research bodies
CIMNE. Centre Internacional de Mètodes Numèrics en Enginyeria Open in new window
E-mail
gabriel.bugedaupc.edu
Contact details
UPC directory Open in new window
Orcid
0000-0002-9320-8729 Open in new window
Scopus Author ID
6701388128 Open in new window

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1 to 50 of 304 results
  • Robust active shock control bump design optimisation using hybrid parallel MOGA

     Lee, Dong Seop; Bugeda Castelltort, Gabriel; Periaux, Jacques; Oñate Ibáñez de Navarra, Eugenio
    Computers and fluids
    Vol. 80, p. 214-224
    DOI: 10.1016/j.compfluid.2012.03.011
    Date of publication: 2013
    Journal article

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  • Multi-objective aerodynamic shape optimization using MOGA coupled to advanced adaptive mesh refinement

     Kouhi, Mohamed; Lee, Dong Seop; Bugeda Castelltort, Gabriel; Oñate Ibáñez de Navarra, Eugenio
    Computers and fluids
    Vol. 88, p. 298-312
    DOI: 10.1016/j.compfluid.2013.08.015
    Date of publication: 2013-12-15
    Journal article

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    This paper demonstrates the big influence of the control of the mesh quality in the final solution of aerodynamic shape optimization problems. It aims to study the trade-off between the mesh refinement during the optimization process and the improvement of the optimized solution. This subject is investigated in the transonic airfoil design optimization using an Adaptive Mesh Refinement (AMR) technique coupled to Multi-Objective Genetic Algorithm (MOGA) and an Euler aerodynamic analysis tool. The methodology is implemented to solve three practical design problems; the first test case considers a reconstruction design optimization that minimizes the pressure error between a predefined pressure curve and candidate pressure distribution. The second test considers the total drag minimization by designing airfoil shape operating at transonic speeds. For the final test case, a multi-objective design optimization is conducted to maximize both the lift to drag ratio (L/D) and lift coefficient (Cl). The solutions obtained with and without adaptive mesh refinement are compared in terms of solution improvement and computational cost. Numerical results clearly show that the use of adaptive mesh refinement can improve the solution accuracy while reducing significant computational cost in both single- and multi-objective design optimizations.

  • Docencia e investigación: ¿un falso dilema?

     Garcia-berro Montilla, Enrique; Amblàs, Gemma; Sallarés, Jordi; Bugeda Castelltort, Gabriel; Roca, Santiago
    Aula Abierta
    Vol. 41, num. 2, p. 13-22
    Date of publication: 2013-05-01
    Journal article

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    La Universidad Politécnica de Cataluña (UPC) dispone de un modelo de evaluación docente plenamente consolidado, que está adaptado a los requerimientos que emanan de la implantación del Espacio Europeo de Educación Superior. Dicho modelo de evaluación ha sido homologado por la Agència per a la Qualitat del Sistema Universitari de Catalunya (AQU Catalunya), la agencia de evaluación catalana y se basa en las directrices europeas más exigentes. Este modelo se ha empleado para evaluar la docencia del profesorado en seis convocatorias, por lo que se dispone de una información exhaustiva, tanto a nivel agregado como separado por colectivos y ámbitos de conocimiento. Por otro lado, también se dispone de información sobre la actividad investigadora del profesorado, medida mediante el número de sexenios obtenidos. En este artículo se presentan estos datos y se estudia si existe una correlación positiva entre la calidad de la docencia impartida y el reconocimiento de las tareas investigadoras de los profesores, medida a través del número de sexenios obtenidos. Nuestros resultados indican que tal correlación existe, aunque es más débil de lo que cabría esperar.

  • Robust design optimisation of advance hybrid (fiber¿metal) composite structures

     Lee, Dong Seop; Morillo Carbonell, Carlos; Oller Martinez, Sergio Horacio; Bugeda Castelltort, Gabriel; Oñate Ibáñez de Navarra, Eugenio
    Composite structures
    Vol. 99, p. 181-192
    DOI: 10.1016/j.compstruct.2012.11.033
    Date of publication: 2013-05
    Journal article

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  • A Contribution to the Finite Element Analysis of High-Speed Compressible Flows and Aerodynamics Shape Optimization  Open access

     Kouhi Esfahani, Mohammad
    Universitat Politècnica de Catalunya
    Theses

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    El presente trabajo pretende contribuir a dos de los campos de investigación más interesantes en la aerodinámica, el análisis numérico de flujos compresibles a alta velocidad (Parte I) y la optimización de la forma aerodinámica (Parte II).La primera parte de este estudio se centra en la solución numérica de las ecuaciones de Navier-Stokes, que modelan el comportamiento de flujos compresibles a alta velocidad. La discretización espacial se lleva a cabo mediante el método de elementos finitos (FEM) y se pone especial énfasis en el desarrollo de una nueva formulación estabilizada basada en la técnica de cálculo de Incremento finitos (FIC). En este última, los términos de estabilización convectiva se obtienen de manera natural de las ecuaciones de gobierno a través de postulados de conservación y equilibrio de flujos en un dominio espacio-tiempo de tamaño finito. Ello lleva a la obtención de dos términos de estabilización que funcionan de manera complementaria. Uno actúa en dirección de las líneas de corriente proporcionando la estabilización necesaria para contrarestrar las inestabilidades propias de la forma discreta de Galerkin y el otro término, de tipo shock capturing, actúa de manera transversal a las líneas de corriente y permite mejorar la solución numérica alrededor de discontinuidades y otro tipos de fenómenos localizados en el campo de solución de problema. La forma discreta de las ecuaciones de gobierno se completa mediante un esquema de integración temporal explícito de tipo de Runge-Kutta de 4to orden. El esquema de solución básico propuesto se complementa con una técnica de refinamiento adaptativo de malla que permite mejorar automáticamente la solución numérica en zonas localizadas del dominio en que, dadas las características del flujo, se necesita una mayor resolución espacial.Con el propósito de investigar el comportamiento de la formulación numérica se estudian diferentes casos de análisis que implican flujos viscosos y no viscosos en régimen subsónico, transónico y supersónico y se estudia con especial detalle el funcionamiento de la técnica de estabilización propuesta. Los resultados obtenidos demuestran una exactitud satisfactoria y una buena correlación con resultados presentes en la literatura, incluso cuando se trabaja con discretizaciones espaciales relativamente gruesas. Adicionalmente, los estudios numéricos realizados demuestran que el empleo del esquema adaptativo de malla es eficaz para incrementar la exactitud de la solución numérica manteniendo un bajo coste computacional.En la segunda parte de este estudio se propone un método para la optimización de formas aerodinámicas que combina algoritmos genéticos multi-objetivo (MOGAs) y remallado adaptativo con el objetivo de asegurar, con un coste computacional mínimo, la calidad de la solución numérica empleada en el proceso de búsqueda de un determinado diseño objetivo, particularmente cuando el flujo presenta discontinuidades y gradientes muy localizados, típicos de flujos a alta velocidad. La metodología se aplica a resolver tres problemas prácticos de diseño de perfiles aerodinámicos en flujo transónico que implican la optimización de la distribución de presiones, minimización de la resistencia de onda y maximización conjunta de la sustentación y la relación sustentación/resistencia. Para cada uno de ellos se estudia el efecto del refinamiento en la calidad de la solución numérica así como también en el coste computacional y la convergencia del problema. Los estudios realizados demuestran la eficacia de la metodología propuesta.

    This work covers a contribution to two most interesting research elds in aerodynamics, the fi nite element analysis of high-speed compressible flows (Part I) and aerodynamic shape optimization (Part II). The fi rst part of this study aims at the development of a new stabilization formulation based on the Finite Increment Calculus (FIC) scheme for the Euler and Navier-Stokes equations in the context of the Galerkin nite element method (FEM). The FIC method is based on expressing the balance of fluxes in a spacetime domain of nite size. It is tried to prevent the creation of instabilities normally presented in the numerical solutions due to the high convective term and sharp gradients. In order to overcome the typical instabilities happening in the numerical solution of the high-speed compressible flows, two stabilization terms, called streamline term and transverse term, are added through the FIC formulation in space-time domain to the original conservative equations of mass, momentum and energy. Generally, the streamline term holding the direction of the velocity is responsible for stabilizing the spurious solutions produced from the convective term while the transverse term smooths the solution in the high gradient zones. An explicit fourth order Runge-Kutta scheme is implemented to advance the solution in time. In order to investigate the capability of the proposed formulation, some numerical test examples corresponding to subsonic, transonic and supersonic regimes for inviscid and viscous flows are presented. The behavior of the proposed stabilization technique in providing appropriate solutions has been studied especially near the zones where the solution has some complexities such as shock waves, boundary layer, stagnation point, etc. Although the derived methodology delivers precise results with a nearly coarse mesh, the mesh refinement technique is coupled in the solution to create a suitable mesh particularly in the high gradient zones. The comparison of the numerical results obtained from the FIC formulation with the reference ones demonstrates the robustness of the proposed method for stabilization of the Euler and Navier-Stokes equations. It is observed that the usual oscillations occur in the Galerkin FEM, especially near the high gradient zones, are cured by implementing the proposed stabilization terms. Furthermore, allowing the adaptation framework to modify the mesh, the quality of the results improves signi cantly. The second part of this thesis proposes a procedure for aerodynamic shape optimization combining Genetic Algorithm (GA) and mesh re nement technique. In particular, it is investigated the e ect of mesh re nement on the computational cost and solution accuracy during the process of aerodynamic shape optimization. Therefore, an adaptive remeshing technique is joined to the CFD solver for the analysis of each design candidate to guarantee the production of more realistic solutions during the optimum design process in the presence of shock waves. In this study, some practical transonic airfoil design problems using adap- tive mesh techniques coupled to Multi-Objective Genetic Algorithms (MOGAs) and Euler flow analyzer are addressed. The methodology is implemented to solve three practical design problems; the fi rst test case considers a reconstruction design optimization that minimizes the pressure error between a prede ned pressure curve and candidate pressure distribution. The second test considers the total drag minimization by designing airfoil shape operating at transonic speeds. For the final test case, a multi-objective design optimization is conducted to maximize both the lift to drag ratio (L/D) and lift coe cient (Cl). The solutions obtained with and without adaptive mesh re nement are compared in terms of solution accuracy and computational cost. These design problems under transonic speeds need to be solved with a ne mesh, particularly near the object, to capture the shock waves that will cost high computational time and require solution accuracy. By comparison of the the numerical results obtained with both optimization problems, the obtainment of direct bene ts in the reduction of the total computational cost through a better convergence to the final solution is evaluated. Indeed, the improvement of the solution quality when an adaptive remeshing technique is coupled with the optimum design strategy can be judged.

    El presente trabajo pretende contribuir a dos de los campos de investigaci on m as interesantes en la aerodin amica, el an alisis num erico de flujos compresibles a alta velocidad (Parte I) y la optimizaci on de la forma aerodin amica (Parte II). La primera parte de este estudio se centra en la soluci on num erica de las ecuaciones de Navier-Stokes, que modelan el comportamiento de flujos compresibles a alta velocidad. La discretizaci on espacial se lleva a cabo mediante el m etodo de elementos nitos (FEM) y se pone especial enfasis en el desarrollo de una nueva formulaci on estabilizada basada en la t ecnica de c alculo de Incremento fi nitos (FIC). En este ultima, los t erminos de estabilizaci on convectiva se obtienen de manera natural de las ecuaciones de gobierno a trav es de postulados de conservaci on y equilibrio de flujos en un dominio espacio-tiempo de tamaño nito. Ello lleva a la obtenci on de dos t erminos de estabilizaci on que funcionan de manera complementaria. Uno act ua en direcci on de las lineas de corriente proporcionando la estabilizaci on necesaria para contrarestrar las inestabilidades propias de la forma discreta de Galerkin y el otro t ermino, de tipo shock capturing, act ua de manera transversal a las l neas de corriente y permite mejorar la soluci on num erica alrededor de discontinuidades y otro tipos de fen omenos localizados en el campo de soluci on de problema. La forma discreta de las ecuaciones de gobierno se completa mediante un esquema de integraci on temporal expl icito de tipo de Runge-Kutta de 4to orden. El esquema de soluci on b asico propuesto se complementa con una t ecnica de re namiento adaptativo de malla que permite mejorar autom aticamente la soluci on num erica en zonas localizadas del dominio en que, dadas las caracter sticas del flujo, se necesita una mayor resoluci on espacial. Con el prop osito de investigar el comportamiento de la formulaci on num erica se estudian diferentes casos de an alisis que implican flujos viscosos y no viscosos en r egimen subs onico, trans onico y supers onico y se estudia con especial detalle el funcionamiento de la t ecnica de estabilizaci on propuesta. Los resultados obtenidos demuestran una exactitud satisfactoria y una buena correlaci on con resultados presentes en la literatura, incluso cuando se trabaja con discretizaciones espaciales relativamente gruesas. Adicionalmente, los estudios num ericos realizados demuestran que el empleo del esquema adaptativo de malla es e ficaz para incrementar la exactitud de la soluci on numerica manteniendo un bajo coste computacional. En la segunda parte de este estudio se propone un m etodo para la optimizaci on de formas aerodin amicas que combina algoritmos gen eticos multiobjetivo (MOGAs) y remallado adaptativo con el objetivo de asegurar, con un coste computacional m nimo, la calidad de la soluci on numerica empleada en el proceso de b usqueda de un determinado diseño objetivo, particularmente cuando el flujo presenta discontinuidades y gradientes muy localizados, ti picos de flujos a alta velocidad. La metodolog a se aplica a resolver tres problemas pr acticos de diseño de per les aerodin amicos en flujo trans onico que implican la optimizaci on de la distribuci on de presiones, minimizaci on de la resistencia de onda y maximizaci on conjunta de la sustentaci on y la relaci on sustentaci on/resistencia. Para cada uno de ellos se estudia el efecto del re namiento en la calidad de la soluci on num erica as como tambi en en el coste computacional y la convergencia del problema. Los estudios realizados demuestran la e cacia de la metodolog a propuesta.

  • A Constitutive Model of Human Esophagus Tissue with Application for the Treatment of Stenosis  Open access

     Sanchez Molina, David
    Universitat Politècnica de Catalunya
    Theses

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    Esta tesis es una investigación sobre el comportamiento mecánico del esófago humano. Este trabajo se pensó para ser aplicado al tratamiento de la estenosis y otras afecciones esofágicas que, con frecuencia, requieren dilatación forzada, lo que supone altas presiones sobre la pared esofágica. Este estudio propone un modelo constitutivo para simular estas dilataciones forzadas. Este estudio incluye la caracterización experimental del comportamiento mecánico del esófago. Además, se han planteado algunas cuestiones teóricas y experimentales que han sido resueltas.Esta tesis resume el trabajo previo sobre tejido esofágico de otros investigadores. Además, se da una pequeña explicación sobre la teoría del medio microntinuo desarrollada en las últimas décadas y un breve resumen de la teoría general de modelos constitutivos hiperelásticos no-lineales (con grandes deformaciones). El estudio requirió experimentación de tejido para caracterizar el comportamiento in vitro. Los test incluyeron test de tracción y test de inflado. Se empleó rastreo óptico para un cálculo adecuado de la deformación. Los resultados de los test permitieron encontrar las propiedades mecánicas según dos modelos de esófago de la literatura. El análisis de los datos rebeló, algunas correlaciones significativas entre factores como el índice de masa corporal y algunas propiedades mecánicas. Los valores típicos de las propiedades fueron usados para algunas simulaciones numéricas basadas en los modelos propuestos. Además se han obtenido algunos resultados teóricos sobre la tensión residual y las predicciones de la mecánica estadística para un sistema de fibras de colágeno del tejido.El principal resultado es un modelo constitutivo de microestiramiento anisótropo no-lineal e hiperelástico para caracterizar el esófago. Este modelo es adecuado para la computación numérica.

    This dissertation is a research about the mechanical behavior of the human esophagus. This work is intended to be applied in the treatment of stenosis and other esophageal diseases that frequently require a procedure of forced dilation, that involves high pressures on the esophagus wall. This study proposes a constitutive model to simulate forced dilatations. This study includes the experimental characterization of the mechanical behavior of human esophagus. In addition, some theoretical questions and experimental issues were addressed and solved. This dissertation summarizes the previous work on esophageal tissues by other authors. Additionally, a short explanation about the microcontinuum theory developed in the last decades is given, as well as a summary of the general theory of nonlinear hyperelastic constitutive models (with large deformation). This study required extensive testing of esophageal tissue in order to characterize the in vitro mechanical behavior. The testing included mainly tensile tests and complementary inflation tests. Optical motion track analysis was used for accurate computation of the strains in the tissue. The results of the tests were used for adjusting the mechanical properties that characterize the mechanical behavior of esophagus in the proposed models of the literature. The statistical analysis of the data revealed, some significant correlations between anthropometric factors, such as the body mass index, and some mechanical properties were found in the analysis of the data. The typical values of the mechanical properties were used to perform some numerical finite element simulations based on the proposed models. In addition, a number of theoretical results were obtained concerning the residual stress and the predictions of statistical mechanics for a system of collagenous fibers inside a soft tissue. The main result is a constitutive non-linear microstretch anisotropic hyperelastic constitutive model with large deformations (and with residual stresses) to characterize the multi-layered tissue of human esophagus. This model is suitable for numerical simulation.

    Esta tesis es una investigación sobre el comportamiento mecánico del esófago humano. Este trabajo se pensó para ser aplicado al tratamiento de la estenosis y otras afecciones esofágicas que, con frecuencia, requieren dilatación forzada, lo que supone altas presiones sobre la pared esofágica. Este estudio propone un modelo constitutivo para simular estas dilataciones forzadas. Este estudio incluye la caracterización experimental del comportamiento mecánico del esófago. Además, se han planteado algunas cuestiones teóricas y experimentales que han sido resueltas. Esta tesis resume el trabajo previo sobre tejido esofágico de otros investigadores. Además, se da una pequeña explicación sobre la teoría del medio microntinuo desarrollada en las últimas décadas y un breve resumen de la teoría general de modelos constitutivos hiperelásticos no-lineales (con grandes deformaciones). El estudio requirió experimentación de tejido para caracterizar el comportamiento in vitro. Los test incluyeron test de tracción y test de inflado. Se empleó rastreo óptico para un cálculo adecuado de la deformación. Los resultados de los test permitieron encontrar las propiedades mecánicas según dos modelos de esófago de la literatura. El análisis de los datos rebeló, algunas correlaciones significativas entre factores como el índice de masa corporal y algunas propiedades mecánicas. Los valores típicos de las propiedades fueron usados para algunas simulaciones numéricas basadas en los modelos propuestos. Además se han obtenido algunos resultados teóricos sobre la tensión residual y las predicciones de la mecánica estadística para un sistema de fibras de colágeno del tejido. El principal resultado es un modelo constitutivo de microestiramiento anisótropo no-lineal e hiperelástico para caracterizar el esófago Este modelo es adecuado para la computación numérica.

  • Diseño óptimo multi-objetivo y ecológico de materiales con estructuras compuestas con nanotubos de carbono

     Morillo, Carlos; Lee, Dong Seop; Bugeda Castelltort, Gabriel; Oller Martinez, Sergio Horacio; Oñate Ibáñez de Navarra, Eugenio
    Congreso de Métodos Numéricos en Ingeniería
    p. 1695
    Presentation's date: 2013-06-26
    Presentation of work at congresses

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  • Multi-objective green design optimization of carbon nanotube composite structures

     Morillo, Carlos; Lee, Dong Seop; Bugeda Castelltort, Gabriel; Oller Martinez, Sergio Horacio; Oñate Ibáñez de Navarra, Eugenio
    International Conference on Computational Methods for Coupled Problems in Science and Engineering
    p. 1
    Presentation's date: 2013-06-19
    Presentation of work at congresses

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  • Design optimisation of morphing UAV aerofoil/wing using computational intelligence system coupled game strategies

     Lee, Dong Seop; Periaux, Jacques; Bugeda Castelltort, Gabriel; Oñate Ibáñez de Navarra, Eugenio
    European Congress on Computational Methods in Applied Sciences and Engineering
    Presentation's date: 2013-09-10
    Presentation of work at congresses

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  • Greener Europe-China networking in aeronautics through projects GRAIN and GRAIN2

     Bugeda Castelltort, Gabriel
    Association International Workshop on AeroStructures
    p. 1
    Presentation's date: 2013-10-11
    Presentation of work at congresses

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  • On the need for the use of error-controlled finite element analyses in structural shape optimization processes with evolutionary algorithms

     Ródenas García, Juan José; Bugeda Castelltort, Gabriel; Albelda, José; Oñate Ibáñez de Navarra, Eugenio; Nadal, E.
    Revista internacional de métodos numéricos para cálculo y diseño en ingeniería
    Vol. 28, num. 1, p. 1-11
    DOI: 10.1016/j.rimni.2011.11.005
    Date of publication: 2012-01
    Journal article

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  • Multilayered composite structure design optimisation using distributed/parallel multi-objective evolutionary algorithms

     Lee, Dong Seop; Morillo Carbonell, Carlos; Bugeda Castelltort, Gabriel; Oller Martinez, Sergio Horacio; Oñate Ibáñez de Navarra, Eugenio
    Composite structures
    Vol. 94, num. 3, p. 1087-1096
    DOI: 10.1016/j.compstruct.2011.10.009
    Date of publication: 2012-02
    Journal article

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    Un caso práctico de meta-evaluación docente: el manual de evaluación de la Universidad Politécnica de Cataluña  Open access

     Garcia-berro Montilla, Enrique; de la Vega, Ricardo; Gemma, Amblàs; Martínez, Erica; Campeny, Laura; Bugeda Castelltort, Gabriel; Roca, Santiago
    Aula Abierta
    Vol. 40, num. 2, p. 11-24
    Date of publication: 2012-05-15
    Journal article

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    La Universidad Politécnica de Cataluña ha sido pionera en la introducción de un modelo de eva- luación docente plenamente adaptado a las exigencias del Espacio Europeo de Enseñanza Supe- rior. Además, su sistema de evaluación de la actividad docente del profesorado ha sido homologa- do por la AQU y ANECA. Dicho modelo de evaluación docente se basa en las más recientes di- rectrices europeas y tiene como fundamento diversos indicadores indirectos. Este modelo se ha em- pleado para evaluar la docencia del profesorado en cinco convocatorias. Durante este periodo de tiempo se ha acumulado una información valiosísima que permite obtener datos agregados no só- lo de la calidad de los docentes sino, también, de diversas características inherentes al proceso de evaluación, así como de la bondad de los indicadores empleados. En este artículo se presentan es- tos datos y se muestra un conjunto de datos agregados que permiten estimar la bondad y fiabilidad del proceso de evaluación, así como su aceptación por el profesorado evaluado.

  • Optimización robusta en aplicaciones aeronáuticas con la combinación de cálculo estocástico y algoritmos evolutivos

     Pons Prats, Jordi; Bugeda Castelltort, Gabriel; Zarate Araiza, Jose Francisco; Oñate Ibáñez de Navarra, Eugenio
    Revista internacional de métodos numéricos para cálculo y diseño en ingeniería
    Vol. 28, num. 1, p. 18-32
    DOI: 10.1016/j.rimni.2011.11.001
    Date of publication: 2012
    Journal article

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  • Advanced hybrid composite structure design optimisation using robust multi-objective optimisation platform (RMOP)

     Lee, Dong Seop; Morillo Carbonell, Carlos; Oller Martinez, Sergio Horacio; Bugeda Castelltort, Gabriel; Oñate Ibáñez de Navarra, Eugenio
    International Conference on Mechanics of Nano, Micro and Macro Composite Structures
    p. 1-2
    Presentation's date: 2012-06
    Presentation of work at congresses

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  • Multi-objective design optimization of morphing UAV aerofoil/wing using hybridised MOGA

     Lee, Dong Seop; Gonzalez, Luis Felipe; Periaux, Jacques; Bugeda Castelltort, Gabriel
    IEEE Congress on Evolutionary Computation
    p. 1-8
    DOI: 10.1109/CEC.2012.6256429
    Presentation's date: 2012
    Presentation of work at congresses

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    The paper investigates two advanced Computational Intelligence Systems (CIS) for a morphing Unmanned Aerial Vehicle(UAV) aerofoil/wing shape design optimisation. The first CIS uses Genetic Algorithm (GA) and the second CIS uses Hybridized GA (HGA) with the concept of Nash-Equilibrium to speed up the optimisation process. During the optimisation, Nash-Game will act as a pre-conditioner. Both CISs; GA and HGA, are based on Pareto optimality and they are coupled to Euler based Computational Fluid Dynamic (CFD) analyser and one type of Computer Aided Design(CAD) system during the optimisation.

  • Low environmental impact composite structure design optimisation using robust multi-objective optimisation platform

     Morillo Carbonell, Carlos; Lee, Dong Seop; Bugeda Castelltort, Gabriel; Oller Martinez, Sergio Horacio; Oñate Ibáñez de Navarra, Eugenio
    International Conference on Mechanics of Nano, Micro and Macro Composite Structures
    p. 1-2
    Presentation's date: 2012-06
    Presentation of work at congresses

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  • Computational intelligence system for single and multi-objective design problems in aeronautics

     Lee, Dong Seop; Periaux, Jacques; Bugeda Castelltort, Gabriel; Oñate Ibáñez de Navarra, Eugenio
    World Congress on Computational Mechanics
    Presentation's date: 2012
    Presentation of work at congresses

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  • Multi-objective S-rail design optimisation using robust multi-objective optimisation platform

     Lee, Dong Seop; Periaux, Jacques; Bugeda Castelltort, Gabriel; Oñate Ibáñez de Navarra, Eugenio
    World Congress on Computational Mechanics
    Presentation's date: 2012
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  • On the need for the use of error-controlled finite element analyses in structural shape optimization processes

     Ródenas García, Juan José; Bugeda Castelltort, Gabriel; Albelda, José; Oñate Ibáñez de Navarra, Eugenio
    International journal for numerical methods in engineering
    Vol. 87, num. 11, p. 1105-1126
    DOI: 10.1002/nme.3155
    Date of publication: 2011
    Journal article

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  • Robust design optimization in aeronautics using stochastic analysis and evolutionary algorithms

     Pons Prats, Jordi; Bugeda Castelltort, Gabriel; Zarate Araiza, Jose Francisco; Oñate Ibáñez de Navarra, Eugenio
    Proceedings of the Institution of Mechanical Engineers. Part G, journal of aerospace engineering
    Vol. 225, num. 10, p. 1131-1151
    DOI: 10.1177/0954410011412131
    Date of publication: 2011-10
    Journal article

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  • Double-shock control bump design optimization using hybridized evolutionary algorithms

     Lee, Dong Seop; Gonzalez, Luis Felipe; Periaux, Jacques; Bugeda Castelltort, Gabriel
    Proceedings of the Institution of Mechanical Engineers. Part G, journal of aerospace engineering
    Vol. 225, num. 10, p. 1175-1192
    DOI: 10.1177/0954410011406210
    Date of publication: 2011-10
    Journal article

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  • Multilayered composite structure design optimisation using a robust multi-objective optimisation platform

     Bugeda Castelltort, Gabriel; Oller Martinez, Sergio Horacio; Fruitos Bickham, Oscar Alejandro; Morillo Carbonell, Carlos; Lee, Dong Seop
    International Conference on Composite Structures
    p. 1-2
    Presentation's date: 2011-06-30
    Presentation of work at congresses

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  • La evaluación de la actividad docente del profesorado en el marco del EEES

     Garcia-berro Montilla, Enrique; Roca Martín, Santiago; Amblàs Marondo, Gemma; Murcia Rodriguez, Francisco; Pallarés González Novelles, Jordi; Bugeda Castelltort, Gabriel
    Aula Abierta
    Vol. 38, num. 2, p. 29-39
    Date of publication: 2010-07
    Journal article

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    En este artículo se describe el sistema de evaluación de la actividad docente del profesorado de la Universidad Politécnica de Cataluña (UPC). Dicho sistema de evaluación está homologado por la Agencia para la Calidad de Sistema Universitario de Cataluña (AQU) y por la Agencia Nacional de Evaluación y Acreditación (ANECA). El diseño de este sistema de evaluación se ha hecho en consonancia con las directrices europeas y teniendo en cuenta los retos de la implantación de las nuevas titulaciones de arquitectura e ingeniería adaptadas al Espacio Europeo de Enseñanza Superior (EEES). De acuerdo con estos planteamientos, en este trabajo se expone el proceso que ha conducido a su implantación, partiendo de un análisis del contexto general de la universidad española y de la UPC en particular, se describen de forma razonada las hipótesis de partida de nuestro modelo, se explican detalladamente los indicadores de calidad y se hace énfasis en la implementación práctica del modelo. Asimismo se hace un análisis crítico de todo el sistema, obtenido a partir de los comentarios de la comisión de acreditación, del informe de auto-evaluación y de las opiniones vertidas por el profesorado que ha sometido a evaluación su actividad docente.

  • Access to the full text
    Lift maximization with uncertainties for the optimization of high-lift devices  Open access

     Zhili, Tang; Periaux, Jacques; Bugeda Castelltort, Gabriel; Oñate Ibáñez de Navarra, Eugenio
    International journal for numerical methods in fluids
    Vol. 64, num. 2, p. 119-135
    Date of publication: 2010-09-20
    Journal article

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    In this paper, the aerodynamic shape optimization problems with uncertain operating conditions have been addressed. After a review of robust control theory and the possible approaches to take into account uncertainties, the use of Taguchi robust design methods in order to overcome single point design problems in aerodynamics is proposed. Under the Taguchi concept, a design with uncertainties is converted into an optimization problem with two objectives which are the mean performance and its variance, so that the solutions are as less sensitive to the uncertainty of the input parameters as possible. Furthermore, the modified non-dominated sorting genetic algorithms are used to capture a set of compromised solutions (Pareto front) between these two objectives. The flow field is analyzed by Navier–Stokes computation using an unstructured mesh. In order to reduce the number of expensive evaluations of the fitness function a response surface modeling is employed to estimate the fitness value using the polynomial approximation model. During the solution of the optimization problem, a semi-torsional spring analogy is used for the adaption of the computational mesh to all the obtained geometrical configurations. The proposed approach is applied to the robust optimization of the 2D high-lift devices of a business aircraft by maximizing the mean and minimizing the variance of the lift coefficients with uncertain free-stream angle of attack at landing flight condition. Copyright q 2009 John Wiley & Sons, Ltd.

  • El método de los elementos finitos : volumen 1 : las bases

     Zienkiewicz, Olgierd Cecil; TAYLOR, R.L.; Zhu, J. Z.
    Date of publication: 2010-01-29
    Book

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  • Analysis of an Aero-Elastic 2D Profile Under Uncertainty Conditions

     Bugeda Castelltort, Gabriel; Oñate Ibáñez de Navarra, Eugenio; Pons Prats, Jordi
    World Congress on Computational Mechanics
    p. 77
    Presentation's date: 2010-07-21
    Presentation of work at congresses

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  • El método de los elementos finitos : volumen 3 : dinámica de fluidos

     Zienkiewicz, Olgierd Cecil; TAYLOR, R.L.; Nithiarasu, Perumal
    Date of publication: 2010-01-29
    Book

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  • El método de los elementos finitos : volumen 2 : mecánica de sólidos

     Zienkiewicz, Olgierd Cecil; TAYLOR, R.L.
    Date of publication: 2010-01-29
    Book

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    Aerodynamic shape optimization using adaptive remeshing  Open access

     Kouhi, Mohammad; Bugeda Castelltort, Gabriel; Lee, Dong Seop; Oñate Ibáñez de Navarra, Eugenio
    International Conference on Engineering Optimization
    p. 1-10
    Presentation's date: 2010-09-07
    Presentation of work at congresses

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    Adaptive mesh refinement is one of the most important tools in Computational Fluid Dynamics (CFD) for solving complex engineering design problems. The paper investigates two practical transonic aerofoil design optimization problems using a genetic algorithm coupled with an Euler aerodynamic analysis tool. The first problem consists in the minimization of transonic drag whereas the second is a reconstruction transonic problem solved by minimizing the pressure error. In both cases, the solutions obtained with and without adaptive mesh refinement are compared. Numerical results obtained by both drag minimization and reconstruction design clearly show that the use of adaptive mesh refinement reduces the computational cost and also produces a better solution.

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    Double Shock Control Bump Design Optimization Using Hybridised Evolutionary Algorithms  Open access

     Lee, Dong Seop; Periaux, Jacques; Pons-Prats, Jordi; Bugeda Castelltort, Gabriel; Oñate Ibáñez de Navarra, Eugenio
    International Conference on Complex Medical Engineering
    p. 1-8
    Presentation's date: 2010-07-22
    Presentation of work at congresses

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    The paper investigates two advanced optimisation methods for solving active flow control device shape design problem and also compares their optimisation efficiency in terms of computational cost and design quality. The first optimisation method uses Hierarchical Asynchronous Parallel Multi-Objective Evolutionary Algorithm (HAPMOEA) and the second uses Hybridized EA with Nash-Game strategies. Both optimisation method are based on a canonical evolution strategy and incorporates the concepts of parallel computing and asynchronous evaluation. For the practical test case, one of active flow control devices named Shock Control Bump (SCB) is considered and it is applied to Natural Laminar Flow (NLF) aerofoil. The concept of SCB is to decelerate supersonic flow on upper/lower surface of transonic aerofoil that leads delay of shock occurrence. Such active flow technique reduces a total drag at transonic speeds. Numerical results clearly show that Hybrid-Game helps EA to accelerate optimisation process, and also applying SCB on the suction and pressure sides significantly reduces transonic wave drag and improves lift on drag (L/D) value when compared to the baseline design.

  • Estrategias e indicadores para la evaluación de la docencia en el marco del EEES

     Garcia-berro Montilla, Enrique; Dapia de Dios, Francesc; Amblas Marondo, Gemma; Bugeda Castelltort, Gabriel; Roca Martín, Santiago
    Revista de investigación en educación
    Vol. 6, p. 142-152
    Date of publication: 2009
    Journal article

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    Control of the finite element discretization error during the convergence of structural shape optimization algorithms  Open access

     Bugeda Castelltort, Gabriel; Ródenas García, Juan José; Albelda, José; Oñate Ibáñez de Navarra, Eugenio
    International journal for simulation and multidisciplinary design optimization
    Vol. 3, num. 3, p. 363-369
    DOI: 10.1051/ijsmdo/2009012
    Date of publication: 2009-07-01
    Journal article

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    This work analyzes the influence of the discretization error contained in the Finite Element (FE) analyses of each design configuration proposed by structural shape optimization algorithms over the behaviour of the algorithm. If the FE analyses are not accurate enough, the final solution will neither be optimal nor satisfy the constraints. The need for the use of adaptive FE analysis techniques in shape optimum design will be shown. The paper also proposes the use of the algorithm described in [1] in order to reduce the computational cost associated to the adaptive FE analysis of each geometrical configuration when evolutive optimization algorithms are used.

  • -

     Bugeda Castelltort, Gabriel; Periaux, Jacques; Hirsch, C; Höld, R; Courty, J -C; Marenghi, Y; Marini, M; Papailiou, K; Schwamborn, D
    Date of publication: 2009-03
    Book chapter

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  • DESARROLLO DE HERRAMIENTAS PARA EL DISEÑO ROBUSTO DE COMPONENTES AERONÁUTICOS

     Perez Gracia, Maria de La Vega; Sanchez Molina, David; Velazquez Ameijide, Juan; Bugeda Castelltort, Gabriel
    Competitive project

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  • GRUP DE RESISTÈNCIA DE MATERIALS I ESTRUCTURES A L'ENGINYERIA

     Hernandez Ortega, Joaquin Alberto; Cervera Ruiz, Miguel; Davalos Chargoy, Cesar Emilio; Chiumenti, Michele; Baiges Aznar, Joan; Cante Teran, Juan Carlos; Bugeda Castelltort, Gabriel; Barbat Barbat, Horia Alejandro; Codina Rovira, Ramon; Weyler Perez, Rafael; Suarez Arroyo, Benjamin; Miquel Canet, Juan; González Lopez, Jose Manuel; Badia Rodriguez, Santiago I.; Agelet de Saracibar Bosch, Carlos; Oller Martinez, Sergio Horacio; Pelà, Luca; Oliver Olivella, Fco. Javier
    Competitive project

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  • Lift Maximization with Uncertainties for the Optimization of High Lift Devices Using Multi Criterion Evolutionary Algorithms

     Bugeda Castelltort, Gabriel
    IEEE Congress on Evolutionary Computation
    Presentation's date: 2009-05-21
    Presentation of work at congresses

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    Robust shape optimization in aeronautics  Open access

     Pons-Prats, Jordi; Bugeda Castelltort, Gabriel; Oñate Ibáñez de Navarra, Eugenio; ZARATE, FRANCISCO; Hurtado Gómez, Jorge Eduardo
    8th World Congress on Structural and Multidisciplinary Optimization
    p. 1-16
    Presentation's date: 2009-06-03
    Presentation of work at congresses

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    Optimization is becoming an important field of research. The availability of more powerful computational resources, the ever-seek better performance and the company needs regarding time-to-market reduction, leaded to the necessity of better designs in less time. Aeronautics field has not been an exemption; shape optimization is a largely studied problem. It can be applied to many disciplines in this field, always intended to improve existing performances, and reduce costs and annoying characteristics like noise or consumption. Traditionally, optimization procedures were based on deterministic methodologies [6] so, it means that optimization leads to an optimum value which is an optimal point. Engineers have realized that this optimal point is no longer their aim. They need to ensure the optimal behaviour in the whole operating range; if they do not consider what happens in the vicinity of this point, a problem can arise. That is, in many cases, if the working point differs from the original, even a little distance, efficiency is reduced considerably [9]. Non deterministic methodologies have been applied to many fields [7][8], but the time consuming calculations required on CFD avoid to be applied to shape optimization. The study of the variability of the result against variability of the input parameters is a better representation of the real world; using these kinds of methodologies we can simulate from manufacturing tolerances to unknown measurement errors. The result is no longer a point, but a range or a set of values which defines the area where, in average, optimal output values are obtained. The optimal value could be worse than other optima, but considering its vicinity, it is clearly the best. This communication presents the development of a non-deterministic strategy coupled with optimization techniques. The main aim is the definition of an optimization procedure that ensure greater robustness of the solution than usual procedures. In order to reach this aim, probabilistic data will be used to define input parameters, and applied to each one of the members defined by the optimizer. In our case, we will use a genetic algorithm as optimizer.

  • Multi-element airfoil lift maximization problems with uncertainities using evolutionary optimization and unstructured meshes

     Oñate Ibáñez de Navarra, Eugenio; Bugeda Castelltort, Gabriel; Zhili, Tang; Periaux, Jacques
    World Congress on Computational Mechanics
    Presentation's date: 2008-07
    Presentation of work at congresses

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  • Low cost adaptive remeshing strategies for the solution of structural shape optimization problems using hybrid (evolutionary-gradient) methods

     Bugeda Castelltort, Gabriel; Ródenas, Juan José; Fuenmayor, F.J.; Oñate Ibáñez de Navarra, Eugenio
    World Congress on Computational Mechanis and European Congres on Computational Methods in Applied Sciences and Engineering
    Presentation's date: 2008
    Presentation of work at congresses

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  • Control of the finite element discretization error during the convergence of structural shape optimization algorithms

     Bugeda Castelltort, Gabriel; Ródenas, Juan J; Albelda, José; Oñate Ibáñez de Navarra, Eugenio
    Second Internacional Conference on Multidisciplinary Design Optimization and Applications
    p. 17-28
    Presentation of work at congresses

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  • Non-deterministic shape optimization in aeronautics

     Pons-Prats, Jordi; Oñate Ibáñez de Navarra, Eugenio; Zarate Araiza, Jose Francisco; Bugeda Castelltort, Gabriel; Hurtado Gómez, Jorge Eduardo
    12th AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference
    p. 1-12
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  • Control of the finite element discretization error during the convergence of structural shape optimization algorithms

     Bugeda Castelltort, Gabriel
    Second Internacional Conference on Multidisciplinary Design Optimization and Applications
    Presentation's date: 2008-09-03
    Presentation of work at congresses

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  • An integration of a low cost adaptive remeshing strategy in the solution of structural shape optimization problems using evolutionary methods

     Bugeda Castelltort, Gabriel; Rodenas, J J; Oñate Ibáñez de Navarra, Eugenio
    Computers & structures
    Vol. 86, num. 13-14, p. 1563-1578
    Date of publication: 2008-07
    Journal article

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  • Influence of the finite element discretization error over the convergence of structural shape optimization algorithms

     Bugeda Castelltort, Gabriel; Ródenas, Juan J; Albelda, José; Oñate Ibáñez de Navarra, Eugenio
    IEEE Congress on Evolutionary Computation
    p. 1-8
    Presentation of work at congresses

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  • Influence of the finite element discretization error over the convergence of structural shape optimization algorithms

     Ródenas, J J; Bugeda Castelltort, Gabriel; Albelda, José; Oñate Ibáñez de Navarra, Eugenio
    2007 IEEE Congress on Evolutionary Computation (CEC2007)
    p. 1-2
    Presentation's date: 2007
    Presentation of work at congresses

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  • Shape optimization and adapted meshes in solid mechanics

     Bugeda Castelltort, Gabriel
    AEROCHINA2 China-Europe Open Worksop on Integrated Computational and Experimental Multiphysics for New Challenges in Aeronautics
    Presentation's date: 2007-10-22
    Presentation of work at congresses

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  • 3D Semi-structured meshing and hydrodynamic modelling in coastal domains. Tarragona harvour case study

     Maidana, Manuel Augusto; Grifoll Colls, Manel; Espino Infantes, Manel; Blasco Lorente, Jorge; Bugeda Castelltort, Gabriel; Escolano, E; Pasenau, M
    MARINE 2007. Computational Methods in Marine Engineering
    p. 177-180
    Presentation of work at congresses

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