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  • 2D comparative study of vertical axis wind and tidal turbines with a p-adaptive hybridizable Discontinuous Galerkin method and ANSYS Fluent

     de Villardi de Montlaur, Adeline; Giorgiani, Giorgio
    Congreso de Métodos Numéricos en Ingeniería
    Presentation's date: 2013-06-25
    Presentation of work at congresses

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  • Ciencia en Acción

     Gutierrez Cabello, Jorge Luis; Berenguer Sau, Jordi; de Villardi de Montlaur, Adeline
    Award or recognition

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  • Formation of tip-vortices on triangular prismatic-shaped cliffs. Part 1: A wind tunnel study

     Cochard, S.; Letchford, C.W.; Earl, T. A.; de Villardi de Montlaur, Adeline
    Journal of wind engineering and industrial aerodynamics
    Date of publication: 2012
    Journal article

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    Speed-up over topography has long been recognized as significant for structural design and wind energy applications. Here wind flow over cliffs that have a sawtooth plan are studied for speed-up effects under different wind directions. The study undertook PIV measurements to document the mean and turbulence changes in three dimensions for simulated atmospheric boundary layer flow in the University of Sydney BLWT. As the flow approaches the cliffs, it accelerates and moves up to pass the obstruction and generates two strong vortices on the top surface of the cliff. Small changes in wind direction not only lead to significantly different speed-up ratios, but also influence the location of the vortices and the level of turbulence. The complexity of the flow field is revealed in this unique three-dimensional study.

  • Formation of tip-vortices on triangular prismatic-shaped cliffs. Part 2: A computational fluid dynamics study

     de Villardi de Montlaur, Adeline; Cochard, S.; Fletcher, D.F.
    Journal of wind engineering and industrial aerodynamics
    Date of publication: 2012
    Journal article

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    The flow over triangular-shaped cliffs is studied through Computational Fluid Dynamics simulations, using the RANS approach closed with the SST turbulence model. The formation of tip-vortices on the sides of the cliff is studied, taking into account the influence of the cliff geometry and the incoming wind. CFD results are compared with experimental data on 2D planes located above the cliff. Good agreement between the two is obtained once small experimental deviations from the nominal cliff geometry are accounted for in the simulations. In addition, 3D results, such as visualization of the vortices, allow a better understanding of the complex flow over such geometry to be achieved.

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    High-order implicit time integration for unsteady incompressible flows  Open access

     de Villardi de Montlaur, Adeline; Fernandez Mendez, Sonia; Huerta Cerezuela, Antonio
    International journal for numerical methods in fluids
    Date of publication: 2012-10-20
    Journal article

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    The spatial discretization of unsteady incompressible Navier–Stokes equations is stated as a system of differential algebraic equations, corresponding to the conservation of momentum equation plus the constraint due to the incompressibility condition. Asymptotic stability of Runge–Kutta and Rosenbrock methods applied to the solution of the resulting index-2 differential algebraic equations system is analyzed. A critical comparison of Rosenbrock, semi-implicit, and fully implicit Runge–Kutta methods is performed in terms of order of convergence and stability. Numerical examples, considering a discontinuous Galerkin formulation with piecewise solenoidal approximation, demonstrate the applicability of the approaches and compare their performance with classical methods for incompressible flows.

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    Vortex formation above prismatic-shaped cliffs; an experimental and numerical investigation  Open access

     de Villardi de Montlaur, Adeline
    Australasian Wind Engineering Society Workshop
    Presentation's date: 2012-02-23
    Presentation of work at congresses

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  • Métodos Runge-Kutta implícitos de alto orden para flujos incompresibles

     de Villardi de Montlaur, Adeline; Fernandez Mendez, Sonia; Huerta Cerezuela, Antonio
    Revista internacional de métodos numéricos para cálculo y diseño en ingeniería
    Date of publication: 2011
    Journal article

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  • High-order discontinuous Galerkin methods for incompressible flows

     de Villardi de Montlaur, Adeline; Fernandez Mendez, Sonia; Huerta Cerezuela, Antonio
    International Conference on Finite Elements in Flow Problems
    Presentation's date: 2011-04-24
    Presentation of work at congresses

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    Discontinuous Galerkin methods for the Navier¿Stokes equations using solenoidal approximations  Open access

     de Villardi de Montlaur, Adeline; Fernandez Mendez, Sonia; Peraire Guitart, Jaume; Huerta Cerezuela, Antonio
    International journal for numerical methods in fluids
    Date of publication: 2010-10-20
    Journal article

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    An interior penalty method and a compact discontinuous Galerkin method are proposed and compared for the solution of the steady incompressible Navier–Stokes equations. Both compact formulations can be easily applied using high-order piecewise divergence-free approximations, leading to two uncoupled problems: one associated with velocity and hybrid pressure, and the other one only concerned with the computation of pressures in the elements interior. Numerical examples compare the efficiency and the accuracy of both proposed methods.

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    Effectiveness of Problem Based Learning for Engineering Curriculum  Open access

     Rojas Gregorio, Jose Ignacio; Prats Menéndez, Xavier; de Villardi de Montlaur, Adeline; Valero Garcia, Miguel; Garcia-berro Montilla, Enrique
    Date of publication: 2010
    Book chapter

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    The main purpose of this paper is to describe the process by which an initially limited-range practical experience, within the frame of a given subject in an aerospace engineering degree, might be expanded to become the mother-subject itself. Particularly, the practical experience is a Model Rocket Workshop (MRW), where students design, simulate, build, test and launch a small model rocket. The workshop is a Problem Based Learning (PBL) experience that covers a wide spectrum of educational aspects, ranging from theoretical disciplines, such as fluid dynamics and rocket dynamics, to topics more related to experimental work and hardware utilization like the certification of the rockets, as well as the rocket altitude measurements. Students get rapidly involved in the project, and acquire several practical and transversal abilities, while developing a solid knowledge of the physics underlying aerospace engineering. The case study shows some problems and improvements, academic results and lessons learned from the PBL approach. Finally, a series of new ideas related to MRW and the subject it belongs to are presented. The objective is to expand the MRW so that it embraces the totality of the activities that constitute this mother-subject. As a consequence, the former would then become a new subject entirely based on PBL. The strategy aims at enabling an optimum transition from conventional learning to PBL.

  • Advanced Techniques in Computinal Mechanics

     Diez Mejia, Pedro; de Villardi de Montlaur, Adeline; Fernandez Mendez, Sonia; Zlotnik, Sergio; Huerta Cerezuela, Antonio
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  • Connecteu-aerospace.cat

     Collado Gomez, Juan Carlos; Prats Menéndez, Xavier; Berenguer Sau, Jordi; de Villardi de Montlaur, Adeline; Mateu Mateu, Jordi
    Participation in a competitive project

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    High-Order discontinuous Galerkin methods for incompressible flows  Open access

     de Villardi de Montlaur, Adeline; Fernandez Mendez, Sonia; Huerta Cerezuela, Antonio
    European Conference on Computational Fluid Dynamics
    Presentation's date: 2010-06-15
    Presentation of work at congresses

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    The spatial discretization of the unsteady incompressible Navier-Stokes equations is stated as a system of Differential Algebraic Equations (DAEs), corresponding to the conservation of momentum equation plus the constraint due to the incompressibility condition. Runge-Kutta methods applied to the solution of the resulting index-2 DAE system are analyzed, allowing a critical comparison in terms of accuracy of semi-implicit and fully implicit Runge-Kutta methods. Numerical examples, considering a discontinuous Galerkin Interior Penalty Method with piecewise solenoidal approximations, demonstrate the applicability of the approach, and compare its performance with classical methods for incompressible flows.

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    High-order methods with LES model for incompressible flows  Open access

     de Villardi de Montlaur, Adeline; Rebay, Stefano; Fernandez Mendez, Sonia; Huerta Cerezuela, Antonio
    Workshop on research in turbulence and transition
    Presentation's date: 2010-10-29
    Presentation of work at congresses

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  • MÈTODES NUMÈRICS EN CIÈNCIES APLICADES I ENGINYERIA

     Roca Navarro, Francisco Javier; Giorgiani, Giorgio; Zlotnik, Sergio; Fernandez Mendez, Sonia; Rodriguez Ferran, Antonio; Muñoz Romero, Jose Javier; Arias Vicente, Irene; de Villardi de Montlaur, Adeline; Sarrate Ramos, Jose; Diez Mejia, Pedro; Arroyo Balaguer, Marino; Sevilla Cardenas, Ruben; Parés Mariné, Núria; Casoni Rero, Eva; Ruiz Girones, Eloi; Modesto Galende, David; Millan, Raul Daniel; Abdollahi Hosnijeh, Amir; Steffens, Lindaura Maria; Discacciati, Marco; Shen, Yongxing; Rahimi Lenji, Mohammad; Tamayo Mas, Elena; Diaz Cereceda, Cristina; Prat Robles, David; Verdugo Rojano, Francesc; Zhang, Kuan; Estela Carbonell, M. Rosa; Peco Regales, Christian; Huerta Cerezuela, Antonio
    Participation in a competitive project

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  • Métodos de Galerkin Discontinuos con Aproximaciones Solenoidales para Ecuaciones de Navier-Stokes Incompresibles

     de Villardi de Montlaur, Adeline; Fernandez Mendez, Sonia; Peraire, J; Huerta Cerezuela, Antonio
    Congreso de Métodos Numéricos en Ingeniería
    Presentation's date: 2009-06-29
    Presentation of work at congresses

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  • Métodos implícitos runge-kutta de alto orden para flujos incompresibles transitorios

     de Villardi de Montlaur, Adeline; Fernandez Mendez, Sonia; Huerta Cerezuela, Antonio
    Congreso de Métodos Numéricos en Ingeniería
    Presentation's date: 2009-06-29
    Presentation of work at congresses

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  • High-order discontinuous Galerkin methods for incompressible flows  Open access

     de Villardi de Montlaur, Adeline
    Defense's date: 2009-09-22
    Universitat Politècnica de Catalunya
    Theses

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    Aquesta tesi doctoral proposa formulacions de Galerkin discontinu (DG) d'alt ordre per fluxos viscosos incompressibles. Es desenvolupa un nou mètode de DG amb penalti interior (IPM-DG), que condueix a una forma feble simètrica i coerciva pel terme de difusió, i que permet assolir una aproximació espacial d'alt ordre. Aquest mètode s'aplica per resoldre les equacions de Stokes i Navier-Stokes. L'espai d'aproximació de la velocitat es descompon dins de cada element en una part solenoidal i una altra irrotacional, de manera que es pot dividir la forma dèbil IPM-DG en dos problemes desacoblats. El primer permet el càlcul de les velocitats i de les pressions híbrides, mentre que el segon calcula les pressions en l'interior dels elements. Aquest desacoblament permet una reducció important del número de graus de llibertat tant per velocitat com per pressió. S'introdueix també un paràmetre extra de penalti resultant en una formulació DG alternativa per calcular les velocitats solenoidales, on les pressions no apareixen. Les pressions es poden calcular com un post-procés de la solució de les velocitats. Es contemplen altres formulacions DG, com per exemple el mètode Compact Discontinuous Galerkin, i es comparen al mètode IPM-DG. Es proposen mètodes implícits de Runge-Kutta d'alt ordre per problemes transitoris incompressibles, permetent obtenir esquemes incondicionalment estables i amb alt ordre de precisió temporal. Les equacions de Navier-Stokes incompressibles transitòries s'interpreten com un sistema de Equacions Algebraiques Diferencials, és a dir, un sistema d'equacions diferencials ordinàries corresponent a la equació de conservació del moment, més les restriccions algebraiques corresponent a la condició d'incompressibilitat. Mitjançant exemples numèrics es mostra l'aplicabilitat de les metodologies proposades i es comparen la seva eficiència i precisió.

    This PhD thesis proposes divergence-free Discontinuous Galerkin formulations providing high orders of accuracy for incompressible viscous flows. A new Interior Penalty Discontinuous Galerkin (IPM-DG) formulation is developed, leading to a symmetric and coercive bilinear weak form for the diffusion term, and achieving high-order spatial approximations. It is applied to the solution of the Stokes and Navier-Stokes equations. The velocity approximation space is decomposed in every element into a solenoidal part and an irrotational part. This allows to split the IPM weak form in two uncoupled problems. The first one solves for velocity and hybrid pressure, and the second one allows the evaluation of pressures in the interior of the elements. This results in an important reduction of the total number of degrees of freedom for both velocity and pressure. The introduction of an extra penalty parameter leads to an alternative DG formulation for the computation of solenoidal velocities with no presence of pressure terms. Pressure can then be computed as a post-process of the velocity solution. Other DG formulations, such as the Compact Discontinuous Galerkin method, are contemplated and compared to IPM-DG. High-order Implicit Runge-Kutta methods are then proposed to solve transient incompressible problems, allowing to obtain unconditionally stable schemes with high orders of accuracy in time. For this purpose, the unsteady incompressible Navier-Stokes equations are interpreted as a system of Differential Algebraic Equations, that is, a system of ordinary differential equations corresponding to the conservation of momentum equation, plus algebraic constraints corresponding to the incompressibility condition. Numerical examples demonstrate the applicability of the proposed methodologies and compare their efficiency and accuracy.

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    Discontinuous Galerkin methods for the Stokes equations using divergence-free approximations  Open access

     de Villardi de Montlaur, Adeline; Fernandez Mendez, Sonia; Huerta Cerezuela, Antonio
    International journal for numerical methods in fluids
    Date of publication: 2008-07
    Journal article

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    A discontinuous Galerkin (DG) method with solenoidal approximation for the simulation of incompressible flow is proposed. It is applied to the solution of the Stokes equations. The interior penalty method is employed to construct the DG weak form. For every element, the approximation space for the velocity field is decomposed as the direct sum of a solenoidal space and an irrotational space. This allows to split the DG weak form into two uncoupled problems: the first one solves for the velocity and the hybrid pressure (pressure along the mesh edges) and the second one allows the computation of the pressure in the element interior. Furthermore, the introduction of an extra penalty term leads to an alternative DG formulation for the computation of solenoidal velocities with no presence of pressure terms. Pressure can then be computed as a post-process of the velocity solution. Numerical examples demonstrate the applicability of the proposed methodologies.

    This is the pre-peer reviewed version of the following article: Montlaur, A.; Fernandez, S.; Huerta, A. Discontinuous Galerkin methods for the Stokes equations using divergence-free approximations. "International journal for numerical methods in fluids", Juliol 2008, vol. 57, núm. 9, p. 1071-1092., which has been published in final form at http://www3.interscience.wiley.com/journal/117953707/abstract?CRETRY=1&SRETRY=0

    Postprint (author’s final draft)

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    Model rocket workshop: a problem-based learning experience for engineering students  Open access

     Rojas Gregorio, Jose Ignacio; Prats Menéndez, Xavier; de Villardi de Montlaur, Adeline; Garcia-berro Montilla, Enrique
    International journal: emerging technologies in learning
    Date of publication: 2008-09
    Journal article

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    A Problem-Based Learning (PBL) experience for undergraduate students of aerospace engineering is described in this paper. The experience allows the students to build a model rocket using materials which can be easily obtained. They also compute all the relevant quantities to design and characterize the rocket and they test the robustness of their design. They furthermore launch the rocket with the corresponding payload and verify the flight parameters using an on-board altimeter. Finally, they also compare the flight parameters with the theoretically expected values. Using this simple scheme the students are later introduced in the simulation of complex flows, using standard techniques. We find that our students get rapidly involved in the project, allowing them to acquire several practical abilities, besides developing an accurate knowledge of the physics of rockets and of fluid dynamics.

  • Un Método de Galerkin Discontinuo Con Interpolación Solenoidal para las Ecuaciones de Stokes Incompresibles

     Huerta Cerezuela, Antonio; de Villardi de Montlaur, Adeline; Fernandez Mendez, Sonia
    Congresso de Métodos Numéricos em Engenharia
    Presentation's date: 2007-06-13
    Presentation of work at congresses

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  • Premi a la Qualitat en la Docència Universitària del Consell Social de la UPC

     Rojas Gregorio, Jose Ignacio; Prats Menéndez, Xavier; de Villardi de Montlaur, Adeline; Garcia-berro Montilla, Enrique
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  • Modelización numérica de flujos, solidos y estructuras para aplicaciones industriales

     de Villardi de Montlaur, Adeline; Diez Mejia, Pedro; Estela Carbonell, M. Rosa; Arias Vicente, Irene; Fernandez Mendez, Sonia; Sarrate Ramos, Jose; Vidal Segui, Yolanda; Parés Mariné, Núria; Sevilla Cardenas, Ruben; Casoni Rero, Eva
    Participation in a competitive project

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  • A locally conservative discontinous Galekin Method with Solenoidal Interpolation and Uncoupled Pressure Velocity for the stokes equations

     de Villardi de Montlaur, Adeline; Fernandez Mendez, Sonia; Huerta Cerezuela, Antonio
    Cinquenes Jornades sobre Mètodes Numèrics en Ciènces Aplicades i Enginyeria
    Presentation of work at congresses

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  • Model rocket workshop

     de Villardi de Montlaur, Adeline; Prats Menéndez, Xavier; Rojas Gregorio, Jose Ignacio; Garcia-berro Montilla, Enrique
    III Jornadas Internacionales de innovación universitaria. Metodos docentes afines al EEES
    Presentation's date: 2006-09-14
    Presentation of work at congresses

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  • III Premio UEM a la innovación docente

     Garcia-berro Montilla, Enrique; Rojas Gregorio, Jose Ignacio; de Villardi de Montlaur, Adeline; Prats Menéndez, Xavier
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  • Informes de progreso Noviembre 2004-Junio 2005

     de Villardi de Montlaur, Adeline; Rojas Gregorio, Jose Ignacio; Crespo Artiaga, Daniel
    Date: 2005-06
    Report

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  • Un método de Galerkin discontinuo con interpolación solenoidal para la resolución de las ecuaciones de Stokes

     Fernandez Mendez, Sonia; de Villardi de Montlaur, Adeline; Huerta Cerezuela, Antonio
    Congreso de Ecuaciones Diferenciales y Aplicaciones / Congreso de Matemática Aplicada
    Presentation of work at congresses

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