Mostrando ítems 41-60 de 152

    Mixed finite elements with independent strain interpolation for isotropic and orthotropic damage 

    Barbat Vlad, Gabriel (Fecha de defensa: 2021-02-11)

    The numerical modelling of fracture has been an active topic of research for over five decades. Most of the approaches employed rely on the use of the Finite Element Method, which has shown to be an effective and cost-efficient ...

    Advanced numerical techniques for inverse problems in geophysics 

    Ortega Gelabert, Olga (Fecha de defensa: 2020-12-18)

    This thesis presents an efficient methodology to couple Model Order Reduction techniques within the framework of geophysical probabilistic inversion problems. Accurate models of the interaction between Earth inner processes ...

    Nuevo modelo de peaje urbano vinculado a una segregación del tráfico por niveles de calidad 

    Hormigo Ventura, Juan Pedro (Fecha de defensa: 2020-11-25)

    Urban tolls are nowadays one of the most promising instruments to regulate the entry of vehicles into cities, given the flexibility and versatility granted by the available technology. Although, initially, they represent ...

    Adaptive low and high-order hybridized methods for unsteady incompressible flow simulations 

    Karkoulias, Alexandros (Fecha de defensa: 2020-06-17)

    Simulations of incompressible flows are performed on a daily basis to solve problems of practical and industrial interest in several fields of engineering, including automotive, aeronautical, mechanical and biomedical ...

    Large-scale tree-based unfitted finite elements for metal additive manufacturing 

    Miranda Neiva, Eric (Fecha de defensa: 2020-10-07)

    This thesis addresses large-scale numerical simulations of partial differential equations posed on evolving geometries. Our target application is the simulation of metal additive manufacturing (or 3D printing) with powder-bed ...

    Coastal risk forecast system : fostering proactive management at the Catalan coast 

    García León, Manuel (Fecha de defensa: 2018-07-10)

    The action of sea storms is one of the most complex littoral processes with deep management implications. Along the Catalan shoreline which is about 700 km long, 190 km are subject to erosion and/or flooding. Around one ...

    Finite calculus. A stabilized finite element method for solving the Navier-Stokes equations. Application to ocean turbulence 

    Lamorena German, Arnel (Fecha de defensa: 2020-09-17)

    Ocean turbulence is a classic example of turbulent motion and observations of turbulence in the ocean lack in regions of complex topography since in-situ and experimental data are complicated to obtain. As a result, ocean ...

    Innovative mathematical and numerical models for studying the deformation of shells during industrial forming processes with the Finite Element Method 

    Mataix Ferrándiz, Vicente (Fecha de defensa: 2020-09-03)

    The doctoral thesis "Innovative mathematical and numerical models for studying the deformation of shells during industrial forming processes with the Finite Element Method" aims to contribute to the development of finite ...

    High-order hybridizable discontinuous Galerkin formulation and implicit Runge-Kutta schemes for multiphase flow through porous media 

    Costa Solé, Albert (Fecha de defensa: 2020-07-17)

    This dissertation presents high-order hybridisable discontinuous Galerkin (HDG) formulations coupled with implicit Runge-Kutta (RK) methods for the simulation of one-phase flow and two-phase flow problems. High-order-methods ...

    Stabilized reduced order models for low speed flows 

    Reyes Sotomayor, Ricardo (Fecha de defensa: 2020-03-23)

    This thesis presents the a stabilized projection-based Reduced Order Model (ROM) formulation in low speed fluid flows using a Variational Multi-Scale (VMS) approach. To develop this formulation we use a Finite Element (FE) ...

    Technical-economic analysis, modeling and optimization of floating offshore wind farms 

    Lerch, Markus (Fecha de defensa: 2020-03-09)

    The offshore wind sector has grown significantly during the last decades driven by the increasing demand for clean energy and to reach defined energy targets based on renewable energies. As the wind speeds tend to be faster ...

    Hybrid CPU/GPU implementation for the FE2 multi-scale method for composite problems 

    Giuntoli, Guido (Fecha de defensa: 2020-01-30)

    This thesis aims to develop a High-Performance Computing implementation to solve large composite materials problems through the use of the FE2 multi-scale method. Previous works have not been able to scale the FE2 strategy ...

    Modeling present and future freeway management strategies : variable speed limits, lane-changing and platooning of connected autonomous vehicles 

    Sala Sanmartí, Marcel (Fecha de defensa: 2019-10-29)

    Freeway traffic management is necessary to improve capacity and reduce congestion, especially in metropolitan freeways where the rush period lasts several hours per day. Traffic congestion implies delays and an increase ...

    Decision analysis under uncertainity for sustainable development 

    Ezbakhe, Fatine (Fecha de defensa: 2019-10-31)

    Policy-making for sustainable development becomes more efficient when it is reliably backed by evidence-based decision analysis. Concretely, this is crucial in the planning of public services delivery. By translating "raw" ...

    Monotonicity-preserving finite element methods for hyperbolic problems 

    Bonilla de Toro, Jesús (Fecha de defensa: 2019-12-17)

    This thesis covers the development of monotonicity preserving finite element methods for hyperbolic problems. In particular, scalar convection-diffusion and Euler equations are used as model problems for the discussion in ...

    Identifying and managing hotspots to extreme events : application to NW Mediterranean conditions 

    Sanuy Vázquez, Marc (Fecha de defensa: 2019-11-05)

    The impact of coastal storms is one of the costliest forms of natural disaster, as it affects a particularly valuable fringe both from the socioeconomic and ecologic perspectives. In addition, storm-induced erosion and ...

    Computational vademecums for lattice materials using algebraic PGD 

    Sibileau, Alberto Pedro (Fecha de defensa: 2019-09-24)

    This dissertation is motivated by the concept of materials by design. Focusing on structures, this states that the properties in a mechanical component are not only inherited by its constituent material, but also by the ...

    Design of reliable schedules and control strategies for improving bus system performance 

    Mension i Camps, Josep (Fecha de defensa: 2019-09-10)

    High-level service bus systems, even though in many different forms and local particularities, have been spread out around the globe over the last decades, driven by the administration and the transport authority, and in ...

    Zero-thickness interface elements in petroleum geomechanics : sand production and hydraulic fracture 

    Garolera Vinent, Daniel (Fecha de defensa: 2017-09-18)

    This thesis describes the extension of the Finite Element Method with zero-thickness interface elements (FEM+z) to 3D, large and complex problems in geomaterials, with special interest in petroleum geomechanics. This general ...

    Experimental analysis of soil cracking due to environmental conditions 

    Cordero Arias, Josbel Andreina (Fecha de defensa: 2019-09-09)

    This thesis presents an experimental approach on the subject of cracking in soils due to changes in environmental conditions, where research is mainly directed to the soil-air interface and the effect of boundary conditions. ...