Now showing items 88-107 of 171

    • Lagged and instantaneous dynamical influences related to brain structural connectivity 

      Alonso C.; Diez I.; Remaki L.; Escudero I.; Mateos B.; Rosseel Y.; Marinazzo D.; Stramaglia S.; Cortes J.M. (Frontiers in Psychology, 2015-12-31)
      Contemporary neuroimaging methods can shed light on the basis of human neural and cognitive specializations, with important implications for neuroscience and medicine. Indeed, different MRI acquisitions provide different ...
    • Layout Optimisation of Wave Energy Converter Arrays 

      Mercadé Ruiz P.; Nava V.; Topper M. B. R.; Ruiz Minguela P.; Ferri F.; Kofoed J. P. (Energies, 2017-08-24)
      This paper proposes an optimisation strategy for the layout design of wave energy converter (WEC) arrays. Optimal layouts are sought so as to maximise the absorbed power given a minimum q-factor, the minimum distance between ...
    • LBM-HPC - An open-source tool for fluid simulations. Case study: Unified parallel C (UPC-PGAS) 

      Valero-Lara P.; Jansson J. (Proceedings - IEEE International Conference on Cluster Computing, ICCC, 2015-12-31)
      The main motivation of this work is the evaluation of the Unified Parallel C (UPC) model, for Boltzmann-fluid simulations. UPC is one of the current models in the so-called Partitioned Global Address Space paradigm. This ...
    • Leveraging the Performance of LBM-HPC for Large Sizes on GPUs using Ghost Cells 

      Valero-Lara P. (ICA3PP: 15th International Conference on Algorithms and Architectures for Parallel Processing, 2016-11-10)
      Today, we are living a growing demand of larger and more efficient computational resources from the scienti c community. On the other hand, the appearance of GPUs for general purpose computing supposed an important advance ...
    • Leveraging the performance of LBM-HPC for large sizes on GPUs using ghost cells 

      Valero-Lara P. (Algorithms and Architectures for Parallel Processing, 2016-11-25)
      Today, we are living a growing demand of larger and more efficient computational resources from the scientific community. On the other hand, the appearance of GPUs for general purpose computing supposed an important advance ...
    • Local nonobtuse tetrahedral refinements around an edge 

      Korotov S.; Křížek M. (Applied Mathematics and Computation, 2013-12-31)
      In this note we show how to generate and conformly refine nonobtuse tetrahedral meshes locally around and towards an edge so that all dihedral angles of all resulting tetrahedra remain nonobtuse. The proposed technique can ...
    • Low cost a posteriori error estimators for an augmented mixed FEM in linear elasticity. Dedicated to Professor Rodolfo Rodríguez on the occasion of his 60th birthday. 

      Barrios T.P.; Behrens E.M.; Gonzalez M. (Applied Numerical Mathematics, 2014-12-31)
      We consider an augmented mixed finite element method applied to the linear elasticity problem and derive a posteriori error estimators that are simpler and easier to implement than the ones available in the literature. In ...
    • Magnetotelluric characterization of the alhama de murcia fault (Eastern Betics) - Preliminary results 

      Martí A.; Queralt P.; Ledo J.J.; Marcuello A.; Alvarez-Aramberri J.; Martínez-Díaz J.J. (22nd European Meeting of Environmental and Engineering Geophysics, Near Surface Geoscience 2016, 2016-12-31)
      The Lorca Earthquake (11/5/2011, Mw 5.2) stands as the most destructive in Spain over the last 50 years. It was interpreted as having occurred in an intersegment zone of the strike-slip Alhama de Murcia Fault (AMF). Within ...
    • Many-task computing on many-core architectures 

      Valero-Lara P.; Nookala P.; Pelayo F.L.; Jansson J.; Dimitropoulos S.; Raicu I. (Scalable Computing, 2016-01-01)
      Many-Task Computing (MTC) is a common scenario for multiple parallel systems, such as cluster, grids, cloud and supercomputers, but it is not so popular in shared memory parallel processors. In this sense and given the ...
    • Modeling of bone conduction of sound in the human head using hp-finite elements: Code design and verification 

      Demkowicz L.; Gatto P.; Kurtz J.; Paszynski M.; Rachowicz W.; Bleszyński E.; Bleszyński M.; Hamilton M.; Champlin C.; Pardo D. (Computer Methods in Applied Mechanics and Engineering, 2011-12-31)
      We focus on the development of a reliable numerical model for investigating the bone-conduction of sound in the human head. The main challenge of the problem is the lack of fundamental knowledge regarding the transmission ...
    • A multi-domain decomposition-based Fourier finite element method for the simulation of 3D marine CSEM measurements 

      Bakr S.A.; Pardo D. (Computational Geosciences, 2017-01-01)
      We introduce a multi-domain decomposition Fourier finite element (MDDFFE) method for the simulation of three-dimensional (3D) marine controlled source electromagnetic measurement (CSEM). The method combines a 2D finite ...
    • Multi-domain grid refinement for lattice-Boltzmann simulations on heterogeneous platforms 

      Valero-Lara P.; Jansson J. (Proceedings - IEEE 18th International Conference on Computational Science and Engineering, CSE 2015, 2016-01-01)
      The main contribution of the present work consists of several parallel approaches for grid refinement based on a multi-domain decomposition for lattice-Boltzmann simulations. The proposed method for discretizing the fluid ...
    • Multi-objective hierarchic memetic solver for inverse parametric problems 

      Gajda-Zagórska E.; Smolka M.; Schaefer R.; Pardo D.; Alvarez-Aramberri J. (Procedia Computer Science, 2015-12-31)
      We propose a multi-objective approach for solving challenging inverse parametric problems. The objectives are misfits for several physical descriptions of a phenomenon under consideration, whereas their domain is a common ...
    • A multi-objective memetic inverse solver reinforced by local optimization methods 

      Gajda-Zagórska E.; Schaefer R.; Smołka M.; Pardo D.; Alvarez-Aramberri J. (Journal of Computational Science, 2016-09-01)
      We propose a new memetic strategy that can solve the multi-physics, complex inverse problems, formulated as the multi-objective optimization ones, in which objectives are misfits between the measured and simulated states ...
    • Multipreconditioned GMRES for Shifted Systems 

      Bakhos T.; Kitanidis P.K.; Ladenheim S.; Saibaba A.K.; Szyld D. (SIAM Journal on Scientific Computing, 2017-01-01)
      An implementation of GMRES with multiple preconditioners (MPGMRES) is proposed for solving shifted linear systems with shift-and-invert preconditioners. With this type of preconditioner, the Krylov subspace can be built ...
    • Necking in 2D incompressible polyconvex materials: theoretical framework and numerical simulations 

      Mora-Corral C.; Strugaru M. (Quarterly Journal of Mechanics and Applied Mathematics, 2017-06-15)
      We show examples of 2D incompressible isotropic homogeneous hyperelastic materials with a poly-convex stored-energy function that present necking. The construction of the stored-energy function of amaterial satisfying all ...
    • New Simplified Algorithm for the Multiple Rotating Frame Approach in Computational Fluid Dynamics 

      Remaki L.; Ramezani A.; Blanco J. M.; Garcia I. (Journal of Fluids Engineering, 2017-06-02)
      This paper deals with rotating effects simulation of steady flows in turbomachinery. To take into account the rotating nature of the flow, the frozen rotor approach is one of the widely used approaches. This technique, ...
    • New Theory of Flight 

      Hoffman J.; Jansson J.; Claes J. (Journal of Mathematical Fluid Mechanics, 2016-01-01)
      We present a new mathematical theory explaining the fluid mechanics of subsonic flight, which is fundamentally different from the existing boundary layer-circulation theory by Prandtl–Kutta–Zhukovsky formed 100 year ago. ...
    • Non-conforming curved finite element schemes for time-dependent elastic-acoustic coupled problems 

      Rodríguez-Rozas A.; Diaz J. (Journal of Computational Physics, 2016-01-01)
      High-order numerical methods for solving time-dependent acoustic-elastic coupled problems are introduced. These methods, based on Finite Element techniques, allow for a flexible coupling between the fluid and the solid ...
    • Nonlinear computations of heave motions for a generic Wave Energy Converter 

      Janson C.-E.; Shiri A.; Jansson J.; Moragues Ginard M.; Castanon D.; Saavedra L.; Degirmenci C.; Leoni M. (In Vittorio Bucci Alberto Marinò (Eds.), Technology and Science for the Ships of the Future, Proceedings of NAV 2018: 19th International Conference on Ship and Maritime Research, IOS Press BV, 2018)
      A bench-marking activity of numerical methods for analysis of Wave Energy Converters (WEC) was proposed under the Ocean Energy Systems (OES) International Energy Agency (IEA) Task 10 in 2015. The purpose of the benchmark ...