Recent Submissions

  • Time-resolved Adaptive Direct FEM Simulation of High-lift Aircraft Configurations 

    Jansson J.; Krishnasamy E.; Leoni M.; Jansson N.; Hoffman J. (Numerical simulation of the aerodynamics of high-lift configurations, 2017-08-01)
    Our simulation methodology is referred to as Direct FEM Simulation (DFS), or General Galerkin (G2) and uses a finite element method (FEM) with piecewise linear approximation in space and time, and with numerical stabilization ...
  • Towards HPC-Embedded Case Study: Kalray and Message-Passing on NoC 

    Valero-Lara P.; Krishnasamy E.; Jansson J. (Scalable Computing, 2017)
    Today one of the most important challenges in HPC is the development of computers with a low power consumption. In this context, recently, new embedded many-core systems have emerged. One of them is Kalray. Unlike other ...
  • Towards the development of adaptive finite element methods for internal flow aeroacoustics 

    de Abreu R.V.; Hoffman J.; Jansson J. (19th AIAA/CEAS Aeroacoustics Conference, 2013-12-31)
    We report the latest results obtained in the development of an adaptive finite element method for computational aeroacoustics (CAA). The new methodology is based on the General Galerkin (G2) method, which has been successfully ...
  • Computation of slat noise sources using adaptive FEM and lighthill's analogy 

    Hoffman J.; Jansson J.; de Abreu R.V. (19th AIAA/CEAS Aeroacoustics Conference, 2013-12-31)
    This is a summary of preliminary results from simulations with the 30P30N high-lift device. We used the General Galerkin finite element method (G2), where no explicit subgrid model is used, and where the computational mesh ...
  • Framework for adaptive fluid-structure interaction with industrial applications 

    Jansson J.; Degirmenci N.C.; Hoffman J. (International Journal of Materials Engineering Innovation, 2013-12-31)
    We present developments in the Unicorn-HPC framework for unified continuum mechanics, enabling adaptive finite element computation of fluid-structure interaction, and an overview of the larger FEniCS-HPC framework for ...
  • A two-level finite element discretization of the streamfunction formulation of the stationary quasi-geostrophic equations of the ocean 

    Foster E.L.; Iliescu T.; Wells D.R. (Computers and Mathematics with Applications, 2013-12-31)
    In this paper we proposed a two-level finite element discretization of the nonlinear stationary quasi-geostrophic equations, which model the wind driven large scale ocean circulation. Optimal error estimates for the two-level ...
  • 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 ...
  • 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 ...
  • A FEniCS-HPC framework for multi-compartment Bloch-Torrey models 

    Nguyen D.; Jansson J.; Hoffman J. (Proceesings of ECCOMAS Congress 2016 VII European Congress on Computational Methods in Applied Sciences and Engineering, 2016-11-30)
    In diffusion nuclear magnetic resonance (NMR) and diffusion magnetic resonance imaging (MRI), the multi-compartment Bloch-Torrey equation plays an important role in probing the diffusion characteristics from a nanometer ...
  • Direct FEM large scale computation of turbulent multiphase flow in urban water systems and marine energy 

    Krishnasamy E.; Hoffman J.; Jansson J. (Proceesings of ECCOMAS Congress 2016 VII European Congress on Computational Methods in Applied Sciences and Engineering, 2016-11-30)
    High-Reynolds number turbulent incompressible multiphase flow represents a large class of engineering problems of key relevance to society. Here we describe our work on modeling two such problems: 1. The Consorcio de Aguas ...
  • 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 ...
  • 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. ...
  • 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 ...
  • FEniCS-HPC: Automated predictive high-performance finite element computing with applications in aerodynamics 

    Hoffman J.; Jansson J.; Jansson N. (Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), 2016-01-01)
    Developing multiphysics finite element methods (FEM) and scalable HPC implementations can be very challenging in terms of software complexity and performance, even more so with the addition of goal-oriented adaptive mesh ...
  • Adaptive simulation of unsteady flow past the submerged part of a floating wind turbine platform 

    Jansson J.; Nava V.; Sanchez M.; Aguirre G.; de Abreu R.V.; Hoffman J.; Villate J.L. (MARINE 2015 - Computational Methods in Marine Engineering VI, 2015-12-31)
    Offshore floating platforms for wind turbines represent challenging concepts for designers trying to combine an optimal compromise between cost effectiveness and performance. Modelling of the hydrodynamic behaviour of the ...
  • Accelerating fluid-solid simulations (Lattice-Boltzmann & Immersed-Boundary) on heterogeneous architectures 

    Valero-Lara P.; Igual F.D.; Prieto-Matias M.; Pinelli A.; Favier J. (Journal of Computational Science, 2015-12-31)
    We propose a numerical approach based on the Lattice-Boltzmann (LBM) and Immersed Boundary (IB) methods to tackle the problem of the interaction of solids with an incompressible fluid flow, and its implementation on ...
  • 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 ...
  • Towards a parameter-free method for high Reynolds number turbulent flow simulation based on adaptive finite element approximation 

    Hoffman J.; Jansson J.; Jansson N.; de Abreu R.V. (Computer Methods in Applied Mechanics and Engineering, 2015-05-01)
    This article is a review of our work towards a parameter-free method for simulation of turbulent flow at high Reynolds numbers. In a series of papers we have developed a model for turbulent flow in the form of weak solutions ...
  • Introduction to the special issue on high performance computing solutions for complex problems 

    Lara P.V.; Pelayo F.L.; Jansson J. (Scalable Computing, 2016-01-01)
    [No abstract available]
  • Time-resolved adaptive FEM simulation of the DLR-F11 aircraft model at high Reynolds number 

    Hoffman J.; Jansson J.; Jansson N.; de Abreu R.V. (52nd AIAA Aerospace Sciences Meeting - AIAA Science and Technology Forum and Exposition, SciTech 2014, 2014-12-31)
    We present a time-resolved, adaptive finite element method for aerodynamics, together with the results from the HiLiftPW-2 workshop, where this method is used to compute the ow past a DLR-F11 aircraft model at realistic ...

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