Recent Submissions

  • 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 ...
  • Finite Element Simulations of Two-phase Flow and Floating Bodies Using FEniCS-HPC 

    Moragues M.; Castanon D.; Degirmeci N.C.; Jansson J.; Nava V.; Krishnasamy E.; Hoffman J. (13th World Congress in Computational Mechanics WCCM, New York, USA, 2018-07)
    We present a variational multiscale stabilized finite element method to solve the variable density incompressible Navier-Stokes equations for the simulation of two-phase flow. We introduce a level-set method based on the ...
  • Adaptive Direct FEM Simulation with Unicorn/FEniCS-HPC for CS1 

    Jansson J.; Krishnasamy E.; Leoni M. (5th International Workshop on High Order CFD Methods, 2018-01-01)
  • International energy agency ocean energy systems task 10 wave energy converter modeling verification and validation 

    Wendt F.F.; Yu Y.-H.; Nielsen K.; Ruehl K.; Bunnik T.; Touzon I.; Nam B.W.; Kim J.S.; Kim K.-H.; Janson C.E.; Jansson J. (Proceedings of European Wave and Tidal Energy Conference, 2017)
    This is the first joint reference paper for the Ocean Energy Systems (OES) Task 10 Wave Energy Converter modeling verification and validation group. The group is established under the OES Energy Technology Network program ...
  • A partition of unity finite element method for computational diffusion MRI 

    Nguyen V.D.; Jansson J.; Hoffman J.; Li J.R. (Journal of Computational Physics, 2018)
    The Bloch–Torrey equation describes the evolution of the spin (usually water proton) magnetization under the influence of applied magnetic field gradients and is commonly used in numerical simulations for diffusion MRI ...
  • Simulation of the HarshLab floating platform for offshore experimentation using FEniCS-HPC 

    Moragues M.; Castanon D.; Jansson J.; Nava V.; Krishnasamy E.; Degirmeci N.C.; Nguyen V.D.; Garrido C.; Sanchez M.; Rodriguez-Arias R. (Poster EUSKAMPUS IV Marine Energy Conference, 2017)
  • Direct finite element simulation of turbulent flow for marine based renewable energy 

    Jansson J.; Nguyen V.D.; Moragues M.; Castanon D.; Saavedra L.; Krishnasamy E.; Goude A.; Hoffman J. (Companion paper to F. Wendt, et. al. International energy agency ocean energy systems task 10 wave energy converter modeling verification and validation. In 12th European Wave and Tidal Energy Conference, 2017., 2017)
    In this article we present a computational framework for simulation of turbulent flow in marine based renewable energy applications. In particular, we focus on floating structures and rotating turbines. This work is an ...
  • Numerical simulation of the von Kármán sodium dynamo experiment 

    Nore C.; Castanon Quiroz D.; Cappanera L.; Guermond, L.J. (Journal of Fluid Mechanics, 2018-09-03)
    We present hydrodynamic and magnetohydrodynamic (MHD) simulations of liquid sodium flows in the von Kármán sodium (VKS) set-up. The counter-rotating impellers made of soft iron that were used in the successful 2006 experiment ...
  • Variational multiscale stabilization for compressible flow 

    Moragues Ginard M.; Vázquez M.; Houzeaux G. (Computer Methods in Applied Mechanics and Engineering, 2018)
    This paper presents a variational multiscale stabilization for the finite element numerical solution of the Euler and Navier-Stokes equations of compressible flow. All the components of the dual operator are considered in ...

    Kumar R.; Hoppe R.; Bhandari C. (Journal of Mathematical analysis and applications, 2017)
    We consider the numerical solution of a fourth order total variation flow problem representing surface relaxation below the roughening temperature. Based on a regularization and scaling of the nonlinear fourth order parabolic ...
  • 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 ...

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