Browsing CFD Computational Technology by Title
Now showing items 13-32 of 40
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A FEniCS-HPC framework for multi-compartment Bloch-Torrey models
Nguyen, D.; Jansson, J.; Hoffman, J.
(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 ... -
FEniCS-HPC: Automated predictive high-performance finite element computing with applications in aerodynamics
Hoffman, J.; Jansson, J.; Jansson, N. (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 ... -
Finite Element Simulations of Two-phase Flow and Floating Bodies Using FEniCS-HPC
Moragues, M.; Castanon, D.; Degirmenci, N.C.; Jansson, J.; Nava, V.; Krishnasamy, E.; Hoffman, J. (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 ... -
Finite Element simulations: computations and applications to aerodynamics and biomedicine
(2020-12-11)Partial Differential Equations describe a large number of phenomena of practical interest and their solution usually requires running huge simulations on supercomputing clusters. Especially when dealing with turbulent ... -
Framework for adaptive fluid-structure interaction with industrial applications
Jansson, J.; Degirmenci, N.C.; Hoffman, J. (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 ... -
High Performance Scientific Computing in Applications with Direct Finite Element Simulation
(2020-06-18)To predict separated flow including stall of a full aircraft with Computational Fluid Dynamics (CFD) is considered one of the problems of the grand challenges to be solved by 2030, according to NASA [1]. The nonlinear ... -
International energy agency ocean energy systems task 10 wave energy converter modeling verification and validation
(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 ... -
Introduction to the special issue on high performance computing solutions for complex problems
(2016-01-01)[No abstract available] -
LBM-HPC - An open-source tool for fluid simulations. Case study: Unified parallel C (UPC-PGAS)
(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
(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 ... -
Leveraging the Performance of LBM-HPC for Large Sizes on GPUs using Ghost Cells
(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 ... -
Many-task computing on many-core architectures
(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 ... -
Multi-domain grid refinement for lattice-Boltzmann simulations on heterogeneous platforms
(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 ... -
Multipreconditioned GMRES for Shifted Systems
(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 ... -
New Theory of Flight
Hoffman, J.; Jansson, J.; Claes, J. (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. ... -
A Non-uniform Staggered Cartesian Grid approach for Lattice-Boltzmann method
(2015-12-31)We propose a numerical approach based on the Lattice-Boltzmann method (LBM) for dealing with mesh refinement of Non-uniform Staggered Cartesian Grid. We explain, in detail, the strategy for mapping LBM over such geometries. ... -
Nonlinear computations of heave motions for a generic Wave Energy Converter
Janson, C.E.; Shiri, A.; Jansson, J.; Moragues, M.; Castanon, D.; Saavedra, L.; Degirmenci, N.C.; Leoni, M. (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 ... -
Numerical simulation of the von Kármán sodium dynamo experiment
(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 ... -
A partition of unity finite element method for computational diffusion MRI
Nguyen, V.D.; Jansson, J.; Hoffman, J.; Li, J.R. (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 ... -
Portable simulation framework for diffusion MRI
Nguyen, V.D.; Leoni, M.; Dancheva, T.; Jansson, J.; Hoffman, J.; Wassermann, D.; Li, J.R. (2019-09-23)
The numerical simulation of the diffusion MRI signal arising from complex tissue micro-structures is helpful for understanding and interpreting imaging data as well as for designing and optimizing MRI sequences. The ...