Browsing CFD Computational Technology by Issue Date
Now showing items 21-40 of 40
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Simulation of the HarshLab floating platform for offshore experimentation using FEniCS-HPC
Moragues, M.
; Castanon, D.; Jansson, J.; Nava, V.; Krishnasamy, E.; Degirmenci, N.C.; Nguyen, V.D.; Garrido, C.; Sanchez, M.; Rodriguez-Arias, R. (2017)
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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. (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 ... -
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 ... -
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 ... -
Time-resolved Adaptive Direct FEM Simulation of High-lift Aircraft Configurations
Jansson, J.; Krishnasamy, E.; Leoni, M.; Jansson, N.; Hoffman, J. (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 ... -
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 ... -
Variational multiscale stabilization for compressible flow
Moragues, M.; Vázquez, M.; Houzeaux, G. (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 ... -
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 ... -
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 ... -
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 ... -
Control of distributed parameter systems modelled by parabolic variational inequalities of the obstacle type
(2019)We will investigate the numerical solution of the control problem modelled by parabolic variational inequalities. The general point of view adopted in this work has its roots in the work by R. Glowinski. The optimal control ... -
Computability and Adaptivity in CFD
Hoffman, J.; Jansson, J.; Jansson, N.; Vilela De Abreu, R.; Johnson, C. (2019)
We give a brief introduction to research on adaptive computational methods for laminar compressible and incompressible flow, and then focus on computability and adaptivity for turbulent incompressible flow, where we present ... -
A C0 interior penalty discontinuous Galerkin method for fourth‐order total variation flow I: Derivation of the method and numerical results
(2019-02-23)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 ... -
A C 0 interior penalty discontinuous Galerkin Method for fourth-order total variation flow. II: Existence and uniqueness
(2019-02-25)We prove the existence and uniqueness of a solution of a C0 Interior Penalty Discontinuous Galerkin (C0 IPDG) method for the numerical solution of a fourth‐order total variation flow problem that has been developed in part ... -
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 ... -
Direct FEM computation of turbulent multiphase flow in 3D priting nozzle design
(2020)In this paper, we present a nozzle design of the 3D printing using FEniCS-HPC as mathematical and simulation tool. In recent years 3D printing or Additive Manufacturing (AM) has become a emerging technology and it has ... -
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 ... -
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 ... -
Aeroacoustic Analysis of a Subsonic Jet using the Discontinuous Galerkin Method
Lindblad, D.; Sherwin, S.; Cantwell, C.; Lawrence, J.; Proença, A.; Moragues, M. (2022)
In this work, the open-source spectral/hp element framework Nektar++ (www.nektar.info) is coupled with the Antares library (www.cerfacs.fr/antares/) to predict noise from a subsonic jet. Nektar++ uses the high-order ...