A5007701222- Computational Fluid Dynamics and Aerodynamics
- Fluid Dynamics and Turbulent Flows
- Gas Dynamics and Kinetic Theory
- Advanced Numerical Methods in Computational Mathematics
- Simulation Techniques and Applications
- Numerical methods for differential equations
- Nuclear reactor physics and engineering
- Probabilistic and Robust Engineering Design
- Nuclear Engineering Thermal-Hydraulics
- Meteorological Phenomena and Simulations
- Fault Detection and Control Systems
- Lattice Boltzmann Simulation Studies
- Fluid Dynamics Simulations and Interactions
- Fluid Dynamics and Heat Transfer
- Matrix Theory and Algorithms
- Model Reduction and Neural Networks
- Laser-Plasma Interactions and Diagnostics
- Scientific Computing and Data Management
- Plasma and Flow Control in Aerodynamics
- Nuclear Physics and Applications
- Graphite, nuclear technology, radiation studies
- Numerical methods in inverse problems
- Particle Dynamics in Fluid Flows
- Wind and Air Flow Studies
- Advanced Data Processing Techniques
Sandia National Laboratories
2008-2024
University of L'Aquila
2021
Sandia National Laboratories California
2008-2019
National Nuclear Security Administration
2013
Los Alamos National Laboratory
1999-2009
Continuum Dynamics (United States)
2006
University of New Mexico
1990-2003
Computational Physics (United States)
1998-1999
University of California, Davis
1997
Analysis Group (United States)
1991
Solution algorithms are presented for tracking interfaces with piecewise linear (PLIC) volume-of-fluid (VOF) methods on fixed (Eulerian) two-dimensional (2-D) structured and three-dimensional (3-D) unstructured grids. We review the theory of volume methods, derive appropriate evolution equations, identify present solutions to basic geometric functions needed interface reconstruction fluxing, provide detailed algorithm templates modern 2-D 3-D PLIC VOF methods. discuss some key outstanding...
Abstract We present a rationale for the success of nonoscillatory finite volume (NFV) difference schemes in modelling turbulent flows without need subgrid scale models. Our exposition focuses on certain truncation terms that appear modified equation one particular NFV scheme, MPDATA. demonstrate these have physical justification, representing modifications to governing equations arise when considers motion volumes fluid over intervals time. Published 2002 by John Wiley & Sons, Ltd.
Implicit large eddy simulation (ILES) is a methodology for modeling high Reynolds' number flows that combine computational efficiency and ease of implementation with predictive calculations flexible application. Although ILES has been used more than 15 years, it only recently significant effort gone into providing physical rationale speaks to its capabilities limitations. In this article, we will present new theoretical results aimed toward building justification ILES. We also compare...
As noted in Wikipedia, skin the game refers to having ‘incurred risk by being involved achieving a goal’, where ‘ is synecdoche for person involved, and metaphor actions on field of play under discussion’. For exascale applications development US Department Energy Exascale Computing Project, nothing could be more apt, with delivering comprehensive science-based computational that effectively exploit high-performance computing technologies provide breakthrough modelling simulation data...
ALEGRA is an arbitrary Lagrangian-Eulerian (multiphysics) computer code developed at Sandia National Laboratories since 1990. The contains a variety of physics options including magnetics, radiation, and multimaterial flow. has been for nearly two decades, but recent work dramatically improved the code’s accuracy robustness. These improvements include techniques applied to basic Lagrangian differencing, artificial viscosity remap step method important improvement in conservation energy...
We study multigrid preconditioning of matrix-free Newton--Krylov methods as a means developing more efficient nonlinear iterative for large scale simulation. have proven dependable in solving systems while not requiring the explicit formation or storage complete Jacobian. However, standard algorithmic scaling Krylov is nonoptimal, with increasing linear system dimension. This motivates our use multigrid-based preconditioning. It demonstrated that simple preconditioner can effectively limit...
A number of advances in modeling multiphase incompressible flow are described. These include high-order Godunov projection methods, piecewise linear interface reconstruction and tracking the continuum surface force model. Examples given.
Summary In this paper, we take a different perspective on the derivation of artificial viscosity. Heretofore, development viscosity has been based paper published in Journal Applied Physics 1950 authored by John von Neumann and Robert Richtmyer [1]. Earlier, 1948, report at Los Alamos Scientific Laboratory documenting original concept [2]. This was true origin shock capturing methods contains several key ideas that are conceptually than journal article. Unfortunately, (LA‐671) classified...