Publications
Showing 130 results for Author: Srdjan Simunovic
Oct, 2009
ORNL Report
Modeling of Gap Closure in Uranium-Zirconium Alloy Metal Fuel – A Test Problem
Sep, 2009
Journal
Wavelet-based Spatiotemporal Multi-scaling in Diffusion Problems with Chemically Reactive Boundary
Chemically reacting flows over catalytic and non-catalytic surfaces are one of the elementary operations in chemical processing plants. The underlying physical phenomena span time- and length-scales over several orders of magnitude, for which a robust and flexible modeling framework must efficiently account for. With this purpose as the eventual goal, we propose a wavelet-…
Sep, 2009
Journal
Wavelet-Based Spatial Scaling of Coupled Reaction-Diffusion Fields
Multiscale schemes for transferring information from fine to coarse scales are typically based on homogenization techniques. Such schemes smooth the fine scale features of the underlying fields, often resulting in the inability to accurately retain the fine scale correlations. In addition, higher-order statistical moments (beyond mean) of the relevant field variables are n…
Nov, 2008
Conference Paper
Algorithmic/Simulation Opportunities in Modeling of Nuclear Fuel Rods
Improved nuclear fuel is the primary technology required for the realization of advanced nuclear reactor technologies. Central to the development of fuel with enhanced reliability and accident performance, extended burn up, ease of fabrication and reprocessing is the need to develop a fundamental understanding of the nuclear fuel elements and materials involved. Modeling t…
Nov, 2006
Journal
Crack Surface Roughness in Three-Dimensional Random Fuse Networks
Using large system sizes with extensive statistical sampling, we analyze the scaling properties of crack roughness and damage profiles in the three-dimensional random fuse model. The analysis of damage profiles indicates that damage accumulates in a diffusive manner up to the peak load, and localization sets in abruptly at the peak load starting from a uniform damage lands…
Nov, 2006
Journal
Crack Cluster Distributions in Random Fuse Model
Using large-scale numerical simulations and extensive sampling, we analyze the scaling properties of crack cluster distribution and the largest crack cluster distribution at the peak load. The simulations are performed using both two-dimensional and three-dimensional random fuse models. The numerical results indicate that in contrast with the randomly diluted networks (per…
Nov, 2006
Conference Paper
Computational challenges in the large-scale simulations of fracture in disordered media
Computational modeling of fracture in disordered materials using discrete lattice models is often limited to small system sizes due to high computational cost associated with re-solving the governing system of equations every time a new lattice bond is broken. Previously, we proposed an efficient algorithm based on multiple-rank sparse Cholesky downdating scheme for 2D sim…
Nov, 2006
Conference Paper
Fracture in Three-Dimensional Random Fuse Model: Recent Advances Through High-Performance Computing
The paper presents the state-of-the-art algorithmic developments for simulating the fracture of disordered quasi-brittle materials using discrete lattice systems. Large scale simulations are often required to obtain accurate scaling laws; however, due to computational complexity, the simulations using the traditional algorithms were limited to small system sizes. In our ea…