CSAR Seminar
SPEAKER: Habib Najm, Sandia National Laboratories
TITLE:
Uncertainty Quantification in Reacting Flow Modeling
DATE: Tuesday, June 13, 2006
TIME: 12:00 Noon
PLACE: 2240 DCL
1304 W. Springfield Ave., Urbana, IL
ABSTRACT
Uncertainty Quantification (UQ) in computational models is necessary
for design and optimization of engineering systems. It is also useful
from a scientific point of view, where model validation with respect to
experimental measurements requires careful measures of uncertainty in
both experimental data and computational predictions. This talk will
focus on the use of stochastic spectral techniques, using Polynomial
Chaos (PC) expansions, for uncertainty quantification in reacting flow
models. Both intrusive PC UQ constructions relying on Galerkin
projection, and non-intrusive sampling-based PC methods, will be
discussed. The methods will be applied in the context of homogeneous
ignition and one-dimensional flames. Challenges with the
implementation of both techniques will be discussed, highlighting the
role of non-linearities and the consequences of high-dimensional
parametric spaces.