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Weekly Seminar: Fall 2008

Date: September 19

Time: 11:00 AM
Location: Maryland Hall 110
Speaker: Dr. Habib Najm
Sandia National Laboratory
Title:"Uncertainty Quantification in Chemical Systems"

Abstract

This talk will demonstrate the use of multiwavelet spectral polynomial chaos (PC) techniques for uncertainty quantification in ignition of a methane-air system at atmospheric pressure. Bayesian inference is employed for identifying the probabilistic representation of the uncertain parameters based on data. These random/uncertain parameters are represented using multiwavelet PC, and the uncertainty is propagated through the ignition process using both intrusive Galerkin projection and non-intrusive monte-carlo sampling methods. I analyze the time evolution of moments and probability density functions of the solution, and examine the role and significance of dependence among the uncertain parameters. I finish with a discussion of the role of nonlinearity and the performance of the algorithm.