Propagation of kinetic uncertainty through surrogate subspace in combustion simulations

Weiqi Ji, Jiaxing Wang, Bin Yang, Zhuyin Ren, Chung K. Law

Research output: Contribution to conferencePaper

Abstract

In combustion simulations with uncertainty quantification, a large number of samples from the high-dimensional uncertainty parameter space are needed to propagate the kinetic uncertainty to global combustion characteristics such as the ignition delay time. Recognizing that it is computationally challenging to perform so many individual turbulent combustion simulations, a novel approach is proposed to propagate the kinetic uncertainty through a low-rank surrogate subspace as a replacement for the entire parameter space to reproduce the uncertainty on the target quantity. Specifically, the original parameter uncertainty hypercube is projected onto the surrogate subspace via a transform matrix, which is optimized using the generic algorithm, such that the projected samples in the surrogate subspace can reproduce the uncertainty of the target. We demonstrate the constructions of the surrogate subspaces for a detailed hydrogen mechanism, in which artificial neural network is employed as the response surface to accelerate the uncertainty propagate from the reaction rates to the target quantity. Then the probability distribution function of the above quantities is specified as the objective functions for the optimization. The surrogate subspace is optimized by specifying the ignition delay time, laminar flame speed and the extinction time in perfect stirred reactor as the target quantities, and is validated against the extinction strain rate in counterflow diffusion flame.

Original languageEnglish (US)
StatePublished - Jan 1 2017
Event10th U.S. National Combustion Meeting - College Park, United States
Duration: Apr 23 2017Apr 26 2017

Other

Other10th U.S. National Combustion Meeting
CountryUnited States
CityCollege Park
Period4/23/174/26/17

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Physical and Theoretical Chemistry
  • Mechanical Engineering

Keywords

  • Artificial Neural Network
  • Surrogate Subspace
  • Turbulent Combustion
  • Uncertainty Propagation

Fingerprint Dive into the research topics of 'Propagation of kinetic uncertainty through surrogate subspace in combustion simulations'. Together they form a unique fingerprint.

  • Cite this

    Ji, W., Wang, J., Yang, B., Ren, Z., & Law, C. K. (2017). Propagation of kinetic uncertainty through surrogate subspace in combustion simulations. Paper presented at 10th U.S. National Combustion Meeting, College Park, United States.