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Title: Adjoint-based sensitivity analysis of localized ignition in a non-premixed hydrogen-air mixing layer

Abstract

A space-time discrete-adjoint method recently developed for high- delity compressible turbulence simulations is extended to chemically-reacting mixtures for the purpose of measuring sensitivity of localized ignition in a non-premixed hydrogen-air mixing layer. The ignition source is modeled as a source in the energy equation, which introduces several parameters that need to be chosen with care. Because ignition is inherently discontinuous in parameter space (i.e., it succeeds or fails after some period), the resulting gradients in modeling parameters are ill-de ned near its threshold. To this end, a cost functional is designed to provide short-time sensitivity in concert with an indicator function that informs whether or not successful ignition has occurred. The corresponding sensitivity is used in a line-search algorithm to identify a point on the ignition boundary in high-dimensional parameter space (7 dimensional in our 7-parameter demonstration). This is used to quantify the relative importance of parameters on ignition.

Authors:
 [1];  [1];  [1];  [1]
  1. Univ. of Illinois at Urbana-Champaign, IL (United States). The Center for Exascale Simulation of Plasma-coupled Combustion (XPACC)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)
OSTI Identifier:
1567676
DOE Contract Number:  
NA0002374; AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: 54th AIAA Aerospace Sciences Meeting, 2016, San Diego, United States, Jan 4-8, 2016
Country of Publication:
United States
Language:
English

Citation Formats

Capecelatro, Jesse, Vishnampet, Ramanathan, Bodony, Daniel J., and Freund, Jonathan B. Adjoint-based sensitivity analysis of localized ignition in a non-premixed hydrogen-air mixing layer. United States: N. p., 2016. Web. doi:10.2514/6.2016-2153.
Capecelatro, Jesse, Vishnampet, Ramanathan, Bodony, Daniel J., & Freund, Jonathan B. Adjoint-based sensitivity analysis of localized ignition in a non-premixed hydrogen-air mixing layer. United States. doi:10.2514/6.2016-2153.
Capecelatro, Jesse, Vishnampet, Ramanathan, Bodony, Daniel J., and Freund, Jonathan B. Sat . "Adjoint-based sensitivity analysis of localized ignition in a non-premixed hydrogen-air mixing layer". United States. doi:10.2514/6.2016-2153.
@article{osti_1567676,
title = {Adjoint-based sensitivity analysis of localized ignition in a non-premixed hydrogen-air mixing layer},
author = {Capecelatro, Jesse and Vishnampet, Ramanathan and Bodony, Daniel J. and Freund, Jonathan B.},
abstractNote = {A space-time discrete-adjoint method recently developed for high- delity compressible turbulence simulations is extended to chemically-reacting mixtures for the purpose of measuring sensitivity of localized ignition in a non-premixed hydrogen-air mixing layer. The ignition source is modeled as a source in the energy equation, which introduces several parameters that need to be chosen with care. Because ignition is inherently discontinuous in parameter space (i.e., it succeeds or fails after some period), the resulting gradients in modeling parameters are ill-de ned near its threshold. To this end, a cost functional is designed to provide short-time sensitivity in concert with an indicator function that informs whether or not successful ignition has occurred. The corresponding sensitivity is used in a line-search algorithm to identify a point on the ignition boundary in high-dimensional parameter space (7 dimensional in our 7-parameter demonstration). This is used to quantify the relative importance of parameters on ignition.},
doi = {10.2514/6.2016-2153},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2016},
month = {1}
}

Conference:
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