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

Jesse Capecelatro, Ramanathan Vishnampet, Daniel J. Bodony, Jonathan B. Freund

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A space-time discrete-adjoint method recently developed for high-fidelity 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-defined 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.

Original languageEnglish (US)
Title of host publication54th AIAA Aerospace Sciences Meeting
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624103933
DOIs
StatePublished - 2016
Event54th AIAA Aerospace Sciences Meeting, 2016 - San Diego, United States
Duration: Jan 4 2016Jan 8 2016

Publication series

Name54th AIAA Aerospace Sciences Meeting
Volume0

Other

Other54th AIAA Aerospace Sciences Meeting, 2016
CountryUnited States
CitySan Diego
Period1/4/161/8/16

ASJC Scopus subject areas

  • Aerospace Engineering

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    Capecelatro, J., Vishnampet, R., Bodony, D. J., & Freund, J. B. (2016). Adjoint-based sensitivity analysis of localized ignition in a non-premixed hydrogen—air mixing layer. In 54th AIAA Aerospace Sciences Meeting (54th AIAA Aerospace Sciences Meeting; Vol. 0). American Institute of Aeronautics and Astronautics Inc, AIAA. https://doi.org/10.2514/6.2016-2153