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LES of Reacting Mixing Layers: Species Concentration Boundedness and Inflow Conditions

Kartha, Anand and Subbareddy, Pramod K. and Candler, Graham V. and Dimotakis, Paul (2015) LES of Reacting Mixing Layers: Species Concentration Boundedness and Inflow Conditions. In: 45th AIAA Fluid Dynamics Conference. American Institute of Aeronautics and Astronautics , Reston, VA, pp. 1-15. ISBN 978-1-62410-366-7. https://resolver.caltech.edu/CaltechAUTHORS:20181022-132704070

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Abstract

The present work carries out large-eddy simulations of the low-speed, high-Reynolds number, chemically-reacting mixing layer experiments by Slessor et. al. In particular, we study the low-heat release case with prescribed turbulent inflow conditions. The objective of the present work is to gain insight into the physics of the reacting shear layer and to address some associated computational challenges. This set of experiments are at subsonic conditions and use hydrogen and fluorine as the fuel and oxidizer, respectively. The hypergolic reaction between H_2 and F_2, as it was run in the Slessor et al. experiments, is characterized by a large Damköhler number, making the chemistry fast compared to the flow time scales: the product formation and temperature-rise in the flow is mixing-limited. In this work, we attempt to address the issue of overshoots and undershoots of species mass-frictions, often observed in LES of high-Reynolds number flows, by modifying the convective fluxes. We observe that the modified fluxes eliminate the global excursions of species mass-fraction concentration. A three dimensional simulation is performed by imposing synthetic turbulence at the inflow, generated using the digital filter approach of Klein et al., to mimic the experimental flow conditions. The velocity profiles, growth rate, and product thickness obtained from the simulations show a good match with the experimental data, but the peak value of temperature-rise is slightly over predicted.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.2514/6.2015-3207DOIArticle
Additional Information:© 2015 American Institute of Aeronautics and Astronautics. This work was sponsored by the Air Force Office of Scientific Research under grants FA9550-12-1-0064 and FA9550-12-1-0461 and the Department of Energy. The views and conclusions contained herein are those of the author and should not be interpreted as necessarily representing the official policies or endorsements, either expressed or implied, of the AFOSR or the U.S. Government. This work was carried out in part using computing resources at the University of Minnesota Supercomputing Institute. We would also like to thank Sidharth G.S., Joesph Brock, Ross Choudary and Derek Dinzl for constructive discussions during the work.
Group:GALCIT
Funders:
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)FA9550-12-1-0064
Air Force Office of Scientific Research (AFOSR)FA9550-12-1-0461
Department of Energy (DOE)UNSPECIFIED
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AIAA Paper2015-3207
Record Number:CaltechAUTHORS:20181022-132704070
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20181022-132704070
Official Citation:LES of Reacting Mixing Layers: Species Concentration Boundedness and Inflow Conditions. Anand Kartha, Pramod K. Subbareddy, Graham V. Candler, and Paul Dimotakis. 22nd AIAA Computational Fluid Dynamics Conference. Dallas, TX.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:90328
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:22 Oct 2018 21:20
Last Modified:03 Oct 2019 20:24

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