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Low-Speed Turbulent Shear-Driven Mixing Layers with Large Thermal and Compositional Density Variations

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Modeling and Simulation of Turbulent Mixing and Reaction

Part of the book series: Heat and Mass Transfer ((HMT))

Abstract

Low speed shear-driven mixing layers involving fluid streams of different densities due to temperature or compositional variations are described by remarkably similar equations with some differences in the formulations of the molecular transport terms. These differences are related to specifics of the heat conduction and mass diffusion operators, as well as viscosity dependence on mixture molar mass and temperature in the low Mach number limit. Direct numerical simulations are performed in incompressible/low-speed limits to study the differences and similarities in mixing behavior associated with these configurations. The results demonstrate both subtle and significant changes in the mixing behavior for variable composition versus variable temperature mixing. Higher-order statistics related to density field reveal greater differences than are apparent from mean profiles; these differences can be extremely important when the physics is sensitive to mixing, such as in combustion problems. Therefore, conclusions regarding the mixing dynamics drawn from variable temperature mixing are not necessarily applicable to multi-species mixing.

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Acknowledgements

This work has been authored by employees of Triad National Security, LLC which operates Los Alamos National Laboratory under Contract No. 89233218CNA000001 with the U.S. Department of Energy/National Nuclear Security Administration.

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Authors and Affiliations

  1. Los Alamos National Laboratory, MS D413, Los Alamos, NM, 87545, USA

    Jon R. Baltzer & Daniel Livescu

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  1. Jon R. Baltzer
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  2. Daniel Livescu
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Correspondence to Daniel Livescu .

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Editors and Affiliations

  1. CCS-2, Computational Physics and Methods, Los Alamos National Laboratory, Los Alamos, NM, USA

    Daniel Livescu

  2. School of Engineering, University of Pittsburgh, Pittsburgh, USA

    Arash G. Nouri

  3. Mechanical and Aerospace Engineering, University at Buffalo, The State University of New York, Buffalo, NY, USA

    Francine Battaglia

  4. School of Engineering, University of Pittsburgh, Pittsburgh, PA, USA

    Peyman Givi

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Baltzer, J.R., Livescu, D. (2020). Low-Speed Turbulent Shear-Driven Mixing Layers with Large Thermal and Compositional Density Variations. In: Livescu, D., Nouri, A., Battaglia, F., Givi, P. (eds) Modeling and Simulation of Turbulent Mixing and Reaction. Heat and Mass Transfer. Springer, Singapore. https://doi.org/10.1007/978-981-15-2643-5_1

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  • DOI: https://doi.org/10.1007/978-981-15-2643-5_1

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  • Online ISBN: 978-981-15-2643-5

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