Chemical and vibrational non-equilibrium effects on turbulence are studied using DNS. Such effects are typically observed in very high Mach number flows. Decaying isotropic turbulence is chosen as a model problem to study the physics underlying these non-equilibrium/turbulence interactions. A hybrid higher order finite difference based flow solver is developed for this purpose. A 5-species model for air is implemented. Turbulence/non-equilibrium interactions are studied for two different initial mean temperatures. Effects on both the mean flow and the turbulence are presented. © 2019 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

Shankar Ghosh

Department of Aerospace Engineering

Aviation

Mach number

ENTHALPY EFFECTS

HIGH MACH NUMBER

HIGHER ORDER FINITE DIFFERENCES

isotropic turbulence

Mean temperature

MODEL PROBLEMS

Non equilibrium

Non-equilibrium effects

Turbulence

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

DNS of High-Enthalpy Effects on Turbulent Flows

AIAA Scitech 2019 Forum

High temperature effects on homogeneous decaying isotropic turbulence are studied using Direct Numerical Simulations (DNS). A Fourier-spectral compressible flow solver is developed for the purpose. To account for the high temperature effects, a local thermodynamic equilibrium based physical model for air is suggested. At high temperatures, both thermodynamic and transport properties of air are found to be significantly different from those predicted using a calorically perfect gas model. The effects of these properties on evolution of turbulent statistics are studied and comparisons are made with a calorically perfect gas model. Budgets are computed for turbulent kinetic energy and enstrophy to explain the results obtained using the high temperature model. © 2017 by Gokul Ramanathan, Shankar Ghosh.

AIAA SciTech Forum - 55th AIAA Aerospace Sciences Meeting

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45th AIAA Fluid Dynamics Conference

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7th AIAA Theoretical Fluid Mechanics Conference

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Journal	Data powered by TypesetAIAA Scitech 2019 Forum
Publisher	Data powered by TypesetAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISSN	0001-1452
Impact Factor	1.868
Open Access	No
Citation Style	unsrt
Sherpa RoMEO Archiving Policy	Green