Title

Large Eddy Simulation of Entropy Generation in a Turbulent Mixing Layer

Document Type

Conference Proceeding

Publication Date

2013

Abstract

Entropy transport equation is considered in large eddy simulation (LES) of turbulent flows. The irreversible entropy generation in this equation provides a more general description of subgrid scale (SGS) dissipation due to heat conduction, mass diffusion and viscosity effects. A new methodology is developed, termed the entropy filtered density function (En-FDF), to account for all individual entropy generation effects in turbulent flows. The En-FDF represents the joint probability density function of entropy, frequency, velocity and scalar fields within the SGS. An exact transport equation is developed for the En-FDF, which is modeled by a system of stochastic differential equations, incorporating the second law of thermodynamics. The modeled En-FDF transport equation is solved by a Lagrangian Monte Carlo method. The methodology is employed to simulate a turbulent mixing layer involving transport of passive scalars and entropy. Various modes of entropy generation are obtained from the En-FDF and analyzed. Predictions are assessed against data generated by direct numerical simulation (DNS). The En-FDF predictions are in good agreements with the DNS data.

Comments

© 2013 American Physical Society | All rights reserved

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Publication Title

Bulletin of the American Physical Society, 66th Annual Meeting of the APS Division of Fluid Dynamics

Published Citation

Sheikhi, M.R.H., Safari, M. and Hadi, F. "Large Eddy Simulation of Entropy Generation in a Turbulent Mixing Layer," Bulletin of the American Physical Society, 66th Annual Meeting of the APS Division of Fluid Dynamics, Vol. 58, No. 18, Pittsburgh, PA, November 24-26, 2013.