Progress in the Prediction of Entropy Generation in Turbulent Reacting Flows Using Large Eddy Simulation

Entropy

Mehdi Safari¹  Fatemeh Hadi² 

[1] Department of Mechanical and Industrial Engineering, Northeastern University, Boston, MA 02115, USA;

关键词: entropy generation;    large eddy simulation;    filtered density function;    turbulent reacting flows;   

DOI  :  10.3390/e16105159

来源: mdpi

【 摘 要 】

An overview is presented of the recent developments in the application of large eddy simulation (LES) for prediction and analysis of local entropy generation in turbulent reacting flows. A challenging issue in such LES is subgrid-scale (SGS) modeling of filtered entropy generation terms. An effective closure strategy, recently developed, is based on the filtered density function (FDF) methodology with inclusion of entropy variations. This methodology, titled entropy FDF (En-FDF), is the main focus of this article. The En-FDF has been introduced as the joint velocity-scalar-turbulent frequency-entropy FDF and the marginal scalar-entropy FDF. Both formulations contain the chemical reaction and its entropy generation effects in closed forms. The former constitutes the most comprehensive form of the En-FDF and provides closure for all of the unclosed terms in LES transport equations. The latter is the marginal En-FDF and accounts for entropy generation effects, as well as scalar-entropy statistics. The En-FDF methodologies are described, and some of their recent predictions of entropy statistics and entropy generation in turbulent shear flows are presented.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland