scholarly journals Entropy Transport Equation in Large Eddy Simulation for Exergy Analysis of Turbulent Combustion Systems

Entropy ◽  
2010 ◽  
Vol 12 (3) ◽  
pp. 434-444 ◽  
Author(s):  
Mehdi Safari ◽  
M. Reza H. Sheikhi ◽  
Mohammad Janbozorgi ◽  
Hameed Metghalchi
Keyword(s):  
Large Eddy Simulation ◽  
Transport Equation ◽  
Turbulent Combustion ◽  
Exergy Analysis ◽  
Eddy Simulation ◽  
Entropy Transport ◽  
Large Eddy ◽  
Combustion Systems

Analysis of Local Entropy Generation via Large Eddy Simulation of Turbulent Flows

2010 ◽  
Author(s):  
M. Reza H. Sheikhi ◽  
Mehdi Safari ◽  
Hameed Metghalchi
Keyword(s):  
Large Eddy Simulation ◽  
Transport Equation ◽  
Turbulent Flows ◽  
Entropy Generation ◽  
Local Entropy ◽  
Filtered Density Function ◽  
Eddy Simulation ◽  
Entropy Transport ◽  
Large Eddy ◽  
Local Entropy Generation

A novel methodology is developed for local entropy generation analysis of turbulent flows using large eddy simulation (LES). The entropy transport equation is introduced in LES. The filtered form of this equation includes the unclosed subgrid scale entropy generation effects. The closure is based on the filtered density function (FDF) methodology, extended to include the transport of entropy. An exact transport equation is derived for the FDF. The unclosed terms in this equation is modeled by considering a system of stochastic differential equations. LES/FDF is employed to simulate a turbulent shear layer involving transport of mass, energy and entropy. The local entropy generation effects are obtained from the FDF and analyzed. It is shown that the dominant contribution to entropy generation in this flow is due to the combined effects of energy transfer by heat interaction and mass diffusion.

Large Eddy Simulation for Local Entropy Generation Analysis of Turbulent Flows

2012 ◽  
Vol 134 (4) ◽  
Author(s):  
M. R. H. Sheikhi ◽  
Mehdi Safari ◽  
Hameed Metghalchi
Keyword(s):  
Large Eddy Simulation ◽  
Transport Equation ◽  
Turbulent Flows ◽  
Entropy Generation ◽  
Local Entropy ◽  
Filtered Density Function ◽  
Eddy Simulation ◽  
Entropy Transport ◽  
Large Eddy ◽  
Local Entropy Generation

A new methodology is developed for local entropy generation analysis of turbulent flows using large eddy simulation (LES). The entropy transport equation is considered in LES and is solved along with continuity, momentum, and scalar transport equations. The filtered entropy equation includes several unclosed source terms that contribute to entropy generation. The closure is based on the filtered density function (FDF) methodology, extended to include the transport of entropy. An exact transport equation is derived for the FDF. The unclosed terms in this equation are modeled by considering a system of stochastic differential equations (SDEs). The methodology is employed for LES of a turbulent shear layer involving transport of passive chemical species, energy, and entropy. The local entropy generation effects are obtained from the FDF and are analyzed. It is shown that the dominant contribution to entropy generation in this flow is due to combined effects of energy transfer by heat and mass diffusion. The FDF results are assessed by comparing with those obtained by direct numerical simulation (DNS) of the same layer. The FDF predictions show favorable agreements with the DNS data.

Toward Validation of Large Eddy Simulation for Turbulent Combustion

AIAA Journal ◽  
2006 ◽  
Vol 44 (3) ◽  
pp. 418-433 ◽  
Author(s):  
Joseph C. Oefelein ◽  
Robert W. Schefer ◽  
Robert S. Barlow
Keyword(s):  
Large Eddy Simulation ◽  
Turbulent Combustion ◽  
Eddy Simulation ◽  
Large Eddy
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