Subgrid Reaction-Diffusion Closure for Large Eddy Simulations Using the Linear-Eddy Model
Journal article, 2019

Turbulent combustion models approximate the interaction between turbulence, molecular transport and chemical reactions. Among the many available turbulent combustion models, the present focus is the linear-eddy model (LEM) used as a subgrid combustion model for large eddy simulations. In particular this paper introduces a new LEM closure with the reaction-rate approach to close the filtered chemical source terms in the governing equations for species mass fractions and enthalpy. The new approach is tested using a non-premixed syngas flame and a bluff-body stabilized premixed flame problem. Simulation results are compared to data from a direct numerical simulation and experiments. This comparison shows that mean and rms quantities compare well with experiments and are in the range of previous simulation studies. These results are obtained with a pressure-based and unstructured computational-fluid-dynamics solver, an approach that is preferred in industry.

Linear-eddy model

Large eddy simulations

Reacting temporal jet


Bluff-body stabilized flame

Chemical source term closure

Turbulent combustion model


Salman Arshad

Chalmers, Mechanics and Maritime Sciences, Combustion

Esteban Gonzalez-Juez

Combustion Science and Engineering, Inc.

Adhiraj Dasgupta

Combustion Science and Engineering, Inc.

Suresh Menon

Georgia Institute of Technology

Michael Oevermann

Chalmers, Mechanics and Maritime Sciences, Combustion

Flow, Turbulence and Combustion

1386-6184 (ISSN) 1573-1987 (eISSN)

Vol. 103 2 389-416

Subject Categories

Applied Mechanics

Computational Mathematics

Fluid Mechanics and Acoustics



More information

Latest update