A Priori Direct Numerical Simulation Modelling of the Curvature Term of the Flame Surface Density Transport Equation for Nonunity Lewis Number Flames in the Context of Large Eddy Simulations
Joint Authors
Katragadda, Mohit
Chakraborty, Nilanjan
Source
International Journal of Chemical Engineering
Issue
Vol. 2012, Issue 2012 (31 Dec. 2012), pp.1-14, 14 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2012-08-15
Country of Publication
Egypt
No. of Pages
14
Main Subjects
Engineering Sciences and Information Technology
Abstract EN
A Direct Numerical Simulation (DNS) database of freely propagating statistically planar turbulent premixed flames with Lewis numbers Le ranging from 0.34 to 1.2 has been used to analyse the statistical behaviours of the curvature term of the generalised Flame surface Density (FSD) transport equation, in the context of the Large Eddy Simulation (LES).
Lewis number is shown to have significant influences on the statistical behaviours of the resolved and sub-grid parts of the FSD curvature term.
It has been found that the existing models for the sub-grid curvature term Csg do not capture the qualitative behaviour of this term extracted from the DNS database for flames with Le<<1.
The existing models of Csg only predict negative values, whereas the sub-grid curvature term is shown to assume positive values within the flame brush for the Le=0.34 and 0.6 flames.
Here the sub-grid curvature terms arising from combined reaction and normal diffusion and tangential diffusion components of displacement speed are individually modelled, and the new model of the sub-grid curvature term has been found to capture Csg extracted from DNS data satisfactorily for all the different Lewis number flames considered here for a wide range of filter widths.
American Psychological Association (APA)
Katragadda, Mohit& Chakraborty, Nilanjan. 2012. A Priori Direct Numerical Simulation Modelling of the Curvature Term of the Flame Surface Density Transport Equation for Nonunity Lewis Number Flames in the Context of Large Eddy Simulations. International Journal of Chemical Engineering،Vol. 2012, no. 2012, pp.1-14.
https://search.emarefa.net/detail/BIM-446603
Modern Language Association (MLA)
Katragadda, Mohit& Chakraborty, Nilanjan. A Priori Direct Numerical Simulation Modelling of the Curvature Term of the Flame Surface Density Transport Equation for Nonunity Lewis Number Flames in the Context of Large Eddy Simulations. International Journal of Chemical Engineering No. 2012 (2012), pp.1-14.
https://search.emarefa.net/detail/BIM-446603
American Medical Association (AMA)
Katragadda, Mohit& Chakraborty, Nilanjan. A Priori Direct Numerical Simulation Modelling of the Curvature Term of the Flame Surface Density Transport Equation for Nonunity Lewis Number Flames in the Context of Large Eddy Simulations. International Journal of Chemical Engineering. 2012. Vol. 2012, no. 2012, pp.1-14.
https://search.emarefa.net/detail/BIM-446603
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-446603