Modelling of the Curvature Term of the Flame Surface Density Transport Equation for Large Eddy SimulationsReport as inadecuate




Modelling of the Curvature Term of the Flame Surface Density Transport Equation for Large Eddy Simulations - Download this document for free, or read online. Document in PDF available to download.

Journal of CombustionVolume 2012 2012, Article ID 915482, 12 pages

Research ArticleSchool of Mechanical and Systems Engineering, Newcastle University, Claremont Road, Newcastle upon Tyne NE1 7RU, UK

Received 27 June 2012; Accepted 19 September 2012

Academic Editor: Essam Eldin Khalil

Copyright © 2012 Mohit Katragadda and Nilanjan Chakraborty. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A simplified chemistry based three-dimensional Direct Numerical Simulation DNS database of freely propagating statistically planar turbulent premixed flames with a range of different values of turbulent Reynolds number has been used for the a priori modelling of the curvature term of the generalised Flame Surface Density FSD transport equation in the context of Large Eddy Simulation LES. The curvature term has been split into the contributions arising due to the reaction and normal diffusion components of displacement speed and the term originating from the tangential diffusion component of displacement speed. Subsequently, these contributions of the curvature term have been split into the resolved and subgrid contributions. New models have been proposed for the subgrid curvature terms arising from the combined reaction and normal diffusion components and the tangential diffusion component of displacement speed. The performances of the new model and the existing models for the subgrid curvature term have been compared with the corresponding quantity extracted from the explicitly filtered DNS data. The new model for the subgrid curvature term is shown to perform satisfactorily in all cases considered in the current study, accounting for wide variations in LES filter size.





Author: Mohit Katragadda and Nilanjan Chakraborty

Source: https://www.hindawi.com/



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