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Journal of Combustion
Volume 2014, Article ID 484372, 7 pages
http://dx.doi.org/10.1155/2014/484372
Research Article

Nonpremixed Counterflow Flames: Scaling Rules for Batch Simulations

Lehrstuhls für Thermodynamik, Technische Universität München, Boltzmannstraße 15, 85747 Garching, Germany

Received 26 March 2014; Accepted 2 June 2014; Published 22 June 2014

Academic Editor: Constantine D. Rakopoulos

Copyright © 2014 Thomas Fiala and Thomas Sattelmayer. 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 method is presented to significantly improve the convergence behavior of batch nonpremixed counterflow flame simulations with finite-rate chemistry. The method is applicable to simulations with varying pressure or strain rate, as it is, for example, necessary for the creation of flamelet tables or the computation of the extinction point. The improvement is achieved by estimating the solution beforehand. The underlying scaling rules are derived from theory, literature, and empirical observations. The estimate is used as an initialization for the actual solver. This enhancement leads to a significantly improved robustness and acceleration of batch simulations. The extinction point can be simulated without cumbersome code extensions. The method is demonstrated on two test cases and the impact is discussed.