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Journal of Combustion
Volume 2010, Article ID 201780, 12 pages
http://dx.doi.org/10.1155/2010/201780
Research Article

A Two-Zone Multigrid Model for SI Engine Combustion Simulation Using Detailed Chemistry

1Engine Research Center, University of Wisconsin-Madison, Madison, WI 53706, USA
2Wisconsin Engine Research Consultants, LLC, 3983 Plymouth Dr., Madison, WI 53705, USA

Received 26 December 2009; Revised 19 May 2010; Accepted 14 June 2010

Academic Editor: Ishwar Puri

Copyright © 2010 Hai-Wen Ge et al. 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

An efficient multigrid (MG) model was implemented for spark-ignited (SI) engine combustion modeling using detailed chemistry. The model is designed to be coupled with a level-set-G-equation model for flame propagation (GAMUT combustion model) for highly efficient engine simulation. The model was explored for a gasoline direct-injection SI engine with knocking combustion. The numerical results using the MG model were compared with the results of the original GAMUT combustion model. A simpler one-zone MG model was found to be unable to reproduce the results of the original GAMUT model. However, a two-zone MG model, which treats the burned and unburned regions separately, was found to provide much better accuracy and efficiency than the one-zone MG model. Without loss in accuracy, an order of magnitude speedup was achieved in terms of CPU and wall times. To reproduce the results of the original GAMUT combustion model, either a low searching level or a procedure to exclude high-temperature computational cells from the grouping should be applied to the unburned region, which was found to be more sensitive to the combustion model details.