Implementation of Detailed Chemical Mechanisms into Multidimensional CFD Using in situ Adaptive Tabulation: Application to HCCI Engines 2002-01-2773
A storage/retrieval scheme - in situ adaptive tabulation (ISAT)  - is used to implement detailed chemistry in a multidimensional engine CFD code. The emphasis is on predicting autoignition in nearly homogeneous and moderately non-homogeneous mixtures (HCCI); preliminary results for highly non-homogeneous direct-injection autoignition also are reported. Speedups approaching a factor of 100 have been realized with ISAT compared to direct integration of the chemical source terms; factors of five-to-ten are more readily obtainable. In the standard ISAT method, table size increases as the square of the number of chemical species in the reaction mechanism; here linear scaling is achieved by limiting the set of independent tabulation variables, while still retaining the full chemical mechanism. A key to effective use of storage/retrieval is judicious specification of the control parameters; guidelines for parameter specification are presented. With this approach, it becomes feasible to use chemical mechanisms involving over 100 species for moderately non-homogeneous systems. Further investigation is required for highly non-homogeneous systems.
Citation: Embouazza, M., Haworth, D., and Darabiha, N., "Implementation of Detailed Chemical Mechanisms into Multidimensional CFD Using in situ Adaptive Tabulation: Application to HCCI Engines," SAE Technical Paper 2002-01-2773, 2002, https://doi.org/10.4271/2002-01-2773. Download Citation
M. Embouazza, D. C. Haworth, N. Darabiha
PSA Peugeot Citroën Automobiles, The Pennsylvania State University, Ecole Centrale Paris
SAE Powertrain & Fluid Systems Conference & Exhibition
Spark Ignition and Compression Ignition Engine Modeling-SP-1720, SAE 2002 Transactions Journal of Fuels and Lubricants-V111-4