Abstract
A storage/retrieval scheme-in situ adaptive tabulation (ISAT) [1]-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.
Original language | English (US) |
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DOIs | |
State | Published - Dec 1 2002 |
Event | Powertrain and Fluid Systems Conference and Exhibition - San Diego, CA, United States Duration: Oct 21 2002 → Oct 24 2002 |
Other
Other | Powertrain and Fluid Systems Conference and Exhibition |
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Country/Territory | United States |
City | San Diego, CA |
Period | 10/21/02 → 10/24/02 |
All Science Journal Classification (ASJC) codes
- Automotive Engineering
- Safety, Risk, Reliability and Quality
- Pollution
- Industrial and Manufacturing Engineering