Implementation of Detailed Chemical Mechanisms into Multidimensional CFD Using in situ Adaptive Tabulation: Application to HCCI Engines PSA Peugeot Citroën Automobiles

Format:

Conference/Event

Author/Creator:

Embouazza, M., author.

Conference Name:

SAE Powertrain & Fluid Systems Conference & Exhibition (2002-10-21 : San Diego, California, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2002

Summary:

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

Notes:

Vendor supplied data

Publisher Number:

2002-01-2773

Access Restriction:

Restricted for use by site license