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Multidimensional Modeling of Advanced Diesel Combustion System by Parallel Chemistry
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 11, 2005 by SAE International in United States
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In the present paper the combustion process in a modern second generation Common Rail Diesel engine for light duty application is experimentally and numerically investigated. An improved version of the KIVA3V-Release 2 code was used for the simulations.
To model the combustion process, a detailed kinetic scheme involving 57 species and 290 equations, based on the n-heptane combustion, was used, interfacing the KIVA3V code with the CHEMKIN-II chemistry package. The full set of equations is concurrently solved in each computational cell by different solvers with the final aim of obtaining a locally adaptative code: local choices are undertaken in terms of time steps as well as in terms of the employed solvers. To reduce computational time, the code was parallelized: this parallelization is mainly focused on the chemical subroutines, considering that they are responsible for more than the 95% of the computing. Due to the spatial in-homogeneous characteristics of diesel combustion, the grid partitioning is a key point for efficient computation. Therefore, different grid partitioning criteria were used and analyzed in terms of “divide and conquer” advantages and load balancing issues. The performance analysis suggests that a random partitioning criterion is useful to smooth the grid in-homogeneities over the processes.
CitationBelardini, P., Bertoli, C., Corsaro, S., and D'Ambra, P., "Multidimensional Modeling of Advanced Diesel Combustion System by Parallel Chemistry," SAE Technical Paper 2005-01-0201, 2005, https://doi.org/10.4271/2005-01-0201.
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