Assessment of a transient homogeneous reactor through in situ adaptive tabulationReport as inadecuate

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1 Pontifícia Universidade Católica do Rio de Janeiro PUC-Rio

Abstract : The development of computational models for the numerical simulation of chemically reacting flows operating in the turbulent regime requires the solution of partial differential equations that represent the balance of mass, linear momentum, chemical species, and energy. The chemical reactions of the model may involve detailed reaction mechanisms for the description of the physicochemical phenomena. One of the biggest challenges is the stiffness of the numerical simulation of these models and the nonlinear nature of species rate of reaction. This work presents a study of in situ adaptive tabulation ISAT technique, focusing on the accuracy, efficiency, and memory usage in the simulation of homogeneous stirred reactor models using simple and complex reaction mechanisms. The combustion of carbon monoxide with oxygen and methane with air mixtures are considered, using detailed reaction mechanisms with 4 and 53 species, 3 and 325 reactions respectively. The results of these simulations indicate that the developed implementation of ISAT technique has a absolute global error smaller than 1%. Moreover, ISAT technique provides gains, in terms of computational time, of up to 80% when compared to the direct integration of the full chemical kinetics. However, in terms of memory usage the present implementation of ISAT technique is found to be excessively demanding.

Keywords : detailed reaction mechanism stirred reactor simulation in situ adaptive tabulation thermochemistry reduction

Author: Americo Cunha Jr - Luís Fernando Figueira da Silva -



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